Commit | Line | Data |
---|---|---|
3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
9b254dd1 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
dba24537 | 56 | |
10568435 JK |
57 | #ifdef HAVE_PERSONALITY |
58 | # include <sys/personality.h> | |
59 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
60 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
61 | # endif | |
62 | #endif /* HAVE_PERSONALITY */ | |
63 | ||
8a77dff3 VP |
64 | /* This comment documents high-level logic of this file. |
65 | ||
66 | Waiting for events in sync mode | |
67 | =============================== | |
68 | ||
69 | When waiting for an event in a specific thread, we just use waitpid, passing | |
70 | the specific pid, and not passing WNOHANG. | |
71 | ||
72 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
73 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
74 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
75 | miss an event. The solution is to use non-blocking waitpid, together with | |
76 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
77 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
78 | flag to check for events in cloned processes. If nothing is found, we use | |
79 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
80 | happened to a child process -- and SIGCHLD will be delivered both for events | |
81 | in main debugged process and in cloned processes. As soon as we know there's | |
82 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
83 | ||
84 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
85 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
86 | blocked, the signal becomes pending and sigsuspend immediately | |
87 | notices it and returns. | |
88 | ||
89 | Waiting for events in async mode | |
90 | ================================ | |
91 | ||
92 | In async mode, GDB should always be ready to handle both user input and target | |
93 | events, so neither blocking waitpid nor sigsuspend are viable | |
94 | options. Instead, we should notify the GDB main event loop whenever there's | |
95 | unprocessed event from the target. The only way to notify this event loop is | |
96 | to make it wait on input from a pipe, and write something to the pipe whenever | |
97 | there's event. Obviously, if we fail to notify the event loop if there's | |
98 | target event, it's bad. If we notify the event loop when there's no event | |
99 | from target, linux-nat.c will detect that there's no event, actually, and | |
100 | report event of type TARGET_WAITKIND_IGNORE, but it will waste time and | |
101 | better avoided. | |
102 | ||
103 | The main design point is that every time GDB is outside linux-nat.c, we have a | |
104 | SIGCHLD handler installed that is called when something happens to the target | |
105 | and notifies the GDB event loop. Also, the event is extracted from the target | |
106 | using waitpid and stored for future use. Whenever GDB core decides to handle | |
107 | the event, and calls into linux-nat.c, we disable SIGCHLD and process things | |
108 | as in sync mode, except that before waitpid call we check if there are any | |
109 | previously read events. | |
110 | ||
111 | It could happen that during event processing, we'll try to get more events | |
112 | than there are events in the local queue, which will result to waitpid call. | |
113 | Those waitpid calls, while blocking, are guarantied to always have | |
114 | something for waitpid to return. E.g., stopping a thread with SIGSTOP, and | |
115 | waiting for the lwp to stop. | |
116 | ||
117 | The event loop is notified about new events using a pipe. SIGCHLD handler does | |
118 | waitpid and writes the results in to a pipe. GDB event loop has the other end | |
119 | of the pipe among the sources. When event loop starts to process the event | |
120 | and calls a function in linux-nat.c, all events from the pipe are transferred | |
121 | into a local queue and SIGCHLD is blocked. Further processing goes as in sync | |
122 | mode. Before we return from linux_nat_wait, we transfer all unprocessed events | |
123 | from local queue back to the pipe, so that when we get back to event loop, | |
124 | event loop will notice there's something more to do. | |
125 | ||
126 | SIGCHLD is blocked when we're inside target_wait, so that should we actually | |
127 | want to wait for some more events, SIGCHLD handler does not steal them from | |
128 | us. Technically, it would be possible to add new events to the local queue but | |
129 | it's about the same amount of work as blocking SIGCHLD. | |
130 | ||
131 | This moving of events from pipe into local queue and back into pipe when we | |
132 | enter/leave linux-nat.c is somewhat ugly. Unfortunately, GDB event loop is | |
133 | home-grown and incapable to wait on any queue. | |
134 | ||
135 | Use of signals | |
136 | ============== | |
137 | ||
138 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
139 | signal is not entirely significant; we just need for a signal to be delivered, | |
140 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
141 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
142 | be queued once; we do not keep track of other sources of SIGSTOP. | |
143 | ||
144 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
145 | use them, because they have special behavior when the signal is generated - | |
146 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
147 | kills the entire thread group. | |
148 | ||
149 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
150 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
151 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
152 | ||
153 | We could use a real-time signal instead. This would solve those problems; we | |
154 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
155 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
156 | generates it, and there are races with trying to find a signal that is not | |
157 | blocked. */ | |
a0ef4274 | 158 | |
dba24537 AC |
159 | #ifndef O_LARGEFILE |
160 | #define O_LARGEFILE 0 | |
161 | #endif | |
0274a8ce | 162 | |
3993f6b1 DJ |
163 | /* If the system headers did not provide the constants, hard-code the normal |
164 | values. */ | |
165 | #ifndef PTRACE_EVENT_FORK | |
166 | ||
167 | #define PTRACE_SETOPTIONS 0x4200 | |
168 | #define PTRACE_GETEVENTMSG 0x4201 | |
169 | ||
170 | /* options set using PTRACE_SETOPTIONS */ | |
171 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
172 | #define PTRACE_O_TRACEFORK 0x00000002 | |
173 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
174 | #define PTRACE_O_TRACECLONE 0x00000008 | |
175 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
176 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
177 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
178 | |
179 | /* Wait extended result codes for the above trace options. */ | |
180 | #define PTRACE_EVENT_FORK 1 | |
181 | #define PTRACE_EVENT_VFORK 2 | |
182 | #define PTRACE_EVENT_CLONE 3 | |
183 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 184 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 185 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
186 | |
187 | #endif /* PTRACE_EVENT_FORK */ | |
188 | ||
189 | /* We can't always assume that this flag is available, but all systems | |
190 | with the ptrace event handlers also have __WALL, so it's safe to use | |
191 | here. */ | |
192 | #ifndef __WALL | |
193 | #define __WALL 0x40000000 /* Wait for any child. */ | |
194 | #endif | |
195 | ||
02d3ff8c UW |
196 | #ifndef PTRACE_GETSIGINFO |
197 | #define PTRACE_GETSIGINFO 0x4202 | |
198 | #endif | |
199 | ||
10d6c8cd DJ |
200 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
201 | the use of the multi-threaded target. */ | |
202 | static struct target_ops *linux_ops; | |
f973ed9c | 203 | static struct target_ops linux_ops_saved; |
10d6c8cd | 204 | |
9f0bdab8 DJ |
205 | /* The method to call, if any, when a new thread is attached. */ |
206 | static void (*linux_nat_new_thread) (ptid_t); | |
207 | ||
ac264b3b MS |
208 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
209 | Called by our to_xfer_partial. */ | |
210 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
211 | enum target_object, | |
212 | const char *, gdb_byte *, | |
213 | const gdb_byte *, | |
10d6c8cd DJ |
214 | ULONGEST, LONGEST); |
215 | ||
d6b0e80f | 216 | static int debug_linux_nat; |
920d2a44 AC |
217 | static void |
218 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
219 | struct cmd_list_element *c, const char *value) | |
220 | { | |
221 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
222 | value); | |
223 | } | |
d6b0e80f | 224 | |
b84876c2 PA |
225 | static int debug_linux_nat_async = 0; |
226 | static void | |
227 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
228 | struct cmd_list_element *c, const char *value) | |
229 | { | |
230 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
231 | value); | |
232 | } | |
233 | ||
10568435 JK |
234 | static int disable_randomization = 1; |
235 | ||
236 | static void | |
237 | show_disable_randomization (struct ui_file *file, int from_tty, | |
238 | struct cmd_list_element *c, const char *value) | |
239 | { | |
240 | #ifdef HAVE_PERSONALITY | |
241 | fprintf_filtered (file, _("\ | |
242 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
243 | value); | |
244 | #else /* !HAVE_PERSONALITY */ | |
245 | fputs_filtered (_("\ | |
246 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
247 | this platform.\n"), file); | |
248 | #endif /* !HAVE_PERSONALITY */ | |
249 | } | |
250 | ||
251 | static void | |
252 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
253 | { | |
254 | #ifndef HAVE_PERSONALITY | |
255 | error (_("\ | |
256 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
257 | this platform.")); | |
258 | #endif /* !HAVE_PERSONALITY */ | |
259 | } | |
260 | ||
9016a515 DJ |
261 | static int linux_parent_pid; |
262 | ||
ae087d01 DJ |
263 | struct simple_pid_list |
264 | { | |
265 | int pid; | |
3d799a95 | 266 | int status; |
ae087d01 DJ |
267 | struct simple_pid_list *next; |
268 | }; | |
269 | struct simple_pid_list *stopped_pids; | |
270 | ||
3993f6b1 DJ |
271 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
272 | can not be used, 1 if it can. */ | |
273 | ||
274 | static int linux_supports_tracefork_flag = -1; | |
275 | ||
9016a515 DJ |
276 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
277 | PTRACE_O_TRACEVFORKDONE. */ | |
278 | ||
279 | static int linux_supports_tracevforkdone_flag = -1; | |
280 | ||
b84876c2 PA |
281 | /* Async mode support */ |
282 | ||
b84876c2 PA |
283 | /* Zero if the async mode, although enabled, is masked, which means |
284 | linux_nat_wait should behave as if async mode was off. */ | |
285 | static int linux_nat_async_mask_value = 1; | |
286 | ||
287 | /* The read/write ends of the pipe registered as waitable file in the | |
288 | event loop. */ | |
289 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
290 | ||
291 | /* Number of queued events in the pipe. */ | |
292 | static volatile int linux_nat_num_queued_events; | |
293 | ||
84e46146 | 294 | /* The possible SIGCHLD handling states. */ |
b84876c2 | 295 | |
84e46146 PA |
296 | enum sigchld_state |
297 | { | |
298 | /* SIGCHLD disabled, with action set to sigchld_handler, for the | |
299 | sigsuspend in linux_nat_wait. */ | |
300 | sigchld_sync, | |
301 | /* SIGCHLD enabled, with action set to async_sigchld_handler. */ | |
302 | sigchld_async, | |
303 | /* Set SIGCHLD to default action. Used while creating an | |
304 | inferior. */ | |
305 | sigchld_default | |
306 | }; | |
307 | ||
308 | /* The current SIGCHLD handling state. */ | |
309 | static enum sigchld_state linux_nat_async_events_state; | |
310 | ||
311 | static enum sigchld_state linux_nat_async_events (enum sigchld_state enable); | |
b84876c2 PA |
312 | static void pipe_to_local_event_queue (void); |
313 | static void local_event_queue_to_pipe (void); | |
314 | static void linux_nat_event_pipe_push (int pid, int status, int options); | |
315 | static int linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options); | |
316 | static void linux_nat_set_async_mode (int on); | |
317 | static void linux_nat_async (void (*callback) | |
318 | (enum inferior_event_type event_type, void *context), | |
319 | void *context); | |
320 | static int linux_nat_async_mask (int mask); | |
a0ef4274 | 321 | static int kill_lwp (int lwpid, int signo); |
b84876c2 | 322 | |
4c28f408 PA |
323 | static int stop_callback (struct lwp_info *lp, void *data); |
324 | ||
b84876c2 PA |
325 | /* Captures the result of a successful waitpid call, along with the |
326 | options used in that call. */ | |
327 | struct waitpid_result | |
328 | { | |
329 | int pid; | |
330 | int status; | |
331 | int options; | |
332 | struct waitpid_result *next; | |
333 | }; | |
334 | ||
335 | /* A singly-linked list of the results of the waitpid calls performed | |
336 | in the async SIGCHLD handler. */ | |
337 | static struct waitpid_result *waitpid_queue = NULL; | |
338 | ||
252fbfc8 PA |
339 | /* Similarly to `waitpid', but check the local event queue instead of |
340 | querying the kernel queue. If PEEK, don't remove the event found | |
341 | from the queue. */ | |
342 | ||
b84876c2 | 343 | static int |
252fbfc8 | 344 | queued_waitpid_1 (int pid, int *status, int flags, int peek) |
b84876c2 PA |
345 | { |
346 | struct waitpid_result *msg = waitpid_queue, *prev = NULL; | |
347 | ||
348 | if (debug_linux_nat_async) | |
349 | fprintf_unfiltered (gdb_stdlog, | |
350 | "\ | |
84e46146 PA |
351 | QWPID: linux_nat_async_events_state(%d), linux_nat_num_queued_events(%d)\n", |
352 | linux_nat_async_events_state, | |
b84876c2 PA |
353 | linux_nat_num_queued_events); |
354 | ||
355 | if (flags & __WALL) | |
356 | { | |
357 | for (; msg; prev = msg, msg = msg->next) | |
358 | if (pid == -1 || pid == msg->pid) | |
359 | break; | |
360 | } | |
361 | else if (flags & __WCLONE) | |
362 | { | |
363 | for (; msg; prev = msg, msg = msg->next) | |
364 | if (msg->options & __WCLONE | |
365 | && (pid == -1 || pid == msg->pid)) | |
366 | break; | |
367 | } | |
368 | else | |
369 | { | |
370 | for (; msg; prev = msg, msg = msg->next) | |
371 | if ((msg->options & __WCLONE) == 0 | |
372 | && (pid == -1 || pid == msg->pid)) | |
373 | break; | |
374 | } | |
375 | ||
376 | if (msg) | |
377 | { | |
378 | int pid; | |
379 | ||
b84876c2 PA |
380 | if (status) |
381 | *status = msg->status; | |
382 | pid = msg->pid; | |
383 | ||
384 | if (debug_linux_nat_async) | |
385 | fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n", | |
386 | pid, msg->status); | |
252fbfc8 PA |
387 | |
388 | if (!peek) | |
389 | { | |
390 | if (prev) | |
391 | prev->next = msg->next; | |
392 | else | |
393 | waitpid_queue = msg->next; | |
394 | ||
395 | msg->next = NULL; | |
396 | xfree (msg); | |
397 | } | |
b84876c2 PA |
398 | |
399 | return pid; | |
400 | } | |
401 | ||
402 | if (debug_linux_nat_async) | |
403 | fprintf_unfiltered (gdb_stdlog, "QWPID: miss\n"); | |
404 | ||
405 | if (status) | |
406 | *status = 0; | |
407 | return -1; | |
408 | } | |
409 | ||
252fbfc8 PA |
410 | /* Similarly to `waitpid', but check the local event queue. */ |
411 | ||
412 | static int | |
413 | queued_waitpid (int pid, int *status, int flags) | |
414 | { | |
415 | return queued_waitpid_1 (pid, status, flags, 0); | |
416 | } | |
417 | ||
b84876c2 PA |
418 | static void |
419 | push_waitpid (int pid, int status, int options) | |
420 | { | |
421 | struct waitpid_result *event, *new_event; | |
422 | ||
423 | new_event = xmalloc (sizeof (*new_event)); | |
424 | new_event->pid = pid; | |
425 | new_event->status = status; | |
426 | new_event->options = options; | |
427 | new_event->next = NULL; | |
428 | ||
429 | if (waitpid_queue) | |
430 | { | |
431 | for (event = waitpid_queue; | |
432 | event && event->next; | |
433 | event = event->next) | |
434 | ; | |
435 | ||
436 | event->next = new_event; | |
437 | } | |
438 | else | |
439 | waitpid_queue = new_event; | |
440 | } | |
441 | ||
710151dd | 442 | /* Drain all queued events of PID. If PID is -1, the effect is of |
b84876c2 PA |
443 | draining all events. */ |
444 | static void | |
445 | drain_queued_events (int pid) | |
446 | { | |
447 | while (queued_waitpid (pid, NULL, __WALL) != -1) | |
448 | ; | |
449 | } | |
450 | ||
ae087d01 DJ |
451 | \f |
452 | /* Trivial list manipulation functions to keep track of a list of | |
453 | new stopped processes. */ | |
454 | static void | |
3d799a95 | 455 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
456 | { |
457 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
458 | new_pid->pid = pid; | |
3d799a95 | 459 | new_pid->status = status; |
ae087d01 DJ |
460 | new_pid->next = *listp; |
461 | *listp = new_pid; | |
462 | } | |
463 | ||
464 | static int | |
3d799a95 | 465 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
466 | { |
467 | struct simple_pid_list **p; | |
468 | ||
469 | for (p = listp; *p != NULL; p = &(*p)->next) | |
470 | if ((*p)->pid == pid) | |
471 | { | |
472 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 473 | *status = (*p)->status; |
ae087d01 DJ |
474 | xfree (*p); |
475 | *p = next; | |
476 | return 1; | |
477 | } | |
478 | return 0; | |
479 | } | |
480 | ||
3d799a95 DJ |
481 | static void |
482 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 483 | { |
3d799a95 | 484 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
485 | } |
486 | ||
3993f6b1 DJ |
487 | \f |
488 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
489 | ||
490 | static void | |
491 | linux_tracefork_child (void) | |
492 | { | |
493 | int ret; | |
494 | ||
495 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
496 | kill (getpid (), SIGSTOP); | |
497 | fork (); | |
48bb3cce | 498 | _exit (0); |
3993f6b1 DJ |
499 | } |
500 | ||
b84876c2 PA |
501 | /* Wrapper function for waitpid which handles EINTR, and checks for |
502 | locally queued events. */ | |
b957e937 DJ |
503 | |
504 | static int | |
505 | my_waitpid (int pid, int *status, int flags) | |
506 | { | |
507 | int ret; | |
b84876c2 PA |
508 | |
509 | /* There should be no concurrent calls to waitpid. */ | |
84e46146 | 510 | gdb_assert (linux_nat_async_events_state == sigchld_sync); |
b84876c2 PA |
511 | |
512 | ret = queued_waitpid (pid, status, flags); | |
513 | if (ret != -1) | |
514 | return ret; | |
515 | ||
b957e937 DJ |
516 | do |
517 | { | |
518 | ret = waitpid (pid, status, flags); | |
519 | } | |
520 | while (ret == -1 && errno == EINTR); | |
521 | ||
522 | return ret; | |
523 | } | |
524 | ||
525 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
526 | ||
527 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
528 | we know that the feature is not available. This may change the tracing | |
529 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
530 | ||
531 | However, if it succeeds, we don't know for sure that the feature is | |
532 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 533 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
534 | fork tracing, and let it fork. If the process exits, we assume that we |
535 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
536 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
537 | |
538 | static void | |
b957e937 | 539 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
540 | { |
541 | int child_pid, ret, status; | |
542 | long second_pid; | |
4c28f408 PA |
543 | enum sigchld_state async_events_original_state; |
544 | ||
545 | async_events_original_state = linux_nat_async_events (sigchld_sync); | |
3993f6b1 | 546 | |
b957e937 DJ |
547 | linux_supports_tracefork_flag = 0; |
548 | linux_supports_tracevforkdone_flag = 0; | |
549 | ||
550 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
551 | if (ret != 0) | |
552 | return; | |
553 | ||
3993f6b1 DJ |
554 | child_pid = fork (); |
555 | if (child_pid == -1) | |
e2e0b3e5 | 556 | perror_with_name (("fork")); |
3993f6b1 DJ |
557 | |
558 | if (child_pid == 0) | |
559 | linux_tracefork_child (); | |
560 | ||
b957e937 | 561 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 562 | if (ret == -1) |
e2e0b3e5 | 563 | perror_with_name (("waitpid")); |
3993f6b1 | 564 | else if (ret != child_pid) |
8a3fe4f8 | 565 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 566 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 567 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 568 | |
3993f6b1 DJ |
569 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
570 | if (ret != 0) | |
571 | { | |
b957e937 DJ |
572 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
573 | if (ret != 0) | |
574 | { | |
8a3fe4f8 | 575 | warning (_("linux_test_for_tracefork: failed to kill child")); |
4c28f408 | 576 | linux_nat_async_events (async_events_original_state); |
b957e937 DJ |
577 | return; |
578 | } | |
579 | ||
580 | ret = my_waitpid (child_pid, &status, 0); | |
581 | if (ret != child_pid) | |
8a3fe4f8 | 582 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 583 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
584 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
585 | "killed child"), status); | |
b957e937 | 586 | |
4c28f408 | 587 | linux_nat_async_events (async_events_original_state); |
3993f6b1 DJ |
588 | return; |
589 | } | |
590 | ||
9016a515 DJ |
591 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
592 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
593 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
594 | linux_supports_tracevforkdone_flag = (ret == 0); | |
595 | ||
b957e937 DJ |
596 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
597 | if (ret != 0) | |
8a3fe4f8 | 598 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
599 | |
600 | ret = my_waitpid (child_pid, &status, 0); | |
601 | ||
3993f6b1 DJ |
602 | if (ret == child_pid && WIFSTOPPED (status) |
603 | && status >> 16 == PTRACE_EVENT_FORK) | |
604 | { | |
605 | second_pid = 0; | |
606 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
607 | if (ret == 0 && second_pid != 0) | |
608 | { | |
609 | int second_status; | |
610 | ||
611 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
612 | my_waitpid (second_pid, &second_status, 0); |
613 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
614 | if (ret != 0) | |
8a3fe4f8 | 615 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 616 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
617 | } |
618 | } | |
b957e937 | 619 | else |
8a3fe4f8 AC |
620 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
621 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 622 | |
b957e937 DJ |
623 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
624 | if (ret != 0) | |
8a3fe4f8 | 625 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 626 | my_waitpid (child_pid, &status, 0); |
4c28f408 PA |
627 | |
628 | linux_nat_async_events (async_events_original_state); | |
3993f6b1 DJ |
629 | } |
630 | ||
631 | /* Return non-zero iff we have tracefork functionality available. | |
632 | This function also sets linux_supports_tracefork_flag. */ | |
633 | ||
634 | static int | |
b957e937 | 635 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
636 | { |
637 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 638 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
639 | return linux_supports_tracefork_flag; |
640 | } | |
641 | ||
9016a515 | 642 | static int |
b957e937 | 643 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
644 | { |
645 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 646 | linux_test_for_tracefork (pid); |
9016a515 DJ |
647 | return linux_supports_tracevforkdone_flag; |
648 | } | |
649 | ||
3993f6b1 | 650 | \f |
4de4c07c DJ |
651 | void |
652 | linux_enable_event_reporting (ptid_t ptid) | |
653 | { | |
d3587048 | 654 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
655 | int options; |
656 | ||
d3587048 DJ |
657 | if (pid == 0) |
658 | pid = ptid_get_pid (ptid); | |
659 | ||
b957e937 | 660 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
661 | return; |
662 | ||
a2f23071 DJ |
663 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
664 | | PTRACE_O_TRACECLONE; | |
b957e937 | 665 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
666 | options |= PTRACE_O_TRACEVFORKDONE; |
667 | ||
668 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
669 | read-only process state. */ | |
4de4c07c DJ |
670 | |
671 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
672 | } | |
673 | ||
6d8fd2b7 UW |
674 | static void |
675 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
676 | { |
677 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 678 | check_for_thread_db (); |
4de4c07c DJ |
679 | } |
680 | ||
10d6c8cd | 681 | static void |
4de4c07c DJ |
682 | linux_child_post_startup_inferior (ptid_t ptid) |
683 | { | |
684 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 685 | check_for_thread_db (); |
4de4c07c DJ |
686 | } |
687 | ||
6d8fd2b7 UW |
688 | static int |
689 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 690 | { |
4de4c07c DJ |
691 | ptid_t last_ptid; |
692 | struct target_waitstatus last_status; | |
9016a515 | 693 | int has_vforked; |
4de4c07c DJ |
694 | int parent_pid, child_pid; |
695 | ||
b84876c2 PA |
696 | if (target_can_async_p ()) |
697 | target_async (NULL, 0); | |
698 | ||
4de4c07c | 699 | get_last_target_status (&last_ptid, &last_status); |
9016a515 | 700 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
701 | parent_pid = ptid_get_lwp (last_ptid); |
702 | if (parent_pid == 0) | |
703 | parent_pid = ptid_get_pid (last_ptid); | |
3a3e9ee3 | 704 | child_pid = PIDGET (last_status.value.related_pid); |
4de4c07c DJ |
705 | |
706 | if (! follow_child) | |
707 | { | |
708 | /* We're already attached to the parent, by default. */ | |
709 | ||
710 | /* Before detaching from the child, remove all breakpoints from | |
711 | it. (This won't actually modify the breakpoint list, but will | |
712 | physically remove the breakpoints from the child.) */ | |
9016a515 DJ |
713 | /* If we vforked this will remove the breakpoints from the parent |
714 | also, but they'll be reinserted below. */ | |
4de4c07c DJ |
715 | detach_breakpoints (child_pid); |
716 | ||
ac264b3b MS |
717 | /* Detach new forked process? */ |
718 | if (detach_fork) | |
f75c00e4 | 719 | { |
e85a822c | 720 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
721 | { |
722 | target_terminal_ours (); | |
723 | fprintf_filtered (gdb_stdlog, | |
724 | "Detaching after fork from child process %d.\n", | |
725 | child_pid); | |
726 | } | |
4de4c07c | 727 | |
ac264b3b MS |
728 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
729 | } | |
730 | else | |
731 | { | |
732 | struct fork_info *fp; | |
7f9f62ba PA |
733 | |
734 | /* Add process to GDB's tables. */ | |
735 | add_inferior (child_pid); | |
736 | ||
ac264b3b MS |
737 | /* Retain child fork in ptrace (stopped) state. */ |
738 | fp = find_fork_pid (child_pid); | |
739 | if (!fp) | |
740 | fp = add_fork (child_pid); | |
741 | fork_save_infrun_state (fp, 0); | |
742 | } | |
9016a515 DJ |
743 | |
744 | if (has_vforked) | |
745 | { | |
b957e937 DJ |
746 | gdb_assert (linux_supports_tracefork_flag >= 0); |
747 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
748 | { |
749 | int status; | |
750 | ||
751 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 752 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 753 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
754 | warning (_("Unexpected waitpid result %06x when waiting for " |
755 | "vfork-done"), status); | |
9016a515 DJ |
756 | } |
757 | else | |
758 | { | |
759 | /* We can't insert breakpoints until the child has | |
760 | finished with the shared memory region. We need to | |
761 | wait until that happens. Ideal would be to just | |
762 | call: | |
763 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
764 | - waitpid (parent_pid, &status, __WALL); | |
765 | However, most architectures can't handle a syscall | |
766 | being traced on the way out if it wasn't traced on | |
767 | the way in. | |
768 | ||
769 | We might also think to loop, continuing the child | |
770 | until it exits or gets a SIGTRAP. One problem is | |
771 | that the child might call ptrace with PTRACE_TRACEME. | |
772 | ||
773 | There's no simple and reliable way to figure out when | |
774 | the vforked child will be done with its copy of the | |
775 | shared memory. We could step it out of the syscall, | |
776 | two instructions, let it go, and then single-step the | |
777 | parent once. When we have hardware single-step, this | |
778 | would work; with software single-step it could still | |
779 | be made to work but we'd have to be able to insert | |
780 | single-step breakpoints in the child, and we'd have | |
781 | to insert -just- the single-step breakpoint in the | |
782 | parent. Very awkward. | |
783 | ||
784 | In the end, the best we can do is to make sure it | |
785 | runs for a little while. Hopefully it will be out of | |
786 | range of any breakpoints we reinsert. Usually this | |
787 | is only the single-step breakpoint at vfork's return | |
788 | point. */ | |
789 | ||
790 | usleep (10000); | |
791 | } | |
792 | ||
793 | /* Since we vforked, breakpoints were removed in the parent | |
794 | too. Put them back. */ | |
795 | reattach_breakpoints (parent_pid); | |
796 | } | |
4de4c07c | 797 | } |
3993f6b1 | 798 | else |
4de4c07c | 799 | { |
4e1c45ea PA |
800 | struct thread_info *last_tp = find_thread_pid (last_ptid); |
801 | struct thread_info *tp; | |
4de4c07c DJ |
802 | char child_pid_spelling[40]; |
803 | ||
4e1c45ea PA |
804 | /* Copy user stepping state to the new inferior thread. */ |
805 | struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint; | |
806 | CORE_ADDR step_range_start = last_tp->step_range_start; | |
807 | CORE_ADDR step_range_end = last_tp->step_range_end; | |
808 | struct frame_id step_frame_id = last_tp->step_frame_id; | |
809 | ||
810 | /* Otherwise, deleting the parent would get rid of this | |
811 | breakpoint. */ | |
812 | last_tp->step_resume_breakpoint = NULL; | |
813 | ||
4de4c07c | 814 | /* Needed to keep the breakpoint lists in sync. */ |
9016a515 DJ |
815 | if (! has_vforked) |
816 | detach_breakpoints (child_pid); | |
4de4c07c DJ |
817 | |
818 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
819 | remove_breakpoints (); | |
820 | ||
e85a822c | 821 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
822 | { |
823 | target_terminal_ours (); | |
ac264b3b MS |
824 | fprintf_filtered (gdb_stdlog, |
825 | "Attaching after fork to child process %d.\n", | |
826 | child_pid); | |
f75c00e4 | 827 | } |
4de4c07c | 828 | |
9016a515 DJ |
829 | /* If we're vforking, we may want to hold on to the parent until |
830 | the child exits or execs. At exec time we can remove the old | |
831 | breakpoints from the parent and detach it; at exit time we | |
832 | could do the same (or even, sneakily, resume debugging it - the | |
833 | child's exec has failed, or something similar). | |
834 | ||
835 | This doesn't clean up "properly", because we can't call | |
836 | target_detach, but that's OK; if the current target is "child", | |
837 | then it doesn't need any further cleanups, and lin_lwp will | |
838 | generally not encounter vfork (vfork is defined to fork | |
839 | in libpthread.so). | |
840 | ||
841 | The holding part is very easy if we have VFORKDONE events; | |
842 | but keeping track of both processes is beyond GDB at the | |
843 | moment. So we don't expose the parent to the rest of GDB. | |
844 | Instead we quietly hold onto it until such time as we can | |
845 | safely resume it. */ | |
846 | ||
847 | if (has_vforked) | |
7f9f62ba PA |
848 | { |
849 | linux_parent_pid = parent_pid; | |
850 | detach_inferior (parent_pid); | |
851 | } | |
ac264b3b MS |
852 | else if (!detach_fork) |
853 | { | |
854 | struct fork_info *fp; | |
855 | /* Retain parent fork in ptrace (stopped) state. */ | |
856 | fp = find_fork_pid (parent_pid); | |
857 | if (!fp) | |
858 | fp = add_fork (parent_pid); | |
859 | fork_save_infrun_state (fp, 0); | |
860 | } | |
9016a515 | 861 | else |
b84876c2 | 862 | target_detach (NULL, 0); |
4de4c07c | 863 | |
9f0bdab8 | 864 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
7f9f62ba | 865 | add_inferior (child_pid); |
ee057212 DJ |
866 | |
867 | /* Reinstall ourselves, since we might have been removed in | |
868 | target_detach (which does other necessary cleanup). */ | |
ac264b3b | 869 | |
ee057212 | 870 | push_target (ops); |
9f0bdab8 | 871 | linux_nat_switch_fork (inferior_ptid); |
ef29ce1a | 872 | check_for_thread_db (); |
4de4c07c | 873 | |
4e1c45ea PA |
874 | tp = inferior_thread (); |
875 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
876 | tp->step_range_start = step_range_start; | |
877 | tp->step_range_end = step_range_end; | |
878 | tp->step_frame_id = step_frame_id; | |
879 | ||
4de4c07c DJ |
880 | /* Reset breakpoints in the child as appropriate. */ |
881 | follow_inferior_reset_breakpoints (); | |
882 | } | |
883 | ||
b84876c2 PA |
884 | if (target_can_async_p ()) |
885 | target_async (inferior_event_handler, 0); | |
886 | ||
4de4c07c DJ |
887 | return 0; |
888 | } | |
889 | ||
4de4c07c | 890 | \f |
6d8fd2b7 UW |
891 | static void |
892 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 893 | { |
b957e937 | 894 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 895 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
896 | } |
897 | ||
6d8fd2b7 UW |
898 | static void |
899 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 900 | { |
b957e937 | 901 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 902 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
903 | } |
904 | ||
6d8fd2b7 UW |
905 | static void |
906 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 907 | { |
b957e937 | 908 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 909 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
910 | } |
911 | ||
d6b0e80f AC |
912 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
913 | are processes sharing the same VM space. A multi-threaded process | |
914 | is basically a group of such processes. However, such a grouping | |
915 | is almost entirely a user-space issue; the kernel doesn't enforce | |
916 | such a grouping at all (this might change in the future). In | |
917 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
918 | Threads library) to provide such a grouping. | |
919 | ||
920 | It is perfectly well possible to write a multi-threaded application | |
921 | without the assistance of a threads library, by using the clone | |
922 | system call directly. This module should be able to give some | |
923 | rudimentary support for debugging such applications if developers | |
924 | specify the CLONE_PTRACE flag in the clone system call, and are | |
925 | using the Linux kernel 2.4 or above. | |
926 | ||
927 | Note that there are some peculiarities in GNU/Linux that affect | |
928 | this code: | |
929 | ||
930 | - In general one should specify the __WCLONE flag to waitpid in | |
931 | order to make it report events for any of the cloned processes | |
932 | (and leave it out for the initial process). However, if a cloned | |
933 | process has exited the exit status is only reported if the | |
934 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
935 | we cannot use it since GDB must work on older systems too. | |
936 | ||
937 | - When a traced, cloned process exits and is waited for by the | |
938 | debugger, the kernel reassigns it to the original parent and | |
939 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
940 | library doesn't notice this, which leads to the "zombie problem": | |
941 | When debugged a multi-threaded process that spawns a lot of | |
942 | threads will run out of processes, even if the threads exit, | |
943 | because the "zombies" stay around. */ | |
944 | ||
945 | /* List of known LWPs. */ | |
9f0bdab8 | 946 | struct lwp_info *lwp_list; |
d6b0e80f AC |
947 | |
948 | /* Number of LWPs in the list. */ | |
949 | static int num_lwps; | |
d6b0e80f AC |
950 | \f |
951 | ||
d6b0e80f AC |
952 | /* Original signal mask. */ |
953 | static sigset_t normal_mask; | |
954 | ||
955 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
956 | _initialize_linux_nat. */ | |
957 | static sigset_t suspend_mask; | |
958 | ||
b84876c2 PA |
959 | /* SIGCHLD action for synchronous mode. */ |
960 | struct sigaction sync_sigchld_action; | |
961 | ||
962 | /* SIGCHLD action for asynchronous mode. */ | |
963 | static struct sigaction async_sigchld_action; | |
84e46146 PA |
964 | |
965 | /* SIGCHLD default action, to pass to new inferiors. */ | |
966 | static struct sigaction sigchld_default_action; | |
d6b0e80f AC |
967 | \f |
968 | ||
969 | /* Prototypes for local functions. */ | |
970 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
971 | static int linux_nat_thread_alive (ptid_t ptid); | |
6d8fd2b7 | 972 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
973 | static int cancel_breakpoint (struct lwp_info *lp); |
974 | ||
d6b0e80f AC |
975 | \f |
976 | /* Convert wait status STATUS to a string. Used for printing debug | |
977 | messages only. */ | |
978 | ||
979 | static char * | |
980 | status_to_str (int status) | |
981 | { | |
982 | static char buf[64]; | |
983 | ||
984 | if (WIFSTOPPED (status)) | |
985 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
986 | strsignal (WSTOPSIG (status))); | |
987 | else if (WIFSIGNALED (status)) | |
988 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
989 | strsignal (WSTOPSIG (status))); | |
990 | else | |
991 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
992 | ||
993 | return buf; | |
994 | } | |
995 | ||
996 | /* Initialize the list of LWPs. Note that this module, contrary to | |
997 | what GDB's generic threads layer does for its thread list, | |
998 | re-initializes the LWP lists whenever we mourn or detach (which | |
999 | doesn't involve mourning) the inferior. */ | |
1000 | ||
1001 | static void | |
1002 | init_lwp_list (void) | |
1003 | { | |
1004 | struct lwp_info *lp, *lpnext; | |
1005 | ||
1006 | for (lp = lwp_list; lp; lp = lpnext) | |
1007 | { | |
1008 | lpnext = lp->next; | |
1009 | xfree (lp); | |
1010 | } | |
1011 | ||
1012 | lwp_list = NULL; | |
1013 | num_lwps = 0; | |
d6b0e80f AC |
1014 | } |
1015 | ||
f973ed9c | 1016 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1017 | structure describing the new LWP. The LWP should already be stopped |
1018 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1019 | |
1020 | static struct lwp_info * | |
1021 | add_lwp (ptid_t ptid) | |
1022 | { | |
1023 | struct lwp_info *lp; | |
1024 | ||
1025 | gdb_assert (is_lwp (ptid)); | |
1026 | ||
1027 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1028 | ||
1029 | memset (lp, 0, sizeof (struct lwp_info)); | |
1030 | ||
1031 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1032 | ||
1033 | lp->ptid = ptid; | |
1034 | ||
1035 | lp->next = lwp_list; | |
1036 | lwp_list = lp; | |
f973ed9c | 1037 | ++num_lwps; |
d6b0e80f | 1038 | |
9f0bdab8 DJ |
1039 | if (num_lwps > 1 && linux_nat_new_thread != NULL) |
1040 | linux_nat_new_thread (ptid); | |
1041 | ||
d6b0e80f AC |
1042 | return lp; |
1043 | } | |
1044 | ||
1045 | /* Remove the LWP specified by PID from the list. */ | |
1046 | ||
1047 | static void | |
1048 | delete_lwp (ptid_t ptid) | |
1049 | { | |
1050 | struct lwp_info *lp, *lpprev; | |
1051 | ||
1052 | lpprev = NULL; | |
1053 | ||
1054 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1055 | if (ptid_equal (lp->ptid, ptid)) | |
1056 | break; | |
1057 | ||
1058 | if (!lp) | |
1059 | return; | |
1060 | ||
d6b0e80f AC |
1061 | num_lwps--; |
1062 | ||
1063 | if (lpprev) | |
1064 | lpprev->next = lp->next; | |
1065 | else | |
1066 | lwp_list = lp->next; | |
1067 | ||
1068 | xfree (lp); | |
1069 | } | |
1070 | ||
1071 | /* Return a pointer to the structure describing the LWP corresponding | |
1072 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1073 | ||
1074 | static struct lwp_info * | |
1075 | find_lwp_pid (ptid_t ptid) | |
1076 | { | |
1077 | struct lwp_info *lp; | |
1078 | int lwp; | |
1079 | ||
1080 | if (is_lwp (ptid)) | |
1081 | lwp = GET_LWP (ptid); | |
1082 | else | |
1083 | lwp = GET_PID (ptid); | |
1084 | ||
1085 | for (lp = lwp_list; lp; lp = lp->next) | |
1086 | if (lwp == GET_LWP (lp->ptid)) | |
1087 | return lp; | |
1088 | ||
1089 | return NULL; | |
1090 | } | |
1091 | ||
1092 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1093 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1094 | pointer to the structure describing that LWP immediately. | |
1095 | Otherwise return NULL. */ | |
1096 | ||
1097 | struct lwp_info * | |
1098 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
1099 | { | |
1100 | struct lwp_info *lp, *lpnext; | |
1101 | ||
1102 | for (lp = lwp_list; lp; lp = lpnext) | |
1103 | { | |
1104 | lpnext = lp->next; | |
1105 | if ((*callback) (lp, data)) | |
1106 | return lp; | |
1107 | } | |
1108 | ||
1109 | return NULL; | |
1110 | } | |
1111 | ||
f973ed9c DJ |
1112 | /* Update our internal state when changing from one fork (checkpoint, |
1113 | et cetera) to another indicated by NEW_PTID. We can only switch | |
1114 | single-threaded applications, so we only create one new LWP, and | |
1115 | the previous list is discarded. */ | |
1116 | ||
1117 | void | |
1118 | linux_nat_switch_fork (ptid_t new_ptid) | |
1119 | { | |
1120 | struct lwp_info *lp; | |
1121 | ||
1122 | init_lwp_list (); | |
1123 | lp = add_lwp (new_ptid); | |
1124 | lp->stopped = 1; | |
e26af52f | 1125 | |
4f8d22e3 PA |
1126 | init_thread_list (); |
1127 | add_thread_silent (new_ptid); | |
e26af52f DJ |
1128 | } |
1129 | ||
e26af52f DJ |
1130 | /* Handle the exit of a single thread LP. */ |
1131 | ||
1132 | static void | |
1133 | exit_lwp (struct lwp_info *lp) | |
1134 | { | |
063bfe2e VP |
1135 | struct thread_info *th = find_thread_pid (lp->ptid); |
1136 | ||
1137 | if (th) | |
e26af52f | 1138 | { |
17faa917 DJ |
1139 | if (print_thread_events) |
1140 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1141 | ||
4f8d22e3 | 1142 | delete_thread (lp->ptid); |
e26af52f DJ |
1143 | } |
1144 | ||
1145 | delete_lwp (lp->ptid); | |
1146 | } | |
1147 | ||
a0ef4274 DJ |
1148 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1149 | Other states including `T (tracing stop)' are reported as false. */ | |
1150 | ||
1151 | static int | |
1152 | pid_is_stopped (pid_t pid) | |
1153 | { | |
1154 | FILE *status_file; | |
1155 | char buf[100]; | |
1156 | int retval = 0; | |
1157 | ||
1158 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1159 | status_file = fopen (buf, "r"); | |
1160 | if (status_file != NULL) | |
1161 | { | |
1162 | int have_state = 0; | |
1163 | ||
1164 | while (fgets (buf, sizeof (buf), status_file)) | |
1165 | { | |
1166 | if (strncmp (buf, "State:", 6) == 0) | |
1167 | { | |
1168 | have_state = 1; | |
1169 | break; | |
1170 | } | |
1171 | } | |
1172 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1173 | retval = 1; | |
1174 | fclose (status_file); | |
1175 | } | |
1176 | return retval; | |
1177 | } | |
1178 | ||
1179 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1180 | Returns a wait status for that LWP, to cache. */ | |
1181 | ||
1182 | static int | |
1183 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1184 | int *signalled) | |
1185 | { | |
1186 | pid_t new_pid, pid = GET_LWP (ptid); | |
1187 | int status; | |
1188 | ||
1189 | if (pid_is_stopped (pid)) | |
1190 | { | |
1191 | if (debug_linux_nat) | |
1192 | fprintf_unfiltered (gdb_stdlog, | |
1193 | "LNPAW: Attaching to a stopped process\n"); | |
1194 | ||
1195 | /* The process is definitely stopped. It is in a job control | |
1196 | stop, unless the kernel predates the TASK_STOPPED / | |
1197 | TASK_TRACED distinction, in which case it might be in a | |
1198 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1199 | can kill it, signal it, et cetera. | |
1200 | ||
1201 | First make sure there is a pending SIGSTOP. Since we are | |
1202 | already attached, the process can not transition from stopped | |
1203 | to running without a PTRACE_CONT; so we know this signal will | |
1204 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1205 | probably already in the queue (unless this kernel is old | |
1206 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1207 | is not an RT signal, it can only be queued once. */ | |
1208 | kill_lwp (pid, SIGSTOP); | |
1209 | ||
1210 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1211 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1212 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1213 | } | |
1214 | ||
1215 | /* Make sure the initial process is stopped. The user-level threads | |
1216 | layer might want to poke around in the inferior, and that won't | |
1217 | work if things haven't stabilized yet. */ | |
1218 | new_pid = my_waitpid (pid, &status, 0); | |
1219 | if (new_pid == -1 && errno == ECHILD) | |
1220 | { | |
1221 | if (first) | |
1222 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1223 | ||
1224 | /* Try again with __WCLONE to check cloned processes. */ | |
1225 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1226 | *cloned = 1; | |
1227 | } | |
1228 | ||
1229 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1230 | ||
1231 | if (WSTOPSIG (status) != SIGSTOP) | |
1232 | { | |
1233 | *signalled = 1; | |
1234 | if (debug_linux_nat) | |
1235 | fprintf_unfiltered (gdb_stdlog, | |
1236 | "LNPAW: Received %s after attaching\n", | |
1237 | status_to_str (status)); | |
1238 | } | |
1239 | ||
1240 | return status; | |
1241 | } | |
1242 | ||
1243 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1244 | if the new LWP could not be attached. */ | |
d6b0e80f | 1245 | |
9ee57c33 | 1246 | int |
93815fbf | 1247 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1248 | { |
9ee57c33 | 1249 | struct lwp_info *lp; |
84e46146 | 1250 | enum sigchld_state async_events_original_state; |
d6b0e80f AC |
1251 | |
1252 | gdb_assert (is_lwp (ptid)); | |
1253 | ||
84e46146 | 1254 | async_events_original_state = linux_nat_async_events (sigchld_sync); |
d6b0e80f | 1255 | |
9ee57c33 | 1256 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1257 | |
1258 | /* We assume that we're already attached to any LWP that has an id | |
1259 | equal to the overall process id, and to any LWP that is already | |
1260 | in our list of LWPs. If we're not seeing exit events from threads | |
1261 | and we've had PID wraparound since we last tried to stop all threads, | |
1262 | this assumption might be wrong; fortunately, this is very unlikely | |
1263 | to happen. */ | |
9ee57c33 | 1264 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1265 | { |
a0ef4274 | 1266 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1267 | |
1268 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1269 | { |
1270 | /* If we fail to attach to the thread, issue a warning, | |
1271 | but continue. One way this can happen is if thread | |
e9efe249 | 1272 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1273 | bug may place threads in the thread list and then fail |
1274 | to create them. */ | |
1275 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1276 | safe_strerror (errno)); | |
1277 | return -1; | |
1278 | } | |
1279 | ||
d6b0e80f AC |
1280 | if (debug_linux_nat) |
1281 | fprintf_unfiltered (gdb_stdlog, | |
1282 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1283 | target_pid_to_str (ptid)); | |
1284 | ||
a0ef4274 DJ |
1285 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1286 | lp = add_lwp (ptid); | |
1287 | lp->stopped = 1; | |
1288 | lp->cloned = cloned; | |
1289 | lp->signalled = signalled; | |
1290 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1291 | { |
a0ef4274 DJ |
1292 | lp->resumed = 1; |
1293 | lp->status = status; | |
d6b0e80f AC |
1294 | } |
1295 | ||
a0ef4274 | 1296 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1297 | |
1298 | if (debug_linux_nat) | |
1299 | { | |
1300 | fprintf_unfiltered (gdb_stdlog, | |
1301 | "LLAL: waitpid %s received %s\n", | |
1302 | target_pid_to_str (ptid), | |
1303 | status_to_str (status)); | |
1304 | } | |
1305 | } | |
1306 | else | |
1307 | { | |
1308 | /* We assume that the LWP representing the original process is | |
1309 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1310 | that the GNU/linux ptrace layer uses to keep track of |
1311 | threads. Note that this won't have already been done since | |
1312 | the main thread will have, we assume, been stopped by an | |
1313 | attach from a different layer. */ | |
9ee57c33 DJ |
1314 | if (lp == NULL) |
1315 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1316 | lp->stopped = 1; |
1317 | } | |
9ee57c33 | 1318 | |
84e46146 | 1319 | linux_nat_async_events (async_events_original_state); |
9ee57c33 | 1320 | return 0; |
d6b0e80f AC |
1321 | } |
1322 | ||
b84876c2 | 1323 | static void |
136d6dae VP |
1324 | linux_nat_create_inferior (struct target_ops *ops, |
1325 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1326 | int from_tty) |
1327 | { | |
1328 | int saved_async = 0; | |
10568435 JK |
1329 | #ifdef HAVE_PERSONALITY |
1330 | int personality_orig = 0, personality_set = 0; | |
1331 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1332 | |
1333 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1334 | we have to mask the async mode. */ | |
1335 | ||
1336 | if (target_can_async_p ()) | |
84e46146 PA |
1337 | /* Mask async mode. Creating a child requires a loop calling |
1338 | wait_for_inferior currently. */ | |
b84876c2 PA |
1339 | saved_async = linux_nat_async_mask (0); |
1340 | else | |
1341 | { | |
1342 | /* Restore the original signal mask. */ | |
1343 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1344 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
1345 | suspend_mask = normal_mask; | |
1346 | sigdelset (&suspend_mask, SIGCHLD); | |
1347 | } | |
1348 | ||
84e46146 PA |
1349 | /* Set SIGCHLD to the default action, until after execing the child, |
1350 | since the inferior inherits the superior's signal mask. It will | |
1351 | be blocked again in linux_nat_wait, which is only reached after | |
1352 | the inferior execing. */ | |
1353 | linux_nat_async_events (sigchld_default); | |
1354 | ||
10568435 JK |
1355 | #ifdef HAVE_PERSONALITY |
1356 | if (disable_randomization) | |
1357 | { | |
1358 | errno = 0; | |
1359 | personality_orig = personality (0xffffffff); | |
1360 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1361 | { | |
1362 | personality_set = 1; | |
1363 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1364 | } | |
1365 | if (errno != 0 || (personality_set | |
1366 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1367 | warning (_("Error disabling address space randomization: %s"), | |
1368 | safe_strerror (errno)); | |
1369 | } | |
1370 | #endif /* HAVE_PERSONALITY */ | |
1371 | ||
136d6dae | 1372 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1373 | |
10568435 JK |
1374 | #ifdef HAVE_PERSONALITY |
1375 | if (personality_set) | |
1376 | { | |
1377 | errno = 0; | |
1378 | personality (personality_orig); | |
1379 | if (errno != 0) | |
1380 | warning (_("Error restoring address space randomization: %s"), | |
1381 | safe_strerror (errno)); | |
1382 | } | |
1383 | #endif /* HAVE_PERSONALITY */ | |
1384 | ||
b84876c2 PA |
1385 | if (saved_async) |
1386 | linux_nat_async_mask (saved_async); | |
1387 | } | |
1388 | ||
d6b0e80f | 1389 | static void |
136d6dae | 1390 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1391 | { |
1392 | struct lwp_info *lp; | |
d6b0e80f | 1393 | int status; |
af990527 | 1394 | ptid_t ptid; |
d6b0e80f AC |
1395 | |
1396 | /* FIXME: We should probably accept a list of process id's, and | |
1397 | attach all of them. */ | |
136d6dae | 1398 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1399 | |
b84876c2 PA |
1400 | if (!target_can_async_p ()) |
1401 | { | |
1402 | /* Restore the original signal mask. */ | |
1403 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1404 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
1405 | suspend_mask = normal_mask; | |
1406 | sigdelset (&suspend_mask, SIGCHLD); | |
1407 | } | |
1408 | ||
af990527 PA |
1409 | /* The ptrace base target adds the main thread with (pid,0,0) |
1410 | format. Decorate it with lwp info. */ | |
1411 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1412 | thread_change_ptid (inferior_ptid, ptid); | |
1413 | ||
9f0bdab8 | 1414 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1415 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1416 | |
1417 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1418 | &lp->signalled); | |
1419 | lp->stopped = 1; | |
9f0bdab8 | 1420 | |
a0ef4274 | 1421 | /* Save the wait status to report later. */ |
d6b0e80f | 1422 | lp->resumed = 1; |
a0ef4274 DJ |
1423 | if (debug_linux_nat) |
1424 | fprintf_unfiltered (gdb_stdlog, | |
1425 | "LNA: waitpid %ld, saving status %s\n", | |
1426 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd PA |
1427 | |
1428 | if (!target_can_async_p ()) | |
a0ef4274 | 1429 | lp->status = status; |
710151dd PA |
1430 | else |
1431 | { | |
1432 | /* We already waited for this LWP, so put the wait result on the | |
1433 | pipe. The event loop will wake up and gets us to handling | |
1434 | this event. */ | |
a0ef4274 DJ |
1435 | linux_nat_event_pipe_push (GET_PID (lp->ptid), status, |
1436 | lp->cloned ? __WCLONE : 0); | |
b84876c2 PA |
1437 | /* Register in the event loop. */ |
1438 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1439 | } |
1440 | } | |
1441 | ||
a0ef4274 DJ |
1442 | /* Get pending status of LP. */ |
1443 | static int | |
1444 | get_pending_status (struct lwp_info *lp, int *status) | |
1445 | { | |
1446 | struct target_waitstatus last; | |
1447 | ptid_t last_ptid; | |
1448 | ||
1449 | get_last_target_status (&last_ptid, &last); | |
1450 | ||
1451 | /* If this lwp is the ptid that GDB is processing an event from, the | |
1452 | signal will be in stop_signal. Otherwise, in all-stop + sync | |
1453 | mode, we may cache pending events in lp->status while trying to | |
1454 | stop all threads (see stop_wait_callback). In async mode, the | |
1455 | events are always cached in waitpid_queue. */ | |
1456 | ||
1457 | *status = 0; | |
4c28f408 PA |
1458 | |
1459 | if (non_stop) | |
a0ef4274 | 1460 | { |
4c28f408 PA |
1461 | enum target_signal signo = TARGET_SIGNAL_0; |
1462 | ||
1463 | if (is_executing (lp->ptid)) | |
1464 | { | |
1465 | /* If the core thought this lwp was executing --- e.g., the | |
1466 | executing property hasn't been updated yet, but the | |
1467 | thread has been stopped with a stop_callback / | |
1468 | stop_wait_callback sequence (see linux_nat_detach for | |
1469 | example) --- we can only have pending events in the local | |
1470 | queue. */ | |
1471 | if (queued_waitpid (GET_LWP (lp->ptid), status, __WALL) != -1) | |
1472 | { | |
8b8655b3 TJB |
1473 | if (WIFSTOPPED (*status)) |
1474 | signo = target_signal_from_host (WSTOPSIG (*status)); | |
4c28f408 PA |
1475 | |
1476 | /* If not stopped, then the lwp is gone, no use in | |
1477 | resending a signal. */ | |
1478 | } | |
1479 | } | |
1480 | else | |
1481 | { | |
1482 | /* If the core knows the thread is not executing, then we | |
1483 | have the last signal recorded in | |
2020b7ab | 1484 | thread_info->stop_signal. */ |
4c28f408 | 1485 | |
2020b7ab PA |
1486 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1487 | signo = tp->stop_signal; | |
4c28f408 PA |
1488 | } |
1489 | ||
1490 | if (signo != TARGET_SIGNAL_0 | |
1491 | && !signal_pass_state (signo)) | |
1492 | { | |
1493 | if (debug_linux_nat) | |
1494 | fprintf_unfiltered (gdb_stdlog, "\ | |
1495 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1496 | target_pid_to_str (lp->ptid), | |
1497 | target_signal_to_string (signo)); | |
1498 | } | |
1499 | else | |
1500 | { | |
1501 | if (signo != TARGET_SIGNAL_0) | |
1502 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1503 | ||
1504 | if (debug_linux_nat) | |
1505 | fprintf_unfiltered (gdb_stdlog, | |
1506 | "GPT: lwp %s as pending signal %s\n", | |
1507 | target_pid_to_str (lp->ptid), | |
1508 | target_signal_to_string (signo)); | |
1509 | } | |
a0ef4274 | 1510 | } |
a0ef4274 | 1511 | else |
4c28f408 PA |
1512 | { |
1513 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1514 | { | |
2020b7ab PA |
1515 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1516 | if (tp->stop_signal != TARGET_SIGNAL_0 | |
1517 | && signal_pass_state (tp->stop_signal)) | |
1518 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 PA |
1519 | } |
1520 | else if (target_can_async_p ()) | |
1521 | queued_waitpid (GET_LWP (lp->ptid), status, __WALL); | |
1522 | else | |
1523 | *status = lp->status; | |
1524 | } | |
a0ef4274 DJ |
1525 | |
1526 | return 0; | |
1527 | } | |
1528 | ||
d6b0e80f AC |
1529 | static int |
1530 | detach_callback (struct lwp_info *lp, void *data) | |
1531 | { | |
1532 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1533 | ||
1534 | if (debug_linux_nat && lp->status) | |
1535 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1536 | strsignal (WSTOPSIG (lp->status)), | |
1537 | target_pid_to_str (lp->ptid)); | |
1538 | ||
a0ef4274 DJ |
1539 | /* If there is a pending SIGSTOP, get rid of it. */ |
1540 | if (lp->signalled) | |
d6b0e80f | 1541 | { |
d6b0e80f AC |
1542 | if (debug_linux_nat) |
1543 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1544 | "DC: Sending SIGCONT to %s\n", |
1545 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1546 | |
a0ef4274 | 1547 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1548 | lp->signalled = 0; |
d6b0e80f AC |
1549 | } |
1550 | ||
1551 | /* We don't actually detach from the LWP that has an id equal to the | |
1552 | overall process id just yet. */ | |
1553 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1554 | { | |
a0ef4274 DJ |
1555 | int status = 0; |
1556 | ||
1557 | /* Pass on any pending signal for this LWP. */ | |
1558 | get_pending_status (lp, &status); | |
1559 | ||
d6b0e80f AC |
1560 | errno = 0; |
1561 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1562 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1563 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1564 | safe_strerror (errno)); |
1565 | ||
1566 | if (debug_linux_nat) | |
1567 | fprintf_unfiltered (gdb_stdlog, | |
1568 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1569 | target_pid_to_str (lp->ptid), | |
1570 | strsignal (WSTOPSIG (lp->status))); | |
1571 | ||
1572 | delete_lwp (lp->ptid); | |
1573 | } | |
1574 | ||
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | static void | |
136d6dae | 1579 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1580 | { |
b84876c2 | 1581 | int pid; |
a0ef4274 DJ |
1582 | int status; |
1583 | enum target_signal sig; | |
1584 | ||
b84876c2 PA |
1585 | if (target_can_async_p ()) |
1586 | linux_nat_async (NULL, 0); | |
1587 | ||
4c28f408 PA |
1588 | /* Stop all threads before detaching. ptrace requires that the |
1589 | thread is stopped to sucessfully detach. */ | |
1590 | iterate_over_lwps (stop_callback, NULL); | |
1591 | /* ... and wait until all of them have reported back that | |
1592 | they're no longer running. */ | |
1593 | iterate_over_lwps (stop_wait_callback, NULL); | |
1594 | ||
d6b0e80f AC |
1595 | iterate_over_lwps (detach_callback, NULL); |
1596 | ||
1597 | /* Only the initial process should be left right now. */ | |
1598 | gdb_assert (num_lwps == 1); | |
1599 | ||
a0ef4274 DJ |
1600 | /* Pass on any pending signal for the last LWP. */ |
1601 | if ((args == NULL || *args == '\0') | |
1602 | && get_pending_status (lwp_list, &status) != -1 | |
1603 | && WIFSTOPPED (status)) | |
1604 | { | |
1605 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1606 | pass it along with PTRACE_DETACH. */ | |
1607 | args = alloca (8); | |
1608 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1609 | fprintf_unfiltered (gdb_stdlog, | |
1610 | "LND: Sending signal %s to %s\n", | |
1611 | args, | |
1612 | target_pid_to_str (lwp_list->ptid)); | |
1613 | } | |
1614 | ||
d6b0e80f AC |
1615 | /* Destroy LWP info; it's no longer valid. */ |
1616 | init_lwp_list (); | |
1617 | ||
b84876c2 PA |
1618 | pid = GET_PID (inferior_ptid); |
1619 | inferior_ptid = pid_to_ptid (pid); | |
136d6dae | 1620 | linux_ops->to_detach (ops, args, from_tty); |
b84876c2 PA |
1621 | |
1622 | if (target_can_async_p ()) | |
1623 | drain_queued_events (pid); | |
d6b0e80f AC |
1624 | } |
1625 | ||
1626 | /* Resume LP. */ | |
1627 | ||
1628 | static int | |
1629 | resume_callback (struct lwp_info *lp, void *data) | |
1630 | { | |
1631 | if (lp->stopped && lp->status == 0) | |
1632 | { | |
10d6c8cd DJ |
1633 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
1634 | 0, TARGET_SIGNAL_0); | |
d6b0e80f AC |
1635 | if (debug_linux_nat) |
1636 | fprintf_unfiltered (gdb_stdlog, | |
1637 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1638 | target_pid_to_str (lp->ptid)); | |
1639 | lp->stopped = 0; | |
1640 | lp->step = 0; | |
9f0bdab8 | 1641 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1642 | } |
57380f4e DJ |
1643 | else if (lp->stopped && debug_linux_nat) |
1644 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1645 | target_pid_to_str (lp->ptid)); | |
1646 | else if (debug_linux_nat) | |
1647 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1648 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1649 | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | static int | |
1654 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1655 | { | |
1656 | lp->resumed = 0; | |
1657 | return 0; | |
1658 | } | |
1659 | ||
1660 | static int | |
1661 | resume_set_callback (struct lwp_info *lp, void *data) | |
1662 | { | |
1663 | lp->resumed = 1; | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | static void | |
1668 | linux_nat_resume (ptid_t ptid, int step, enum target_signal signo) | |
1669 | { | |
1670 | struct lwp_info *lp; | |
1671 | int resume_all; | |
1672 | ||
76f50ad1 DJ |
1673 | if (debug_linux_nat) |
1674 | fprintf_unfiltered (gdb_stdlog, | |
1675 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1676 | step ? "step" : "resume", | |
1677 | target_pid_to_str (ptid), | |
1678 | signo ? strsignal (signo) : "0", | |
1679 | target_pid_to_str (inferior_ptid)); | |
1680 | ||
b84876c2 PA |
1681 | if (target_can_async_p ()) |
1682 | /* Block events while we're here. */ | |
84e46146 | 1683 | linux_nat_async_events (sigchld_sync); |
b84876c2 | 1684 | |
d6b0e80f AC |
1685 | /* A specific PTID means `step only this process id'. */ |
1686 | resume_all = (PIDGET (ptid) == -1); | |
1687 | ||
4c28f408 PA |
1688 | if (non_stop && resume_all) |
1689 | internal_error (__FILE__, __LINE__, | |
1690 | "can't resume all in non-stop mode"); | |
1691 | ||
1692 | if (!non_stop) | |
1693 | { | |
1694 | if (resume_all) | |
1695 | iterate_over_lwps (resume_set_callback, NULL); | |
1696 | else | |
1697 | iterate_over_lwps (resume_clear_callback, NULL); | |
1698 | } | |
d6b0e80f AC |
1699 | |
1700 | /* If PID is -1, it's the current inferior that should be | |
1701 | handled specially. */ | |
1702 | if (PIDGET (ptid) == -1) | |
1703 | ptid = inferior_ptid; | |
1704 | ||
1705 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1706 | gdb_assert (lp != NULL); |
d6b0e80f | 1707 | |
4c28f408 | 1708 | /* Convert to something the lower layer understands. */ |
9f0bdab8 | 1709 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); |
d6b0e80f | 1710 | |
9f0bdab8 DJ |
1711 | /* Remember if we're stepping. */ |
1712 | lp->step = step; | |
d6b0e80f | 1713 | |
9f0bdab8 DJ |
1714 | /* Mark this LWP as resumed. */ |
1715 | lp->resumed = 1; | |
76f50ad1 | 1716 | |
9f0bdab8 DJ |
1717 | /* If we have a pending wait status for this thread, there is no |
1718 | point in resuming the process. But first make sure that | |
1719 | linux_nat_wait won't preemptively handle the event - we | |
1720 | should never take this short-circuit if we are going to | |
1721 | leave LP running, since we have skipped resuming all the | |
1722 | other threads. This bit of code needs to be synchronized | |
1723 | with linux_nat_wait. */ | |
76f50ad1 | 1724 | |
710151dd PA |
1725 | /* In async mode, we never have pending wait status. */ |
1726 | if (target_can_async_p () && lp->status) | |
1727 | internal_error (__FILE__, __LINE__, "Pending status in async mode"); | |
1728 | ||
9f0bdab8 DJ |
1729 | if (lp->status && WIFSTOPPED (lp->status)) |
1730 | { | |
d6b48e9c PA |
1731 | int saved_signo; |
1732 | struct inferior *inf; | |
76f50ad1 | 1733 | |
d6b48e9c PA |
1734 | inf = find_inferior_pid (ptid_get_pid (ptid)); |
1735 | gdb_assert (inf); | |
1736 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1737 | ||
1738 | /* Defer to common code if we're gaining control of the | |
1739 | inferior. */ | |
1740 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1741 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1742 | && signal_print_state (saved_signo) == 0 |
1743 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1744 | { |
9f0bdab8 DJ |
1745 | if (debug_linux_nat) |
1746 | fprintf_unfiltered (gdb_stdlog, | |
1747 | "LLR: Not short circuiting for ignored " | |
1748 | "status 0x%x\n", lp->status); | |
1749 | ||
d6b0e80f AC |
1750 | /* FIXME: What should we do if we are supposed to continue |
1751 | this thread with a signal? */ | |
1752 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1753 | signo = saved_signo; |
1754 | lp->status = 0; | |
1755 | } | |
1756 | } | |
76f50ad1 | 1757 | |
9f0bdab8 DJ |
1758 | if (lp->status) |
1759 | { | |
1760 | /* FIXME: What should we do if we are supposed to continue | |
1761 | this thread with a signal? */ | |
1762 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1763 | |
9f0bdab8 DJ |
1764 | if (debug_linux_nat) |
1765 | fprintf_unfiltered (gdb_stdlog, | |
1766 | "LLR: Short circuiting for status 0x%x\n", | |
1767 | lp->status); | |
d6b0e80f | 1768 | |
9f0bdab8 | 1769 | return; |
d6b0e80f AC |
1770 | } |
1771 | ||
9f0bdab8 DJ |
1772 | /* Mark LWP as not stopped to prevent it from being continued by |
1773 | resume_callback. */ | |
1774 | lp->stopped = 0; | |
1775 | ||
d6b0e80f AC |
1776 | if (resume_all) |
1777 | iterate_over_lwps (resume_callback, NULL); | |
1778 | ||
10d6c8cd | 1779 | linux_ops->to_resume (ptid, step, signo); |
9f0bdab8 DJ |
1780 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1781 | ||
d6b0e80f AC |
1782 | if (debug_linux_nat) |
1783 | fprintf_unfiltered (gdb_stdlog, | |
1784 | "LLR: %s %s, %s (resume event thread)\n", | |
1785 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1786 | target_pid_to_str (ptid), | |
1787 | signo ? strsignal (signo) : "0"); | |
b84876c2 PA |
1788 | |
1789 | if (target_can_async_p ()) | |
8ea051c5 | 1790 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1791 | } |
1792 | ||
1793 | /* Issue kill to specified lwp. */ | |
1794 | ||
1795 | static int tkill_failed; | |
1796 | ||
1797 | static int | |
1798 | kill_lwp (int lwpid, int signo) | |
1799 | { | |
1800 | errno = 0; | |
1801 | ||
1802 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1803 | fails, then we are not using nptl threads and we should be using kill. */ | |
1804 | ||
1805 | #ifdef HAVE_TKILL_SYSCALL | |
1806 | if (!tkill_failed) | |
1807 | { | |
1808 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1809 | if (errno != ENOSYS) | |
1810 | return ret; | |
1811 | errno = 0; | |
1812 | tkill_failed = 1; | |
1813 | } | |
1814 | #endif | |
1815 | ||
1816 | return kill (lwpid, signo); | |
1817 | } | |
1818 | ||
3d799a95 DJ |
1819 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1820 | event, we need to add the new LWP to our list (and not report the | |
1821 | trap to higher layers). This function returns non-zero if the | |
1822 | event should be ignored and we should wait again. If STOPPING is | |
1823 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1824 | |
1825 | static int | |
3d799a95 DJ |
1826 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1827 | int stopping) | |
d6b0e80f | 1828 | { |
3d799a95 DJ |
1829 | int pid = GET_LWP (lp->ptid); |
1830 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1831 | struct lwp_info *new_lp = NULL; | |
1832 | int event = status >> 16; | |
d6b0e80f | 1833 | |
3d799a95 DJ |
1834 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1835 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1836 | { |
3d799a95 DJ |
1837 | unsigned long new_pid; |
1838 | int ret; | |
1839 | ||
1840 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1841 | |
3d799a95 DJ |
1842 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1843 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1844 | { | |
1845 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1846 | hits the SIGSTOP, but we're already attached. */ | |
1847 | ret = my_waitpid (new_pid, &status, | |
1848 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1849 | if (ret == -1) | |
1850 | perror_with_name (_("waiting for new child")); | |
1851 | else if (ret != new_pid) | |
1852 | internal_error (__FILE__, __LINE__, | |
1853 | _("wait returned unexpected PID %d"), ret); | |
1854 | else if (!WIFSTOPPED (status)) | |
1855 | internal_error (__FILE__, __LINE__, | |
1856 | _("wait returned unexpected status 0x%x"), status); | |
1857 | } | |
1858 | ||
3a3e9ee3 | 1859 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 DJ |
1860 | |
1861 | if (event == PTRACE_EVENT_FORK) | |
1862 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1863 | else if (event == PTRACE_EVENT_VFORK) | |
1864 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1865 | else |
3d799a95 | 1866 | { |
4c28f408 PA |
1867 | struct cleanup *old_chain; |
1868 | ||
3d799a95 DJ |
1869 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1870 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid))); | |
1871 | new_lp->cloned = 1; | |
4c28f408 | 1872 | new_lp->stopped = 1; |
d6b0e80f | 1873 | |
3d799a95 DJ |
1874 | if (WSTOPSIG (status) != SIGSTOP) |
1875 | { | |
1876 | /* This can happen if someone starts sending signals to | |
1877 | the new thread before it gets a chance to run, which | |
1878 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1879 | This is an unlikely case, and harder to handle for | |
1880 | fork / vfork than for clone, so we do not try - but | |
1881 | we handle it for clone events here. We'll send | |
1882 | the other signal on to the thread below. */ | |
1883 | ||
1884 | new_lp->signalled = 1; | |
1885 | } | |
1886 | else | |
1887 | status = 0; | |
d6b0e80f | 1888 | |
4c28f408 | 1889 | if (non_stop) |
3d799a95 | 1890 | { |
4c28f408 PA |
1891 | /* Add the new thread to GDB's lists as soon as possible |
1892 | so that: | |
1893 | ||
1894 | 1) the frontend doesn't have to wait for a stop to | |
1895 | display them, and, | |
1896 | ||
1897 | 2) we tag it with the correct running state. */ | |
1898 | ||
1899 | /* If the thread_db layer is active, let it know about | |
1900 | this new thread, and add it to GDB's list. */ | |
1901 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
1902 | { | |
1903 | /* We're not using thread_db. Add it to GDB's | |
1904 | list. */ | |
1905 | target_post_attach (GET_LWP (new_lp->ptid)); | |
1906 | add_thread (new_lp->ptid); | |
1907 | } | |
1908 | ||
1909 | if (!stopping) | |
1910 | { | |
1911 | set_running (new_lp->ptid, 1); | |
1912 | set_executing (new_lp->ptid, 1); | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | if (!stopping) | |
1917 | { | |
1918 | new_lp->stopped = 0; | |
3d799a95 | 1919 | new_lp->resumed = 1; |
4c28f408 | 1920 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
1921 | status ? WSTOPSIG (status) : 0); |
1922 | } | |
d6b0e80f | 1923 | |
3d799a95 DJ |
1924 | if (debug_linux_nat) |
1925 | fprintf_unfiltered (gdb_stdlog, | |
1926 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
1927 | GET_LWP (lp->ptid)); | |
1928 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1929 | ||
1930 | return 1; | |
1931 | } | |
1932 | ||
1933 | return 0; | |
d6b0e80f AC |
1934 | } |
1935 | ||
3d799a95 DJ |
1936 | if (event == PTRACE_EVENT_EXEC) |
1937 | { | |
1938 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1939 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 1940 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
1941 | |
1942 | if (linux_parent_pid) | |
1943 | { | |
1944 | detach_breakpoints (linux_parent_pid); | |
1945 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
1946 | ||
1947 | linux_parent_pid = 0; | |
1948 | } | |
1949 | ||
25b22b0a PA |
1950 | /* At this point, all inserted breakpoints are gone. Doing this |
1951 | as soon as we detect an exec prevents the badness of deleting | |
1952 | a breakpoint writing the current "shadow contents" to lift | |
1953 | the bp. That shadow is NOT valid after an exec. | |
1954 | ||
1955 | Note that we have to do this after the detach_breakpoints | |
1956 | call above, otherwise breakpoints wouldn't be lifted from the | |
1957 | parent on a vfork, because detach_breakpoints would think | |
1958 | that breakpoints are not inserted. */ | |
1959 | mark_breakpoints_out (); | |
3d799a95 DJ |
1960 | return 0; |
1961 | } | |
1962 | ||
1963 | internal_error (__FILE__, __LINE__, | |
1964 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
1965 | } |
1966 | ||
1967 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1968 | exited. */ | |
1969 | ||
1970 | static int | |
1971 | wait_lwp (struct lwp_info *lp) | |
1972 | { | |
1973 | pid_t pid; | |
1974 | int status; | |
1975 | int thread_dead = 0; | |
1976 | ||
1977 | gdb_assert (!lp->stopped); | |
1978 | gdb_assert (lp->status == 0); | |
1979 | ||
58aecb61 | 1980 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
1981 | if (pid == -1 && errno == ECHILD) |
1982 | { | |
58aecb61 | 1983 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
1984 | if (pid == -1 && errno == ECHILD) |
1985 | { | |
1986 | /* The thread has previously exited. We need to delete it | |
1987 | now because, for some vendor 2.4 kernels with NPTL | |
1988 | support backported, there won't be an exit event unless | |
1989 | it is the main thread. 2.6 kernels will report an exit | |
1990 | event for each thread that exits, as expected. */ | |
1991 | thread_dead = 1; | |
1992 | if (debug_linux_nat) | |
1993 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1994 | target_pid_to_str (lp->ptid)); | |
1995 | } | |
1996 | } | |
1997 | ||
1998 | if (!thread_dead) | |
1999 | { | |
2000 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2001 | ||
2002 | if (debug_linux_nat) | |
2003 | { | |
2004 | fprintf_unfiltered (gdb_stdlog, | |
2005 | "WL: waitpid %s received %s\n", | |
2006 | target_pid_to_str (lp->ptid), | |
2007 | status_to_str (status)); | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | /* Check if the thread has exited. */ | |
2012 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2013 | { | |
2014 | thread_dead = 1; | |
2015 | if (debug_linux_nat) | |
2016 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2017 | target_pid_to_str (lp->ptid)); | |
2018 | } | |
2019 | ||
2020 | if (thread_dead) | |
2021 | { | |
e26af52f | 2022 | exit_lwp (lp); |
d6b0e80f AC |
2023 | return 0; |
2024 | } | |
2025 | ||
2026 | gdb_assert (WIFSTOPPED (status)); | |
2027 | ||
2028 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2029 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2030 | { | |
2031 | if (debug_linux_nat) | |
2032 | fprintf_unfiltered (gdb_stdlog, | |
2033 | "WL: Handling extended status 0x%06x\n", | |
2034 | status); | |
3d799a95 | 2035 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2036 | return wait_lwp (lp); |
2037 | } | |
2038 | ||
2039 | return status; | |
2040 | } | |
2041 | ||
9f0bdab8 DJ |
2042 | /* Save the most recent siginfo for LP. This is currently only called |
2043 | for SIGTRAP; some ports use the si_addr field for | |
2044 | target_stopped_data_address. In the future, it may also be used to | |
2045 | restore the siginfo of requeued signals. */ | |
2046 | ||
2047 | static void | |
2048 | save_siginfo (struct lwp_info *lp) | |
2049 | { | |
2050 | errno = 0; | |
2051 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2052 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2053 | ||
2054 | if (errno != 0) | |
2055 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2056 | } | |
2057 | ||
d6b0e80f AC |
2058 | /* Send a SIGSTOP to LP. */ |
2059 | ||
2060 | static int | |
2061 | stop_callback (struct lwp_info *lp, void *data) | |
2062 | { | |
2063 | if (!lp->stopped && !lp->signalled) | |
2064 | { | |
2065 | int ret; | |
2066 | ||
2067 | if (debug_linux_nat) | |
2068 | { | |
2069 | fprintf_unfiltered (gdb_stdlog, | |
2070 | "SC: kill %s **<SIGSTOP>**\n", | |
2071 | target_pid_to_str (lp->ptid)); | |
2072 | } | |
2073 | errno = 0; | |
2074 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2075 | if (debug_linux_nat) | |
2076 | { | |
2077 | fprintf_unfiltered (gdb_stdlog, | |
2078 | "SC: lwp kill %d %s\n", | |
2079 | ret, | |
2080 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2081 | } | |
2082 | ||
2083 | lp->signalled = 1; | |
2084 | gdb_assert (lp->status == 0); | |
2085 | } | |
2086 | ||
2087 | return 0; | |
2088 | } | |
2089 | ||
57380f4e | 2090 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2091 | |
2092 | static int | |
57380f4e DJ |
2093 | linux_nat_has_pending_sigint (int pid) |
2094 | { | |
2095 | sigset_t pending, blocked, ignored; | |
2096 | int i; | |
2097 | ||
2098 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2099 | ||
2100 | if (sigismember (&pending, SIGINT) | |
2101 | && !sigismember (&ignored, SIGINT)) | |
2102 | return 1; | |
2103 | ||
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2108 | ||
2109 | static int | |
2110 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2111 | { |
57380f4e DJ |
2112 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2113 | flag to consume the next one. */ | |
2114 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2115 | && WSTOPSIG (lp->status) == SIGINT) | |
2116 | lp->status = 0; | |
2117 | else | |
2118 | lp->ignore_sigint = 1; | |
2119 | ||
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2124 | This function is called after we know the LWP has stopped; if the LWP | |
2125 | stopped before the expected SIGINT was delivered, then it will never have | |
2126 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2127 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2128 | |
57380f4e DJ |
2129 | static void |
2130 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2131 | { | |
2132 | if (!lp->ignore_sigint) | |
2133 | return; | |
2134 | ||
2135 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2136 | { | |
2137 | if (debug_linux_nat) | |
2138 | fprintf_unfiltered (gdb_stdlog, | |
2139 | "MCIS: Clearing bogus flag for %s\n", | |
2140 | target_pid_to_str (lp->ptid)); | |
2141 | lp->ignore_sigint = 0; | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | /* Wait until LP is stopped. */ | |
2146 | ||
2147 | static int | |
2148 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2149 | { | |
d6b0e80f AC |
2150 | if (!lp->stopped) |
2151 | { | |
2152 | int status; | |
2153 | ||
2154 | status = wait_lwp (lp); | |
2155 | if (status == 0) | |
2156 | return 0; | |
2157 | ||
57380f4e DJ |
2158 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2159 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2160 | { |
57380f4e | 2161 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2162 | |
2163 | errno = 0; | |
2164 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2165 | if (debug_linux_nat) | |
2166 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2167 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2168 | target_pid_to_str (lp->ptid), |
2169 | errno ? safe_strerror (errno) : "OK"); | |
2170 | ||
57380f4e | 2171 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2172 | } |
2173 | ||
57380f4e DJ |
2174 | maybe_clear_ignore_sigint (lp); |
2175 | ||
d6b0e80f AC |
2176 | if (WSTOPSIG (status) != SIGSTOP) |
2177 | { | |
2178 | if (WSTOPSIG (status) == SIGTRAP) | |
2179 | { | |
2180 | /* If a LWP other than the LWP that we're reporting an | |
2181 | event for has hit a GDB breakpoint (as opposed to | |
2182 | some random trap signal), then just arrange for it to | |
2183 | hit it again later. We don't keep the SIGTRAP status | |
2184 | and don't forward the SIGTRAP signal to the LWP. We | |
2185 | will handle the current event, eventually we will | |
2186 | resume all LWPs, and this one will get its breakpoint | |
2187 | trap again. | |
2188 | ||
2189 | If we do not do this, then we run the risk that the | |
2190 | user will delete or disable the breakpoint, but the | |
2191 | thread will have already tripped on it. */ | |
2192 | ||
9f0bdab8 DJ |
2193 | /* Save the trap's siginfo in case we need it later. */ |
2194 | save_siginfo (lp); | |
2195 | ||
d6b0e80f AC |
2196 | /* Now resume this LWP and get the SIGSTOP event. */ |
2197 | errno = 0; | |
2198 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2199 | if (debug_linux_nat) | |
2200 | { | |
2201 | fprintf_unfiltered (gdb_stdlog, | |
2202 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2203 | target_pid_to_str (lp->ptid), | |
2204 | errno ? safe_strerror (errno) : "OK"); | |
2205 | ||
2206 | fprintf_unfiltered (gdb_stdlog, | |
2207 | "SWC: Candidate SIGTRAP event in %s\n", | |
2208 | target_pid_to_str (lp->ptid)); | |
2209 | } | |
710151dd PA |
2210 | /* Hold this event/waitstatus while we check to see if |
2211 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2212 | stop_wait_callback (lp, NULL); |
710151dd PA |
2213 | |
2214 | if (target_can_async_p ()) | |
d6b0e80f | 2215 | { |
710151dd PA |
2216 | /* Don't leave a pending wait status in async mode. |
2217 | Retrigger the breakpoint. */ | |
2218 | if (!cancel_breakpoint (lp)) | |
d6b0e80f | 2219 | { |
710151dd PA |
2220 | /* There was no gdb breakpoint set at pc. Put |
2221 | the event back in the queue. */ | |
2222 | if (debug_linux_nat) | |
252fbfc8 PA |
2223 | fprintf_unfiltered (gdb_stdlog, "\ |
2224 | SWC: leaving SIGTRAP in local queue of %s\n", target_pid_to_str (lp->ptid)); | |
2225 | push_waitpid (GET_LWP (lp->ptid), | |
2226 | W_STOPCODE (SIGTRAP), | |
2227 | lp->cloned ? __WCLONE : 0); | |
710151dd PA |
2228 | } |
2229 | } | |
2230 | else | |
2231 | { | |
2232 | /* Hold the SIGTRAP for handling by | |
2233 | linux_nat_wait. */ | |
2234 | /* If there's another event, throw it back into the | |
2235 | queue. */ | |
2236 | if (lp->status) | |
2237 | { | |
2238 | if (debug_linux_nat) | |
2239 | fprintf_unfiltered (gdb_stdlog, | |
2240 | "SWC: kill %s, %s\n", | |
2241 | target_pid_to_str (lp->ptid), | |
2242 | status_to_str ((int) status)); | |
2243 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2244 | } |
710151dd PA |
2245 | /* Save the sigtrap event. */ |
2246 | lp->status = status; | |
d6b0e80f | 2247 | } |
d6b0e80f AC |
2248 | return 0; |
2249 | } | |
2250 | else | |
2251 | { | |
2252 | /* The thread was stopped with a signal other than | |
2253 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2254 | ||
2255 | if (debug_linux_nat) | |
2256 | { | |
2257 | fprintf_unfiltered (gdb_stdlog, | |
2258 | "SWC: Pending event %s in %s\n", | |
2259 | status_to_str ((int) status), | |
2260 | target_pid_to_str (lp->ptid)); | |
2261 | } | |
2262 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2263 | errno = 0; | |
2264 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2265 | if (debug_linux_nat) | |
2266 | fprintf_unfiltered (gdb_stdlog, | |
2267 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2268 | target_pid_to_str (lp->ptid), | |
2269 | errno ? safe_strerror (errno) : "OK"); | |
2270 | ||
2271 | /* Hold this event/waitstatus while we check to see if | |
2272 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2273 | stop_wait_callback (lp, NULL); |
710151dd PA |
2274 | |
2275 | /* If the lp->status field is still empty, use it to | |
2276 | hold this event. If not, then this event must be | |
2277 | returned to the event queue of the LWP. */ | |
2278 | if (lp->status || target_can_async_p ()) | |
d6b0e80f AC |
2279 | { |
2280 | if (debug_linux_nat) | |
2281 | { | |
2282 | fprintf_unfiltered (gdb_stdlog, | |
2283 | "SWC: kill %s, %s\n", | |
2284 | target_pid_to_str (lp->ptid), | |
2285 | status_to_str ((int) status)); | |
2286 | } | |
2287 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2288 | } | |
710151dd PA |
2289 | else |
2290 | lp->status = status; | |
d6b0e80f AC |
2291 | return 0; |
2292 | } | |
2293 | } | |
2294 | else | |
2295 | { | |
2296 | /* We caught the SIGSTOP that we intended to catch, so | |
2297 | there's no SIGSTOP pending. */ | |
2298 | lp->stopped = 1; | |
2299 | lp->signalled = 0; | |
2300 | } | |
2301 | } | |
2302 | ||
2303 | return 0; | |
2304 | } | |
2305 | ||
d6b0e80f AC |
2306 | /* Return non-zero if LP has a wait status pending. */ |
2307 | ||
2308 | static int | |
2309 | status_callback (struct lwp_info *lp, void *data) | |
2310 | { | |
2311 | /* Only report a pending wait status if we pretend that this has | |
2312 | indeed been resumed. */ | |
2313 | return (lp->status != 0 && lp->resumed); | |
2314 | } | |
2315 | ||
2316 | /* Return non-zero if LP isn't stopped. */ | |
2317 | ||
2318 | static int | |
2319 | running_callback (struct lwp_info *lp, void *data) | |
2320 | { | |
2321 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2322 | } | |
2323 | ||
2324 | /* Count the LWP's that have had events. */ | |
2325 | ||
2326 | static int | |
2327 | count_events_callback (struct lwp_info *lp, void *data) | |
2328 | { | |
2329 | int *count = data; | |
2330 | ||
2331 | gdb_assert (count != NULL); | |
2332 | ||
e09490f1 DJ |
2333 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2334 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2335 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2336 | (*count)++; | |
2337 | ||
2338 | return 0; | |
2339 | } | |
2340 | ||
2341 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2342 | ||
2343 | static int | |
2344 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2345 | { | |
2346 | if (lp->step && lp->status != 0) | |
2347 | return 1; | |
2348 | else | |
2349 | return 0; | |
2350 | } | |
2351 | ||
2352 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2353 | ||
2354 | static int | |
2355 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2356 | { | |
2357 | int *selector = data; | |
2358 | ||
2359 | gdb_assert (selector != NULL); | |
2360 | ||
e09490f1 DJ |
2361 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2362 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2363 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2364 | if ((*selector)-- == 0) | |
2365 | return 1; | |
2366 | ||
2367 | return 0; | |
2368 | } | |
2369 | ||
710151dd PA |
2370 | static int |
2371 | cancel_breakpoint (struct lwp_info *lp) | |
2372 | { | |
2373 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2374 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2375 | LWP. We will handle the current event, eventually we will resume | |
2376 | this LWP, and this breakpoint will trap again. | |
2377 | ||
2378 | If we do not do this, then we run the risk that the user will | |
2379 | delete or disable the breakpoint, but the LWP will have already | |
2380 | tripped on it. */ | |
2381 | ||
515630c5 UW |
2382 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2383 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2384 | CORE_ADDR pc; | |
2385 | ||
2386 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2387 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2388 | { |
2389 | if (debug_linux_nat) | |
2390 | fprintf_unfiltered (gdb_stdlog, | |
2391 | "CB: Push back breakpoint for %s\n", | |
2392 | target_pid_to_str (lp->ptid)); | |
2393 | ||
2394 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2395 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2396 | regcache_write_pc (regcache, pc); | |
2397 | ||
710151dd PA |
2398 | return 1; |
2399 | } | |
2400 | return 0; | |
2401 | } | |
2402 | ||
d6b0e80f AC |
2403 | static int |
2404 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2405 | { | |
2406 | struct lwp_info *event_lp = data; | |
2407 | ||
2408 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2409 | if (lp == event_lp) | |
2410 | return 0; | |
2411 | ||
2412 | /* If a LWP other than the LWP that we're reporting an event for has | |
2413 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2414 | then just arrange for it to hit it again later. We don't keep | |
2415 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2416 | LWP. We will handle the current event, eventually we will resume | |
2417 | all LWPs, and this one will get its breakpoint trap again. | |
2418 | ||
2419 | If we do not do this, then we run the risk that the user will | |
2420 | delete or disable the breakpoint, but the LWP will have already | |
2421 | tripped on it. */ | |
2422 | ||
2423 | if (lp->status != 0 | |
2424 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2425 | && cancel_breakpoint (lp)) |
2426 | /* Throw away the SIGTRAP. */ | |
2427 | lp->status = 0; | |
d6b0e80f AC |
2428 | |
2429 | return 0; | |
2430 | } | |
2431 | ||
2432 | /* Select one LWP out of those that have events pending. */ | |
2433 | ||
2434 | static void | |
2435 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
2436 | { | |
2437 | int num_events = 0; | |
2438 | int random_selector; | |
2439 | struct lwp_info *event_lp; | |
2440 | ||
ac264b3b | 2441 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2442 | (*orig_lp)->status = *status; |
2443 | ||
2444 | /* Give preference to any LWP that is being single-stepped. */ | |
2445 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
2446 | if (event_lp != NULL) | |
2447 | { | |
2448 | if (debug_linux_nat) | |
2449 | fprintf_unfiltered (gdb_stdlog, | |
2450 | "SEL: Select single-step %s\n", | |
2451 | target_pid_to_str (event_lp->ptid)); | |
2452 | } | |
2453 | else | |
2454 | { | |
2455 | /* No single-stepping LWP. Select one at random, out of those | |
2456 | which have had SIGTRAP events. */ | |
2457 | ||
2458 | /* First see how many SIGTRAP events we have. */ | |
2459 | iterate_over_lwps (count_events_callback, &num_events); | |
2460 | ||
2461 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2462 | random_selector = (int) | |
2463 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2464 | ||
2465 | if (debug_linux_nat && num_events > 1) | |
2466 | fprintf_unfiltered (gdb_stdlog, | |
2467 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2468 | num_events, random_selector); | |
2469 | ||
2470 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
2471 | &random_selector); | |
2472 | } | |
2473 | ||
2474 | if (event_lp != NULL) | |
2475 | { | |
2476 | /* Switch the event LWP. */ | |
2477 | *orig_lp = event_lp; | |
2478 | *status = event_lp->status; | |
2479 | } | |
2480 | ||
2481 | /* Flush the wait status for the event LWP. */ | |
2482 | (*orig_lp)->status = 0; | |
2483 | } | |
2484 | ||
2485 | /* Return non-zero if LP has been resumed. */ | |
2486 | ||
2487 | static int | |
2488 | resumed_callback (struct lwp_info *lp, void *data) | |
2489 | { | |
2490 | return lp->resumed; | |
2491 | } | |
2492 | ||
d6b0e80f AC |
2493 | /* Stop an active thread, verify it still exists, then resume it. */ |
2494 | ||
2495 | static int | |
2496 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2497 | { | |
2498 | struct lwp_info *ptr; | |
2499 | ||
2500 | if (!lp->stopped && !lp->signalled) | |
2501 | { | |
2502 | stop_callback (lp, NULL); | |
2503 | stop_wait_callback (lp, NULL); | |
2504 | /* Resume if the lwp still exists. */ | |
2505 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2506 | if (lp == ptr) | |
2507 | { | |
2508 | resume_callback (lp, NULL); | |
2509 | resume_set_callback (lp, NULL); | |
2510 | } | |
2511 | } | |
2512 | return 0; | |
2513 | } | |
2514 | ||
02f3fc28 | 2515 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2516 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2517 | static struct lwp_info * |
2518 | linux_nat_filter_event (int lwpid, int status, int options) | |
2519 | { | |
2520 | struct lwp_info *lp; | |
2521 | ||
2522 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2523 | ||
2524 | /* Check for stop events reported by a process we didn't already | |
2525 | know about - anything not already in our LWP list. | |
2526 | ||
2527 | If we're expecting to receive stopped processes after | |
2528 | fork, vfork, and clone events, then we'll just add the | |
2529 | new one to our list and go back to waiting for the event | |
2530 | to be reported - the stopped process might be returned | |
2531 | from waitpid before or after the event is. */ | |
2532 | if (WIFSTOPPED (status) && !lp) | |
2533 | { | |
2534 | linux_record_stopped_pid (lwpid, status); | |
2535 | return NULL; | |
2536 | } | |
2537 | ||
2538 | /* Make sure we don't report an event for the exit of an LWP not in | |
2539 | our list, i.e. not part of the current process. This can happen | |
2540 | if we detach from a program we original forked and then it | |
2541 | exits. */ | |
2542 | if (!WIFSTOPPED (status) && !lp) | |
2543 | return NULL; | |
2544 | ||
2545 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2546 | CLONE_PTRACE processes which do not use the thread library - | |
2547 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2548 | currently work, and the following code is currently unreachable | |
2549 | due to the two blocks above. If it's fixed some day, this code | |
2550 | should be broken out into a function so that we can also pick up | |
2551 | LWPs from the new interface. */ | |
2552 | if (!lp) | |
2553 | { | |
2554 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2555 | if (options & __WCLONE) | |
2556 | lp->cloned = 1; | |
2557 | ||
2558 | gdb_assert (WIFSTOPPED (status) | |
2559 | && WSTOPSIG (status) == SIGSTOP); | |
2560 | lp->signalled = 1; | |
2561 | ||
2562 | if (!in_thread_list (inferior_ptid)) | |
2563 | { | |
2564 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2565 | GET_PID (inferior_ptid)); | |
2566 | add_thread (inferior_ptid); | |
2567 | } | |
2568 | ||
2569 | add_thread (lp->ptid); | |
2570 | } | |
2571 | ||
2572 | /* Save the trap's siginfo in case we need it later. */ | |
2573 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2574 | save_siginfo (lp); | |
2575 | ||
2576 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2577 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2578 | { | |
2579 | if (debug_linux_nat) | |
2580 | fprintf_unfiltered (gdb_stdlog, | |
2581 | "LLW: Handling extended status 0x%06x\n", | |
2582 | status); | |
2583 | if (linux_handle_extended_wait (lp, status, 0)) | |
2584 | return NULL; | |
2585 | } | |
2586 | ||
2587 | /* Check if the thread has exited. */ | |
2588 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2589 | { | |
2590 | /* If this is the main thread, we must stop all threads and | |
2591 | verify if they are still alive. This is because in the nptl | |
2592 | thread model, there is no signal issued for exiting LWPs | |
2593 | other than the main thread. We only get the main thread exit | |
2594 | signal once all child threads have already exited. If we | |
2595 | stop all the threads and use the stop_wait_callback to check | |
2596 | if they have exited we can determine whether this signal | |
2597 | should be ignored or whether it means the end of the debugged | |
2598 | application, regardless of which threading model is being | |
2599 | used. */ | |
2600 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) | |
2601 | { | |
2602 | lp->stopped = 1; | |
2603 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2604 | } | |
2605 | ||
2606 | if (debug_linux_nat) | |
2607 | fprintf_unfiltered (gdb_stdlog, | |
2608 | "LLW: %s exited.\n", | |
2609 | target_pid_to_str (lp->ptid)); | |
2610 | ||
2611 | exit_lwp (lp); | |
2612 | ||
2613 | /* If there is at least one more LWP, then the exit signal was | |
2614 | not the end of the debugged application and should be | |
2615 | ignored. */ | |
2616 | if (num_lwps > 0) | |
4c28f408 | 2617 | return NULL; |
02f3fc28 PA |
2618 | } |
2619 | ||
2620 | /* Check if the current LWP has previously exited. In the nptl | |
2621 | thread model, LWPs other than the main thread do not issue | |
2622 | signals when they exit so we must check whenever the thread has | |
2623 | stopped. A similar check is made in stop_wait_callback(). */ | |
2624 | if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid)) | |
2625 | { | |
2626 | if (debug_linux_nat) | |
2627 | fprintf_unfiltered (gdb_stdlog, | |
2628 | "LLW: %s exited.\n", | |
2629 | target_pid_to_str (lp->ptid)); | |
2630 | ||
2631 | exit_lwp (lp); | |
2632 | ||
2633 | /* Make sure there is at least one thread running. */ | |
2634 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2635 | ||
2636 | /* Discard the event. */ | |
2637 | return NULL; | |
2638 | } | |
2639 | ||
2640 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2641 | an attempt to stop an LWP. */ | |
2642 | if (lp->signalled | |
2643 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2644 | { | |
2645 | if (debug_linux_nat) | |
2646 | fprintf_unfiltered (gdb_stdlog, | |
2647 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2648 | target_pid_to_str (lp->ptid)); | |
2649 | ||
2650 | /* This is a delayed SIGSTOP. */ | |
2651 | lp->signalled = 0; | |
2652 | ||
2653 | registers_changed (); | |
2654 | ||
2655 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), | |
2656 | lp->step, TARGET_SIGNAL_0); | |
2657 | if (debug_linux_nat) | |
2658 | fprintf_unfiltered (gdb_stdlog, | |
2659 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2660 | lp->step ? | |
2661 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2662 | target_pid_to_str (lp->ptid)); | |
2663 | ||
2664 | lp->stopped = 0; | |
2665 | gdb_assert (lp->resumed); | |
2666 | ||
2667 | /* Discard the event. */ | |
2668 | return NULL; | |
2669 | } | |
2670 | ||
57380f4e DJ |
2671 | /* Make sure we don't report a SIGINT that we have already displayed |
2672 | for another thread. */ | |
2673 | if (lp->ignore_sigint | |
2674 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2675 | { | |
2676 | if (debug_linux_nat) | |
2677 | fprintf_unfiltered (gdb_stdlog, | |
2678 | "LLW: Delayed SIGINT caught for %s.\n", | |
2679 | target_pid_to_str (lp->ptid)); | |
2680 | ||
2681 | /* This is a delayed SIGINT. */ | |
2682 | lp->ignore_sigint = 0; | |
2683 | ||
2684 | registers_changed (); | |
2685 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), | |
2686 | lp->step, TARGET_SIGNAL_0); | |
2687 | if (debug_linux_nat) | |
2688 | fprintf_unfiltered (gdb_stdlog, | |
2689 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2690 | lp->step ? | |
2691 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2692 | target_pid_to_str (lp->ptid)); | |
2693 | ||
2694 | lp->stopped = 0; | |
2695 | gdb_assert (lp->resumed); | |
2696 | ||
2697 | /* Discard the event. */ | |
2698 | return NULL; | |
2699 | } | |
2700 | ||
02f3fc28 PA |
2701 | /* An interesting event. */ |
2702 | gdb_assert (lp); | |
2703 | return lp; | |
2704 | } | |
2705 | ||
b84876c2 PA |
2706 | /* Get the events stored in the pipe into the local queue, so they are |
2707 | accessible to queued_waitpid. We need to do this, since it is not | |
2708 | always the case that the event at the head of the pipe is the event | |
2709 | we want. */ | |
2710 | ||
2711 | static void | |
2712 | pipe_to_local_event_queue (void) | |
2713 | { | |
2714 | if (debug_linux_nat_async) | |
2715 | fprintf_unfiltered (gdb_stdlog, | |
2716 | "PTLEQ: linux_nat_num_queued_events(%d)\n", | |
2717 | linux_nat_num_queued_events); | |
2718 | while (linux_nat_num_queued_events) | |
2719 | { | |
2720 | int lwpid, status, options; | |
b84876c2 | 2721 | lwpid = linux_nat_event_pipe_pop (&status, &options); |
b84876c2 PA |
2722 | gdb_assert (lwpid > 0); |
2723 | push_waitpid (lwpid, status, options); | |
2724 | } | |
2725 | } | |
2726 | ||
2727 | /* Get the unprocessed events stored in the local queue back into the | |
2728 | pipe, so the event loop realizes there's something else to | |
2729 | process. */ | |
2730 | ||
2731 | static void | |
2732 | local_event_queue_to_pipe (void) | |
2733 | { | |
2734 | struct waitpid_result *w = waitpid_queue; | |
2735 | while (w) | |
2736 | { | |
2737 | struct waitpid_result *next = w->next; | |
2738 | linux_nat_event_pipe_push (w->pid, | |
2739 | w->status, | |
2740 | w->options); | |
2741 | xfree (w); | |
2742 | w = next; | |
2743 | } | |
2744 | waitpid_queue = NULL; | |
2745 | ||
2746 | if (debug_linux_nat_async) | |
2747 | fprintf_unfiltered (gdb_stdlog, | |
2748 | "LEQTP: linux_nat_num_queued_events(%d)\n", | |
2749 | linux_nat_num_queued_events); | |
2750 | } | |
2751 | ||
d6b0e80f AC |
2752 | static ptid_t |
2753 | linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
2754 | { | |
2755 | struct lwp_info *lp = NULL; | |
2756 | int options = 0; | |
2757 | int status = 0; | |
2758 | pid_t pid = PIDGET (ptid); | |
d6b0e80f | 2759 | |
b84876c2 PA |
2760 | if (debug_linux_nat_async) |
2761 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2762 | ||
f973ed9c DJ |
2763 | /* The first time we get here after starting a new inferior, we may |
2764 | not have added it to the LWP list yet - this is the earliest | |
2765 | moment at which we know its PID. */ | |
2766 | if (num_lwps == 0) | |
2767 | { | |
2768 | gdb_assert (!is_lwp (inferior_ptid)); | |
2769 | ||
27c9d204 PA |
2770 | /* Upgrade the main thread's ptid. */ |
2771 | thread_change_ptid (inferior_ptid, | |
2772 | BUILD_LWP (GET_PID (inferior_ptid), | |
2773 | GET_PID (inferior_ptid))); | |
2774 | ||
f973ed9c DJ |
2775 | lp = add_lwp (inferior_ptid); |
2776 | lp->resumed = 1; | |
2777 | } | |
2778 | ||
84e46146 PA |
2779 | /* Block events while we're here. */ |
2780 | linux_nat_async_events (sigchld_sync); | |
d6b0e80f AC |
2781 | |
2782 | retry: | |
2783 | ||
f973ed9c DJ |
2784 | /* Make sure there is at least one LWP that has been resumed. */ |
2785 | gdb_assert (iterate_over_lwps (resumed_callback, NULL)); | |
d6b0e80f AC |
2786 | |
2787 | /* First check if there is a LWP with a wait status pending. */ | |
2788 | if (pid == -1) | |
2789 | { | |
2790 | /* Any LWP that's been resumed will do. */ | |
2791 | lp = iterate_over_lwps (status_callback, NULL); | |
2792 | if (lp) | |
2793 | { | |
710151dd PA |
2794 | if (target_can_async_p ()) |
2795 | internal_error (__FILE__, __LINE__, | |
2796 | "Found an LWP with a pending status in async mode."); | |
2797 | ||
d6b0e80f AC |
2798 | status = lp->status; |
2799 | lp->status = 0; | |
2800 | ||
2801 | if (debug_linux_nat && status) | |
2802 | fprintf_unfiltered (gdb_stdlog, | |
2803 | "LLW: Using pending wait status %s for %s.\n", | |
2804 | status_to_str (status), | |
2805 | target_pid_to_str (lp->ptid)); | |
2806 | } | |
2807 | ||
b84876c2 | 2808 | /* But if we don't find one, we'll have to wait, and check both |
d6b0e80f AC |
2809 | cloned and uncloned processes. We start with the cloned |
2810 | processes. */ | |
2811 | options = __WCLONE | WNOHANG; | |
2812 | } | |
2813 | else if (is_lwp (ptid)) | |
2814 | { | |
2815 | if (debug_linux_nat) | |
2816 | fprintf_unfiltered (gdb_stdlog, | |
2817 | "LLW: Waiting for specific LWP %s.\n", | |
2818 | target_pid_to_str (ptid)); | |
2819 | ||
2820 | /* We have a specific LWP to check. */ | |
2821 | lp = find_lwp_pid (ptid); | |
2822 | gdb_assert (lp); | |
2823 | status = lp->status; | |
2824 | lp->status = 0; | |
2825 | ||
2826 | if (debug_linux_nat && status) | |
2827 | fprintf_unfiltered (gdb_stdlog, | |
2828 | "LLW: Using pending wait status %s for %s.\n", | |
2829 | status_to_str (status), | |
2830 | target_pid_to_str (lp->ptid)); | |
2831 | ||
2832 | /* If we have to wait, take into account whether PID is a cloned | |
2833 | process or not. And we have to convert it to something that | |
2834 | the layer beneath us can understand. */ | |
2835 | options = lp->cloned ? __WCLONE : 0; | |
2836 | pid = GET_LWP (ptid); | |
2837 | } | |
2838 | ||
2839 | if (status && lp->signalled) | |
2840 | { | |
2841 | /* A pending SIGSTOP may interfere with the normal stream of | |
2842 | events. In a typical case where interference is a problem, | |
2843 | we have a SIGSTOP signal pending for LWP A while | |
2844 | single-stepping it, encounter an event in LWP B, and take the | |
2845 | pending SIGSTOP while trying to stop LWP A. After processing | |
2846 | the event in LWP B, LWP A is continued, and we'll never see | |
2847 | the SIGTRAP associated with the last time we were | |
2848 | single-stepping LWP A. */ | |
2849 | ||
2850 | /* Resume the thread. It should halt immediately returning the | |
2851 | pending SIGSTOP. */ | |
2852 | registers_changed (); | |
10d6c8cd DJ |
2853 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2854 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2855 | if (debug_linux_nat) |
2856 | fprintf_unfiltered (gdb_stdlog, | |
2857 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2858 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2859 | target_pid_to_str (lp->ptid)); | |
2860 | lp->stopped = 0; | |
2861 | gdb_assert (lp->resumed); | |
2862 | ||
2863 | /* This should catch the pending SIGSTOP. */ | |
2864 | stop_wait_callback (lp, NULL); | |
2865 | } | |
2866 | ||
b84876c2 PA |
2867 | if (!target_can_async_p ()) |
2868 | { | |
2869 | /* Causes SIGINT to be passed on to the attached process. */ | |
2870 | set_sigint_trap (); | |
2871 | set_sigio_trap (); | |
2872 | } | |
d6b0e80f AC |
2873 | |
2874 | while (status == 0) | |
2875 | { | |
2876 | pid_t lwpid; | |
2877 | ||
b84876c2 PA |
2878 | if (target_can_async_p ()) |
2879 | /* In async mode, don't ever block. Only look at the locally | |
2880 | queued events. */ | |
2881 | lwpid = queued_waitpid (pid, &status, options); | |
2882 | else | |
2883 | lwpid = my_waitpid (pid, &status, options); | |
2884 | ||
d6b0e80f AC |
2885 | if (lwpid > 0) |
2886 | { | |
2887 | gdb_assert (pid == -1 || lwpid == pid); | |
2888 | ||
2889 | if (debug_linux_nat) | |
2890 | { | |
2891 | fprintf_unfiltered (gdb_stdlog, | |
2892 | "LLW: waitpid %ld received %s\n", | |
2893 | (long) lwpid, status_to_str (status)); | |
2894 | } | |
2895 | ||
02f3fc28 | 2896 | lp = linux_nat_filter_event (lwpid, status, options); |
d6b0e80f AC |
2897 | if (!lp) |
2898 | { | |
02f3fc28 | 2899 | /* A discarded event. */ |
d6b0e80f AC |
2900 | status = 0; |
2901 | continue; | |
2902 | } | |
2903 | ||
2904 | break; | |
2905 | } | |
2906 | ||
2907 | if (pid == -1) | |
2908 | { | |
2909 | /* Alternate between checking cloned and uncloned processes. */ | |
2910 | options ^= __WCLONE; | |
2911 | ||
b84876c2 PA |
2912 | /* And every time we have checked both: |
2913 | In async mode, return to event loop; | |
2914 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 2915 | if (options & __WCLONE) |
b84876c2 PA |
2916 | { |
2917 | if (target_can_async_p ()) | |
2918 | { | |
2919 | /* No interesting event. */ | |
2920 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2921 | ||
2922 | /* Get ready for the next event. */ | |
2923 | target_async (inferior_event_handler, 0); | |
2924 | ||
2925 | if (debug_linux_nat_async) | |
2926 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
2927 | ||
2928 | return minus_one_ptid; | |
2929 | } | |
2930 | ||
2931 | sigsuspend (&suspend_mask); | |
2932 | } | |
d6b0e80f AC |
2933 | } |
2934 | ||
2935 | /* We shouldn't end up here unless we want to try again. */ | |
2936 | gdb_assert (status == 0); | |
2937 | } | |
2938 | ||
b84876c2 PA |
2939 | if (!target_can_async_p ()) |
2940 | { | |
2941 | clear_sigio_trap (); | |
2942 | clear_sigint_trap (); | |
2943 | } | |
d6b0e80f AC |
2944 | |
2945 | gdb_assert (lp); | |
2946 | ||
2947 | /* Don't report signals that GDB isn't interested in, such as | |
2948 | signals that are neither printed nor stopped upon. Stopping all | |
2949 | threads can be a bit time-consuming so if we want decent | |
2950 | performance with heavily multi-threaded programs, especially when | |
2951 | they're using a high frequency timer, we'd better avoid it if we | |
2952 | can. */ | |
2953 | ||
2954 | if (WIFSTOPPED (status)) | |
2955 | { | |
2956 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
2957 | struct inferior *inf; |
2958 | ||
2959 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
2960 | gdb_assert (inf); | |
d6b0e80f | 2961 | |
d6b48e9c PA |
2962 | /* Defer to common code if we get a signal while |
2963 | single-stepping, since that may need special care, e.g. to | |
2964 | skip the signal handler, or, if we're gaining control of the | |
2965 | inferior. */ | |
d539ed7e | 2966 | if (!lp->step |
d6b48e9c | 2967 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 2968 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
2969 | && signal_print_state (signo) == 0 |
2970 | && signal_pass_state (signo) == 1) | |
2971 | { | |
2972 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2973 | here? It is not clear we should. GDB may not expect | |
2974 | other threads to run. On the other hand, not resuming | |
2975 | newly attached threads may cause an unwanted delay in | |
2976 | getting them running. */ | |
2977 | registers_changed (); | |
10d6c8cd DJ |
2978 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2979 | lp->step, signo); | |
d6b0e80f AC |
2980 | if (debug_linux_nat) |
2981 | fprintf_unfiltered (gdb_stdlog, | |
2982 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2983 | lp->step ? | |
2984 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2985 | target_pid_to_str (lp->ptid), | |
2986 | signo ? strsignal (signo) : "0"); | |
2987 | lp->stopped = 0; | |
2988 | status = 0; | |
2989 | goto retry; | |
2990 | } | |
2991 | ||
1ad15515 | 2992 | if (!non_stop) |
d6b0e80f | 2993 | { |
1ad15515 PA |
2994 | /* Only do the below in all-stop, as we currently use SIGINT |
2995 | to implement target_stop (see linux_nat_stop) in | |
2996 | non-stop. */ | |
2997 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2998 | { | |
2999 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3000 | forwarded to the entire process group, that is, all LWPs | |
3001 | will receive it - unless they're using CLONE_THREAD to | |
3002 | share signals. Since we only want to report it once, we | |
3003 | mark it as ignored for all LWPs except this one. */ | |
3004 | iterate_over_lwps (set_ignore_sigint, NULL); | |
3005 | lp->ignore_sigint = 0; | |
3006 | } | |
3007 | else | |
3008 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3009 | } |
3010 | } | |
3011 | ||
3012 | /* This LWP is stopped now. */ | |
3013 | lp->stopped = 1; | |
3014 | ||
3015 | if (debug_linux_nat) | |
3016 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3017 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3018 | ||
4c28f408 PA |
3019 | if (!non_stop) |
3020 | { | |
3021 | /* Now stop all other LWP's ... */ | |
3022 | iterate_over_lwps (stop_callback, NULL); | |
3023 | ||
3024 | /* ... and wait until all of them have reported back that | |
3025 | they're no longer running. */ | |
57380f4e | 3026 | iterate_over_lwps (stop_wait_callback, NULL); |
4c28f408 PA |
3027 | |
3028 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3029 | from among those that have had events. Giving equal priority | |
3030 | to all LWPs that have had events helps prevent | |
3031 | starvation. */ | |
3032 | if (pid == -1) | |
3033 | select_event_lwp (&lp, &status); | |
3034 | } | |
d6b0e80f AC |
3035 | |
3036 | /* Now that we've selected our final event LWP, cancel any | |
3037 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3038 | the comment in cancel_breakpoints_callback to find out why. */ | |
3039 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
3040 | ||
d6b0e80f AC |
3041 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3042 | { | |
d6b0e80f AC |
3043 | if (debug_linux_nat) |
3044 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3045 | "LLW: trap ptid is %s.\n", |
3046 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3047 | } |
d6b0e80f AC |
3048 | |
3049 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3050 | { | |
3051 | *ourstatus = lp->waitstatus; | |
3052 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3053 | } | |
3054 | else | |
3055 | store_waitstatus (ourstatus, status); | |
3056 | ||
b84876c2 PA |
3057 | /* Get ready for the next event. */ |
3058 | if (target_can_async_p ()) | |
3059 | target_async (inferior_event_handler, 0); | |
3060 | ||
3061 | if (debug_linux_nat_async) | |
3062 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3063 | ||
f973ed9c | 3064 | return lp->ptid; |
d6b0e80f AC |
3065 | } |
3066 | ||
3067 | static int | |
3068 | kill_callback (struct lwp_info *lp, void *data) | |
3069 | { | |
3070 | errno = 0; | |
3071 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3072 | if (debug_linux_nat) | |
3073 | fprintf_unfiltered (gdb_stdlog, | |
3074 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3075 | target_pid_to_str (lp->ptid), | |
3076 | errno ? safe_strerror (errno) : "OK"); | |
3077 | ||
3078 | return 0; | |
3079 | } | |
3080 | ||
3081 | static int | |
3082 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3083 | { | |
3084 | pid_t pid; | |
3085 | ||
3086 | /* We must make sure that there are no pending events (delayed | |
3087 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3088 | program doesn't interfere with any following debugging session. */ | |
3089 | ||
3090 | /* For cloned processes we must check both with __WCLONE and | |
3091 | without, since the exit status of a cloned process isn't reported | |
3092 | with __WCLONE. */ | |
3093 | if (lp->cloned) | |
3094 | { | |
3095 | do | |
3096 | { | |
58aecb61 | 3097 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3098 | if (pid != (pid_t) -1) |
d6b0e80f | 3099 | { |
e85a822c DJ |
3100 | if (debug_linux_nat) |
3101 | fprintf_unfiltered (gdb_stdlog, | |
3102 | "KWC: wait %s received unknown.\n", | |
3103 | target_pid_to_str (lp->ptid)); | |
3104 | /* The Linux kernel sometimes fails to kill a thread | |
3105 | completely after PTRACE_KILL; that goes from the stop | |
3106 | point in do_fork out to the one in | |
3107 | get_signal_to_deliever and waits again. So kill it | |
3108 | again. */ | |
3109 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3110 | } |
3111 | } | |
3112 | while (pid == GET_LWP (lp->ptid)); | |
3113 | ||
3114 | gdb_assert (pid == -1 && errno == ECHILD); | |
3115 | } | |
3116 | ||
3117 | do | |
3118 | { | |
58aecb61 | 3119 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3120 | if (pid != (pid_t) -1) |
d6b0e80f | 3121 | { |
e85a822c DJ |
3122 | if (debug_linux_nat) |
3123 | fprintf_unfiltered (gdb_stdlog, | |
3124 | "KWC: wait %s received unk.\n", | |
3125 | target_pid_to_str (lp->ptid)); | |
3126 | /* See the call to kill_callback above. */ | |
3127 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3128 | } |
3129 | } | |
3130 | while (pid == GET_LWP (lp->ptid)); | |
3131 | ||
3132 | gdb_assert (pid == -1 && errno == ECHILD); | |
3133 | return 0; | |
3134 | } | |
3135 | ||
3136 | static void | |
3137 | linux_nat_kill (void) | |
3138 | { | |
f973ed9c DJ |
3139 | struct target_waitstatus last; |
3140 | ptid_t last_ptid; | |
3141 | int status; | |
d6b0e80f | 3142 | |
b84876c2 PA |
3143 | if (target_can_async_p ()) |
3144 | target_async (NULL, 0); | |
3145 | ||
f973ed9c DJ |
3146 | /* If we're stopped while forking and we haven't followed yet, |
3147 | kill the other task. We need to do this first because the | |
3148 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3149 | |
f973ed9c | 3150 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3151 | |
f973ed9c DJ |
3152 | if (last.kind == TARGET_WAITKIND_FORKED |
3153 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3154 | { | |
3a3e9ee3 | 3155 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3156 | wait (&status); |
3157 | } | |
3158 | ||
3159 | if (forks_exist_p ()) | |
b84876c2 PA |
3160 | { |
3161 | linux_fork_killall (); | |
3162 | drain_queued_events (-1); | |
3163 | } | |
f973ed9c DJ |
3164 | else |
3165 | { | |
4c28f408 PA |
3166 | /* Stop all threads before killing them, since ptrace requires |
3167 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
3168 | iterate_over_lwps (stop_callback, NULL); | |
3169 | /* ... and wait until all of them have reported back that | |
3170 | they're no longer running. */ | |
3171 | iterate_over_lwps (stop_wait_callback, NULL); | |
3172 | ||
f973ed9c DJ |
3173 | /* Kill all LWP's ... */ |
3174 | iterate_over_lwps (kill_callback, NULL); | |
3175 | ||
3176 | /* ... and wait until we've flushed all events. */ | |
3177 | iterate_over_lwps (kill_wait_callback, NULL); | |
3178 | } | |
3179 | ||
3180 | target_mourn_inferior (); | |
d6b0e80f AC |
3181 | } |
3182 | ||
3183 | static void | |
136d6dae | 3184 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3185 | { |
d6b0e80f AC |
3186 | /* Destroy LWP info; it's no longer valid. */ |
3187 | init_lwp_list (); | |
3188 | ||
f973ed9c | 3189 | if (! forks_exist_p ()) |
b84876c2 PA |
3190 | { |
3191 | /* Normal case, no other forks available. */ | |
3192 | if (target_can_async_p ()) | |
3193 | linux_nat_async (NULL, 0); | |
136d6dae | 3194 | linux_ops->to_mourn_inferior (ops); |
b84876c2 | 3195 | } |
f973ed9c DJ |
3196 | else |
3197 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3198 | there are other viable forks to debug. Delete the exiting | |
3199 | one and context-switch to the first available. */ | |
3200 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3201 | } |
3202 | ||
10d6c8cd DJ |
3203 | static LONGEST |
3204 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3205 | const char *annex, gdb_byte *readbuf, | |
3206 | const gdb_byte *writebuf, | |
3207 | ULONGEST offset, LONGEST len) | |
d6b0e80f AC |
3208 | { |
3209 | struct cleanup *old_chain = save_inferior_ptid (); | |
10d6c8cd | 3210 | LONGEST xfer; |
d6b0e80f AC |
3211 | |
3212 | if (is_lwp (inferior_ptid)) | |
3213 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3214 | ||
10d6c8cd DJ |
3215 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3216 | offset, len); | |
d6b0e80f AC |
3217 | |
3218 | do_cleanups (old_chain); | |
3219 | return xfer; | |
3220 | } | |
3221 | ||
3222 | static int | |
3223 | linux_nat_thread_alive (ptid_t ptid) | |
3224 | { | |
4c28f408 PA |
3225 | int err; |
3226 | ||
d6b0e80f AC |
3227 | gdb_assert (is_lwp (ptid)); |
3228 | ||
4c28f408 PA |
3229 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3230 | running thread errors out claiming that the thread doesn't | |
3231 | exist. */ | |
3232 | err = kill_lwp (GET_LWP (ptid), 0); | |
3233 | ||
d6b0e80f AC |
3234 | if (debug_linux_nat) |
3235 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3236 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3237 | target_pid_to_str (ptid), |
4c28f408 | 3238 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3239 | |
4c28f408 | 3240 | if (err != 0) |
d6b0e80f AC |
3241 | return 0; |
3242 | ||
3243 | return 1; | |
3244 | } | |
3245 | ||
3246 | static char * | |
3247 | linux_nat_pid_to_str (ptid_t ptid) | |
3248 | { | |
3249 | static char buf[64]; | |
3250 | ||
a0ef4274 DJ |
3251 | if (is_lwp (ptid) |
3252 | && ((lwp_list && lwp_list->next) | |
3253 | || GET_PID (ptid) != GET_LWP (ptid))) | |
d6b0e80f AC |
3254 | { |
3255 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3256 | return buf; | |
3257 | } | |
3258 | ||
3259 | return normal_pid_to_str (ptid); | |
3260 | } | |
3261 | ||
d6b0e80f AC |
3262 | static void |
3263 | sigchld_handler (int signo) | |
3264 | { | |
c6ebd6cf | 3265 | if (target_async_permitted |
84e46146 | 3266 | && linux_nat_async_events_state != sigchld_sync |
b84876c2 PA |
3267 | && signo == SIGCHLD) |
3268 | /* It is *always* a bug to hit this. */ | |
3269 | internal_error (__FILE__, __LINE__, | |
3270 | "sigchld_handler called when async events are enabled"); | |
3271 | ||
d6b0e80f AC |
3272 | /* Do nothing. The only reason for this handler is that it allows |
3273 | us to use sigsuspend in linux_nat_wait above to wait for the | |
3274 | arrival of a SIGCHLD. */ | |
3275 | } | |
3276 | ||
dba24537 AC |
3277 | /* Accepts an integer PID; Returns a string representing a file that |
3278 | can be opened to get the symbols for the child process. */ | |
3279 | ||
6d8fd2b7 UW |
3280 | static char * |
3281 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3282 | { |
3283 | char *name1, *name2; | |
3284 | ||
3285 | name1 = xmalloc (MAXPATHLEN); | |
3286 | name2 = xmalloc (MAXPATHLEN); | |
3287 | make_cleanup (xfree, name1); | |
3288 | make_cleanup (xfree, name2); | |
3289 | memset (name2, 0, MAXPATHLEN); | |
3290 | ||
3291 | sprintf (name1, "/proc/%d/exe", pid); | |
3292 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3293 | return name2; | |
3294 | else | |
3295 | return name1; | |
3296 | } | |
3297 | ||
3298 | /* Service function for corefiles and info proc. */ | |
3299 | ||
3300 | static int | |
3301 | read_mapping (FILE *mapfile, | |
3302 | long long *addr, | |
3303 | long long *endaddr, | |
3304 | char *permissions, | |
3305 | long long *offset, | |
3306 | char *device, long long *inode, char *filename) | |
3307 | { | |
3308 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3309 | addr, endaddr, permissions, offset, device, inode); | |
3310 | ||
2e14c2ea MS |
3311 | filename[0] = '\0'; |
3312 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3313 | { |
3314 | /* Eat everything up to EOL for the filename. This will prevent | |
3315 | weird filenames (such as one with embedded whitespace) from | |
3316 | confusing this code. It also makes this code more robust in | |
3317 | respect to annotations the kernel may add after the filename. | |
3318 | ||
3319 | Note the filename is used for informational purposes | |
3320 | only. */ | |
3321 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3322 | } | |
2e14c2ea | 3323 | |
dba24537 AC |
3324 | return (ret != 0 && ret != EOF); |
3325 | } | |
3326 | ||
3327 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3328 | regions in the inferior for a corefile. */ | |
3329 | ||
3330 | static int | |
3331 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3332 | unsigned long, | |
3333 | int, int, int, void *), void *obfd) | |
3334 | { | |
3335 | long long pid = PIDGET (inferior_ptid); | |
3336 | char mapsfilename[MAXPATHLEN]; | |
3337 | FILE *mapsfile; | |
3338 | long long addr, endaddr, size, offset, inode; | |
3339 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3340 | int read, write, exec; | |
3341 | int ret; | |
7c8a8b04 | 3342 | struct cleanup *cleanup; |
dba24537 AC |
3343 | |
3344 | /* Compose the filename for the /proc memory map, and open it. */ | |
3345 | sprintf (mapsfilename, "/proc/%lld/maps", pid); | |
3346 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) | |
8a3fe4f8 | 3347 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3348 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3349 | |
3350 | if (info_verbose) | |
3351 | fprintf_filtered (gdb_stdout, | |
3352 | "Reading memory regions from %s\n", mapsfilename); | |
3353 | ||
3354 | /* Now iterate until end-of-file. */ | |
3355 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3356 | &offset, &device[0], &inode, &filename[0])) | |
3357 | { | |
3358 | size = endaddr - addr; | |
3359 | ||
3360 | /* Get the segment's permissions. */ | |
3361 | read = (strchr (permissions, 'r') != 0); | |
3362 | write = (strchr (permissions, 'w') != 0); | |
3363 | exec = (strchr (permissions, 'x') != 0); | |
3364 | ||
3365 | if (info_verbose) | |
3366 | { | |
3367 | fprintf_filtered (gdb_stdout, | |
3368 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
3369 | size, paddr_nz (addr), | |
3370 | read ? 'r' : ' ', | |
3371 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3372 | if (filename[0]) |
dba24537 AC |
3373 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3374 | fprintf_filtered (gdb_stdout, "\n"); | |
3375 | } | |
3376 | ||
3377 | /* Invoke the callback function to create the corefile | |
3378 | segment. */ | |
3379 | func (addr, size, read, write, exec, obfd); | |
3380 | } | |
7c8a8b04 | 3381 | do_cleanups (cleanup); |
dba24537 AC |
3382 | return 0; |
3383 | } | |
3384 | ||
2020b7ab PA |
3385 | static int |
3386 | find_signalled_thread (struct thread_info *info, void *data) | |
3387 | { | |
3388 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3389 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3390 | return 1; | |
3391 | ||
3392 | return 0; | |
3393 | } | |
3394 | ||
3395 | static enum target_signal | |
3396 | find_stop_signal (void) | |
3397 | { | |
3398 | struct thread_info *info = | |
3399 | iterate_over_threads (find_signalled_thread, NULL); | |
3400 | ||
3401 | if (info) | |
3402 | return info->stop_signal; | |
3403 | else | |
3404 | return TARGET_SIGNAL_0; | |
3405 | } | |
3406 | ||
dba24537 AC |
3407 | /* Records the thread's register state for the corefile note |
3408 | section. */ | |
3409 | ||
3410 | static char * | |
3411 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3412 | char *note_data, int *note_size, |
3413 | enum target_signal stop_signal) | |
dba24537 AC |
3414 | { |
3415 | gdb_gregset_t gregs; | |
3416 | gdb_fpregset_t fpregs; | |
dba24537 | 3417 | unsigned long lwp = ptid_get_lwp (ptid); |
594f7785 UW |
3418 | struct regcache *regcache = get_thread_regcache (ptid); |
3419 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4f844a66 | 3420 | const struct regset *regset; |
55e969c1 | 3421 | int core_regset_p; |
594f7785 | 3422 | struct cleanup *old_chain; |
17ea7499 CES |
3423 | struct core_regset_section *sect_list; |
3424 | char *gdb_regset; | |
594f7785 UW |
3425 | |
3426 | old_chain = save_inferior_ptid (); | |
3427 | inferior_ptid = ptid; | |
3428 | target_fetch_registers (regcache, -1); | |
3429 | do_cleanups (old_chain); | |
4f844a66 DM |
3430 | |
3431 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3432 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3433 | ||
55e969c1 DM |
3434 | if (core_regset_p |
3435 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3436 | sizeof (gregs))) != NULL | |
3437 | && regset->collect_regset != NULL) | |
594f7785 | 3438 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3439 | &gregs, sizeof (gregs)); |
4f844a66 | 3440 | else |
594f7785 | 3441 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3442 | |
55e969c1 DM |
3443 | note_data = (char *) elfcore_write_prstatus (obfd, |
3444 | note_data, | |
3445 | note_size, | |
3446 | lwp, | |
3447 | stop_signal, &gregs); | |
3448 | ||
17ea7499 CES |
3449 | /* The loop below uses the new struct core_regset_section, which stores |
3450 | the supported section names and sizes for the core file. Note that | |
3451 | note PRSTATUS needs to be treated specially. But the other notes are | |
3452 | structurally the same, so they can benefit from the new struct. */ | |
3453 | if (core_regset_p && sect_list != NULL) | |
3454 | while (sect_list->sect_name != NULL) | |
3455 | { | |
3456 | /* .reg was already handled above. */ | |
3457 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3458 | { | |
3459 | sect_list++; | |
3460 | continue; | |
3461 | } | |
3462 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3463 | sect_list->sect_name, | |
3464 | sect_list->size); | |
3465 | gdb_assert (regset && regset->collect_regset); | |
3466 | gdb_regset = xmalloc (sect_list->size); | |
3467 | regset->collect_regset (regset, regcache, -1, | |
3468 | gdb_regset, sect_list->size); | |
3469 | note_data = (char *) elfcore_write_register_note (obfd, | |
3470 | note_data, | |
3471 | note_size, | |
3472 | sect_list->sect_name, | |
3473 | gdb_regset, | |
3474 | sect_list->size); | |
3475 | xfree (gdb_regset); | |
3476 | sect_list++; | |
3477 | } | |
dba24537 | 3478 | |
17ea7499 CES |
3479 | /* For architectures that does not have the struct core_regset_section |
3480 | implemented, we use the old method. When all the architectures have | |
3481 | the new support, the code below should be deleted. */ | |
4f844a66 | 3482 | else |
17ea7499 CES |
3483 | { |
3484 | if (core_regset_p | |
3485 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3486 | sizeof (fpregs))) != NULL | |
3487 | && regset->collect_regset != NULL) | |
3488 | regset->collect_regset (regset, regcache, -1, | |
3489 | &fpregs, sizeof (fpregs)); | |
3490 | else | |
3491 | fill_fpregset (regcache, &fpregs, -1); | |
3492 | ||
3493 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3494 | note_data, | |
3495 | note_size, | |
3496 | &fpregs, sizeof (fpregs)); | |
3497 | } | |
4f844a66 | 3498 | |
dba24537 AC |
3499 | return note_data; |
3500 | } | |
3501 | ||
3502 | struct linux_nat_corefile_thread_data | |
3503 | { | |
3504 | bfd *obfd; | |
3505 | char *note_data; | |
3506 | int *note_size; | |
3507 | int num_notes; | |
2020b7ab | 3508 | enum target_signal stop_signal; |
dba24537 AC |
3509 | }; |
3510 | ||
3511 | /* Called by gdbthread.c once per thread. Records the thread's | |
3512 | register state for the corefile note section. */ | |
3513 | ||
3514 | static int | |
3515 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3516 | { | |
3517 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3518 | |
dba24537 AC |
3519 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3520 | ti->ptid, | |
3521 | args->note_data, | |
2020b7ab PA |
3522 | args->note_size, |
3523 | args->stop_signal); | |
dba24537 | 3524 | args->num_notes++; |
56be3814 | 3525 | |
dba24537 AC |
3526 | return 0; |
3527 | } | |
3528 | ||
dba24537 AC |
3529 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3530 | section for a corefile, and returns it in a malloc buffer. */ | |
3531 | ||
3532 | static char * | |
3533 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3534 | { | |
3535 | struct linux_nat_corefile_thread_data thread_args; | |
3536 | struct cleanup *old_chain; | |
d99148ef | 3537 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3538 | char fname[16] = { '\0' }; |
d99148ef | 3539 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3540 | char psargs[80] = { '\0' }; |
3541 | char *note_data = NULL; | |
3542 | ptid_t current_ptid = inferior_ptid; | |
c6826062 | 3543 | gdb_byte *auxv; |
dba24537 AC |
3544 | int auxv_len; |
3545 | ||
3546 | if (get_exec_file (0)) | |
3547 | { | |
3548 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3549 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3550 | if (get_inferior_args ()) | |
3551 | { | |
d99148ef JK |
3552 | char *string_end; |
3553 | char *psargs_end = psargs + sizeof (psargs); | |
3554 | ||
3555 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3556 | strings fine. */ | |
3557 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3558 | if (string_end != NULL) | |
3559 | { | |
3560 | *string_end++ = ' '; | |
3561 | strncpy (string_end, get_inferior_args (), | |
3562 | psargs_end - string_end); | |
3563 | } | |
dba24537 AC |
3564 | } |
3565 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3566 | note_data, | |
3567 | note_size, fname, psargs); | |
3568 | } | |
3569 | ||
3570 | /* Dump information for threads. */ | |
3571 | thread_args.obfd = obfd; | |
3572 | thread_args.note_data = note_data; | |
3573 | thread_args.note_size = note_size; | |
3574 | thread_args.num_notes = 0; | |
2020b7ab | 3575 | thread_args.stop_signal = find_stop_signal (); |
dba24537 | 3576 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3577 | gdb_assert (thread_args.num_notes != 0); |
3578 | note_data = thread_args.note_data; | |
dba24537 | 3579 | |
13547ab6 DJ |
3580 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3581 | NULL, &auxv); | |
dba24537 AC |
3582 | if (auxv_len > 0) |
3583 | { | |
3584 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3585 | "CORE", NT_AUXV, auxv, auxv_len); | |
3586 | xfree (auxv); | |
3587 | } | |
3588 | ||
3589 | make_cleanup (xfree, note_data); | |
3590 | return note_data; | |
3591 | } | |
3592 | ||
3593 | /* Implement the "info proc" command. */ | |
3594 | ||
3595 | static void | |
3596 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3597 | { | |
3598 | long long pid = PIDGET (inferior_ptid); | |
3599 | FILE *procfile; | |
3600 | char **argv = NULL; | |
3601 | char buffer[MAXPATHLEN]; | |
3602 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3603 | int cmdline_f = 1; | |
3604 | int cwd_f = 1; | |
3605 | int exe_f = 1; | |
3606 | int mappings_f = 0; | |
3607 | int environ_f = 0; | |
3608 | int status_f = 0; | |
3609 | int stat_f = 0; | |
3610 | int all = 0; | |
3611 | struct stat dummy; | |
3612 | ||
3613 | if (args) | |
3614 | { | |
3615 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
3616 | argv = gdb_buildargv (args); |
3617 | make_cleanup_freeargv (argv); | |
dba24537 AC |
3618 | } |
3619 | while (argv != NULL && *argv != NULL) | |
3620 | { | |
3621 | if (isdigit (argv[0][0])) | |
3622 | { | |
3623 | pid = strtoul (argv[0], NULL, 10); | |
3624 | } | |
3625 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
3626 | { | |
3627 | mappings_f = 1; | |
3628 | } | |
3629 | else if (strcmp (argv[0], "status") == 0) | |
3630 | { | |
3631 | status_f = 1; | |
3632 | } | |
3633 | else if (strcmp (argv[0], "stat") == 0) | |
3634 | { | |
3635 | stat_f = 1; | |
3636 | } | |
3637 | else if (strcmp (argv[0], "cmd") == 0) | |
3638 | { | |
3639 | cmdline_f = 1; | |
3640 | } | |
3641 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
3642 | { | |
3643 | exe_f = 1; | |
3644 | } | |
3645 | else if (strcmp (argv[0], "cwd") == 0) | |
3646 | { | |
3647 | cwd_f = 1; | |
3648 | } | |
3649 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
3650 | { | |
3651 | all = 1; | |
3652 | } | |
3653 | else | |
3654 | { | |
3655 | /* [...] (future options here) */ | |
3656 | } | |
3657 | argv++; | |
3658 | } | |
3659 | if (pid == 0) | |
8a3fe4f8 | 3660 | error (_("No current process: you must name one.")); |
dba24537 AC |
3661 | |
3662 | sprintf (fname1, "/proc/%lld", pid); | |
3663 | if (stat (fname1, &dummy) != 0) | |
8a3fe4f8 | 3664 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 3665 | |
a3f17187 | 3666 | printf_filtered (_("process %lld\n"), pid); |
dba24537 AC |
3667 | if (cmdline_f || all) |
3668 | { | |
3669 | sprintf (fname1, "/proc/%lld/cmdline", pid); | |
d5d6fca5 | 3670 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3671 | { |
7c8a8b04 | 3672 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3673 | fgets (buffer, sizeof (buffer), procfile); |
3674 | printf_filtered ("cmdline = '%s'\n", buffer); | |
7c8a8b04 | 3675 | do_cleanups (cleanup); |
dba24537 AC |
3676 | } |
3677 | else | |
8a3fe4f8 | 3678 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3679 | } |
3680 | if (cwd_f || all) | |
3681 | { | |
3682 | sprintf (fname1, "/proc/%lld/cwd", pid); | |
3683 | memset (fname2, 0, sizeof (fname2)); | |
3684 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3685 | printf_filtered ("cwd = '%s'\n", fname2); | |
3686 | else | |
8a3fe4f8 | 3687 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3688 | } |
3689 | if (exe_f || all) | |
3690 | { | |
3691 | sprintf (fname1, "/proc/%lld/exe", pid); | |
3692 | memset (fname2, 0, sizeof (fname2)); | |
3693 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3694 | printf_filtered ("exe = '%s'\n", fname2); | |
3695 | else | |
8a3fe4f8 | 3696 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3697 | } |
3698 | if (mappings_f || all) | |
3699 | { | |
3700 | sprintf (fname1, "/proc/%lld/maps", pid); | |
d5d6fca5 | 3701 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3702 | { |
3703 | long long addr, endaddr, size, offset, inode; | |
3704 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 3705 | struct cleanup *cleanup; |
dba24537 | 3706 | |
7c8a8b04 | 3707 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 3708 | printf_filtered (_("Mapped address spaces:\n\n")); |
17a912b6 | 3709 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3710 | { |
3711 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
3712 | "Start Addr", | |
3713 | " End Addr", | |
3714 | " Size", " Offset", "objfile"); | |
3715 | } | |
3716 | else | |
3717 | { | |
3718 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
3719 | "Start Addr", | |
3720 | " End Addr", | |
3721 | " Size", " Offset", "objfile"); | |
3722 | } | |
3723 | ||
3724 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
3725 | &offset, &device[0], &inode, &filename[0])) | |
3726 | { | |
3727 | size = endaddr - addr; | |
3728 | ||
3729 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
3730 | calls here (and possibly above) should be abstracted | |
3731 | out into their own functions? Andrew suggests using | |
3732 | a generic local_address_string instead to print out | |
3733 | the addresses; that makes sense to me, too. */ | |
3734 | ||
17a912b6 | 3735 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3736 | { |
3737 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
3738 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3739 | (unsigned long) endaddr, | |
3740 | (int) size, | |
3741 | (unsigned int) offset, | |
3742 | filename[0] ? filename : ""); | |
3743 | } | |
3744 | else | |
3745 | { | |
3746 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
3747 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3748 | (unsigned long) endaddr, | |
3749 | (int) size, | |
3750 | (unsigned int) offset, | |
3751 | filename[0] ? filename : ""); | |
3752 | } | |
3753 | } | |
3754 | ||
7c8a8b04 | 3755 | do_cleanups (cleanup); |
dba24537 AC |
3756 | } |
3757 | else | |
8a3fe4f8 | 3758 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3759 | } |
3760 | if (status_f || all) | |
3761 | { | |
3762 | sprintf (fname1, "/proc/%lld/status", pid); | |
d5d6fca5 | 3763 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3764 | { |
7c8a8b04 | 3765 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3766 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
3767 | puts_filtered (buffer); | |
7c8a8b04 | 3768 | do_cleanups (cleanup); |
dba24537 AC |
3769 | } |
3770 | else | |
8a3fe4f8 | 3771 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3772 | } |
3773 | if (stat_f || all) | |
3774 | { | |
3775 | sprintf (fname1, "/proc/%lld/stat", pid); | |
d5d6fca5 | 3776 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3777 | { |
3778 | int itmp; | |
3779 | char ctmp; | |
a25694b4 | 3780 | long ltmp; |
7c8a8b04 | 3781 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3782 | |
3783 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3784 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 3785 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 3786 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 3787 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 3788 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 3789 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3790 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 3791 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3792 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 3793 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3794 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3795 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3796 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3797 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3798 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
3799 | if (fscanf (procfile, "%lu ", <mp) > 0) |
3800 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
3801 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3802 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
3803 | (unsigned long) ltmp); | |
3804 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3805 | printf_filtered (_("Minor faults, children: %lu\n"), | |
3806 | (unsigned long) ltmp); | |
3807 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3808 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
3809 | (unsigned long) ltmp); | |
3810 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3811 | printf_filtered (_("Major faults, children: %lu\n"), | |
3812 | (unsigned long) ltmp); | |
3813 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3814 | printf_filtered (_("utime: %ld\n"), ltmp); | |
3815 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3816 | printf_filtered (_("stime: %ld\n"), ltmp); | |
3817 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3818 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
3819 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3820 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
3821 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3822 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
3823 | ltmp); | |
3824 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3825 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
3826 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3827 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
3828 | (unsigned long) ltmp); | |
3829 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3830 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
3831 | (unsigned long) ltmp); | |
3832 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3833 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
3834 | ltmp); | |
3835 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3836 | printf_filtered (_("Virtual memory size: %lu\n"), | |
3837 | (unsigned long) ltmp); | |
3838 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3839 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
3840 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3841 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
3842 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3843 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
3844 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3845 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
3846 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3847 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
3848 | #if 0 /* Don't know how architecture-dependent the rest is... |
3849 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
3850 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
3851 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
3852 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3853 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
3854 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3855 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
3856 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3857 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
3858 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3859 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
3860 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3861 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
3862 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3863 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 3864 | #endif |
7c8a8b04 | 3865 | do_cleanups (cleanup); |
dba24537 AC |
3866 | } |
3867 | else | |
8a3fe4f8 | 3868 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3869 | } |
3870 | } | |
3871 | ||
10d6c8cd DJ |
3872 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3873 | filesystem. Because we can use a single read() call for /proc, this | |
3874 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3875 | but it doesn't support writes. */ | |
3876 | ||
3877 | static LONGEST | |
3878 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3879 | const char *annex, gdb_byte *readbuf, | |
3880 | const gdb_byte *writebuf, | |
3881 | ULONGEST offset, LONGEST len) | |
dba24537 | 3882 | { |
10d6c8cd DJ |
3883 | LONGEST ret; |
3884 | int fd; | |
dba24537 AC |
3885 | char filename[64]; |
3886 | ||
10d6c8cd | 3887 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
3888 | return 0; |
3889 | ||
3890 | /* Don't bother for one word. */ | |
3891 | if (len < 3 * sizeof (long)) | |
3892 | return 0; | |
3893 | ||
3894 | /* We could keep this file open and cache it - possibly one per | |
3895 | thread. That requires some juggling, but is even faster. */ | |
3896 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
3897 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
3898 | if (fd == -1) | |
3899 | return 0; | |
3900 | ||
3901 | /* If pread64 is available, use it. It's faster if the kernel | |
3902 | supports it (only one syscall), and it's 64-bit safe even on | |
3903 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3904 | application). */ | |
3905 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 3906 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 3907 | #else |
10d6c8cd | 3908 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
3909 | #endif |
3910 | ret = 0; | |
3911 | else | |
3912 | ret = len; | |
3913 | ||
3914 | close (fd); | |
3915 | return ret; | |
3916 | } | |
3917 | ||
3918 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
3919 | ||
3920 | static void | |
3921 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
3922 | { | |
3923 | int len = strlen (line) - 1; | |
3924 | const char *p; | |
3925 | int signum; | |
3926 | ||
3927 | if (line[len] != '\n') | |
8a3fe4f8 | 3928 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3929 | |
3930 | p = line; | |
3931 | signum = len * 4; | |
3932 | while (len-- > 0) | |
3933 | { | |
3934 | int digit; | |
3935 | ||
3936 | if (*p >= '0' && *p <= '9') | |
3937 | digit = *p - '0'; | |
3938 | else if (*p >= 'a' && *p <= 'f') | |
3939 | digit = *p - 'a' + 10; | |
3940 | else | |
8a3fe4f8 | 3941 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3942 | |
3943 | signum -= 4; | |
3944 | ||
3945 | if (digit & 1) | |
3946 | sigaddset (sigs, signum + 1); | |
3947 | if (digit & 2) | |
3948 | sigaddset (sigs, signum + 2); | |
3949 | if (digit & 4) | |
3950 | sigaddset (sigs, signum + 3); | |
3951 | if (digit & 8) | |
3952 | sigaddset (sigs, signum + 4); | |
3953 | ||
3954 | p++; | |
3955 | } | |
3956 | } | |
3957 | ||
3958 | /* Find process PID's pending signals from /proc/pid/status and set | |
3959 | SIGS to match. */ | |
3960 | ||
3961 | void | |
3962 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
3963 | { | |
3964 | FILE *procfile; | |
3965 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
3966 | int signum; | |
7c8a8b04 | 3967 | struct cleanup *cleanup; |
dba24537 AC |
3968 | |
3969 | sigemptyset (pending); | |
3970 | sigemptyset (blocked); | |
3971 | sigemptyset (ignored); | |
3972 | sprintf (fname, "/proc/%d/status", pid); | |
3973 | procfile = fopen (fname, "r"); | |
3974 | if (procfile == NULL) | |
8a3fe4f8 | 3975 | error (_("Could not open %s"), fname); |
7c8a8b04 | 3976 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3977 | |
3978 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
3979 | { | |
3980 | /* Normal queued signals are on the SigPnd line in the status | |
3981 | file. However, 2.6 kernels also have a "shared" pending | |
3982 | queue for delivering signals to a thread group, so check for | |
3983 | a ShdPnd line also. | |
3984 | ||
3985 | Unfortunately some Red Hat kernels include the shared pending | |
3986 | queue but not the ShdPnd status field. */ | |
3987 | ||
3988 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
3989 | add_line_to_sigset (buffer + 8, pending); | |
3990 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
3991 | add_line_to_sigset (buffer + 8, pending); | |
3992 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
3993 | add_line_to_sigset (buffer + 8, blocked); | |
3994 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
3995 | add_line_to_sigset (buffer + 8, ignored); | |
3996 | } | |
3997 | ||
7c8a8b04 | 3998 | do_cleanups (cleanup); |
dba24537 AC |
3999 | } |
4000 | ||
07e059b5 VP |
4001 | static LONGEST |
4002 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4003 | const char *annex, gdb_byte *readbuf, | |
4004 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4005 | { | |
4006 | /* We make the process list snapshot when the object starts to be | |
4007 | read. */ | |
4008 | static const char *buf; | |
4009 | static LONGEST len_avail = -1; | |
4010 | static struct obstack obstack; | |
4011 | ||
4012 | DIR *dirp; | |
4013 | ||
4014 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4015 | ||
4016 | if (strcmp (annex, "processes") != 0) | |
4017 | return 0; | |
4018 | ||
4019 | gdb_assert (readbuf && !writebuf); | |
4020 | ||
4021 | if (offset == 0) | |
4022 | { | |
4023 | if (len_avail != -1 && len_avail != 0) | |
4024 | obstack_free (&obstack, NULL); | |
4025 | len_avail = 0; | |
4026 | buf = NULL; | |
4027 | obstack_init (&obstack); | |
4028 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4029 | ||
4030 | dirp = opendir ("/proc"); | |
4031 | if (dirp) | |
4032 | { | |
4033 | struct dirent *dp; | |
4034 | while ((dp = readdir (dirp)) != NULL) | |
4035 | { | |
4036 | struct stat statbuf; | |
4037 | char procentry[sizeof ("/proc/4294967295")]; | |
4038 | ||
4039 | if (!isdigit (dp->d_name[0]) | |
4040 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
4041 | continue; | |
4042 | ||
4043 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4044 | if (stat (procentry, &statbuf) == 0 | |
4045 | && S_ISDIR (statbuf.st_mode)) | |
4046 | { | |
4047 | char *pathname; | |
4048 | FILE *f; | |
4049 | char cmd[MAXPATHLEN + 1]; | |
4050 | struct passwd *entry; | |
4051 | ||
4052 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4053 | entry = getpwuid (statbuf.st_uid); | |
4054 | ||
4055 | if ((f = fopen (pathname, "r")) != NULL) | |
4056 | { | |
4057 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4058 | if (len > 0) | |
4059 | { | |
4060 | int i; | |
4061 | for (i = 0; i < len; i++) | |
4062 | if (cmd[i] == '\0') | |
4063 | cmd[i] = ' '; | |
4064 | cmd[len] = '\0'; | |
4065 | ||
4066 | obstack_xml_printf ( | |
4067 | &obstack, | |
4068 | "<item>" | |
4069 | "<column name=\"pid\">%s</column>" | |
4070 | "<column name=\"user\">%s</column>" | |
4071 | "<column name=\"command\">%s</column>" | |
4072 | "</item>", | |
4073 | dp->d_name, | |
4074 | entry ? entry->pw_name : "?", | |
4075 | cmd); | |
4076 | } | |
4077 | fclose (f); | |
4078 | } | |
4079 | ||
4080 | xfree (pathname); | |
4081 | } | |
4082 | } | |
4083 | ||
4084 | closedir (dirp); | |
4085 | } | |
4086 | ||
4087 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4088 | buf = obstack_finish (&obstack); | |
4089 | len_avail = strlen (buf); | |
4090 | } | |
4091 | ||
4092 | if (offset >= len_avail) | |
4093 | { | |
4094 | /* Done. Get rid of the obstack. */ | |
4095 | obstack_free (&obstack, NULL); | |
4096 | buf = NULL; | |
4097 | len_avail = 0; | |
4098 | return 0; | |
4099 | } | |
4100 | ||
4101 | if (len > len_avail - offset) | |
4102 | len = len_avail - offset; | |
4103 | memcpy (readbuf, buf + offset, len); | |
4104 | ||
4105 | return len; | |
4106 | } | |
4107 | ||
10d6c8cd DJ |
4108 | static LONGEST |
4109 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4110 | const char *annex, gdb_byte *readbuf, | |
4111 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4112 | { | |
4113 | LONGEST xfer; | |
4114 | ||
4115 | if (object == TARGET_OBJECT_AUXV) | |
4116 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4117 | offset, len); | |
4118 | ||
07e059b5 VP |
4119 | if (object == TARGET_OBJECT_OSDATA) |
4120 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4121 | offset, len); | |
4122 | ||
10d6c8cd DJ |
4123 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4124 | offset, len); | |
4125 | if (xfer != 0) | |
4126 | return xfer; | |
4127 | ||
4128 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4129 | offset, len); | |
4130 | } | |
4131 | ||
e9efe249 | 4132 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4133 | it with local methods. */ |
4134 | ||
910122bf UW |
4135 | static void |
4136 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4137 | { |
6d8fd2b7 UW |
4138 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4139 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4140 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
4141 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; | |
10d6c8cd | 4142 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4143 | t->to_post_attach = linux_child_post_attach; |
4144 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4145 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4146 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4147 | ||
4148 | super_xfer_partial = t->to_xfer_partial; | |
4149 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4150 | } |
4151 | ||
4152 | struct target_ops * | |
4153 | linux_target (void) | |
4154 | { | |
4155 | struct target_ops *t; | |
4156 | ||
4157 | t = inf_ptrace_target (); | |
4158 | linux_target_install_ops (t); | |
4159 | ||
4160 | return t; | |
4161 | } | |
4162 | ||
4163 | struct target_ops * | |
7714d83a | 4164 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4165 | { |
4166 | struct target_ops *t; | |
4167 | ||
4168 | t = inf_ptrace_trad_target (register_u_offset); | |
4169 | linux_target_install_ops (t); | |
10d6c8cd | 4170 | |
10d6c8cd DJ |
4171 | return t; |
4172 | } | |
4173 | ||
b84876c2 PA |
4174 | /* target_is_async_p implementation. */ |
4175 | ||
4176 | static int | |
4177 | linux_nat_is_async_p (void) | |
4178 | { | |
4179 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
c6ebd6cf | 4180 | it explicitly with the "maintenance set target-async" command. |
b84876c2 | 4181 | Someday, linux will always be async. */ |
c6ebd6cf | 4182 | if (!target_async_permitted) |
b84876c2 PA |
4183 | return 0; |
4184 | ||
4185 | return 1; | |
4186 | } | |
4187 | ||
4188 | /* target_can_async_p implementation. */ | |
4189 | ||
4190 | static int | |
4191 | linux_nat_can_async_p (void) | |
4192 | { | |
4193 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
c6ebd6cf | 4194 | it explicitly with the "maintenance set target-async" command. |
b84876c2 | 4195 | Someday, linux will always be async. */ |
c6ebd6cf | 4196 | if (!target_async_permitted) |
b84876c2 PA |
4197 | return 0; |
4198 | ||
4199 | /* See target.h/target_async_mask. */ | |
4200 | return linux_nat_async_mask_value; | |
4201 | } | |
4202 | ||
9908b566 VP |
4203 | static int |
4204 | linux_nat_supports_non_stop (void) | |
4205 | { | |
4206 | return 1; | |
4207 | } | |
4208 | ||
b84876c2 PA |
4209 | /* target_async_mask implementation. */ |
4210 | ||
4211 | static int | |
4212 | linux_nat_async_mask (int mask) | |
4213 | { | |
4214 | int current_state; | |
4215 | current_state = linux_nat_async_mask_value; | |
4216 | ||
4217 | if (current_state != mask) | |
4218 | { | |
4219 | if (mask == 0) | |
4220 | { | |
4221 | linux_nat_async (NULL, 0); | |
4222 | linux_nat_async_mask_value = mask; | |
b84876c2 PA |
4223 | } |
4224 | else | |
4225 | { | |
b84876c2 PA |
4226 | linux_nat_async_mask_value = mask; |
4227 | linux_nat_async (inferior_event_handler, 0); | |
4228 | } | |
4229 | } | |
4230 | ||
4231 | return current_state; | |
4232 | } | |
4233 | ||
4234 | /* Pop an event from the event pipe. */ | |
4235 | ||
4236 | static int | |
4237 | linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options) | |
4238 | { | |
4239 | struct waitpid_result event = {0}; | |
4240 | int ret; | |
4241 | ||
4242 | do | |
4243 | { | |
4244 | ret = read (linux_nat_event_pipe[0], &event, sizeof (event)); | |
4245 | } | |
4246 | while (ret == -1 && errno == EINTR); | |
4247 | ||
4248 | gdb_assert (ret == sizeof (event)); | |
4249 | ||
4250 | *ptr_status = event.status; | |
4251 | *ptr_options = event.options; | |
4252 | ||
4253 | linux_nat_num_queued_events--; | |
4254 | ||
4255 | return event.pid; | |
4256 | } | |
4257 | ||
4258 | /* Push an event into the event pipe. */ | |
4259 | ||
4260 | static void | |
4261 | linux_nat_event_pipe_push (int pid, int status, int options) | |
4262 | { | |
4263 | int ret; | |
4264 | struct waitpid_result event = {0}; | |
4265 | event.pid = pid; | |
4266 | event.status = status; | |
4267 | event.options = options; | |
4268 | ||
4269 | do | |
4270 | { | |
4271 | ret = write (linux_nat_event_pipe[1], &event, sizeof (event)); | |
4272 | gdb_assert ((ret == -1 && errno == EINTR) || ret == sizeof (event)); | |
4273 | } while (ret == -1 && errno == EINTR); | |
4274 | ||
4275 | linux_nat_num_queued_events++; | |
4276 | } | |
4277 | ||
4278 | static void | |
4279 | get_pending_events (void) | |
4280 | { | |
4281 | int status, options, pid; | |
4282 | ||
c6ebd6cf | 4283 | if (!target_async_permitted |
84e46146 | 4284 | || linux_nat_async_events_state != sigchld_async) |
b84876c2 PA |
4285 | internal_error (__FILE__, __LINE__, |
4286 | "get_pending_events called with async masked"); | |
4287 | ||
4288 | while (1) | |
4289 | { | |
4290 | status = 0; | |
4291 | options = __WCLONE | WNOHANG; | |
4292 | ||
4293 | do | |
4294 | { | |
4295 | pid = waitpid (-1, &status, options); | |
4296 | } | |
4297 | while (pid == -1 && errno == EINTR); | |
4298 | ||
4299 | if (pid <= 0) | |
4300 | { | |
4301 | options = WNOHANG; | |
4302 | do | |
4303 | { | |
4304 | pid = waitpid (-1, &status, options); | |
4305 | } | |
4306 | while (pid == -1 && errno == EINTR); | |
4307 | } | |
4308 | ||
4309 | if (pid <= 0) | |
4310 | /* No more children reporting events. */ | |
4311 | break; | |
4312 | ||
4313 | if (debug_linux_nat_async) | |
4314 | fprintf_unfiltered (gdb_stdlog, "\ | |
4315 | get_pending_events: pid(%d), status(%x), options (%x)\n", | |
4316 | pid, status, options); | |
4317 | ||
4318 | linux_nat_event_pipe_push (pid, status, options); | |
4319 | } | |
4320 | ||
4321 | if (debug_linux_nat_async) | |
4322 | fprintf_unfiltered (gdb_stdlog, "\ | |
4323 | get_pending_events: linux_nat_num_queued_events(%d)\n", | |
4324 | linux_nat_num_queued_events); | |
4325 | } | |
4326 | ||
4327 | /* SIGCHLD handler for async mode. */ | |
4328 | ||
4329 | static void | |
4330 | async_sigchld_handler (int signo) | |
4331 | { | |
4332 | if (debug_linux_nat_async) | |
4333 | fprintf_unfiltered (gdb_stdlog, "async_sigchld_handler\n"); | |
4334 | ||
4335 | get_pending_events (); | |
4336 | } | |
4337 | ||
84e46146 | 4338 | /* Set SIGCHLD handling state to STATE. Returns previous state. */ |
b84876c2 | 4339 | |
84e46146 PA |
4340 | static enum sigchld_state |
4341 | linux_nat_async_events (enum sigchld_state state) | |
b84876c2 | 4342 | { |
84e46146 | 4343 | enum sigchld_state current_state = linux_nat_async_events_state; |
b84876c2 PA |
4344 | |
4345 | if (debug_linux_nat_async) | |
4346 | fprintf_unfiltered (gdb_stdlog, | |
84e46146 | 4347 | "LNAE: state(%d): linux_nat_async_events_state(%d), " |
b84876c2 | 4348 | "linux_nat_num_queued_events(%d)\n", |
84e46146 | 4349 | state, linux_nat_async_events_state, |
b84876c2 PA |
4350 | linux_nat_num_queued_events); |
4351 | ||
84e46146 | 4352 | if (current_state != state) |
b84876c2 PA |
4353 | { |
4354 | sigset_t mask; | |
4355 | sigemptyset (&mask); | |
4356 | sigaddset (&mask, SIGCHLD); | |
84e46146 PA |
4357 | |
4358 | /* Always block before changing state. */ | |
4359 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4360 | ||
4361 | /* Set new state. */ | |
4362 | linux_nat_async_events_state = state; | |
4363 | ||
4364 | switch (state) | |
b84876c2 | 4365 | { |
84e46146 PA |
4366 | case sigchld_sync: |
4367 | { | |
4368 | /* Block target events. */ | |
4369 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4370 | sigaction (SIGCHLD, &sync_sigchld_action, NULL); | |
4371 | /* Get events out of queue, and make them available to | |
4372 | queued_waitpid / my_waitpid. */ | |
4373 | pipe_to_local_event_queue (); | |
4374 | } | |
4375 | break; | |
4376 | case sigchld_async: | |
4377 | { | |
4378 | /* Unblock target events for async mode. */ | |
4379 | ||
4380 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4381 | ||
4382 | /* Put events we already waited on, in the pipe first, so | |
4383 | events are FIFO. */ | |
4384 | local_event_queue_to_pipe (); | |
4385 | /* While in masked async, we may have not collected all | |
4386 | the pending events. Get them out now. */ | |
4387 | get_pending_events (); | |
4388 | ||
4389 | /* Let'em come. */ | |
4390 | sigaction (SIGCHLD, &async_sigchld_action, NULL); | |
4391 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4392 | } | |
4393 | break; | |
4394 | case sigchld_default: | |
4395 | { | |
4396 | /* SIGCHLD default mode. */ | |
4397 | sigaction (SIGCHLD, &sigchld_default_action, NULL); | |
4398 | ||
4399 | /* Get events out of queue, and make them available to | |
4400 | queued_waitpid / my_waitpid. */ | |
4401 | pipe_to_local_event_queue (); | |
4402 | ||
4403 | /* Unblock SIGCHLD. */ | |
4404 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4405 | } | |
4406 | break; | |
b84876c2 PA |
4407 | } |
4408 | } | |
4409 | ||
4410 | return current_state; | |
4411 | } | |
4412 | ||
4413 | static int async_terminal_is_ours = 1; | |
4414 | ||
4415 | /* target_terminal_inferior implementation. */ | |
4416 | ||
4417 | static void | |
4418 | linux_nat_terminal_inferior (void) | |
4419 | { | |
4420 | if (!target_is_async_p ()) | |
4421 | { | |
4422 | /* Async mode is disabled. */ | |
4423 | terminal_inferior (); | |
4424 | return; | |
4425 | } | |
4426 | ||
4427 | /* GDB should never give the terminal to the inferior, if the | |
4428 | inferior is running in the background (run&, continue&, etc.). | |
4429 | This check can be removed when the common code is fixed. */ | |
4430 | if (!sync_execution) | |
4431 | return; | |
4432 | ||
4433 | terminal_inferior (); | |
4434 | ||
4435 | if (!async_terminal_is_ours) | |
4436 | return; | |
4437 | ||
4438 | delete_file_handler (input_fd); | |
4439 | async_terminal_is_ours = 0; | |
4440 | set_sigint_trap (); | |
4441 | } | |
4442 | ||
4443 | /* target_terminal_ours implementation. */ | |
4444 | ||
4445 | void | |
4446 | linux_nat_terminal_ours (void) | |
4447 | { | |
4448 | if (!target_is_async_p ()) | |
4449 | { | |
4450 | /* Async mode is disabled. */ | |
4451 | terminal_ours (); | |
4452 | return; | |
4453 | } | |
4454 | ||
4455 | /* GDB should never give the terminal to the inferior if the | |
4456 | inferior is running in the background (run&, continue&, etc.), | |
4457 | but claiming it sure should. */ | |
4458 | terminal_ours (); | |
4459 | ||
4460 | if (!sync_execution) | |
4461 | return; | |
4462 | ||
4463 | if (async_terminal_is_ours) | |
4464 | return; | |
4465 | ||
4466 | clear_sigint_trap (); | |
4467 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4468 | async_terminal_is_ours = 1; | |
4469 | } | |
4470 | ||
4471 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4472 | void *context); | |
4473 | static void *async_client_context; | |
4474 | ||
4475 | static void | |
4476 | linux_nat_async_file_handler (int error, gdb_client_data client_data) | |
4477 | { | |
4478 | async_client_callback (INF_REG_EVENT, async_client_context); | |
4479 | } | |
4480 | ||
4481 | /* target_async implementation. */ | |
4482 | ||
4483 | static void | |
4484 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4485 | void *context), void *context) | |
4486 | { | |
c6ebd6cf | 4487 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4488 | internal_error (__FILE__, __LINE__, |
4489 | "Calling target_async when async is masked"); | |
4490 | ||
4491 | if (callback != NULL) | |
4492 | { | |
4493 | async_client_callback = callback; | |
4494 | async_client_context = context; | |
4495 | add_file_handler (linux_nat_event_pipe[0], | |
4496 | linux_nat_async_file_handler, NULL); | |
4497 | ||
84e46146 | 4498 | linux_nat_async_events (sigchld_async); |
b84876c2 PA |
4499 | } |
4500 | else | |
4501 | { | |
4502 | async_client_callback = callback; | |
4503 | async_client_context = context; | |
4504 | ||
84e46146 | 4505 | linux_nat_async_events (sigchld_sync); |
b84876c2 PA |
4506 | delete_file_handler (linux_nat_event_pipe[0]); |
4507 | } | |
4508 | return; | |
4509 | } | |
4510 | ||
252fbfc8 PA |
4511 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4512 | event came out. */ | |
4513 | ||
4c28f408 | 4514 | static int |
252fbfc8 | 4515 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4516 | { |
252fbfc8 PA |
4517 | ptid_t ptid = * (ptid_t *) data; |
4518 | ||
4519 | if (ptid_equal (lwp->ptid, ptid) | |
4520 | || ptid_equal (minus_one_ptid, ptid) | |
4521 | || (ptid_is_pid (ptid) | |
4522 | && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid))) | |
4523 | { | |
4524 | if (!lwp->stopped) | |
4525 | { | |
4526 | int pid, status; | |
4527 | ||
4528 | if (debug_linux_nat) | |
4529 | fprintf_unfiltered (gdb_stdlog, | |
4530 | "LNSL: running -> suspending %s\n", | |
4531 | target_pid_to_str (lwp->ptid)); | |
4532 | ||
4533 | /* Peek once, to check if we've already waited for this | |
4534 | LWP. */ | |
4535 | pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status, | |
4536 | lwp->cloned ? __WCLONE : 0, 1 /* peek */); | |
4537 | ||
4538 | if (pid == -1) | |
4539 | { | |
4540 | ptid_t ptid = lwp->ptid; | |
4541 | ||
4542 | stop_callback (lwp, NULL); | |
4543 | stop_wait_callback (lwp, NULL); | |
4544 | ||
4545 | /* If the lwp exits while we try to stop it, there's | |
4546 | nothing else to do. */ | |
4547 | lwp = find_lwp_pid (ptid); | |
4548 | if (lwp == NULL) | |
4549 | return 0; | |
4550 | ||
4551 | pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status, | |
4552 | lwp->cloned ? __WCLONE : 0, | |
4553 | 1 /* peek */); | |
4554 | } | |
4555 | ||
4556 | /* If we didn't collect any signal other than SIGSTOP while | |
4557 | stopping the LWP, push a SIGNAL_0 event. In either case, | |
4558 | the event-loop will end up calling target_wait which will | |
4559 | collect these. */ | |
4560 | if (pid == -1) | |
4561 | push_waitpid (ptid_get_lwp (lwp->ptid), W_STOPCODE (0), | |
4562 | lwp->cloned ? __WCLONE : 0); | |
4563 | } | |
4564 | else | |
4565 | { | |
4566 | /* Already known to be stopped; do nothing. */ | |
4567 | ||
4568 | if (debug_linux_nat) | |
4569 | { | |
4570 | if (find_thread_pid (lwp->ptid)->stop_requested) | |
4571 | fprintf_unfiltered (gdb_stdlog, "\ | |
4572 | LNSL: already stopped/stop_requested %s\n", | |
4573 | target_pid_to_str (lwp->ptid)); | |
4574 | else | |
4575 | fprintf_unfiltered (gdb_stdlog, "\ | |
4576 | LNSL: already stopped/no stop_requested yet %s\n", | |
4577 | target_pid_to_str (lwp->ptid)); | |
4578 | } | |
4579 | } | |
4580 | } | |
4c28f408 PA |
4581 | return 0; |
4582 | } | |
4583 | ||
4584 | static void | |
4585 | linux_nat_stop (ptid_t ptid) | |
4586 | { | |
4587 | if (non_stop) | |
4588 | { | |
252fbfc8 PA |
4589 | linux_nat_async_events (sigchld_sync); |
4590 | iterate_over_lwps (linux_nat_stop_lwp, &ptid); | |
4591 | target_async (inferior_event_handler, 0); | |
4c28f408 PA |
4592 | } |
4593 | else | |
4594 | linux_ops->to_stop (ptid); | |
4595 | } | |
4596 | ||
f973ed9c DJ |
4597 | void |
4598 | linux_nat_add_target (struct target_ops *t) | |
4599 | { | |
f973ed9c DJ |
4600 | /* Save the provided single-threaded target. We save this in a separate |
4601 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4602 | may have saved a pointer to T; we want to use it for the final | |
4603 | process stratum target. */ | |
4604 | linux_ops_saved = *t; | |
4605 | linux_ops = &linux_ops_saved; | |
4606 | ||
4607 | /* Override some methods for multithreading. */ | |
b84876c2 | 4608 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4609 | t->to_attach = linux_nat_attach; |
4610 | t->to_detach = linux_nat_detach; | |
4611 | t->to_resume = linux_nat_resume; | |
4612 | t->to_wait = linux_nat_wait; | |
4613 | t->to_xfer_partial = linux_nat_xfer_partial; | |
4614 | t->to_kill = linux_nat_kill; | |
4615 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4616 | t->to_thread_alive = linux_nat_thread_alive; | |
4617 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4618 | t->to_has_thread_control = tc_schedlock; | |
4619 | ||
b84876c2 PA |
4620 | t->to_can_async_p = linux_nat_can_async_p; |
4621 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4622 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
4623 | t->to_async = linux_nat_async; |
4624 | t->to_async_mask = linux_nat_async_mask; | |
4625 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
4626 | t->to_terminal_ours = linux_nat_terminal_ours; | |
4627 | ||
4c28f408 PA |
4628 | /* Methods for non-stop support. */ |
4629 | t->to_stop = linux_nat_stop; | |
4630 | ||
f973ed9c DJ |
4631 | /* We don't change the stratum; this target will sit at |
4632 | process_stratum and thread_db will set at thread_stratum. This | |
4633 | is a little strange, since this is a multi-threaded-capable | |
4634 | target, but we want to be on the stack below thread_db, and we | |
4635 | also want to be used for single-threaded processes. */ | |
4636 | ||
4637 | add_target (t); | |
4638 | ||
4639 | /* TODO: Eliminate this and have libthread_db use | |
4640 | find_target_beneath. */ | |
4641 | thread_db_init (t); | |
4642 | } | |
4643 | ||
9f0bdab8 DJ |
4644 | /* Register a method to call whenever a new thread is attached. */ |
4645 | void | |
4646 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
4647 | { | |
4648 | /* Save the pointer. We only support a single registered instance | |
4649 | of the GNU/Linux native target, so we do not need to map this to | |
4650 | T. */ | |
4651 | linux_nat_new_thread = new_thread; | |
4652 | } | |
4653 | ||
4654 | /* Return the saved siginfo associated with PTID. */ | |
4655 | struct siginfo * | |
4656 | linux_nat_get_siginfo (ptid_t ptid) | |
4657 | { | |
4658 | struct lwp_info *lp = find_lwp_pid (ptid); | |
4659 | ||
4660 | gdb_assert (lp != NULL); | |
4661 | ||
4662 | return &lp->siginfo; | |
4663 | } | |
4664 | ||
c6ebd6cf VP |
4665 | /* Enable/Disable async mode. */ |
4666 | ||
4667 | static void | |
4668 | linux_nat_setup_async (void) | |
4669 | { | |
4670 | if (pipe (linux_nat_event_pipe) == -1) | |
4671 | internal_error (__FILE__, __LINE__, | |
4672 | "creating event pipe failed."); | |
4673 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4674 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4675 | } | |
4676 | ||
d6b0e80f AC |
4677 | void |
4678 | _initialize_linux_nat (void) | |
4679 | { | |
b84876c2 | 4680 | sigset_t mask; |
dba24537 | 4681 | |
1bedd215 AC |
4682 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
4683 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
4684 | Specify any process id, or use the program being debugged by default.\n\ |
4685 | Specify any of the following keywords for detailed info:\n\ | |
4686 | mappings -- list of mapped memory regions.\n\ | |
4687 | stat -- list a bunch of random process info.\n\ | |
4688 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 4689 | all -- list all available /proc info.")); |
d6b0e80f | 4690 | |
b84876c2 PA |
4691 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
4692 | &debug_linux_nat, _("\ | |
4693 | Set debugging of GNU/Linux lwp module."), _("\ | |
4694 | Show debugging of GNU/Linux lwp module."), _("\ | |
4695 | Enables printf debugging output."), | |
4696 | NULL, | |
4697 | show_debug_linux_nat, | |
4698 | &setdebuglist, &showdebuglist); | |
4699 | ||
4700 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
4701 | &debug_linux_nat_async, _("\ | |
4702 | Set debugging of GNU/Linux async lwp module."), _("\ | |
4703 | Show debugging of GNU/Linux async lwp module."), _("\ | |
4704 | Enables printf debugging output."), | |
4705 | NULL, | |
4706 | show_debug_linux_nat_async, | |
4707 | &setdebuglist, &showdebuglist); | |
4708 | ||
84e46146 PA |
4709 | /* Get the default SIGCHLD action. Used while forking an inferior |
4710 | (see linux_nat_create_inferior/linux_nat_async_events). */ | |
4711 | sigaction (SIGCHLD, NULL, &sigchld_default_action); | |
4712 | ||
b84876c2 PA |
4713 | /* Block SIGCHLD by default. Doing this early prevents it getting |
4714 | unblocked if an exception is thrown due to an error while the | |
4715 | inferior is starting (sigsetjmp/siglongjmp). */ | |
4716 | sigemptyset (&mask); | |
4717 | sigaddset (&mask, SIGCHLD); | |
4718 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4719 | ||
4720 | /* Save this mask as the default. */ | |
d6b0e80f AC |
4721 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4722 | ||
b84876c2 PA |
4723 | /* The synchronous SIGCHLD handler. */ |
4724 | sync_sigchld_action.sa_handler = sigchld_handler; | |
4725 | sigemptyset (&sync_sigchld_action.sa_mask); | |
4726 | sync_sigchld_action.sa_flags = SA_RESTART; | |
4727 | ||
4728 | /* Make it the default. */ | |
4729 | sigaction (SIGCHLD, &sync_sigchld_action, NULL); | |
d6b0e80f AC |
4730 | |
4731 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4732 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4733 | sigdelset (&suspend_mask, SIGCHLD); | |
4734 | ||
b84876c2 PA |
4735 | /* SIGCHLD handler for async mode. */ |
4736 | async_sigchld_action.sa_handler = async_sigchld_handler; | |
4737 | sigemptyset (&async_sigchld_action.sa_mask); | |
4738 | async_sigchld_action.sa_flags = SA_RESTART; | |
d6b0e80f | 4739 | |
c6ebd6cf | 4740 | linux_nat_setup_async (); |
10568435 JK |
4741 | |
4742 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
4743 | &disable_randomization, _("\ | |
4744 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
4745 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
4746 | When this mode is on (which is the default), randomization of the virtual\n\ | |
4747 | address space is disabled. Standalone programs run with the randomization\n\ | |
4748 | enabled by default on some platforms."), | |
4749 | &set_disable_randomization, | |
4750 | &show_disable_randomization, | |
4751 | &setlist, &showlist); | |
d6b0e80f AC |
4752 | } |
4753 | \f | |
4754 | ||
4755 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
4756 | the GNU/Linux Threads library and therefore doesn't really belong | |
4757 | here. */ | |
4758 | ||
4759 | /* Read variable NAME in the target and return its value if found. | |
4760 | Otherwise return zero. It is assumed that the type of the variable | |
4761 | is `int'. */ | |
4762 | ||
4763 | static int | |
4764 | get_signo (const char *name) | |
4765 | { | |
4766 | struct minimal_symbol *ms; | |
4767 | int signo; | |
4768 | ||
4769 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
4770 | if (ms == NULL) | |
4771 | return 0; | |
4772 | ||
8e70166d | 4773 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
4774 | sizeof (signo)) != 0) |
4775 | return 0; | |
4776 | ||
4777 | return signo; | |
4778 | } | |
4779 | ||
4780 | /* Return the set of signals used by the threads library in *SET. */ | |
4781 | ||
4782 | void | |
4783 | lin_thread_get_thread_signals (sigset_t *set) | |
4784 | { | |
4785 | struct sigaction action; | |
4786 | int restart, cancel; | |
b84876c2 | 4787 | sigset_t blocked_mask; |
d6b0e80f | 4788 | |
b84876c2 | 4789 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
4790 | sigemptyset (set); |
4791 | ||
4792 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
4793 | cancel = get_signo ("__pthread_sig_cancel"); |
4794 | ||
4795 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
4796 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
4797 | not provide any way for the debugger to query the signal numbers - | |
4798 | fortunately they don't change! */ | |
4799 | ||
d6b0e80f | 4800 | if (restart == 0) |
17fbb0bd | 4801 | restart = __SIGRTMIN; |
d6b0e80f | 4802 | |
d6b0e80f | 4803 | if (cancel == 0) |
17fbb0bd | 4804 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
4805 | |
4806 | sigaddset (set, restart); | |
4807 | sigaddset (set, cancel); | |
4808 | ||
4809 | /* The GNU/Linux Threads library makes terminating threads send a | |
4810 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
4811 | those (to prevent them from terminating GDB itself, which is | |
4812 | likely to be their default action) and treat them the same way as | |
4813 | SIGCHLD. */ | |
4814 | ||
4815 | action.sa_handler = sigchld_handler; | |
4816 | sigemptyset (&action.sa_mask); | |
58aecb61 | 4817 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
4818 | sigaction (cancel, &action, NULL); |
4819 | ||
4820 | /* We block the "cancel" signal throughout this code ... */ | |
4821 | sigaddset (&blocked_mask, cancel); | |
4822 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
4823 | ||
4824 | /* ... except during a sigsuspend. */ | |
4825 | sigdelset (&suspend_mask, cancel); | |
4826 | } |