Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
d3587048 | 3 | Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
3993f6b1 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "target.h" | |
d6b0e80f | 25 | #include "gdb_string.h" |
3993f6b1 | 26 | #include "gdb_wait.h" |
d6b0e80f AC |
27 | #include "gdb_assert.h" |
28 | #ifdef HAVE_TKILL_SYSCALL | |
29 | #include <unistd.h> | |
30 | #include <sys/syscall.h> | |
31 | #endif | |
3993f6b1 | 32 | #include <sys/ptrace.h> |
0274a8ce | 33 | #include "linux-nat.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
dba24537 AC |
37 | #include <sys/param.h> /* for MAXPATHLEN */ |
38 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
39 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
40 | #include "gregset.h" /* for gregset */ | |
41 | #include "gdbcore.h" /* for get_exec_file */ | |
42 | #include <ctype.h> /* for isdigit */ | |
43 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
44 | #include "gdb_stat.h" /* for struct stat */ | |
45 | #include <fcntl.h> /* for O_RDONLY */ | |
46 | ||
47 | #ifndef O_LARGEFILE | |
48 | #define O_LARGEFILE 0 | |
49 | #endif | |
0274a8ce | 50 | |
3993f6b1 DJ |
51 | /* If the system headers did not provide the constants, hard-code the normal |
52 | values. */ | |
53 | #ifndef PTRACE_EVENT_FORK | |
54 | ||
55 | #define PTRACE_SETOPTIONS 0x4200 | |
56 | #define PTRACE_GETEVENTMSG 0x4201 | |
57 | ||
58 | /* options set using PTRACE_SETOPTIONS */ | |
59 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
60 | #define PTRACE_O_TRACEFORK 0x00000002 | |
61 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
62 | #define PTRACE_O_TRACECLONE 0x00000008 | |
63 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
64 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
65 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
66 | |
67 | /* Wait extended result codes for the above trace options. */ | |
68 | #define PTRACE_EVENT_FORK 1 | |
69 | #define PTRACE_EVENT_VFORK 2 | |
70 | #define PTRACE_EVENT_CLONE 3 | |
71 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 72 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 73 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
74 | |
75 | #endif /* PTRACE_EVENT_FORK */ | |
76 | ||
77 | /* We can't always assume that this flag is available, but all systems | |
78 | with the ptrace event handlers also have __WALL, so it's safe to use | |
79 | here. */ | |
80 | #ifndef __WALL | |
81 | #define __WALL 0x40000000 /* Wait for any child. */ | |
82 | #endif | |
83 | ||
d6b0e80f | 84 | static int debug_linux_nat; |
920d2a44 AC |
85 | static void |
86 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
87 | struct cmd_list_element *c, const char *value) | |
88 | { | |
89 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
90 | value); | |
91 | } | |
d6b0e80f | 92 | |
9016a515 DJ |
93 | static int linux_parent_pid; |
94 | ||
ae087d01 DJ |
95 | struct simple_pid_list |
96 | { | |
97 | int pid; | |
98 | struct simple_pid_list *next; | |
99 | }; | |
100 | struct simple_pid_list *stopped_pids; | |
101 | ||
3993f6b1 DJ |
102 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
103 | can not be used, 1 if it can. */ | |
104 | ||
105 | static int linux_supports_tracefork_flag = -1; | |
106 | ||
9016a515 DJ |
107 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
108 | PTRACE_O_TRACEVFORKDONE. */ | |
109 | ||
110 | static int linux_supports_tracevforkdone_flag = -1; | |
111 | ||
ae087d01 DJ |
112 | \f |
113 | /* Trivial list manipulation functions to keep track of a list of | |
114 | new stopped processes. */ | |
115 | static void | |
116 | add_to_pid_list (struct simple_pid_list **listp, int pid) | |
117 | { | |
118 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
119 | new_pid->pid = pid; | |
120 | new_pid->next = *listp; | |
121 | *listp = new_pid; | |
122 | } | |
123 | ||
124 | static int | |
125 | pull_pid_from_list (struct simple_pid_list **listp, int pid) | |
126 | { | |
127 | struct simple_pid_list **p; | |
128 | ||
129 | for (p = listp; *p != NULL; p = &(*p)->next) | |
130 | if ((*p)->pid == pid) | |
131 | { | |
132 | struct simple_pid_list *next = (*p)->next; | |
133 | xfree (*p); | |
134 | *p = next; | |
135 | return 1; | |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
140 | void | |
141 | linux_record_stopped_pid (int pid) | |
142 | { | |
143 | add_to_pid_list (&stopped_pids, pid); | |
144 | } | |
145 | ||
3993f6b1 DJ |
146 | \f |
147 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
148 | ||
149 | static void | |
150 | linux_tracefork_child (void) | |
151 | { | |
152 | int ret; | |
153 | ||
154 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
155 | kill (getpid (), SIGSTOP); | |
156 | fork (); | |
48bb3cce | 157 | _exit (0); |
3993f6b1 DJ |
158 | } |
159 | ||
b957e937 DJ |
160 | /* Wrapper function for waitpid which handles EINTR. */ |
161 | ||
162 | static int | |
163 | my_waitpid (int pid, int *status, int flags) | |
164 | { | |
165 | int ret; | |
166 | do | |
167 | { | |
168 | ret = waitpid (pid, status, flags); | |
169 | } | |
170 | while (ret == -1 && errno == EINTR); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
176 | ||
177 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
178 | we know that the feature is not available. This may change the tracing | |
179 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
180 | ||
181 | However, if it succeeds, we don't know for sure that the feature is | |
182 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 183 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
184 | fork tracing, and let it fork. If the process exits, we assume that we |
185 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
186 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
187 | |
188 | static void | |
b957e937 | 189 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
190 | { |
191 | int child_pid, ret, status; | |
192 | long second_pid; | |
193 | ||
b957e937 DJ |
194 | linux_supports_tracefork_flag = 0; |
195 | linux_supports_tracevforkdone_flag = 0; | |
196 | ||
197 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
198 | if (ret != 0) | |
199 | return; | |
200 | ||
3993f6b1 DJ |
201 | child_pid = fork (); |
202 | if (child_pid == -1) | |
e2e0b3e5 | 203 | perror_with_name (("fork")); |
3993f6b1 DJ |
204 | |
205 | if (child_pid == 0) | |
206 | linux_tracefork_child (); | |
207 | ||
b957e937 | 208 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 209 | if (ret == -1) |
e2e0b3e5 | 210 | perror_with_name (("waitpid")); |
3993f6b1 | 211 | else if (ret != child_pid) |
8a3fe4f8 | 212 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 213 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 214 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 215 | |
3993f6b1 DJ |
216 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
217 | if (ret != 0) | |
218 | { | |
b957e937 DJ |
219 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
220 | if (ret != 0) | |
221 | { | |
8a3fe4f8 | 222 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 DJ |
223 | return; |
224 | } | |
225 | ||
226 | ret = my_waitpid (child_pid, &status, 0); | |
227 | if (ret != child_pid) | |
8a3fe4f8 | 228 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 229 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
230 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
231 | "killed child"), status); | |
b957e937 | 232 | |
3993f6b1 DJ |
233 | return; |
234 | } | |
235 | ||
9016a515 DJ |
236 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
237 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
238 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
239 | linux_supports_tracevforkdone_flag = (ret == 0); | |
240 | ||
b957e937 DJ |
241 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
242 | if (ret != 0) | |
8a3fe4f8 | 243 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
244 | |
245 | ret = my_waitpid (child_pid, &status, 0); | |
246 | ||
3993f6b1 DJ |
247 | if (ret == child_pid && WIFSTOPPED (status) |
248 | && status >> 16 == PTRACE_EVENT_FORK) | |
249 | { | |
250 | second_pid = 0; | |
251 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
252 | if (ret == 0 && second_pid != 0) | |
253 | { | |
254 | int second_status; | |
255 | ||
256 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
257 | my_waitpid (second_pid, &second_status, 0); |
258 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
259 | if (ret != 0) | |
8a3fe4f8 | 260 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
3993f6b1 DJ |
261 | } |
262 | } | |
b957e937 | 263 | else |
8a3fe4f8 AC |
264 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
265 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 266 | |
b957e937 DJ |
267 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
268 | if (ret != 0) | |
8a3fe4f8 | 269 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 270 | my_waitpid (child_pid, &status, 0); |
3993f6b1 DJ |
271 | } |
272 | ||
273 | /* Return non-zero iff we have tracefork functionality available. | |
274 | This function also sets linux_supports_tracefork_flag. */ | |
275 | ||
276 | static int | |
b957e937 | 277 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
278 | { |
279 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 280 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
281 | return linux_supports_tracefork_flag; |
282 | } | |
283 | ||
9016a515 | 284 | static int |
b957e937 | 285 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
286 | { |
287 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 288 | linux_test_for_tracefork (pid); |
9016a515 DJ |
289 | return linux_supports_tracevforkdone_flag; |
290 | } | |
291 | ||
3993f6b1 | 292 | \f |
4de4c07c DJ |
293 | void |
294 | linux_enable_event_reporting (ptid_t ptid) | |
295 | { | |
d3587048 | 296 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
297 | int options; |
298 | ||
d3587048 DJ |
299 | if (pid == 0) |
300 | pid = ptid_get_pid (ptid); | |
301 | ||
b957e937 | 302 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
303 | return; |
304 | ||
a2f23071 DJ |
305 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
306 | | PTRACE_O_TRACECLONE; | |
b957e937 | 307 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
308 | options |= PTRACE_O_TRACEVFORKDONE; |
309 | ||
310 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
311 | read-only process state. */ | |
4de4c07c DJ |
312 | |
313 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
314 | } | |
315 | ||
316 | void | |
317 | child_post_attach (int pid) | |
318 | { | |
319 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
320 | } | |
321 | ||
322 | void | |
323 | linux_child_post_startup_inferior (ptid_t ptid) | |
324 | { | |
325 | linux_enable_event_reporting (ptid); | |
326 | } | |
327 | ||
328 | #ifndef LINUX_CHILD_POST_STARTUP_INFERIOR | |
329 | void | |
330 | child_post_startup_inferior (ptid_t ptid) | |
331 | { | |
332 | linux_child_post_startup_inferior (ptid); | |
333 | } | |
334 | #endif | |
335 | ||
3993f6b1 | 336 | int |
4de4c07c | 337 | child_follow_fork (int follow_child) |
3993f6b1 | 338 | { |
4de4c07c DJ |
339 | ptid_t last_ptid; |
340 | struct target_waitstatus last_status; | |
9016a515 | 341 | int has_vforked; |
4de4c07c DJ |
342 | int parent_pid, child_pid; |
343 | ||
344 | get_last_target_status (&last_ptid, &last_status); | |
9016a515 | 345 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
346 | parent_pid = ptid_get_lwp (last_ptid); |
347 | if (parent_pid == 0) | |
348 | parent_pid = ptid_get_pid (last_ptid); | |
4de4c07c DJ |
349 | child_pid = last_status.value.related_pid; |
350 | ||
351 | if (! follow_child) | |
352 | { | |
353 | /* We're already attached to the parent, by default. */ | |
354 | ||
355 | /* Before detaching from the child, remove all breakpoints from | |
356 | it. (This won't actually modify the breakpoint list, but will | |
357 | physically remove the breakpoints from the child.) */ | |
9016a515 DJ |
358 | /* If we vforked this will remove the breakpoints from the parent |
359 | also, but they'll be reinserted below. */ | |
4de4c07c DJ |
360 | detach_breakpoints (child_pid); |
361 | ||
362 | fprintf_filtered (gdb_stdout, | |
363 | "Detaching after fork from child process %d.\n", | |
364 | child_pid); | |
365 | ||
366 | ptrace (PTRACE_DETACH, child_pid, 0, 0); | |
9016a515 DJ |
367 | |
368 | if (has_vforked) | |
369 | { | |
b957e937 DJ |
370 | gdb_assert (linux_supports_tracefork_flag >= 0); |
371 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
372 | { |
373 | int status; | |
374 | ||
375 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
376 | waitpid (parent_pid, &status, __WALL); | |
c874c7fc | 377 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
378 | warning (_("Unexpected waitpid result %06x when waiting for " |
379 | "vfork-done"), status); | |
9016a515 DJ |
380 | } |
381 | else | |
382 | { | |
383 | /* We can't insert breakpoints until the child has | |
384 | finished with the shared memory region. We need to | |
385 | wait until that happens. Ideal would be to just | |
386 | call: | |
387 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
388 | - waitpid (parent_pid, &status, __WALL); | |
389 | However, most architectures can't handle a syscall | |
390 | being traced on the way out if it wasn't traced on | |
391 | the way in. | |
392 | ||
393 | We might also think to loop, continuing the child | |
394 | until it exits or gets a SIGTRAP. One problem is | |
395 | that the child might call ptrace with PTRACE_TRACEME. | |
396 | ||
397 | There's no simple and reliable way to figure out when | |
398 | the vforked child will be done with its copy of the | |
399 | shared memory. We could step it out of the syscall, | |
400 | two instructions, let it go, and then single-step the | |
401 | parent once. When we have hardware single-step, this | |
402 | would work; with software single-step it could still | |
403 | be made to work but we'd have to be able to insert | |
404 | single-step breakpoints in the child, and we'd have | |
405 | to insert -just- the single-step breakpoint in the | |
406 | parent. Very awkward. | |
407 | ||
408 | In the end, the best we can do is to make sure it | |
409 | runs for a little while. Hopefully it will be out of | |
410 | range of any breakpoints we reinsert. Usually this | |
411 | is only the single-step breakpoint at vfork's return | |
412 | point. */ | |
413 | ||
414 | usleep (10000); | |
415 | } | |
416 | ||
417 | /* Since we vforked, breakpoints were removed in the parent | |
418 | too. Put them back. */ | |
419 | reattach_breakpoints (parent_pid); | |
420 | } | |
4de4c07c | 421 | } |
3993f6b1 | 422 | else |
4de4c07c DJ |
423 | { |
424 | char child_pid_spelling[40]; | |
425 | ||
426 | /* Needed to keep the breakpoint lists in sync. */ | |
9016a515 DJ |
427 | if (! has_vforked) |
428 | detach_breakpoints (child_pid); | |
4de4c07c DJ |
429 | |
430 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
431 | remove_breakpoints (); | |
432 | ||
433 | fprintf_filtered (gdb_stdout, | |
434 | "Attaching after fork to child process %d.\n", | |
435 | child_pid); | |
436 | ||
9016a515 DJ |
437 | /* If we're vforking, we may want to hold on to the parent until |
438 | the child exits or execs. At exec time we can remove the old | |
439 | breakpoints from the parent and detach it; at exit time we | |
440 | could do the same (or even, sneakily, resume debugging it - the | |
441 | child's exec has failed, or something similar). | |
442 | ||
443 | This doesn't clean up "properly", because we can't call | |
444 | target_detach, but that's OK; if the current target is "child", | |
445 | then it doesn't need any further cleanups, and lin_lwp will | |
446 | generally not encounter vfork (vfork is defined to fork | |
447 | in libpthread.so). | |
448 | ||
449 | The holding part is very easy if we have VFORKDONE events; | |
450 | but keeping track of both processes is beyond GDB at the | |
451 | moment. So we don't expose the parent to the rest of GDB. | |
452 | Instead we quietly hold onto it until such time as we can | |
453 | safely resume it. */ | |
454 | ||
455 | if (has_vforked) | |
456 | linux_parent_pid = parent_pid; | |
457 | else | |
458 | target_detach (NULL, 0); | |
4de4c07c DJ |
459 | |
460 | inferior_ptid = pid_to_ptid (child_pid); | |
1df84f13 | 461 | push_target (&deprecated_child_ops); |
4de4c07c DJ |
462 | |
463 | /* Reset breakpoints in the child as appropriate. */ | |
464 | follow_inferior_reset_breakpoints (); | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | ptid_t | |
471 | linux_handle_extended_wait (int pid, int status, | |
472 | struct target_waitstatus *ourstatus) | |
473 | { | |
474 | int event = status >> 16; | |
475 | ||
a2f23071 DJ |
476 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
477 | || event == PTRACE_EVENT_CLONE) | |
4de4c07c DJ |
478 | { |
479 | unsigned long new_pid; | |
480 | int ret; | |
481 | ||
482 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
483 | ||
484 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
485 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
486 | { | |
487 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
a2f23071 | 488 | hits the SIGSTOP, but we're already attached. */ |
4de4c07c | 489 | do { |
a2f23071 DJ |
490 | ret = waitpid (new_pid, &status, |
491 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
4de4c07c DJ |
492 | } while (ret == -1 && errno == EINTR); |
493 | if (ret == -1) | |
e2e0b3e5 | 494 | perror_with_name (_("waiting for new child")); |
4de4c07c DJ |
495 | else if (ret != new_pid) |
496 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 497 | _("wait returned unexpected PID %d"), ret); |
4de4c07c DJ |
498 | else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP) |
499 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 500 | _("wait returned unexpected status 0x%x"), status); |
4de4c07c DJ |
501 | } |
502 | ||
a2f23071 DJ |
503 | if (event == PTRACE_EVENT_FORK) |
504 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
505 | else if (event == PTRACE_EVENT_VFORK) | |
506 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
507 | else | |
508 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
509 | ||
4de4c07c DJ |
510 | ourstatus->value.related_pid = new_pid; |
511 | return inferior_ptid; | |
512 | } | |
513 | ||
9016a515 DJ |
514 | if (event == PTRACE_EVENT_EXEC) |
515 | { | |
516 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
517 | ourstatus->value.execd_pathname | |
518 | = xstrdup (child_pid_to_exec_file (pid)); | |
519 | ||
520 | if (linux_parent_pid) | |
521 | { | |
522 | detach_breakpoints (linux_parent_pid); | |
523 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
524 | ||
525 | linux_parent_pid = 0; | |
526 | } | |
527 | ||
528 | return inferior_ptid; | |
529 | } | |
530 | ||
4de4c07c | 531 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 532 | _("unknown ptrace event %d"), event); |
4de4c07c DJ |
533 | } |
534 | ||
535 | \f | |
fa113d1a | 536 | void |
4de4c07c DJ |
537 | child_insert_fork_catchpoint (int pid) |
538 | { | |
b957e937 | 539 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 540 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
541 | } |
542 | ||
fa113d1a | 543 | void |
3993f6b1 DJ |
544 | child_insert_vfork_catchpoint (int pid) |
545 | { | |
b957e937 | 546 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 547 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
548 | } |
549 | ||
fa113d1a | 550 | void |
3993f6b1 DJ |
551 | child_insert_exec_catchpoint (int pid) |
552 | { | |
b957e937 | 553 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 554 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
555 | } |
556 | ||
4de4c07c DJ |
557 | void |
558 | kill_inferior (void) | |
559 | { | |
560 | int status; | |
561 | int pid = PIDGET (inferior_ptid); | |
562 | struct target_waitstatus last; | |
563 | ptid_t last_ptid; | |
564 | int ret; | |
565 | ||
566 | if (pid == 0) | |
567 | return; | |
568 | ||
569 | /* If we're stopped while forking and we haven't followed yet, kill the | |
570 | other task. We need to do this first because the parent will be | |
571 | sleeping if this is a vfork. */ | |
572 | ||
573 | get_last_target_status (&last_ptid, &last); | |
3993f6b1 | 574 | |
4de4c07c DJ |
575 | if (last.kind == TARGET_WAITKIND_FORKED |
576 | || last.kind == TARGET_WAITKIND_VFORKED) | |
577 | { | |
de9a9e51 | 578 | ptrace (PT_KILL, last.value.related_pid, 0, 0); |
ee21b650 | 579 | wait (&status); |
4de4c07c DJ |
580 | } |
581 | ||
582 | /* Kill the current process. */ | |
de9a9e51 | 583 | ptrace (PT_KILL, pid, 0, 0); |
ee21b650 | 584 | ret = wait (&status); |
4de4c07c DJ |
585 | |
586 | /* We might get a SIGCHLD instead of an exit status. This is | |
587 | aggravated by the first kill above - a child has just died. */ | |
588 | ||
589 | while (ret == pid && WIFSTOPPED (status)) | |
590 | { | |
de9a9e51 | 591 | ptrace (PT_KILL, pid, 0, 0); |
ee21b650 | 592 | ret = wait (&status); |
4de4c07c DJ |
593 | } |
594 | ||
595 | target_mourn_inferior (); | |
596 | } | |
d6b0e80f AC |
597 | |
598 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's | |
599 | are processes sharing the same VM space. A multi-threaded process | |
600 | is basically a group of such processes. However, such a grouping | |
601 | is almost entirely a user-space issue; the kernel doesn't enforce | |
602 | such a grouping at all (this might change in the future). In | |
603 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
604 | Threads library) to provide such a grouping. | |
605 | ||
606 | It is perfectly well possible to write a multi-threaded application | |
607 | without the assistance of a threads library, by using the clone | |
608 | system call directly. This module should be able to give some | |
609 | rudimentary support for debugging such applications if developers | |
610 | specify the CLONE_PTRACE flag in the clone system call, and are | |
611 | using the Linux kernel 2.4 or above. | |
612 | ||
613 | Note that there are some peculiarities in GNU/Linux that affect | |
614 | this code: | |
615 | ||
616 | - In general one should specify the __WCLONE flag to waitpid in | |
617 | order to make it report events for any of the cloned processes | |
618 | (and leave it out for the initial process). However, if a cloned | |
619 | process has exited the exit status is only reported if the | |
620 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
621 | we cannot use it since GDB must work on older systems too. | |
622 | ||
623 | - When a traced, cloned process exits and is waited for by the | |
624 | debugger, the kernel reassigns it to the original parent and | |
625 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
626 | library doesn't notice this, which leads to the "zombie problem": | |
627 | When debugged a multi-threaded process that spawns a lot of | |
628 | threads will run out of processes, even if the threads exit, | |
629 | because the "zombies" stay around. */ | |
630 | ||
631 | /* List of known LWPs. */ | |
632 | static struct lwp_info *lwp_list; | |
633 | ||
634 | /* Number of LWPs in the list. */ | |
635 | static int num_lwps; | |
636 | ||
637 | /* Non-zero if we're running in "threaded" mode. */ | |
638 | static int threaded; | |
639 | \f | |
640 | ||
641 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
642 | #define GET_PID(ptid) ptid_get_pid (ptid) | |
643 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) | |
644 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) | |
645 | ||
646 | /* If the last reported event was a SIGTRAP, this variable is set to | |
647 | the process id of the LWP/thread that got it. */ | |
648 | ptid_t trap_ptid; | |
649 | \f | |
650 | ||
651 | /* This module's target-specific operations. */ | |
652 | static struct target_ops linux_nat_ops; | |
653 | ||
d6b0e80f AC |
654 | /* Since we cannot wait (in linux_nat_wait) for the initial process and |
655 | any cloned processes with a single call to waitpid, we have to use | |
656 | the WNOHANG flag and call waitpid in a loop. To optimize | |
657 | things a bit we use `sigsuspend' to wake us up when a process has | |
658 | something to report (it will send us a SIGCHLD if it has). To make | |
659 | this work we have to juggle with the signal mask. We save the | |
660 | original signal mask such that we can restore it before creating a | |
661 | new process in order to avoid blocking certain signals in the | |
662 | inferior. We then block SIGCHLD during the waitpid/sigsuspend | |
663 | loop. */ | |
664 | ||
665 | /* Original signal mask. */ | |
666 | static sigset_t normal_mask; | |
667 | ||
668 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
669 | _initialize_linux_nat. */ | |
670 | static sigset_t suspend_mask; | |
671 | ||
672 | /* Signals to block to make that sigsuspend work. */ | |
673 | static sigset_t blocked_mask; | |
674 | \f | |
675 | ||
676 | /* Prototypes for local functions. */ | |
677 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
678 | static int linux_nat_thread_alive (ptid_t ptid); | |
679 | \f | |
680 | /* Convert wait status STATUS to a string. Used for printing debug | |
681 | messages only. */ | |
682 | ||
683 | static char * | |
684 | status_to_str (int status) | |
685 | { | |
686 | static char buf[64]; | |
687 | ||
688 | if (WIFSTOPPED (status)) | |
689 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
690 | strsignal (WSTOPSIG (status))); | |
691 | else if (WIFSIGNALED (status)) | |
692 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
693 | strsignal (WSTOPSIG (status))); | |
694 | else | |
695 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
696 | ||
697 | return buf; | |
698 | } | |
699 | ||
700 | /* Initialize the list of LWPs. Note that this module, contrary to | |
701 | what GDB's generic threads layer does for its thread list, | |
702 | re-initializes the LWP lists whenever we mourn or detach (which | |
703 | doesn't involve mourning) the inferior. */ | |
704 | ||
705 | static void | |
706 | init_lwp_list (void) | |
707 | { | |
708 | struct lwp_info *lp, *lpnext; | |
709 | ||
710 | for (lp = lwp_list; lp; lp = lpnext) | |
711 | { | |
712 | lpnext = lp->next; | |
713 | xfree (lp); | |
714 | } | |
715 | ||
716 | lwp_list = NULL; | |
717 | num_lwps = 0; | |
718 | threaded = 0; | |
719 | } | |
720 | ||
721 | /* Add the LWP specified by PID to the list. If this causes the | |
722 | number of LWPs to become larger than one, go into "threaded" mode. | |
723 | Return a pointer to the structure describing the new LWP. */ | |
724 | ||
725 | static struct lwp_info * | |
726 | add_lwp (ptid_t ptid) | |
727 | { | |
728 | struct lwp_info *lp; | |
729 | ||
730 | gdb_assert (is_lwp (ptid)); | |
731 | ||
732 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
733 | ||
734 | memset (lp, 0, sizeof (struct lwp_info)); | |
735 | ||
736 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
737 | ||
738 | lp->ptid = ptid; | |
739 | ||
740 | lp->next = lwp_list; | |
741 | lwp_list = lp; | |
742 | if (++num_lwps > 1) | |
743 | threaded = 1; | |
744 | ||
745 | return lp; | |
746 | } | |
747 | ||
748 | /* Remove the LWP specified by PID from the list. */ | |
749 | ||
750 | static void | |
751 | delete_lwp (ptid_t ptid) | |
752 | { | |
753 | struct lwp_info *lp, *lpprev; | |
754 | ||
755 | lpprev = NULL; | |
756 | ||
757 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
758 | if (ptid_equal (lp->ptid, ptid)) | |
759 | break; | |
760 | ||
761 | if (!lp) | |
762 | return; | |
763 | ||
764 | /* We don't go back to "non-threaded" mode if the number of threads | |
765 | becomes less than two. */ | |
766 | num_lwps--; | |
767 | ||
768 | if (lpprev) | |
769 | lpprev->next = lp->next; | |
770 | else | |
771 | lwp_list = lp->next; | |
772 | ||
773 | xfree (lp); | |
774 | } | |
775 | ||
776 | /* Return a pointer to the structure describing the LWP corresponding | |
777 | to PID. If no corresponding LWP could be found, return NULL. */ | |
778 | ||
779 | static struct lwp_info * | |
780 | find_lwp_pid (ptid_t ptid) | |
781 | { | |
782 | struct lwp_info *lp; | |
783 | int lwp; | |
784 | ||
785 | if (is_lwp (ptid)) | |
786 | lwp = GET_LWP (ptid); | |
787 | else | |
788 | lwp = GET_PID (ptid); | |
789 | ||
790 | for (lp = lwp_list; lp; lp = lp->next) | |
791 | if (lwp == GET_LWP (lp->ptid)) | |
792 | return lp; | |
793 | ||
794 | return NULL; | |
795 | } | |
796 | ||
797 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
798 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
799 | pointer to the structure describing that LWP immediately. | |
800 | Otherwise return NULL. */ | |
801 | ||
802 | struct lwp_info * | |
803 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
804 | { | |
805 | struct lwp_info *lp, *lpnext; | |
806 | ||
807 | for (lp = lwp_list; lp; lp = lpnext) | |
808 | { | |
809 | lpnext = lp->next; | |
810 | if ((*callback) (lp, data)) | |
811 | return lp; | |
812 | } | |
813 | ||
814 | return NULL; | |
815 | } | |
816 | ||
817 | /* Attach to the LWP specified by PID. If VERBOSE is non-zero, print | |
818 | a message telling the user that a new LWP has been added to the | |
819 | process. */ | |
820 | ||
821 | void | |
822 | lin_lwp_attach_lwp (ptid_t ptid, int verbose) | |
823 | { | |
824 | struct lwp_info *lp, *found_lp; | |
825 | ||
826 | gdb_assert (is_lwp (ptid)); | |
827 | ||
828 | /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events | |
829 | to interrupt either the ptrace() or waitpid() calls below. */ | |
830 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
831 | { | |
832 | sigaddset (&blocked_mask, SIGCHLD); | |
833 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
834 | } | |
835 | ||
836 | if (verbose) | |
a3f17187 | 837 | printf_filtered (_("[New %s]\n"), target_pid_to_str (ptid)); |
d6b0e80f AC |
838 | |
839 | found_lp = lp = find_lwp_pid (ptid); | |
840 | if (lp == NULL) | |
841 | lp = add_lwp (ptid); | |
842 | ||
843 | /* We assume that we're already attached to any LWP that has an id | |
844 | equal to the overall process id, and to any LWP that is already | |
845 | in our list of LWPs. If we're not seeing exit events from threads | |
846 | and we've had PID wraparound since we last tried to stop all threads, | |
847 | this assumption might be wrong; fortunately, this is very unlikely | |
848 | to happen. */ | |
849 | if (GET_LWP (ptid) != GET_PID (ptid) && found_lp == NULL) | |
850 | { | |
851 | pid_t pid; | |
852 | int status; | |
853 | ||
854 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
8a3fe4f8 | 855 | error (_("Can't attach %s: %s"), target_pid_to_str (ptid), |
d6b0e80f AC |
856 | safe_strerror (errno)); |
857 | ||
858 | if (debug_linux_nat) | |
859 | fprintf_unfiltered (gdb_stdlog, | |
860 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
861 | target_pid_to_str (ptid)); | |
862 | ||
863 | pid = waitpid (GET_LWP (ptid), &status, 0); | |
864 | if (pid == -1 && errno == ECHILD) | |
865 | { | |
866 | /* Try again with __WCLONE to check cloned processes. */ | |
867 | pid = waitpid (GET_LWP (ptid), &status, __WCLONE); | |
868 | lp->cloned = 1; | |
869 | } | |
870 | ||
871 | gdb_assert (pid == GET_LWP (ptid) | |
872 | && WIFSTOPPED (status) && WSTOPSIG (status)); | |
873 | ||
874 | child_post_attach (pid); | |
875 | ||
876 | lp->stopped = 1; | |
877 | ||
878 | if (debug_linux_nat) | |
879 | { | |
880 | fprintf_unfiltered (gdb_stdlog, | |
881 | "LLAL: waitpid %s received %s\n", | |
882 | target_pid_to_str (ptid), | |
883 | status_to_str (status)); | |
884 | } | |
885 | } | |
886 | else | |
887 | { | |
888 | /* We assume that the LWP representing the original process is | |
889 | already stopped. Mark it as stopped in the data structure | |
890 | that the linux ptrace layer uses to keep track of threads. | |
891 | Note that this won't have already been done since the main | |
892 | thread will have, we assume, been stopped by an attach from a | |
893 | different layer. */ | |
894 | lp->stopped = 1; | |
895 | } | |
896 | } | |
897 | ||
898 | static void | |
899 | linux_nat_attach (char *args, int from_tty) | |
900 | { | |
901 | struct lwp_info *lp; | |
902 | pid_t pid; | |
903 | int status; | |
904 | ||
905 | /* FIXME: We should probably accept a list of process id's, and | |
906 | attach all of them. */ | |
1df84f13 | 907 | deprecated_child_ops.to_attach (args, from_tty); |
d6b0e80f AC |
908 | |
909 | /* Add the initial process as the first LWP to the list. */ | |
910 | lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid))); | |
911 | ||
912 | /* Make sure the initial process is stopped. The user-level threads | |
913 | layer might want to poke around in the inferior, and that won't | |
914 | work if things haven't stabilized yet. */ | |
915 | pid = waitpid (GET_PID (inferior_ptid), &status, 0); | |
916 | if (pid == -1 && errno == ECHILD) | |
917 | { | |
8a3fe4f8 | 918 | warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid)); |
d6b0e80f AC |
919 | |
920 | /* Try again with __WCLONE to check cloned processes. */ | |
921 | pid = waitpid (GET_PID (inferior_ptid), &status, __WCLONE); | |
922 | lp->cloned = 1; | |
923 | } | |
924 | ||
925 | gdb_assert (pid == GET_PID (inferior_ptid) | |
926 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP); | |
927 | ||
928 | lp->stopped = 1; | |
929 | ||
930 | /* Fake the SIGSTOP that core GDB expects. */ | |
931 | lp->status = W_STOPCODE (SIGSTOP); | |
932 | lp->resumed = 1; | |
933 | if (debug_linux_nat) | |
934 | { | |
935 | fprintf_unfiltered (gdb_stdlog, | |
936 | "LLA: waitpid %ld, faking SIGSTOP\n", (long) pid); | |
937 | } | |
938 | } | |
939 | ||
940 | static int | |
941 | detach_callback (struct lwp_info *lp, void *data) | |
942 | { | |
943 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
944 | ||
945 | if (debug_linux_nat && lp->status) | |
946 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
947 | strsignal (WSTOPSIG (lp->status)), | |
948 | target_pid_to_str (lp->ptid)); | |
949 | ||
950 | while (lp->signalled && lp->stopped) | |
951 | { | |
952 | errno = 0; | |
953 | if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, | |
954 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 955 | error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
956 | safe_strerror (errno)); |
957 | ||
958 | if (debug_linux_nat) | |
959 | fprintf_unfiltered (gdb_stdlog, | |
960 | "DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n", | |
961 | target_pid_to_str (lp->ptid), | |
962 | status_to_str (lp->status)); | |
963 | ||
964 | lp->stopped = 0; | |
965 | lp->signalled = 0; | |
966 | lp->status = 0; | |
967 | /* FIXME drow/2003-08-26: There was a call to stop_wait_callback | |
968 | here. But since lp->signalled was cleared above, | |
969 | stop_wait_callback didn't do anything; the process was left | |
970 | running. Shouldn't we be waiting for it to stop? | |
971 | I've removed the call, since stop_wait_callback now does do | |
972 | something when called with lp->signalled == 0. */ | |
973 | ||
974 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
975 | } | |
976 | ||
977 | /* We don't actually detach from the LWP that has an id equal to the | |
978 | overall process id just yet. */ | |
979 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
980 | { | |
981 | errno = 0; | |
982 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
983 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 984 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
985 | safe_strerror (errno)); |
986 | ||
987 | if (debug_linux_nat) | |
988 | fprintf_unfiltered (gdb_stdlog, | |
989 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
990 | target_pid_to_str (lp->ptid), | |
991 | strsignal (WSTOPSIG (lp->status))); | |
992 | ||
993 | delete_lwp (lp->ptid); | |
994 | } | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | static void | |
1000 | linux_nat_detach (char *args, int from_tty) | |
1001 | { | |
1002 | iterate_over_lwps (detach_callback, NULL); | |
1003 | ||
1004 | /* Only the initial process should be left right now. */ | |
1005 | gdb_assert (num_lwps == 1); | |
1006 | ||
1007 | trap_ptid = null_ptid; | |
1008 | ||
1009 | /* Destroy LWP info; it's no longer valid. */ | |
1010 | init_lwp_list (); | |
1011 | ||
1012 | /* Restore the original signal mask. */ | |
1013 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1014 | sigemptyset (&blocked_mask); | |
1015 | ||
1016 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); | |
1df84f13 | 1017 | deprecated_child_ops.to_detach (args, from_tty); |
d6b0e80f AC |
1018 | } |
1019 | ||
1020 | /* Resume LP. */ | |
1021 | ||
1022 | static int | |
1023 | resume_callback (struct lwp_info *lp, void *data) | |
1024 | { | |
1025 | if (lp->stopped && lp->status == 0) | |
1026 | { | |
1027 | struct thread_info *tp; | |
1028 | ||
1029 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0); | |
1030 | if (debug_linux_nat) | |
1031 | fprintf_unfiltered (gdb_stdlog, | |
1032 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1033 | target_pid_to_str (lp->ptid)); | |
1034 | lp->stopped = 0; | |
1035 | lp->step = 0; | |
1036 | } | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int | |
1042 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1043 | { | |
1044 | lp->resumed = 0; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | static int | |
1049 | resume_set_callback (struct lwp_info *lp, void *data) | |
1050 | { | |
1051 | lp->resumed = 1; | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | static void | |
1056 | linux_nat_resume (ptid_t ptid, int step, enum target_signal signo) | |
1057 | { | |
1058 | struct lwp_info *lp; | |
1059 | int resume_all; | |
1060 | ||
1061 | /* A specific PTID means `step only this process id'. */ | |
1062 | resume_all = (PIDGET (ptid) == -1); | |
1063 | ||
1064 | if (resume_all) | |
1065 | iterate_over_lwps (resume_set_callback, NULL); | |
1066 | else | |
1067 | iterate_over_lwps (resume_clear_callback, NULL); | |
1068 | ||
1069 | /* If PID is -1, it's the current inferior that should be | |
1070 | handled specially. */ | |
1071 | if (PIDGET (ptid) == -1) | |
1072 | ptid = inferior_ptid; | |
1073 | ||
1074 | lp = find_lwp_pid (ptid); | |
1075 | if (lp) | |
1076 | { | |
1077 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
1078 | ||
1079 | /* Remember if we're stepping. */ | |
1080 | lp->step = step; | |
1081 | ||
1082 | /* Mark this LWP as resumed. */ | |
1083 | lp->resumed = 1; | |
1084 | ||
1085 | /* If we have a pending wait status for this thread, there is no | |
1086 | point in resuming the process. */ | |
1087 | if (lp->status) | |
1088 | { | |
1089 | /* FIXME: What should we do if we are supposed to continue | |
1090 | this thread with a signal? */ | |
1091 | gdb_assert (signo == TARGET_SIGNAL_0); | |
1092 | return; | |
1093 | } | |
1094 | ||
1095 | /* Mark LWP as not stopped to prevent it from being continued by | |
1096 | resume_callback. */ | |
1097 | lp->stopped = 0; | |
1098 | } | |
1099 | ||
1100 | if (resume_all) | |
1101 | iterate_over_lwps (resume_callback, NULL); | |
1102 | ||
1103 | child_resume (ptid, step, signo); | |
1104 | if (debug_linux_nat) | |
1105 | fprintf_unfiltered (gdb_stdlog, | |
1106 | "LLR: %s %s, %s (resume event thread)\n", | |
1107 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1108 | target_pid_to_str (ptid), | |
1109 | signo ? strsignal (signo) : "0"); | |
1110 | } | |
1111 | ||
1112 | /* Issue kill to specified lwp. */ | |
1113 | ||
1114 | static int tkill_failed; | |
1115 | ||
1116 | static int | |
1117 | kill_lwp (int lwpid, int signo) | |
1118 | { | |
1119 | errno = 0; | |
1120 | ||
1121 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1122 | fails, then we are not using nptl threads and we should be using kill. */ | |
1123 | ||
1124 | #ifdef HAVE_TKILL_SYSCALL | |
1125 | if (!tkill_failed) | |
1126 | { | |
1127 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1128 | if (errno != ENOSYS) | |
1129 | return ret; | |
1130 | errno = 0; | |
1131 | tkill_failed = 1; | |
1132 | } | |
1133 | #endif | |
1134 | ||
1135 | return kill (lwpid, signo); | |
1136 | } | |
1137 | ||
1138 | /* Handle a GNU/Linux extended wait response. Most of the work we | |
1139 | just pass off to linux_handle_extended_wait, but if it reports a | |
1140 | clone event we need to add the new LWP to our list (and not report | |
1141 | the trap to higher layers). This function returns non-zero if | |
1142 | the event should be ignored and we should wait again. */ | |
1143 | ||
1144 | static int | |
1145 | linux_nat_handle_extended (struct lwp_info *lp, int status) | |
1146 | { | |
1147 | linux_handle_extended_wait (GET_LWP (lp->ptid), status, | |
1148 | &lp->waitstatus); | |
1149 | ||
1150 | /* TARGET_WAITKIND_SPURIOUS is used to indicate clone events. */ | |
1151 | if (lp->waitstatus.kind == TARGET_WAITKIND_SPURIOUS) | |
1152 | { | |
1153 | struct lwp_info *new_lp; | |
1154 | new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid, | |
1155 | GET_PID (inferior_ptid))); | |
1156 | new_lp->cloned = 1; | |
1157 | new_lp->stopped = 1; | |
1158 | ||
1159 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1160 | ||
1161 | if (debug_linux_nat) | |
1162 | fprintf_unfiltered (gdb_stdlog, | |
1163 | "LLHE: Got clone event from LWP %ld, resuming\n", | |
1164 | GET_LWP (lp->ptid)); | |
1165 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1166 | ||
1167 | return 1; | |
1168 | } | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1174 | exited. */ | |
1175 | ||
1176 | static int | |
1177 | wait_lwp (struct lwp_info *lp) | |
1178 | { | |
1179 | pid_t pid; | |
1180 | int status; | |
1181 | int thread_dead = 0; | |
1182 | ||
1183 | gdb_assert (!lp->stopped); | |
1184 | gdb_assert (lp->status == 0); | |
1185 | ||
1186 | pid = waitpid (GET_LWP (lp->ptid), &status, 0); | |
1187 | if (pid == -1 && errno == ECHILD) | |
1188 | { | |
1189 | pid = waitpid (GET_LWP (lp->ptid), &status, __WCLONE); | |
1190 | if (pid == -1 && errno == ECHILD) | |
1191 | { | |
1192 | /* The thread has previously exited. We need to delete it | |
1193 | now because, for some vendor 2.4 kernels with NPTL | |
1194 | support backported, there won't be an exit event unless | |
1195 | it is the main thread. 2.6 kernels will report an exit | |
1196 | event for each thread that exits, as expected. */ | |
1197 | thread_dead = 1; | |
1198 | if (debug_linux_nat) | |
1199 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1200 | target_pid_to_str (lp->ptid)); | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | if (!thread_dead) | |
1205 | { | |
1206 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
1207 | ||
1208 | if (debug_linux_nat) | |
1209 | { | |
1210 | fprintf_unfiltered (gdb_stdlog, | |
1211 | "WL: waitpid %s received %s\n", | |
1212 | target_pid_to_str (lp->ptid), | |
1213 | status_to_str (status)); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | /* Check if the thread has exited. */ | |
1218 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
1219 | { | |
1220 | thread_dead = 1; | |
1221 | if (debug_linux_nat) | |
1222 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
1223 | target_pid_to_str (lp->ptid)); | |
1224 | } | |
1225 | ||
1226 | if (thread_dead) | |
1227 | { | |
1228 | if (in_thread_list (lp->ptid)) | |
1229 | { | |
1230 | /* Core GDB cannot deal with us deleting the current thread. */ | |
1231 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
1232 | delete_thread (lp->ptid); | |
a3f17187 | 1233 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
1234 | target_pid_to_str (lp->ptid)); |
1235 | } | |
1236 | ||
1237 | delete_lwp (lp->ptid); | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | gdb_assert (WIFSTOPPED (status)); | |
1242 | ||
1243 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1244 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1245 | { | |
1246 | if (debug_linux_nat) | |
1247 | fprintf_unfiltered (gdb_stdlog, | |
1248 | "WL: Handling extended status 0x%06x\n", | |
1249 | status); | |
1250 | if (linux_nat_handle_extended (lp, status)) | |
1251 | return wait_lwp (lp); | |
1252 | } | |
1253 | ||
1254 | return status; | |
1255 | } | |
1256 | ||
1257 | /* Send a SIGSTOP to LP. */ | |
1258 | ||
1259 | static int | |
1260 | stop_callback (struct lwp_info *lp, void *data) | |
1261 | { | |
1262 | if (!lp->stopped && !lp->signalled) | |
1263 | { | |
1264 | int ret; | |
1265 | ||
1266 | if (debug_linux_nat) | |
1267 | { | |
1268 | fprintf_unfiltered (gdb_stdlog, | |
1269 | "SC: kill %s **<SIGSTOP>**\n", | |
1270 | target_pid_to_str (lp->ptid)); | |
1271 | } | |
1272 | errno = 0; | |
1273 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
1274 | if (debug_linux_nat) | |
1275 | { | |
1276 | fprintf_unfiltered (gdb_stdlog, | |
1277 | "SC: lwp kill %d %s\n", | |
1278 | ret, | |
1279 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
1280 | } | |
1281 | ||
1282 | lp->signalled = 1; | |
1283 | gdb_assert (lp->status == 0); | |
1284 | } | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /* Wait until LP is stopped. If DATA is non-null it is interpreted as | |
1290 | a pointer to a set of signals to be flushed immediately. */ | |
1291 | ||
1292 | static int | |
1293 | stop_wait_callback (struct lwp_info *lp, void *data) | |
1294 | { | |
1295 | sigset_t *flush_mask = data; | |
1296 | ||
1297 | if (!lp->stopped) | |
1298 | { | |
1299 | int status; | |
1300 | ||
1301 | status = wait_lwp (lp); | |
1302 | if (status == 0) | |
1303 | return 0; | |
1304 | ||
1305 | /* Ignore any signals in FLUSH_MASK. */ | |
1306 | if (flush_mask && sigismember (flush_mask, WSTOPSIG (status))) | |
1307 | { | |
1308 | if (!lp->signalled) | |
1309 | { | |
1310 | lp->stopped = 1; | |
1311 | return 0; | |
1312 | } | |
1313 | ||
1314 | errno = 0; | |
1315 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1316 | if (debug_linux_nat) | |
1317 | fprintf_unfiltered (gdb_stdlog, | |
1318 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1319 | target_pid_to_str (lp->ptid), | |
1320 | errno ? safe_strerror (errno) : "OK"); | |
1321 | ||
1322 | return stop_wait_callback (lp, flush_mask); | |
1323 | } | |
1324 | ||
1325 | if (WSTOPSIG (status) != SIGSTOP) | |
1326 | { | |
1327 | if (WSTOPSIG (status) == SIGTRAP) | |
1328 | { | |
1329 | /* If a LWP other than the LWP that we're reporting an | |
1330 | event for has hit a GDB breakpoint (as opposed to | |
1331 | some random trap signal), then just arrange for it to | |
1332 | hit it again later. We don't keep the SIGTRAP status | |
1333 | and don't forward the SIGTRAP signal to the LWP. We | |
1334 | will handle the current event, eventually we will | |
1335 | resume all LWPs, and this one will get its breakpoint | |
1336 | trap again. | |
1337 | ||
1338 | If we do not do this, then we run the risk that the | |
1339 | user will delete or disable the breakpoint, but the | |
1340 | thread will have already tripped on it. */ | |
1341 | ||
1342 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1343 | errno = 0; | |
1344 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1345 | if (debug_linux_nat) | |
1346 | { | |
1347 | fprintf_unfiltered (gdb_stdlog, | |
1348 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1349 | target_pid_to_str (lp->ptid), | |
1350 | errno ? safe_strerror (errno) : "OK"); | |
1351 | ||
1352 | fprintf_unfiltered (gdb_stdlog, | |
1353 | "SWC: Candidate SIGTRAP event in %s\n", | |
1354 | target_pid_to_str (lp->ptid)); | |
1355 | } | |
1356 | /* Hold the SIGTRAP for handling by linux_nat_wait. */ | |
1357 | stop_wait_callback (lp, data); | |
1358 | /* If there's another event, throw it back into the queue. */ | |
1359 | if (lp->status) | |
1360 | { | |
1361 | if (debug_linux_nat) | |
1362 | { | |
1363 | fprintf_unfiltered (gdb_stdlog, | |
1364 | "SWC: kill %s, %s\n", | |
1365 | target_pid_to_str (lp->ptid), | |
1366 | status_to_str ((int) status)); | |
1367 | } | |
1368 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
1369 | } | |
1370 | /* Save the sigtrap event. */ | |
1371 | lp->status = status; | |
1372 | return 0; | |
1373 | } | |
1374 | else | |
1375 | { | |
1376 | /* The thread was stopped with a signal other than | |
1377 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
1378 | ||
1379 | if (debug_linux_nat) | |
1380 | { | |
1381 | fprintf_unfiltered (gdb_stdlog, | |
1382 | "SWC: Pending event %s in %s\n", | |
1383 | status_to_str ((int) status), | |
1384 | target_pid_to_str (lp->ptid)); | |
1385 | } | |
1386 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1387 | errno = 0; | |
1388 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1389 | if (debug_linux_nat) | |
1390 | fprintf_unfiltered (gdb_stdlog, | |
1391 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
1392 | target_pid_to_str (lp->ptid), | |
1393 | errno ? safe_strerror (errno) : "OK"); | |
1394 | ||
1395 | /* Hold this event/waitstatus while we check to see if | |
1396 | there are any more (we still want to get that SIGSTOP). */ | |
1397 | stop_wait_callback (lp, data); | |
1398 | /* If the lp->status field is still empty, use it to hold | |
1399 | this event. If not, then this event must be returned | |
1400 | to the event queue of the LWP. */ | |
1401 | if (lp->status == 0) | |
1402 | lp->status = status; | |
1403 | else | |
1404 | { | |
1405 | if (debug_linux_nat) | |
1406 | { | |
1407 | fprintf_unfiltered (gdb_stdlog, | |
1408 | "SWC: kill %s, %s\n", | |
1409 | target_pid_to_str (lp->ptid), | |
1410 | status_to_str ((int) status)); | |
1411 | } | |
1412 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
1413 | } | |
1414 | return 0; | |
1415 | } | |
1416 | } | |
1417 | else | |
1418 | { | |
1419 | /* We caught the SIGSTOP that we intended to catch, so | |
1420 | there's no SIGSTOP pending. */ | |
1421 | lp->stopped = 1; | |
1422 | lp->signalled = 0; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | /* Check whether PID has any pending signals in FLUSH_MASK. If so set | |
1430 | the appropriate bits in PENDING, and return 1 - otherwise return 0. */ | |
1431 | ||
1432 | static int | |
1433 | linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask) | |
1434 | { | |
1435 | sigset_t blocked, ignored; | |
1436 | int i; | |
1437 | ||
1438 | linux_proc_pending_signals (pid, pending, &blocked, &ignored); | |
1439 | ||
1440 | if (!flush_mask) | |
1441 | return 0; | |
1442 | ||
1443 | for (i = 1; i < NSIG; i++) | |
1444 | if (sigismember (pending, i)) | |
1445 | if (!sigismember (flush_mask, i) | |
1446 | || sigismember (&blocked, i) | |
1447 | || sigismember (&ignored, i)) | |
1448 | sigdelset (pending, i); | |
1449 | ||
1450 | if (sigisemptyset (pending)) | |
1451 | return 0; | |
1452 | ||
1453 | return 1; | |
1454 | } | |
1455 | ||
1456 | /* DATA is interpreted as a mask of signals to flush. If LP has | |
1457 | signals pending, and they are all in the flush mask, then arrange | |
1458 | to flush them. LP should be stopped, as should all other threads | |
1459 | it might share a signal queue with. */ | |
1460 | ||
1461 | static int | |
1462 | flush_callback (struct lwp_info *lp, void *data) | |
1463 | { | |
1464 | sigset_t *flush_mask = data; | |
1465 | sigset_t pending, intersection, blocked, ignored; | |
1466 | int pid, status; | |
1467 | ||
1468 | /* Normally, when an LWP exits, it is removed from the LWP list. The | |
1469 | last LWP isn't removed till later, however. So if there is only | |
1470 | one LWP on the list, make sure it's alive. */ | |
1471 | if (lwp_list == lp && lp->next == NULL) | |
1472 | if (!linux_nat_thread_alive (lp->ptid)) | |
1473 | return 0; | |
1474 | ||
1475 | /* Just because the LWP is stopped doesn't mean that new signals | |
1476 | can't arrive from outside, so this function must be careful of | |
1477 | race conditions. However, because all threads are stopped, we | |
1478 | can assume that the pending mask will not shrink unless we resume | |
1479 | the LWP, and that it will then get another signal. We can't | |
1480 | control which one, however. */ | |
1481 | ||
1482 | if (lp->status) | |
1483 | { | |
1484 | if (debug_linux_nat) | |
a3f17187 | 1485 | printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status); |
d6b0e80f AC |
1486 | if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status))) |
1487 | lp->status = 0; | |
1488 | } | |
1489 | ||
1490 | while (linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask)) | |
1491 | { | |
1492 | int ret; | |
1493 | ||
1494 | errno = 0; | |
1495 | ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1496 | if (debug_linux_nat) | |
1497 | fprintf_unfiltered (gdb_stderr, | |
1498 | "FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno); | |
1499 | ||
1500 | lp->stopped = 0; | |
1501 | stop_wait_callback (lp, flush_mask); | |
1502 | if (debug_linux_nat) | |
1503 | fprintf_unfiltered (gdb_stderr, | |
1504 | "FC: Wait finished; saved status is %d\n", | |
1505 | lp->status); | |
1506 | } | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | /* Return non-zero if LP has a wait status pending. */ | |
1512 | ||
1513 | static int | |
1514 | status_callback (struct lwp_info *lp, void *data) | |
1515 | { | |
1516 | /* Only report a pending wait status if we pretend that this has | |
1517 | indeed been resumed. */ | |
1518 | return (lp->status != 0 && lp->resumed); | |
1519 | } | |
1520 | ||
1521 | /* Return non-zero if LP isn't stopped. */ | |
1522 | ||
1523 | static int | |
1524 | running_callback (struct lwp_info *lp, void *data) | |
1525 | { | |
1526 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
1527 | } | |
1528 | ||
1529 | /* Count the LWP's that have had events. */ | |
1530 | ||
1531 | static int | |
1532 | count_events_callback (struct lwp_info *lp, void *data) | |
1533 | { | |
1534 | int *count = data; | |
1535 | ||
1536 | gdb_assert (count != NULL); | |
1537 | ||
1538 | /* Count only LWPs that have a SIGTRAP event pending. */ | |
1539 | if (lp->status != 0 | |
1540 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1541 | (*count)++; | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1547 | ||
1548 | static int | |
1549 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
1550 | { | |
1551 | if (lp->step && lp->status != 0) | |
1552 | return 1; | |
1553 | else | |
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
1558 | ||
1559 | static int | |
1560 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
1561 | { | |
1562 | int *selector = data; | |
1563 | ||
1564 | gdb_assert (selector != NULL); | |
1565 | ||
1566 | /* Select only LWPs that have a SIGTRAP event pending. */ | |
1567 | if (lp->status != 0 | |
1568 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1569 | if ((*selector)-- == 0) | |
1570 | return 1; | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static int | |
1576 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
1577 | { | |
1578 | struct lwp_info *event_lp = data; | |
1579 | ||
1580 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1581 | if (lp == event_lp) | |
1582 | return 0; | |
1583 | ||
1584 | /* If a LWP other than the LWP that we're reporting an event for has | |
1585 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1586 | then just arrange for it to hit it again later. We don't keep | |
1587 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1588 | LWP. We will handle the current event, eventually we will resume | |
1589 | all LWPs, and this one will get its breakpoint trap again. | |
1590 | ||
1591 | If we do not do this, then we run the risk that the user will | |
1592 | delete or disable the breakpoint, but the LWP will have already | |
1593 | tripped on it. */ | |
1594 | ||
1595 | if (lp->status != 0 | |
1596 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
1597 | && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) - | |
1598 | DECR_PC_AFTER_BREAK)) | |
1599 | { | |
1600 | if (debug_linux_nat) | |
1601 | fprintf_unfiltered (gdb_stdlog, | |
1602 | "CBC: Push back breakpoint for %s\n", | |
1603 | target_pid_to_str (lp->ptid)); | |
1604 | ||
1605 | /* Back up the PC if necessary. */ | |
1606 | if (DECR_PC_AFTER_BREAK) | |
1607 | write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid); | |
1608 | ||
1609 | /* Throw away the SIGTRAP. */ | |
1610 | lp->status = 0; | |
1611 | } | |
1612 | ||
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | /* Select one LWP out of those that have events pending. */ | |
1617 | ||
1618 | static void | |
1619 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
1620 | { | |
1621 | int num_events = 0; | |
1622 | int random_selector; | |
1623 | struct lwp_info *event_lp; | |
1624 | ||
1625 | /* Record the wait status for the origional LWP. */ | |
1626 | (*orig_lp)->status = *status; | |
1627 | ||
1628 | /* Give preference to any LWP that is being single-stepped. */ | |
1629 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
1630 | if (event_lp != NULL) | |
1631 | { | |
1632 | if (debug_linux_nat) | |
1633 | fprintf_unfiltered (gdb_stdlog, | |
1634 | "SEL: Select single-step %s\n", | |
1635 | target_pid_to_str (event_lp->ptid)); | |
1636 | } | |
1637 | else | |
1638 | { | |
1639 | /* No single-stepping LWP. Select one at random, out of those | |
1640 | which have had SIGTRAP events. */ | |
1641 | ||
1642 | /* First see how many SIGTRAP events we have. */ | |
1643 | iterate_over_lwps (count_events_callback, &num_events); | |
1644 | ||
1645 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1646 | random_selector = (int) | |
1647 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1648 | ||
1649 | if (debug_linux_nat && num_events > 1) | |
1650 | fprintf_unfiltered (gdb_stdlog, | |
1651 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1652 | num_events, random_selector); | |
1653 | ||
1654 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
1655 | &random_selector); | |
1656 | } | |
1657 | ||
1658 | if (event_lp != NULL) | |
1659 | { | |
1660 | /* Switch the event LWP. */ | |
1661 | *orig_lp = event_lp; | |
1662 | *status = event_lp->status; | |
1663 | } | |
1664 | ||
1665 | /* Flush the wait status for the event LWP. */ | |
1666 | (*orig_lp)->status = 0; | |
1667 | } | |
1668 | ||
1669 | /* Return non-zero if LP has been resumed. */ | |
1670 | ||
1671 | static int | |
1672 | resumed_callback (struct lwp_info *lp, void *data) | |
1673 | { | |
1674 | return lp->resumed; | |
1675 | } | |
1676 | ||
1677 | #ifdef CHILD_WAIT | |
1678 | ||
1679 | /* We need to override child_wait to support attaching to cloned | |
1680 | processes, since a normal wait (as done by the default version) | |
1681 | ignores those processes. */ | |
1682 | ||
1683 | /* Wait for child PTID to do something. Return id of the child, | |
1684 | minus_one_ptid in case of error; store status into *OURSTATUS. */ | |
1685 | ||
1686 | ptid_t | |
1687 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
1688 | { | |
1689 | int save_errno; | |
1690 | int status; | |
1691 | pid_t pid; | |
1692 | ||
1693 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1694 | ||
1695 | do | |
1696 | { | |
1697 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
1698 | attached process. */ | |
1699 | set_sigio_trap (); | |
1700 | ||
1701 | pid = waitpid (GET_PID (ptid), &status, 0); | |
1702 | if (pid == -1 && errno == ECHILD) | |
1703 | /* Try again with __WCLONE to check cloned processes. */ | |
1704 | pid = waitpid (GET_PID (ptid), &status, __WCLONE); | |
1705 | ||
1706 | if (debug_linux_nat) | |
1707 | { | |
1708 | fprintf_unfiltered (gdb_stdlog, | |
1709 | "CW: waitpid %ld received %s\n", | |
1710 | (long) pid, status_to_str (status)); | |
1711 | } | |
1712 | ||
1713 | save_errno = errno; | |
1714 | ||
1715 | /* Make sure we don't report an event for the exit of the | |
1716 | original program, if we've detached from it. */ | |
1717 | if (pid != -1 && !WIFSTOPPED (status) && pid != GET_PID (inferior_ptid)) | |
1718 | { | |
1719 | pid = -1; | |
1720 | save_errno = EINTR; | |
1721 | } | |
1722 | ||
1723 | /* Check for stop events reported by a process we didn't already | |
1724 | know about - in this case, anything other than inferior_ptid. | |
1725 | ||
1726 | If we're expecting to receive stopped processes after fork, | |
1727 | vfork, and clone events, then we'll just add the new one to | |
1728 | our list and go back to waiting for the event to be reported | |
1729 | - the stopped process might be returned from waitpid before | |
1730 | or after the event is. If we want to handle debugging of | |
1731 | CLONE_PTRACE processes we need to do more here, i.e. switch | |
1732 | to multi-threaded mode. */ | |
1733 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP | |
1734 | && pid != GET_PID (inferior_ptid)) | |
1735 | { | |
1736 | linux_record_stopped_pid (pid); | |
1737 | pid = -1; | |
1738 | save_errno = EINTR; | |
1739 | } | |
1740 | ||
1741 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1742 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP | |
1743 | && status >> 16 != 0) | |
1744 | { | |
1745 | linux_handle_extended_wait (pid, status, ourstatus); | |
1746 | ||
1747 | /* If we see a clone event, detach the child, and don't | |
1748 | report the event. It would be nice to offer some way to | |
1749 | switch into a non-thread-db based threaded mode at this | |
1750 | point. */ | |
1751 | if (ourstatus->kind == TARGET_WAITKIND_SPURIOUS) | |
1752 | { | |
1753 | ptrace (PTRACE_DETACH, ourstatus->value.related_pid, 0, 0); | |
1754 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1755 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1756 | pid = -1; | |
1757 | save_errno = EINTR; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | clear_sigio_trap (); | |
1762 | clear_sigint_trap (); | |
1763 | } | |
1764 | while (pid == -1 && save_errno == EINTR); | |
1765 | ||
1766 | if (pid == -1) | |
1767 | { | |
8a3fe4f8 | 1768 | warning (_("Child process unexpectedly missing: %s"), |
d6b0e80f AC |
1769 | safe_strerror (errno)); |
1770 | ||
1771 | /* Claim it exited with unknown signal. */ | |
1772 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1773 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
1774 | return minus_one_ptid; | |
1775 | } | |
1776 | ||
1777 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) | |
1778 | store_waitstatus (ourstatus, status); | |
1779 | ||
1780 | return pid_to_ptid (pid); | |
1781 | } | |
1782 | ||
1783 | #endif | |
1784 | ||
1785 | /* Stop an active thread, verify it still exists, then resume it. */ | |
1786 | ||
1787 | static int | |
1788 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
1789 | { | |
1790 | struct lwp_info *ptr; | |
1791 | ||
1792 | if (!lp->stopped && !lp->signalled) | |
1793 | { | |
1794 | stop_callback (lp, NULL); | |
1795 | stop_wait_callback (lp, NULL); | |
1796 | /* Resume if the lwp still exists. */ | |
1797 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
1798 | if (lp == ptr) | |
1799 | { | |
1800 | resume_callback (lp, NULL); | |
1801 | resume_set_callback (lp, NULL); | |
1802 | } | |
1803 | } | |
1804 | return 0; | |
1805 | } | |
1806 | ||
1807 | static ptid_t | |
1808 | linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
1809 | { | |
1810 | struct lwp_info *lp = NULL; | |
1811 | int options = 0; | |
1812 | int status = 0; | |
1813 | pid_t pid = PIDGET (ptid); | |
1814 | sigset_t flush_mask; | |
1815 | ||
1816 | sigemptyset (&flush_mask); | |
1817 | ||
1818 | /* Make sure SIGCHLD is blocked. */ | |
1819 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1820 | { | |
1821 | sigaddset (&blocked_mask, SIGCHLD); | |
1822 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
1823 | } | |
1824 | ||
1825 | retry: | |
1826 | ||
1827 | /* Make sure there is at least one LWP that has been resumed, at | |
1828 | least if there are any LWPs at all. */ | |
1829 | gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL)); | |
1830 | ||
1831 | /* First check if there is a LWP with a wait status pending. */ | |
1832 | if (pid == -1) | |
1833 | { | |
1834 | /* Any LWP that's been resumed will do. */ | |
1835 | lp = iterate_over_lwps (status_callback, NULL); | |
1836 | if (lp) | |
1837 | { | |
1838 | status = lp->status; | |
1839 | lp->status = 0; | |
1840 | ||
1841 | if (debug_linux_nat && status) | |
1842 | fprintf_unfiltered (gdb_stdlog, | |
1843 | "LLW: Using pending wait status %s for %s.\n", | |
1844 | status_to_str (status), | |
1845 | target_pid_to_str (lp->ptid)); | |
1846 | } | |
1847 | ||
1848 | /* But if we don't fine one, we'll have to wait, and check both | |
1849 | cloned and uncloned processes. We start with the cloned | |
1850 | processes. */ | |
1851 | options = __WCLONE | WNOHANG; | |
1852 | } | |
1853 | else if (is_lwp (ptid)) | |
1854 | { | |
1855 | if (debug_linux_nat) | |
1856 | fprintf_unfiltered (gdb_stdlog, | |
1857 | "LLW: Waiting for specific LWP %s.\n", | |
1858 | target_pid_to_str (ptid)); | |
1859 | ||
1860 | /* We have a specific LWP to check. */ | |
1861 | lp = find_lwp_pid (ptid); | |
1862 | gdb_assert (lp); | |
1863 | status = lp->status; | |
1864 | lp->status = 0; | |
1865 | ||
1866 | if (debug_linux_nat && status) | |
1867 | fprintf_unfiltered (gdb_stdlog, | |
1868 | "LLW: Using pending wait status %s for %s.\n", | |
1869 | status_to_str (status), | |
1870 | target_pid_to_str (lp->ptid)); | |
1871 | ||
1872 | /* If we have to wait, take into account whether PID is a cloned | |
1873 | process or not. And we have to convert it to something that | |
1874 | the layer beneath us can understand. */ | |
1875 | options = lp->cloned ? __WCLONE : 0; | |
1876 | pid = GET_LWP (ptid); | |
1877 | } | |
1878 | ||
1879 | if (status && lp->signalled) | |
1880 | { | |
1881 | /* A pending SIGSTOP may interfere with the normal stream of | |
1882 | events. In a typical case where interference is a problem, | |
1883 | we have a SIGSTOP signal pending for LWP A while | |
1884 | single-stepping it, encounter an event in LWP B, and take the | |
1885 | pending SIGSTOP while trying to stop LWP A. After processing | |
1886 | the event in LWP B, LWP A is continued, and we'll never see | |
1887 | the SIGTRAP associated with the last time we were | |
1888 | single-stepping LWP A. */ | |
1889 | ||
1890 | /* Resume the thread. It should halt immediately returning the | |
1891 | pending SIGSTOP. */ | |
1892 | registers_changed (); | |
1893 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, | |
1894 | TARGET_SIGNAL_0); | |
1895 | if (debug_linux_nat) | |
1896 | fprintf_unfiltered (gdb_stdlog, | |
1897 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
1898 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1899 | target_pid_to_str (lp->ptid)); | |
1900 | lp->stopped = 0; | |
1901 | gdb_assert (lp->resumed); | |
1902 | ||
1903 | /* This should catch the pending SIGSTOP. */ | |
1904 | stop_wait_callback (lp, NULL); | |
1905 | } | |
1906 | ||
1907 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
1908 | attached process. */ | |
1909 | set_sigio_trap (); | |
1910 | ||
1911 | while (status == 0) | |
1912 | { | |
1913 | pid_t lwpid; | |
1914 | ||
1915 | lwpid = waitpid (pid, &status, options); | |
1916 | if (lwpid > 0) | |
1917 | { | |
1918 | gdb_assert (pid == -1 || lwpid == pid); | |
1919 | ||
1920 | if (debug_linux_nat) | |
1921 | { | |
1922 | fprintf_unfiltered (gdb_stdlog, | |
1923 | "LLW: waitpid %ld received %s\n", | |
1924 | (long) lwpid, status_to_str (status)); | |
1925 | } | |
1926 | ||
1927 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1928 | ||
1929 | /* Check for stop events reported by a process we didn't | |
1930 | already know about - anything not already in our LWP | |
1931 | list. | |
1932 | ||
1933 | If we're expecting to receive stopped processes after | |
1934 | fork, vfork, and clone events, then we'll just add the | |
1935 | new one to our list and go back to waiting for the event | |
1936 | to be reported - the stopped process might be returned | |
1937 | from waitpid before or after the event is. */ | |
1938 | if (WIFSTOPPED (status) && !lp) | |
1939 | { | |
1940 | linux_record_stopped_pid (lwpid); | |
1941 | status = 0; | |
1942 | continue; | |
1943 | } | |
1944 | ||
1945 | /* Make sure we don't report an event for the exit of an LWP not in | |
1946 | our list, i.e. not part of the current process. This can happen | |
1947 | if we detach from a program we original forked and then it | |
1948 | exits. */ | |
1949 | if (!WIFSTOPPED (status) && !lp) | |
1950 | { | |
1951 | status = 0; | |
1952 | continue; | |
1953 | } | |
1954 | ||
1955 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
1956 | CLONE_PTRACE processes which do not use the thread library - | |
1957 | otherwise we wouldn't find the new LWP this way. That doesn't | |
1958 | currently work, and the following code is currently unreachable | |
1959 | due to the two blocks above. If it's fixed some day, this code | |
1960 | should be broken out into a function so that we can also pick up | |
1961 | LWPs from the new interface. */ | |
1962 | if (!lp) | |
1963 | { | |
1964 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
1965 | if (options & __WCLONE) | |
1966 | lp->cloned = 1; | |
1967 | ||
1968 | if (threaded) | |
1969 | { | |
1970 | gdb_assert (WIFSTOPPED (status) | |
1971 | && WSTOPSIG (status) == SIGSTOP); | |
1972 | lp->signalled = 1; | |
1973 | ||
1974 | if (!in_thread_list (inferior_ptid)) | |
1975 | { | |
1976 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
1977 | GET_PID (inferior_ptid)); | |
1978 | add_thread (inferior_ptid); | |
1979 | } | |
1980 | ||
1981 | add_thread (lp->ptid); | |
a3f17187 | 1982 | printf_unfiltered (_("[New %s]\n"), |
d6b0e80f AC |
1983 | target_pid_to_str (lp->ptid)); |
1984 | } | |
1985 | } | |
1986 | ||
1987 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1988 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1989 | { | |
1990 | if (debug_linux_nat) | |
1991 | fprintf_unfiltered (gdb_stdlog, | |
1992 | "LLW: Handling extended status 0x%06x\n", | |
1993 | status); | |
1994 | if (linux_nat_handle_extended (lp, status)) | |
1995 | { | |
1996 | status = 0; | |
1997 | continue; | |
1998 | } | |
1999 | } | |
2000 | ||
2001 | /* Check if the thread has exited. */ | |
2002 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2003 | { | |
2004 | if (in_thread_list (lp->ptid)) | |
2005 | { | |
2006 | /* Core GDB cannot deal with us deleting the current | |
2007 | thread. */ | |
2008 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
2009 | delete_thread (lp->ptid); | |
a3f17187 | 2010 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
2011 | target_pid_to_str (lp->ptid)); |
2012 | } | |
2013 | ||
2014 | /* If this is the main thread, we must stop all threads and | |
2015 | verify if they are still alive. This is because in the nptl | |
2016 | thread model, there is no signal issued for exiting LWPs | |
2017 | other than the main thread. We only get the main thread | |
2018 | exit signal once all child threads have already exited. | |
2019 | If we stop all the threads and use the stop_wait_callback | |
2020 | to check if they have exited we can determine whether this | |
2021 | signal should be ignored or whether it means the end of the | |
2022 | debugged application, regardless of which threading model | |
2023 | is being used. */ | |
2024 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) | |
2025 | { | |
2026 | lp->stopped = 1; | |
2027 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2028 | } | |
2029 | ||
2030 | if (debug_linux_nat) | |
2031 | fprintf_unfiltered (gdb_stdlog, | |
2032 | "LLW: %s exited.\n", | |
2033 | target_pid_to_str (lp->ptid)); | |
2034 | ||
2035 | delete_lwp (lp->ptid); | |
2036 | ||
2037 | /* If there is at least one more LWP, then the exit signal | |
2038 | was not the end of the debugged application and should be | |
2039 | ignored. */ | |
2040 | if (num_lwps > 0) | |
2041 | { | |
2042 | /* Make sure there is at least one thread running. */ | |
2043 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2044 | ||
2045 | /* Discard the event. */ | |
2046 | status = 0; | |
2047 | continue; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | /* Check if the current LWP has previously exited. In the nptl | |
2052 | thread model, LWPs other than the main thread do not issue | |
2053 | signals when they exit so we must check whenever the thread | |
2054 | has stopped. A similar check is made in stop_wait_callback(). */ | |
2055 | if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid)) | |
2056 | { | |
2057 | if (in_thread_list (lp->ptid)) | |
2058 | { | |
2059 | /* Core GDB cannot deal with us deleting the current | |
2060 | thread. */ | |
2061 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
2062 | delete_thread (lp->ptid); | |
a3f17187 | 2063 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
2064 | target_pid_to_str (lp->ptid)); |
2065 | } | |
2066 | if (debug_linux_nat) | |
2067 | fprintf_unfiltered (gdb_stdlog, | |
2068 | "LLW: %s exited.\n", | |
2069 | target_pid_to_str (lp->ptid)); | |
2070 | ||
2071 | delete_lwp (lp->ptid); | |
2072 | ||
2073 | /* Make sure there is at least one thread running. */ | |
2074 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2075 | ||
2076 | /* Discard the event. */ | |
2077 | status = 0; | |
2078 | continue; | |
2079 | } | |
2080 | ||
2081 | /* Make sure we don't report a SIGSTOP that we sent | |
2082 | ourselves in an attempt to stop an LWP. */ | |
2083 | if (lp->signalled | |
2084 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2085 | { | |
2086 | if (debug_linux_nat) | |
2087 | fprintf_unfiltered (gdb_stdlog, | |
2088 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2089 | target_pid_to_str (lp->ptid)); | |
2090 | ||
2091 | /* This is a delayed SIGSTOP. */ | |
2092 | lp->signalled = 0; | |
2093 | ||
2094 | registers_changed (); | |
2095 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, | |
2096 | TARGET_SIGNAL_0); | |
2097 | if (debug_linux_nat) | |
2098 | fprintf_unfiltered (gdb_stdlog, | |
2099 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2100 | lp->step ? | |
2101 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2102 | target_pid_to_str (lp->ptid)); | |
2103 | ||
2104 | lp->stopped = 0; | |
2105 | gdb_assert (lp->resumed); | |
2106 | ||
2107 | /* Discard the event. */ | |
2108 | status = 0; | |
2109 | continue; | |
2110 | } | |
2111 | ||
2112 | break; | |
2113 | } | |
2114 | ||
2115 | if (pid == -1) | |
2116 | { | |
2117 | /* Alternate between checking cloned and uncloned processes. */ | |
2118 | options ^= __WCLONE; | |
2119 | ||
2120 | /* And suspend every time we have checked both. */ | |
2121 | if (options & __WCLONE) | |
2122 | sigsuspend (&suspend_mask); | |
2123 | } | |
2124 | ||
2125 | /* We shouldn't end up here unless we want to try again. */ | |
2126 | gdb_assert (status == 0); | |
2127 | } | |
2128 | ||
2129 | clear_sigio_trap (); | |
2130 | clear_sigint_trap (); | |
2131 | ||
2132 | gdb_assert (lp); | |
2133 | ||
2134 | /* Don't report signals that GDB isn't interested in, such as | |
2135 | signals that are neither printed nor stopped upon. Stopping all | |
2136 | threads can be a bit time-consuming so if we want decent | |
2137 | performance with heavily multi-threaded programs, especially when | |
2138 | they're using a high frequency timer, we'd better avoid it if we | |
2139 | can. */ | |
2140 | ||
2141 | if (WIFSTOPPED (status)) | |
2142 | { | |
2143 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
2144 | ||
2145 | if (signal_stop_state (signo) == 0 | |
2146 | && signal_print_state (signo) == 0 | |
2147 | && signal_pass_state (signo) == 1) | |
2148 | { | |
2149 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2150 | here? It is not clear we should. GDB may not expect | |
2151 | other threads to run. On the other hand, not resuming | |
2152 | newly attached threads may cause an unwanted delay in | |
2153 | getting them running. */ | |
2154 | registers_changed (); | |
2155 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo); | |
2156 | if (debug_linux_nat) | |
2157 | fprintf_unfiltered (gdb_stdlog, | |
2158 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2159 | lp->step ? | |
2160 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2161 | target_pid_to_str (lp->ptid), | |
2162 | signo ? strsignal (signo) : "0"); | |
2163 | lp->stopped = 0; | |
2164 | status = 0; | |
2165 | goto retry; | |
2166 | } | |
2167 | ||
2168 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2169 | { | |
2170 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
2171 | forwarded to the entire process group, that is, all LWP's | |
2172 | will receive it. Since we only want to report it once, | |
2173 | we try to flush it from all LWPs except this one. */ | |
2174 | sigaddset (&flush_mask, SIGINT); | |
2175 | } | |
2176 | } | |
2177 | ||
2178 | /* This LWP is stopped now. */ | |
2179 | lp->stopped = 1; | |
2180 | ||
2181 | if (debug_linux_nat) | |
2182 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
2183 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
2184 | ||
2185 | /* Now stop all other LWP's ... */ | |
2186 | iterate_over_lwps (stop_callback, NULL); | |
2187 | ||
2188 | /* ... and wait until all of them have reported back that they're no | |
2189 | longer running. */ | |
2190 | iterate_over_lwps (stop_wait_callback, &flush_mask); | |
2191 | iterate_over_lwps (flush_callback, &flush_mask); | |
2192 | ||
2193 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
2194 | among those that have had events. Giving equal priority to all | |
2195 | LWPs that have had events helps prevent starvation. */ | |
2196 | if (pid == -1) | |
2197 | select_event_lwp (&lp, &status); | |
2198 | ||
2199 | /* Now that we've selected our final event LWP, cancel any | |
2200 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
2201 | the comment in cancel_breakpoints_callback to find out why. */ | |
2202 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
2203 | ||
2204 | /* If we're not running in "threaded" mode, we'll report the bare | |
2205 | process id. */ | |
2206 | ||
2207 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2208 | { | |
2209 | trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2210 | if (debug_linux_nat) | |
2211 | fprintf_unfiltered (gdb_stdlog, | |
2212 | "LLW: trap_ptid is %s.\n", | |
2213 | target_pid_to_str (trap_ptid)); | |
2214 | } | |
2215 | else | |
2216 | trap_ptid = null_ptid; | |
2217 | ||
2218 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2219 | { | |
2220 | *ourstatus = lp->waitstatus; | |
2221 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
2222 | } | |
2223 | else | |
2224 | store_waitstatus (ourstatus, status); | |
2225 | ||
2226 | return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2227 | } | |
2228 | ||
2229 | static int | |
2230 | kill_callback (struct lwp_info *lp, void *data) | |
2231 | { | |
2232 | errno = 0; | |
2233 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
2234 | if (debug_linux_nat) | |
2235 | fprintf_unfiltered (gdb_stdlog, | |
2236 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
2237 | target_pid_to_str (lp->ptid), | |
2238 | errno ? safe_strerror (errno) : "OK"); | |
2239 | ||
2240 | return 0; | |
2241 | } | |
2242 | ||
2243 | static int | |
2244 | kill_wait_callback (struct lwp_info *lp, void *data) | |
2245 | { | |
2246 | pid_t pid; | |
2247 | ||
2248 | /* We must make sure that there are no pending events (delayed | |
2249 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
2250 | program doesn't interfere with any following debugging session. */ | |
2251 | ||
2252 | /* For cloned processes we must check both with __WCLONE and | |
2253 | without, since the exit status of a cloned process isn't reported | |
2254 | with __WCLONE. */ | |
2255 | if (lp->cloned) | |
2256 | { | |
2257 | do | |
2258 | { | |
2259 | pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); | |
2260 | if (pid != (pid_t) -1 && debug_linux_nat) | |
2261 | { | |
2262 | fprintf_unfiltered (gdb_stdlog, | |
2263 | "KWC: wait %s received unknown.\n", | |
2264 | target_pid_to_str (lp->ptid)); | |
2265 | } | |
2266 | } | |
2267 | while (pid == GET_LWP (lp->ptid)); | |
2268 | ||
2269 | gdb_assert (pid == -1 && errno == ECHILD); | |
2270 | } | |
2271 | ||
2272 | do | |
2273 | { | |
2274 | pid = waitpid (GET_LWP (lp->ptid), NULL, 0); | |
2275 | if (pid != (pid_t) -1 && debug_linux_nat) | |
2276 | { | |
2277 | fprintf_unfiltered (gdb_stdlog, | |
2278 | "KWC: wait %s received unk.\n", | |
2279 | target_pid_to_str (lp->ptid)); | |
2280 | } | |
2281 | } | |
2282 | while (pid == GET_LWP (lp->ptid)); | |
2283 | ||
2284 | gdb_assert (pid == -1 && errno == ECHILD); | |
2285 | return 0; | |
2286 | } | |
2287 | ||
2288 | static void | |
2289 | linux_nat_kill (void) | |
2290 | { | |
2291 | /* Kill all LWP's ... */ | |
2292 | iterate_over_lwps (kill_callback, NULL); | |
2293 | ||
2294 | /* ... and wait until we've flushed all events. */ | |
2295 | iterate_over_lwps (kill_wait_callback, NULL); | |
2296 | ||
2297 | target_mourn_inferior (); | |
2298 | } | |
2299 | ||
2300 | static void | |
2301 | linux_nat_create_inferior (char *exec_file, char *allargs, char **env, | |
2302 | int from_tty) | |
2303 | { | |
1df84f13 | 2304 | deprecated_child_ops.to_create_inferior (exec_file, allargs, env, from_tty); |
d6b0e80f AC |
2305 | } |
2306 | ||
2307 | static void | |
2308 | linux_nat_mourn_inferior (void) | |
2309 | { | |
2310 | trap_ptid = null_ptid; | |
2311 | ||
2312 | /* Destroy LWP info; it's no longer valid. */ | |
2313 | init_lwp_list (); | |
2314 | ||
2315 | /* Restore the original signal mask. */ | |
2316 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
2317 | sigemptyset (&blocked_mask); | |
2318 | ||
1df84f13 | 2319 | deprecated_child_ops.to_mourn_inferior (); |
d6b0e80f AC |
2320 | } |
2321 | ||
2322 | static int | |
2323 | linux_nat_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
2324 | struct mem_attrib *attrib, struct target_ops *target) | |
2325 | { | |
2326 | struct cleanup *old_chain = save_inferior_ptid (); | |
2327 | int xfer; | |
2328 | ||
2329 | if (is_lwp (inferior_ptid)) | |
2330 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
2331 | ||
2332 | xfer = linux_proc_xfer_memory (memaddr, myaddr, len, write, attrib, target); | |
2333 | if (xfer == 0) | |
2334 | xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target); | |
2335 | ||
2336 | do_cleanups (old_chain); | |
2337 | return xfer; | |
2338 | } | |
2339 | ||
2340 | static int | |
2341 | linux_nat_thread_alive (ptid_t ptid) | |
2342 | { | |
2343 | gdb_assert (is_lwp (ptid)); | |
2344 | ||
2345 | errno = 0; | |
2346 | ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0); | |
2347 | if (debug_linux_nat) | |
2348 | fprintf_unfiltered (gdb_stdlog, | |
2349 | "LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n", | |
2350 | target_pid_to_str (ptid), | |
2351 | errno ? safe_strerror (errno) : "OK"); | |
2352 | if (errno) | |
2353 | return 0; | |
2354 | ||
2355 | return 1; | |
2356 | } | |
2357 | ||
2358 | static char * | |
2359 | linux_nat_pid_to_str (ptid_t ptid) | |
2360 | { | |
2361 | static char buf[64]; | |
2362 | ||
2363 | if (is_lwp (ptid)) | |
2364 | { | |
2365 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
2366 | return buf; | |
2367 | } | |
2368 | ||
2369 | return normal_pid_to_str (ptid); | |
2370 | } | |
2371 | ||
2372 | static void | |
2373 | init_linux_nat_ops (void) | |
2374 | { | |
2375 | #if 0 | |
2376 | linux_nat_ops.to_open = linux_nat_open; | |
2377 | #endif | |
2378 | linux_nat_ops.to_shortname = "lwp-layer"; | |
2379 | linux_nat_ops.to_longname = "lwp-layer"; | |
2380 | linux_nat_ops.to_doc = "Low level threads support (LWP layer)"; | |
2381 | linux_nat_ops.to_attach = linux_nat_attach; | |
2382 | linux_nat_ops.to_detach = linux_nat_detach; | |
2383 | linux_nat_ops.to_resume = linux_nat_resume; | |
2384 | linux_nat_ops.to_wait = linux_nat_wait; | |
2385 | /* fetch_inferior_registers and store_inferior_registers will | |
2386 | honor the LWP id, so we can use them directly. */ | |
2387 | linux_nat_ops.to_fetch_registers = fetch_inferior_registers; | |
2388 | linux_nat_ops.to_store_registers = store_inferior_registers; | |
c8e73a31 | 2389 | linux_nat_ops.deprecated_xfer_memory = linux_nat_xfer_memory; |
d6b0e80f AC |
2390 | linux_nat_ops.to_kill = linux_nat_kill; |
2391 | linux_nat_ops.to_create_inferior = linux_nat_create_inferior; | |
2392 | linux_nat_ops.to_mourn_inferior = linux_nat_mourn_inferior; | |
2393 | linux_nat_ops.to_thread_alive = linux_nat_thread_alive; | |
2394 | linux_nat_ops.to_pid_to_str = linux_nat_pid_to_str; | |
2395 | linux_nat_ops.to_post_startup_inferior = child_post_startup_inferior; | |
2396 | linux_nat_ops.to_post_attach = child_post_attach; | |
2397 | linux_nat_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
2398 | linux_nat_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
2399 | linux_nat_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
2400 | ||
2401 | linux_nat_ops.to_stratum = thread_stratum; | |
2402 | linux_nat_ops.to_has_thread_control = tc_schedlock; | |
2403 | linux_nat_ops.to_magic = OPS_MAGIC; | |
2404 | } | |
2405 | ||
2406 | static void | |
2407 | sigchld_handler (int signo) | |
2408 | { | |
2409 | /* Do nothing. The only reason for this handler is that it allows | |
2410 | us to use sigsuspend in linux_nat_wait above to wait for the | |
2411 | arrival of a SIGCHLD. */ | |
2412 | } | |
2413 | ||
dba24537 AC |
2414 | /* Accepts an integer PID; Returns a string representing a file that |
2415 | can be opened to get the symbols for the child process. */ | |
2416 | ||
2417 | char * | |
2418 | child_pid_to_exec_file (int pid) | |
2419 | { | |
2420 | char *name1, *name2; | |
2421 | ||
2422 | name1 = xmalloc (MAXPATHLEN); | |
2423 | name2 = xmalloc (MAXPATHLEN); | |
2424 | make_cleanup (xfree, name1); | |
2425 | make_cleanup (xfree, name2); | |
2426 | memset (name2, 0, MAXPATHLEN); | |
2427 | ||
2428 | sprintf (name1, "/proc/%d/exe", pid); | |
2429 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
2430 | return name2; | |
2431 | else | |
2432 | return name1; | |
2433 | } | |
2434 | ||
2435 | /* Service function for corefiles and info proc. */ | |
2436 | ||
2437 | static int | |
2438 | read_mapping (FILE *mapfile, | |
2439 | long long *addr, | |
2440 | long long *endaddr, | |
2441 | char *permissions, | |
2442 | long long *offset, | |
2443 | char *device, long long *inode, char *filename) | |
2444 | { | |
2445 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
2446 | addr, endaddr, permissions, offset, device, inode); | |
2447 | ||
2448 | if (ret > 0 && ret != EOF && *inode != 0) | |
2449 | { | |
2450 | /* Eat everything up to EOL for the filename. This will prevent | |
2451 | weird filenames (such as one with embedded whitespace) from | |
2452 | confusing this code. It also makes this code more robust in | |
2453 | respect to annotations the kernel may add after the filename. | |
2454 | ||
2455 | Note the filename is used for informational purposes | |
2456 | only. */ | |
2457 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
2458 | } | |
2459 | else | |
2460 | { | |
2461 | filename[0] = '\0'; /* no filename */ | |
2462 | fscanf (mapfile, "\n"); | |
2463 | } | |
2464 | return (ret != 0 && ret != EOF); | |
2465 | } | |
2466 | ||
2467 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
2468 | regions in the inferior for a corefile. */ | |
2469 | ||
2470 | static int | |
2471 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
2472 | unsigned long, | |
2473 | int, int, int, void *), void *obfd) | |
2474 | { | |
2475 | long long pid = PIDGET (inferior_ptid); | |
2476 | char mapsfilename[MAXPATHLEN]; | |
2477 | FILE *mapsfile; | |
2478 | long long addr, endaddr, size, offset, inode; | |
2479 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2480 | int read, write, exec; | |
2481 | int ret; | |
2482 | ||
2483 | /* Compose the filename for the /proc memory map, and open it. */ | |
2484 | sprintf (mapsfilename, "/proc/%lld/maps", pid); | |
2485 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) | |
8a3fe4f8 | 2486 | error (_("Could not open %s."), mapsfilename); |
dba24537 AC |
2487 | |
2488 | if (info_verbose) | |
2489 | fprintf_filtered (gdb_stdout, | |
2490 | "Reading memory regions from %s\n", mapsfilename); | |
2491 | ||
2492 | /* Now iterate until end-of-file. */ | |
2493 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
2494 | &offset, &device[0], &inode, &filename[0])) | |
2495 | { | |
2496 | size = endaddr - addr; | |
2497 | ||
2498 | /* Get the segment's permissions. */ | |
2499 | read = (strchr (permissions, 'r') != 0); | |
2500 | write = (strchr (permissions, 'w') != 0); | |
2501 | exec = (strchr (permissions, 'x') != 0); | |
2502 | ||
2503 | if (info_verbose) | |
2504 | { | |
2505 | fprintf_filtered (gdb_stdout, | |
2506 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
2507 | size, paddr_nz (addr), | |
2508 | read ? 'r' : ' ', | |
2509 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
2510 | if (filename && filename[0]) | |
2511 | fprintf_filtered (gdb_stdout, " for %s", filename); | |
2512 | fprintf_filtered (gdb_stdout, "\n"); | |
2513 | } | |
2514 | ||
2515 | /* Invoke the callback function to create the corefile | |
2516 | segment. */ | |
2517 | func (addr, size, read, write, exec, obfd); | |
2518 | } | |
2519 | fclose (mapsfile); | |
2520 | return 0; | |
2521 | } | |
2522 | ||
2523 | /* Records the thread's register state for the corefile note | |
2524 | section. */ | |
2525 | ||
2526 | static char * | |
2527 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2528 | char *note_data, int *note_size) | |
2529 | { | |
2530 | gdb_gregset_t gregs; | |
2531 | gdb_fpregset_t fpregs; | |
2532 | #ifdef FILL_FPXREGSET | |
2533 | gdb_fpxregset_t fpxregs; | |
2534 | #endif | |
2535 | unsigned long lwp = ptid_get_lwp (ptid); | |
2536 | ||
2537 | fill_gregset (&gregs, -1); | |
2538 | note_data = (char *) elfcore_write_prstatus (obfd, | |
2539 | note_data, | |
2540 | note_size, | |
2541 | lwp, | |
2542 | stop_signal, &gregs); | |
2543 | ||
2544 | fill_fpregset (&fpregs, -1); | |
2545 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
2546 | note_data, | |
2547 | note_size, | |
2548 | &fpregs, sizeof (fpregs)); | |
2549 | #ifdef FILL_FPXREGSET | |
2550 | fill_fpxregset (&fpxregs, -1); | |
2551 | note_data = (char *) elfcore_write_prxfpreg (obfd, | |
2552 | note_data, | |
2553 | note_size, | |
2554 | &fpxregs, sizeof (fpxregs)); | |
2555 | #endif | |
2556 | return note_data; | |
2557 | } | |
2558 | ||
2559 | struct linux_nat_corefile_thread_data | |
2560 | { | |
2561 | bfd *obfd; | |
2562 | char *note_data; | |
2563 | int *note_size; | |
2564 | int num_notes; | |
2565 | }; | |
2566 | ||
2567 | /* Called by gdbthread.c once per thread. Records the thread's | |
2568 | register state for the corefile note section. */ | |
2569 | ||
2570 | static int | |
2571 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
2572 | { | |
2573 | struct linux_nat_corefile_thread_data *args = data; | |
2574 | ptid_t saved_ptid = inferior_ptid; | |
2575 | ||
2576 | inferior_ptid = ti->ptid; | |
2577 | registers_changed (); | |
2578 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2579 | fill_gregset should do it automatically. */ | |
2580 | args->note_data = linux_nat_do_thread_registers (args->obfd, | |
2581 | ti->ptid, | |
2582 | args->note_data, | |
2583 | args->note_size); | |
2584 | args->num_notes++; | |
2585 | inferior_ptid = saved_ptid; | |
2586 | registers_changed (); | |
2587 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2588 | fill_gregset should do it automatically. */ | |
2589 | return 0; | |
2590 | } | |
2591 | ||
2592 | /* Records the register state for the corefile note section. */ | |
2593 | ||
2594 | static char * | |
2595 | linux_nat_do_registers (bfd *obfd, ptid_t ptid, | |
2596 | char *note_data, int *note_size) | |
2597 | { | |
2598 | registers_changed (); | |
2599 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2600 | fill_gregset should do it automatically. */ | |
2601 | return linux_nat_do_thread_registers (obfd, | |
2602 | ptid_build (ptid_get_pid (inferior_ptid), | |
2603 | ptid_get_pid (inferior_ptid), | |
2604 | 0), | |
2605 | note_data, note_size); | |
2606 | return note_data; | |
2607 | } | |
2608 | ||
2609 | /* Fills the "to_make_corefile_note" target vector. Builds the note | |
2610 | section for a corefile, and returns it in a malloc buffer. */ | |
2611 | ||
2612 | static char * | |
2613 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
2614 | { | |
2615 | struct linux_nat_corefile_thread_data thread_args; | |
2616 | struct cleanup *old_chain; | |
2617 | char fname[16] = { '\0' }; | |
2618 | char psargs[80] = { '\0' }; | |
2619 | char *note_data = NULL; | |
2620 | ptid_t current_ptid = inferior_ptid; | |
2621 | char *auxv; | |
2622 | int auxv_len; | |
2623 | ||
2624 | if (get_exec_file (0)) | |
2625 | { | |
2626 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
2627 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
2628 | if (get_inferior_args ()) | |
2629 | { | |
2630 | strncat (psargs, " ", sizeof (psargs) - strlen (psargs)); | |
2631 | strncat (psargs, get_inferior_args (), | |
2632 | sizeof (psargs) - strlen (psargs)); | |
2633 | } | |
2634 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
2635 | note_data, | |
2636 | note_size, fname, psargs); | |
2637 | } | |
2638 | ||
2639 | /* Dump information for threads. */ | |
2640 | thread_args.obfd = obfd; | |
2641 | thread_args.note_data = note_data; | |
2642 | thread_args.note_size = note_size; | |
2643 | thread_args.num_notes = 0; | |
2644 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); | |
2645 | if (thread_args.num_notes == 0) | |
2646 | { | |
2647 | /* iterate_over_threads didn't come up with any threads; just | |
2648 | use inferior_ptid. */ | |
2649 | note_data = linux_nat_do_registers (obfd, inferior_ptid, | |
2650 | note_data, note_size); | |
2651 | } | |
2652 | else | |
2653 | { | |
2654 | note_data = thread_args.note_data; | |
2655 | } | |
2656 | ||
2657 | auxv_len = target_auxv_read (¤t_target, &auxv); | |
2658 | if (auxv_len > 0) | |
2659 | { | |
2660 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
2661 | "CORE", NT_AUXV, auxv, auxv_len); | |
2662 | xfree (auxv); | |
2663 | } | |
2664 | ||
2665 | make_cleanup (xfree, note_data); | |
2666 | return note_data; | |
2667 | } | |
2668 | ||
2669 | /* Implement the "info proc" command. */ | |
2670 | ||
2671 | static void | |
2672 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
2673 | { | |
2674 | long long pid = PIDGET (inferior_ptid); | |
2675 | FILE *procfile; | |
2676 | char **argv = NULL; | |
2677 | char buffer[MAXPATHLEN]; | |
2678 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
2679 | int cmdline_f = 1; | |
2680 | int cwd_f = 1; | |
2681 | int exe_f = 1; | |
2682 | int mappings_f = 0; | |
2683 | int environ_f = 0; | |
2684 | int status_f = 0; | |
2685 | int stat_f = 0; | |
2686 | int all = 0; | |
2687 | struct stat dummy; | |
2688 | ||
2689 | if (args) | |
2690 | { | |
2691 | /* Break up 'args' into an argv array. */ | |
2692 | if ((argv = buildargv (args)) == NULL) | |
2693 | nomem (0); | |
2694 | else | |
2695 | make_cleanup_freeargv (argv); | |
2696 | } | |
2697 | while (argv != NULL && *argv != NULL) | |
2698 | { | |
2699 | if (isdigit (argv[0][0])) | |
2700 | { | |
2701 | pid = strtoul (argv[0], NULL, 10); | |
2702 | } | |
2703 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
2704 | { | |
2705 | mappings_f = 1; | |
2706 | } | |
2707 | else if (strcmp (argv[0], "status") == 0) | |
2708 | { | |
2709 | status_f = 1; | |
2710 | } | |
2711 | else if (strcmp (argv[0], "stat") == 0) | |
2712 | { | |
2713 | stat_f = 1; | |
2714 | } | |
2715 | else if (strcmp (argv[0], "cmd") == 0) | |
2716 | { | |
2717 | cmdline_f = 1; | |
2718 | } | |
2719 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
2720 | { | |
2721 | exe_f = 1; | |
2722 | } | |
2723 | else if (strcmp (argv[0], "cwd") == 0) | |
2724 | { | |
2725 | cwd_f = 1; | |
2726 | } | |
2727 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
2728 | { | |
2729 | all = 1; | |
2730 | } | |
2731 | else | |
2732 | { | |
2733 | /* [...] (future options here) */ | |
2734 | } | |
2735 | argv++; | |
2736 | } | |
2737 | if (pid == 0) | |
8a3fe4f8 | 2738 | error (_("No current process: you must name one.")); |
dba24537 AC |
2739 | |
2740 | sprintf (fname1, "/proc/%lld", pid); | |
2741 | if (stat (fname1, &dummy) != 0) | |
8a3fe4f8 | 2742 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 2743 | |
a3f17187 | 2744 | printf_filtered (_("process %lld\n"), pid); |
dba24537 AC |
2745 | if (cmdline_f || all) |
2746 | { | |
2747 | sprintf (fname1, "/proc/%lld/cmdline", pid); | |
2748 | if ((procfile = fopen (fname1, "r")) > 0) | |
2749 | { | |
2750 | fgets (buffer, sizeof (buffer), procfile); | |
2751 | printf_filtered ("cmdline = '%s'\n", buffer); | |
2752 | fclose (procfile); | |
2753 | } | |
2754 | else | |
8a3fe4f8 | 2755 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2756 | } |
2757 | if (cwd_f || all) | |
2758 | { | |
2759 | sprintf (fname1, "/proc/%lld/cwd", pid); | |
2760 | memset (fname2, 0, sizeof (fname2)); | |
2761 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2762 | printf_filtered ("cwd = '%s'\n", fname2); | |
2763 | else | |
8a3fe4f8 | 2764 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2765 | } |
2766 | if (exe_f || all) | |
2767 | { | |
2768 | sprintf (fname1, "/proc/%lld/exe", pid); | |
2769 | memset (fname2, 0, sizeof (fname2)); | |
2770 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2771 | printf_filtered ("exe = '%s'\n", fname2); | |
2772 | else | |
8a3fe4f8 | 2773 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2774 | } |
2775 | if (mappings_f || all) | |
2776 | { | |
2777 | sprintf (fname1, "/proc/%lld/maps", pid); | |
2778 | if ((procfile = fopen (fname1, "r")) > 0) | |
2779 | { | |
2780 | long long addr, endaddr, size, offset, inode; | |
2781 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2782 | ||
a3f17187 | 2783 | printf_filtered (_("Mapped address spaces:\n\n")); |
dba24537 AC |
2784 | if (TARGET_ADDR_BIT == 32) |
2785 | { | |
2786 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
2787 | "Start Addr", | |
2788 | " End Addr", | |
2789 | " Size", " Offset", "objfile"); | |
2790 | } | |
2791 | else | |
2792 | { | |
2793 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
2794 | "Start Addr", | |
2795 | " End Addr", | |
2796 | " Size", " Offset", "objfile"); | |
2797 | } | |
2798 | ||
2799 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
2800 | &offset, &device[0], &inode, &filename[0])) | |
2801 | { | |
2802 | size = endaddr - addr; | |
2803 | ||
2804 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
2805 | calls here (and possibly above) should be abstracted | |
2806 | out into their own functions? Andrew suggests using | |
2807 | a generic local_address_string instead to print out | |
2808 | the addresses; that makes sense to me, too. */ | |
2809 | ||
2810 | if (TARGET_ADDR_BIT == 32) | |
2811 | { | |
2812 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
2813 | (unsigned long) addr, /* FIXME: pr_addr */ | |
2814 | (unsigned long) endaddr, | |
2815 | (int) size, | |
2816 | (unsigned int) offset, | |
2817 | filename[0] ? filename : ""); | |
2818 | } | |
2819 | else | |
2820 | { | |
2821 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
2822 | (unsigned long) addr, /* FIXME: pr_addr */ | |
2823 | (unsigned long) endaddr, | |
2824 | (int) size, | |
2825 | (unsigned int) offset, | |
2826 | filename[0] ? filename : ""); | |
2827 | } | |
2828 | } | |
2829 | ||
2830 | fclose (procfile); | |
2831 | } | |
2832 | else | |
8a3fe4f8 | 2833 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2834 | } |
2835 | if (status_f || all) | |
2836 | { | |
2837 | sprintf (fname1, "/proc/%lld/status", pid); | |
2838 | if ((procfile = fopen (fname1, "r")) > 0) | |
2839 | { | |
2840 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
2841 | puts_filtered (buffer); | |
2842 | fclose (procfile); | |
2843 | } | |
2844 | else | |
8a3fe4f8 | 2845 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2846 | } |
2847 | if (stat_f || all) | |
2848 | { | |
2849 | sprintf (fname1, "/proc/%lld/stat", pid); | |
2850 | if ((procfile = fopen (fname1, "r")) > 0) | |
2851 | { | |
2852 | int itmp; | |
2853 | char ctmp; | |
2854 | ||
2855 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 2856 | printf_filtered (_("Process: %d\n"), itmp); |
dba24537 | 2857 | if (fscanf (procfile, "%s ", &buffer[0]) > 0) |
a3f17187 | 2858 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 2859 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 2860 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 2861 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2862 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 2863 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2864 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 2865 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2866 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 2867 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2868 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 2869 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2870 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
dba24537 | 2871 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 2872 | printf_filtered (_("Flags: 0x%x\n"), itmp); |
dba24537 | 2873 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 2874 | printf_filtered (_("Minor faults (no memory page): %u\n"), |
dba24537 AC |
2875 | (unsigned int) itmp); |
2876 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2877 | printf_filtered (_("Minor faults, children: %u\n"), |
dba24537 AC |
2878 | (unsigned int) itmp); |
2879 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2880 | printf_filtered (_("Major faults (memory page faults): %u\n"), |
dba24537 AC |
2881 | (unsigned int) itmp); |
2882 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2883 | printf_filtered (_("Major faults, children: %u\n"), |
dba24537 AC |
2884 | (unsigned int) itmp); |
2885 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
2886 | printf_filtered ("utime: %d\n", itmp); | |
2887 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
2888 | printf_filtered ("stime: %d\n", itmp); | |
2889 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
2890 | printf_filtered ("utime, children: %d\n", itmp); | |
2891 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
2892 | printf_filtered ("stime, children: %d\n", itmp); | |
2893 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 2894 | printf_filtered (_("jiffies remaining in current time slice: %d\n"), |
dba24537 AC |
2895 | itmp); |
2896 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
2897 | printf_filtered ("'nice' value: %d\n", itmp); | |
2898 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2899 | printf_filtered (_("jiffies until next timeout: %u\n"), |
dba24537 AC |
2900 | (unsigned int) itmp); |
2901 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
2902 | printf_filtered ("jiffies until next SIGALRM: %u\n", | |
2903 | (unsigned int) itmp); | |
2904 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 2905 | printf_filtered (_("start time (jiffies since system boot): %d\n"), |
dba24537 AC |
2906 | itmp); |
2907 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2908 | printf_filtered (_("Virtual memory size: %u\n"), |
dba24537 AC |
2909 | (unsigned int) itmp); |
2910 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2911 | printf_filtered (_("Resident set size: %u\n"), (unsigned int) itmp); |
dba24537 AC |
2912 | if (fscanf (procfile, "%u ", &itmp) > 0) |
2913 | printf_filtered ("rlim: %u\n", (unsigned int) itmp); | |
2914 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 2915 | printf_filtered (_("Start of text: 0x%x\n"), itmp); |
dba24537 | 2916 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 2917 | printf_filtered (_("End of text: 0x%x\n"), itmp); |
dba24537 | 2918 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 2919 | printf_filtered (_("Start of stack: 0x%x\n"), itmp); |
dba24537 AC |
2920 | #if 0 /* Don't know how architecture-dependent the rest is... |
2921 | Anyway the signal bitmap info is available from "status". */ | |
2922 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ | |
a3f17187 | 2923 | printf_filtered (_("Kernel stack pointer: 0x%x\n"), itmp); |
dba24537 | 2924 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 2925 | printf_filtered (_("Kernel instr pointer: 0x%x\n"), itmp); |
dba24537 | 2926 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2927 | printf_filtered (_("Pending signals bitmap: 0x%x\n"), itmp); |
dba24537 | 2928 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2929 | printf_filtered (_("Blocked signals bitmap: 0x%x\n"), itmp); |
dba24537 | 2930 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2931 | printf_filtered (_("Ignored signals bitmap: 0x%x\n"), itmp); |
dba24537 | 2932 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2933 | printf_filtered (_("Catched signals bitmap: 0x%x\n"), itmp); |
dba24537 | 2934 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 2935 | printf_filtered (_("wchan (system call): 0x%x\n"), itmp); |
dba24537 AC |
2936 | #endif |
2937 | fclose (procfile); | |
2938 | } | |
2939 | else | |
8a3fe4f8 | 2940 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2941 | } |
2942 | } | |
2943 | ||
2944 | int | |
2945 | linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len, int write, | |
2946 | struct mem_attrib *attrib, struct target_ops *target) | |
2947 | { | |
2948 | int fd, ret; | |
2949 | char filename[64]; | |
2950 | ||
2951 | if (write) | |
2952 | return 0; | |
2953 | ||
2954 | /* Don't bother for one word. */ | |
2955 | if (len < 3 * sizeof (long)) | |
2956 | return 0; | |
2957 | ||
2958 | /* We could keep this file open and cache it - possibly one per | |
2959 | thread. That requires some juggling, but is even faster. */ | |
2960 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
2961 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
2962 | if (fd == -1) | |
2963 | return 0; | |
2964 | ||
2965 | /* If pread64 is available, use it. It's faster if the kernel | |
2966 | supports it (only one syscall), and it's 64-bit safe even on | |
2967 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2968 | application). */ | |
2969 | #ifdef HAVE_PREAD64 | |
2970 | if (pread64 (fd, myaddr, len, addr) != len) | |
2971 | #else | |
2972 | if (lseek (fd, addr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) | |
2973 | #endif | |
2974 | ret = 0; | |
2975 | else | |
2976 | ret = len; | |
2977 | ||
2978 | close (fd); | |
2979 | return ret; | |
2980 | } | |
2981 | ||
2982 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
2983 | ||
2984 | static void | |
2985 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
2986 | { | |
2987 | int len = strlen (line) - 1; | |
2988 | const char *p; | |
2989 | int signum; | |
2990 | ||
2991 | if (line[len] != '\n') | |
8a3fe4f8 | 2992 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
2993 | |
2994 | p = line; | |
2995 | signum = len * 4; | |
2996 | while (len-- > 0) | |
2997 | { | |
2998 | int digit; | |
2999 | ||
3000 | if (*p >= '0' && *p <= '9') | |
3001 | digit = *p - '0'; | |
3002 | else if (*p >= 'a' && *p <= 'f') | |
3003 | digit = *p - 'a' + 10; | |
3004 | else | |
8a3fe4f8 | 3005 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3006 | |
3007 | signum -= 4; | |
3008 | ||
3009 | if (digit & 1) | |
3010 | sigaddset (sigs, signum + 1); | |
3011 | if (digit & 2) | |
3012 | sigaddset (sigs, signum + 2); | |
3013 | if (digit & 4) | |
3014 | sigaddset (sigs, signum + 3); | |
3015 | if (digit & 8) | |
3016 | sigaddset (sigs, signum + 4); | |
3017 | ||
3018 | p++; | |
3019 | } | |
3020 | } | |
3021 | ||
3022 | /* Find process PID's pending signals from /proc/pid/status and set | |
3023 | SIGS to match. */ | |
3024 | ||
3025 | void | |
3026 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
3027 | { | |
3028 | FILE *procfile; | |
3029 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
3030 | int signum; | |
3031 | ||
3032 | sigemptyset (pending); | |
3033 | sigemptyset (blocked); | |
3034 | sigemptyset (ignored); | |
3035 | sprintf (fname, "/proc/%d/status", pid); | |
3036 | procfile = fopen (fname, "r"); | |
3037 | if (procfile == NULL) | |
8a3fe4f8 | 3038 | error (_("Could not open %s"), fname); |
dba24537 AC |
3039 | |
3040 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
3041 | { | |
3042 | /* Normal queued signals are on the SigPnd line in the status | |
3043 | file. However, 2.6 kernels also have a "shared" pending | |
3044 | queue for delivering signals to a thread group, so check for | |
3045 | a ShdPnd line also. | |
3046 | ||
3047 | Unfortunately some Red Hat kernels include the shared pending | |
3048 | queue but not the ShdPnd status field. */ | |
3049 | ||
3050 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
3051 | add_line_to_sigset (buffer + 8, pending); | |
3052 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
3053 | add_line_to_sigset (buffer + 8, pending); | |
3054 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
3055 | add_line_to_sigset (buffer + 8, blocked); | |
3056 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
3057 | add_line_to_sigset (buffer + 8, ignored); | |
3058 | } | |
3059 | ||
3060 | fclose (procfile); | |
3061 | } | |
3062 | ||
d6b0e80f AC |
3063 | void |
3064 | _initialize_linux_nat (void) | |
3065 | { | |
3066 | struct sigaction action; | |
d6b0e80f | 3067 | extern void thread_db_init (struct target_ops *); |
dba24537 | 3068 | |
146c42e3 JB |
3069 | deprecated_child_ops.to_find_memory_regions = linux_nat_find_memory_regions; |
3070 | deprecated_child_ops.to_make_corefile_notes = linux_nat_make_corefile_notes; | |
dba24537 | 3071 | |
1bedd215 AC |
3072 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
3073 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
3074 | Specify any process id, or use the program being debugged by default.\n\ |
3075 | Specify any of the following keywords for detailed info:\n\ | |
3076 | mappings -- list of mapped memory regions.\n\ | |
3077 | stat -- list a bunch of random process info.\n\ | |
3078 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 3079 | all -- list all available /proc info.")); |
d6b0e80f AC |
3080 | |
3081 | init_linux_nat_ops (); | |
3082 | add_target (&linux_nat_ops); | |
3083 | thread_db_init (&linux_nat_ops); | |
3084 | ||
3085 | /* Save the original signal mask. */ | |
3086 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); | |
3087 | ||
3088 | action.sa_handler = sigchld_handler; | |
3089 | sigemptyset (&action.sa_mask); | |
3090 | action.sa_flags = 0; | |
3091 | sigaction (SIGCHLD, &action, NULL); | |
3092 | ||
3093 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
3094 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
3095 | sigdelset (&suspend_mask, SIGCHLD); | |
3096 | ||
3097 | sigemptyset (&blocked_mask); | |
3098 | ||
85c07804 AC |
3099 | add_setshow_zinteger_cmd ("lin-lwp", no_class, &debug_linux_nat, _("\ |
3100 | Set debugging of GNU/Linux lwp module."), _("\ | |
3101 | Show debugging of GNU/Linux lwp module."), _("\ | |
3102 | Enables printf debugging output."), | |
3103 | NULL, | |
920d2a44 | 3104 | show_debug_linux_nat, |
85c07804 | 3105 | &setdebuglist, &showdebuglist); |
d6b0e80f AC |
3106 | } |
3107 | \f | |
3108 | ||
3109 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
3110 | the GNU/Linux Threads library and therefore doesn't really belong | |
3111 | here. */ | |
3112 | ||
3113 | /* Read variable NAME in the target and return its value if found. | |
3114 | Otherwise return zero. It is assumed that the type of the variable | |
3115 | is `int'. */ | |
3116 | ||
3117 | static int | |
3118 | get_signo (const char *name) | |
3119 | { | |
3120 | struct minimal_symbol *ms; | |
3121 | int signo; | |
3122 | ||
3123 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
3124 | if (ms == NULL) | |
3125 | return 0; | |
3126 | ||
3127 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo, | |
3128 | sizeof (signo)) != 0) | |
3129 | return 0; | |
3130 | ||
3131 | return signo; | |
3132 | } | |
3133 | ||
3134 | /* Return the set of signals used by the threads library in *SET. */ | |
3135 | ||
3136 | void | |
3137 | lin_thread_get_thread_signals (sigset_t *set) | |
3138 | { | |
3139 | struct sigaction action; | |
3140 | int restart, cancel; | |
3141 | ||
3142 | sigemptyset (set); | |
3143 | ||
3144 | restart = get_signo ("__pthread_sig_restart"); | |
3145 | if (restart == 0) | |
3146 | return; | |
3147 | ||
3148 | cancel = get_signo ("__pthread_sig_cancel"); | |
3149 | if (cancel == 0) | |
3150 | return; | |
3151 | ||
3152 | sigaddset (set, restart); | |
3153 | sigaddset (set, cancel); | |
3154 | ||
3155 | /* The GNU/Linux Threads library makes terminating threads send a | |
3156 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
3157 | those (to prevent them from terminating GDB itself, which is | |
3158 | likely to be their default action) and treat them the same way as | |
3159 | SIGCHLD. */ | |
3160 | ||
3161 | action.sa_handler = sigchld_handler; | |
3162 | sigemptyset (&action.sa_mask); | |
3163 | action.sa_flags = 0; | |
3164 | sigaction (cancel, &action, NULL); | |
3165 | ||
3166 | /* We block the "cancel" signal throughout this code ... */ | |
3167 | sigaddset (&blocked_mask, cancel); | |
3168 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
3169 | ||
3170 | /* ... except during a sigsuspend. */ | |
3171 | sigdelset (&suspend_mask, cancel); | |
3172 | } |