Commit | Line | Data |
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8605d56e | 1 | /* Multi-threaded debugging support for GNU/Linux (LWP layer). |
4e052eda | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
fb0e1ba7 MK |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | ||
23 | #include "gdb_assert.h" | |
24 | #include <errno.h> | |
25 | #include <signal.h> | |
26 | #include <sys/ptrace.h> | |
27 | #include "gdb_wait.h" | |
28 | ||
29 | #include "gdbthread.h" | |
30 | #include "inferior.h" | |
31 | #include "target.h" | |
4e052eda | 32 | #include "regcache.h" |
7ca673cd | 33 | #include "gdbcmd.h" |
fb0e1ba7 | 34 | |
7ca673cd | 35 | static int debug_lin_lwp; |
fb0e1ba7 | 36 | extern const char *strsignal (int sig); |
fb0e1ba7 | 37 | |
8605d56e AC |
38 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
39 | are processes sharing the same VM space. A multi-threaded process | |
40 | is basically a group of such processes. However, such a grouping | |
41 | is almost entirely a user-space issue; the kernel doesn't enforce | |
42 | such a grouping at all (this might change in the future). In | |
43 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
44 | Threads library) to provide such a grouping. | |
fb0e1ba7 MK |
45 | |
46 | It is perfectly well possible to write a multi-threaded application | |
47 | without the assistance of a threads library, by using the clone | |
48 | system call directly. This module should be able to give some | |
49 | rudimentary support for debugging such applications if developers | |
50 | specify the CLONE_PTRACE flag in the clone system call, and are | |
8605d56e | 51 | using the Linux kernel 2.4 or above. |
fb0e1ba7 | 52 | |
8605d56e AC |
53 | Note that there are some peculiarities in GNU/Linux that affect |
54 | this code: | |
fb0e1ba7 MK |
55 | |
56 | - In general one should specify the __WCLONE flag to waitpid in | |
3f07c44b MK |
57 | order to make it report events for any of the cloned processes |
58 | (and leave it out for the initial process). However, if a cloned | |
59 | process has exited the exit status is only reported if the | |
8605d56e AC |
60 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but |
61 | we cannot use it since GDB must work on older systems too. | |
fb0e1ba7 MK |
62 | |
63 | - When a traced, cloned process exits and is waited for by the | |
4c8de859 | 64 | debugger, the kernel reassigns it to the original parent and |
8605d56e AC |
65 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads |
66 | library doesn't notice this, which leads to the "zombie problem": | |
67 | When debugged a multi-threaded process that spawns a lot of | |
68 | threads will run out of processes, even if the threads exit, | |
69 | because the "zombies" stay around. */ | |
fb0e1ba7 MK |
70 | |
71 | /* Structure describing a LWP. */ | |
72 | struct lwp_info | |
73 | { | |
74 | /* The process id of the LWP. This is a combination of the LWP id | |
75 | and overall process id. */ | |
39f77062 | 76 | ptid_t ptid; |
fb0e1ba7 | 77 | |
cacab7c4 MK |
78 | /* Non-zero if this LWP is cloned. In this context "cloned" means |
79 | that the LWP is reporting to its parent using a signal other than | |
80 | SIGCHLD. */ | |
81 | int cloned; | |
82 | ||
fb0e1ba7 MK |
83 | /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report |
84 | it back yet). */ | |
85 | int signalled; | |
86 | ||
87 | /* Non-zero if this LWP is stopped. */ | |
88 | int stopped; | |
89 | ||
fce0e6e1 MK |
90 | /* Non-zero if this LWP will be/has been resumed. Note that an LWP |
91 | can be marked both as stopped and resumed at the same time. This | |
92 | happens if we try to resume an LWP that has a wait status | |
93 | pending. We shouldn't let the LWP run until that wait status has | |
94 | been processed, but we should not report that wait status if GDB | |
95 | didn't try to let the LWP run. */ | |
96 | int resumed; | |
97 | ||
fb0e1ba7 MK |
98 | /* If non-zero, a pending wait status. */ |
99 | int status; | |
100 | ||
101 | /* Non-zero if we were stepping this LWP. */ | |
102 | int step; | |
103 | ||
104 | /* Next LWP in list. */ | |
105 | struct lwp_info *next; | |
106 | }; | |
107 | ||
108 | /* List of known LWPs. */ | |
109 | static struct lwp_info *lwp_list; | |
110 | ||
111 | /* Number of LWPs in the list. */ | |
112 | static int num_lwps; | |
113 | ||
114 | /* Non-zero if we're running in "threaded" mode. */ | |
115 | static int threaded; | |
116 | \f | |
117 | ||
ca6724c1 KB |
118 | #define GET_LWP(ptid) ptid_get_lwp (ptid) |
119 | #define GET_PID(ptid) ptid_get_pid (ptid) | |
120 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) | |
121 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) | |
fb0e1ba7 | 122 | |
fb0e1ba7 MK |
123 | /* If the last reported event was a SIGTRAP, this variable is set to |
124 | the process id of the LWP/thread that got it. */ | |
39f77062 | 125 | ptid_t trap_ptid; |
fb0e1ba7 MK |
126 | \f |
127 | ||
128 | /* This module's target-specific operations. */ | |
129 | static struct target_ops lin_lwp_ops; | |
130 | ||
131 | /* The standard child operations. */ | |
132 | extern struct target_ops child_ops; | |
133 | ||
3f07c44b MK |
134 | /* Since we cannot wait (in lin_lwp_wait) for the initial process and |
135 | any cloned processes with a single call to waitpid, we have to use | |
4c8de859 | 136 | the WNOHANG flag and call waitpid in a loop. To optimize |
3f07c44b MK |
137 | things a bit we use `sigsuspend' to wake us up when a process has |
138 | something to report (it will send us a SIGCHLD if it has). To make | |
139 | this work we have to juggle with the signal mask. We save the | |
4c8de859 | 140 | original signal mask such that we can restore it before creating a |
3f07c44b MK |
141 | new process in order to avoid blocking certain signals in the |
142 | inferior. We then block SIGCHLD during the waitpid/sigsuspend | |
143 | loop. */ | |
144 | ||
4c8de859 | 145 | /* Original signal mask. */ |
3f07c44b MK |
146 | static sigset_t normal_mask; |
147 | ||
fb0e1ba7 MK |
148 | /* Signal mask for use with sigsuspend in lin_lwp_wait, initialized in |
149 | _initialize_lin_lwp. */ | |
150 | static sigset_t suspend_mask; | |
3f07c44b MK |
151 | |
152 | /* Signals to block to make that sigsuspend work. */ | |
153 | static sigset_t blocked_mask; | |
fb0e1ba7 MK |
154 | \f |
155 | ||
156 | /* Prototypes for local functions. */ | |
c194fbe1 | 157 | static int stop_wait_callback (struct lwp_info *lp, void *data); |
fb0e1ba7 | 158 | \f |
58eeadba MK |
159 | /* Convert wait status STATUS to a string. Used for printing debug |
160 | messages only. */ | |
fb0e1ba7 | 161 | |
58eeadba MK |
162 | static char * |
163 | status_to_str (int status) | |
164 | { | |
165 | static char buf[64]; | |
166 | ||
167 | if (WIFSTOPPED (status)) | |
168 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
169 | strsignal (WSTOPSIG (status))); | |
170 | else if (WIFSIGNALED (status)) | |
171 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
172 | strsignal (WSTOPSIG (status))); | |
173 | else | |
174 | snprintf (buf, sizeof (buf), "%d (exited)", | |
175 | WEXITSTATUS (status)); | |
176 | ||
177 | return buf; | |
178 | } | |
179 | \f | |
c194fbe1 MK |
180 | /* Initialize the list of LWPs. Note that this module, contrary to |
181 | what GDB's generic threads layer does for its thread list, | |
182 | re-initializes the LWP lists whenever we mourn or detach (which | |
183 | doesn't involve mourning) the inferior. */ | |
fb0e1ba7 MK |
184 | |
185 | static void | |
186 | init_lwp_list (void) | |
187 | { | |
188 | struct lwp_info *lp, *lpnext; | |
189 | ||
190 | for (lp = lwp_list; lp; lp = lpnext) | |
191 | { | |
192 | lpnext = lp->next; | |
b8c9b27d | 193 | xfree (lp); |
fb0e1ba7 MK |
194 | } |
195 | ||
196 | lwp_list = NULL; | |
197 | num_lwps = 0; | |
198 | threaded = 0; | |
199 | } | |
200 | ||
201 | /* Add the LWP specified by PID to the list. If this causes the | |
202 | number of LWPs to become larger than one, go into "threaded" mode. | |
203 | Return a pointer to the structure describing the new LWP. */ | |
204 | ||
205 | static struct lwp_info * | |
39f77062 | 206 | add_lwp (ptid_t ptid) |
fb0e1ba7 MK |
207 | { |
208 | struct lwp_info *lp; | |
209 | ||
39f77062 | 210 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 MK |
211 | |
212 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
213 | ||
214 | memset (lp, 0, sizeof (struct lwp_info)); | |
215 | ||
39f77062 | 216 | lp->ptid = ptid; |
fb0e1ba7 MK |
217 | |
218 | lp->next = lwp_list; | |
219 | lwp_list = lp; | |
220 | if (++num_lwps > 1) | |
221 | threaded = 1; | |
222 | ||
223 | return lp; | |
224 | } | |
225 | ||
226 | /* Remove the LWP specified by PID from the list. */ | |
227 | ||
228 | static void | |
39f77062 | 229 | delete_lwp (ptid_t ptid) |
fb0e1ba7 MK |
230 | { |
231 | struct lwp_info *lp, *lpprev; | |
232 | ||
233 | lpprev = NULL; | |
234 | ||
235 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
39f77062 | 236 | if (ptid_equal (lp->ptid, ptid)) |
fb0e1ba7 MK |
237 | break; |
238 | ||
239 | if (!lp) | |
240 | return; | |
241 | ||
242 | /* We don't go back to "non-threaded" mode if the number of threads | |
243 | becomes less than two. */ | |
244 | num_lwps--; | |
245 | ||
246 | if (lpprev) | |
247 | lpprev->next = lp->next; | |
248 | else | |
249 | lwp_list = lp->next; | |
250 | ||
b8c9b27d | 251 | xfree (lp); |
fb0e1ba7 MK |
252 | } |
253 | ||
254 | /* Return a pointer to the structure describing the LWP corresponding | |
255 | to PID. If no corresponding LWP could be found, return NULL. */ | |
256 | ||
257 | static struct lwp_info * | |
39f77062 | 258 | find_lwp_pid (ptid_t ptid) |
fb0e1ba7 MK |
259 | { |
260 | struct lwp_info *lp; | |
39f77062 | 261 | int lwp; |
fb0e1ba7 | 262 | |
39f77062 KB |
263 | if (is_lwp (ptid)) |
264 | lwp = GET_LWP (ptid); | |
265 | else | |
266 | lwp = GET_PID (ptid); | |
fb0e1ba7 MK |
267 | |
268 | for (lp = lwp_list; lp; lp = lp->next) | |
39f77062 | 269 | if (lwp == GET_LWP (lp->ptid)) |
fb0e1ba7 MK |
270 | return lp; |
271 | ||
272 | return NULL; | |
273 | } | |
274 | ||
275 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
276 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
277 | pointer to the structure describing that LWP immediately. | |
278 | Otherwise return NULL. */ | |
279 | ||
280 | struct lwp_info * | |
281 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
282 | { | |
fce0e6e1 | 283 | struct lwp_info *lp, *lpnext; |
fb0e1ba7 | 284 | |
fce0e6e1 MK |
285 | for (lp = lwp_list; lp; lp = lpnext) |
286 | { | |
287 | lpnext = lp->next; | |
288 | if ((*callback) (lp, data)) | |
289 | return lp; | |
290 | } | |
fb0e1ba7 MK |
291 | |
292 | return NULL; | |
293 | } | |
294 | \f | |
295 | ||
8605d56e | 296 | /* Implementation of the PREPARE_TO_PROCEED hook for the GNU/Linux LWP |
e02bc4cc DS |
297 | layer. |
298 | ||
299 | Note that this implementation is potentially redundant now that | |
8849f47d JL |
300 | default_prepare_to_proceed() has been added. |
301 | ||
302 | FIXME This may not support switching threads after Ctrl-C | |
303 | correctly. The default implementation does support this. */ | |
fb0e1ba7 MK |
304 | |
305 | int | |
306 | lin_lwp_prepare_to_proceed (void) | |
307 | { | |
39f77062 KB |
308 | if (! ptid_equal (trap_ptid, null_ptid) |
309 | && ! ptid_equal (inferior_ptid, trap_ptid)) | |
fb0e1ba7 MK |
310 | { |
311 | /* Switched over from TRAP_PID. */ | |
312 | CORE_ADDR stop_pc = read_pc (); | |
313 | CORE_ADDR trap_pc; | |
314 | ||
315 | /* Avoid switching where it wouldn't do any good, i.e. if both | |
316 | threads are at the same breakpoint. */ | |
39f77062 | 317 | trap_pc = read_pc_pid (trap_ptid); |
fb0e1ba7 MK |
318 | if (trap_pc != stop_pc && breakpoint_here_p (trap_pc)) |
319 | { | |
320 | /* User hasn't deleted the breakpoint. Return non-zero, and | |
321 | switch back to TRAP_PID. */ | |
39f77062 | 322 | inferior_ptid = trap_ptid; |
fb0e1ba7 MK |
323 | |
324 | /* FIXME: Is this stuff really necessary? */ | |
325 | flush_cached_frames (); | |
326 | registers_changed (); | |
327 | ||
328 | return 1; | |
329 | } | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | \f | |
335 | ||
336 | #if 0 | |
337 | static void | |
338 | lin_lwp_open (char *args, int from_tty) | |
339 | { | |
340 | push_target (&lin_lwp_ops); | |
341 | } | |
342 | #endif | |
343 | ||
344 | /* Attach to the LWP specified by PID. If VERBOSE is non-zero, print | |
345 | a message telling the user that a new LWP has been added to the | |
346 | process. */ | |
347 | ||
348 | void | |
39f77062 | 349 | lin_lwp_attach_lwp (ptid_t ptid, int verbose) |
fb0e1ba7 MK |
350 | { |
351 | struct lwp_info *lp; | |
352 | ||
39f77062 | 353 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 354 | |
da9c7185 KB |
355 | /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events |
356 | to interrupt either the ptrace() or waitpid() calls below. */ | |
357 | if (! sigismember (&blocked_mask, SIGCHLD)) | |
358 | { | |
359 | sigaddset (&blocked_mask, SIGCHLD); | |
360 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
361 | } | |
362 | ||
fb0e1ba7 | 363 | if (verbose) |
39f77062 | 364 | printf_filtered ("[New %s]\n", target_pid_to_str (ptid)); |
fb0e1ba7 | 365 | |
c194fbe1 MK |
366 | lp = find_lwp_pid (ptid); |
367 | if (lp == NULL) | |
368 | lp = add_lwp (ptid); | |
369 | ||
cacab7c4 MK |
370 | /* We assume that we're already attached to any LWP that has an |
371 | id equal to the overall process id. */ | |
372 | if (GET_LWP (ptid) != GET_PID (ptid)) | |
c4365b19 | 373 | { |
cacab7c4 MK |
374 | pid_t pid; |
375 | int status; | |
376 | ||
377 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
378 | error ("Can't attach %s: %s", target_pid_to_str (ptid), | |
dc672865 | 379 | safe_strerror (errno)); |
cacab7c4 MK |
380 | |
381 | pid = waitpid (GET_LWP (ptid), &status, 0); | |
382 | if (pid == -1 && errno == ECHILD) | |
383 | { | |
384 | /* Try again with __WCLONE to check cloned processes. */ | |
385 | pid = waitpid (GET_LWP (ptid), &status, __WCLONE); | |
386 | lp->cloned = 1; | |
387 | } | |
388 | ||
389 | gdb_assert (pid == GET_LWP (ptid) | |
390 | && WIFSTOPPED (status) && WSTOPSIG (status)); | |
391 | ||
392 | lp->stopped = 1; | |
c4365b19 | 393 | } |
da9c7185 KB |
394 | else |
395 | { | |
396 | /* We assume that the LWP representing the original process | |
397 | is already stopped. Mark it as stopped in the data structure | |
398 | that the lin-lwp layer uses to keep track of threads. Note | |
399 | that this won't have already been done since the main thread | |
400 | will have, we assume, been stopped by an attach from a | |
401 | different layer. */ | |
402 | lp->stopped = 1; | |
403 | } | |
fb0e1ba7 MK |
404 | } |
405 | ||
406 | static void | |
407 | lin_lwp_attach (char *args, int from_tty) | |
408 | { | |
c194fbe1 | 409 | struct lwp_info *lp; |
cacab7c4 MK |
410 | pid_t pid; |
411 | int status; | |
c194fbe1 | 412 | |
fb0e1ba7 MK |
413 | /* FIXME: We should probably accept a list of process id's, and |
414 | attach all of them. */ | |
c194fbe1 MK |
415 | child_ops.to_attach (args, from_tty); |
416 | ||
417 | /* Add the initial process as the first LWP to the list. */ | |
cacab7c4 | 418 | lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid))); |
c194fbe1 MK |
419 | |
420 | /* Make sure the initial process is stopped. The user-level threads | |
421 | layer might want to poke around in the inferior, and that won't | |
422 | work if things haven't stabilized yet. */ | |
cacab7c4 MK |
423 | pid = waitpid (GET_PID (inferior_ptid), &status, 0); |
424 | if (pid == -1 && errno == ECHILD) | |
425 | { | |
426 | warning ("%s is a cloned process", target_pid_to_str (inferior_ptid)); | |
427 | ||
428 | /* Try again with __WCLONE to check cloned processes. */ | |
429 | pid = waitpid (GET_PID (inferior_ptid), &status, __WCLONE); | |
430 | lp->cloned = 1; | |
431 | } | |
432 | ||
433 | gdb_assert (pid == GET_PID (inferior_ptid) | |
434 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP); | |
435 | ||
436 | lp->stopped = 1; | |
c194fbe1 MK |
437 | |
438 | /* Fake the SIGSTOP that core GDB expects. */ | |
439 | lp->status = W_STOPCODE (SIGSTOP); | |
fce0e6e1 | 440 | lp->resumed = 1; |
c194fbe1 MK |
441 | } |
442 | ||
443 | static int | |
444 | detach_callback (struct lwp_info *lp, void *data) | |
445 | { | |
446 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
447 | ||
448 | if (debug_lin_lwp && lp->status) | |
b08cfdb6 | 449 | fprintf_unfiltered (gdb_stdlog, "Pending %s for LWP %ld on detach.\n", |
c194fbe1 MK |
450 | strsignal (WSTOPSIG (lp->status)), GET_LWP (lp->ptid)); |
451 | ||
452 | while (lp->signalled && lp->stopped) | |
453 | { | |
454 | if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, | |
455 | WSTOPSIG (lp->status)) < 0) | |
456 | error ("Can't continue %s: %s", target_pid_to_str (lp->ptid), | |
dc672865 | 457 | safe_strerror (errno)); |
c194fbe1 MK |
458 | |
459 | lp->stopped = 0; | |
c4365b19 | 460 | lp->signalled = 0; |
c194fbe1 MK |
461 | lp->status = 0; |
462 | stop_wait_callback (lp, NULL); | |
463 | ||
464 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
465 | } | |
466 | ||
cacab7c4 MK |
467 | /* We don't actually detach from the LWP that has an id equal to the |
468 | overall process id just yet. */ | |
469 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
c194fbe1 MK |
470 | { |
471 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
472 | WSTOPSIG (lp->status)) < 0) | |
473 | error ("Can't detach %s: %s", target_pid_to_str (lp->ptid), | |
dc672865 | 474 | safe_strerror (errno)); |
c194fbe1 MK |
475 | |
476 | delete_lwp (lp->ptid); | |
477 | } | |
478 | ||
479 | return 0; | |
fb0e1ba7 MK |
480 | } |
481 | ||
482 | static void | |
483 | lin_lwp_detach (char *args, int from_tty) | |
484 | { | |
c194fbe1 MK |
485 | iterate_over_lwps (detach_callback, NULL); |
486 | ||
cacab7c4 | 487 | /* Only the initial process should be left right now. */ |
c194fbe1 MK |
488 | gdb_assert (num_lwps == 1); |
489 | ||
490 | trap_ptid = null_ptid; | |
491 | ||
492 | /* Destroy LWP info; it's no longer valid. */ | |
493 | init_lwp_list (); | |
494 | ||
495 | /* Restore the original signal mask. */ | |
496 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
497 | sigemptyset (&blocked_mask); | |
498 | ||
01263b57 | 499 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
c194fbe1 | 500 | child_ops.to_detach (args, from_tty); |
fb0e1ba7 MK |
501 | } |
502 | \f | |
503 | ||
504 | struct private_thread_info | |
505 | { | |
506 | int lwpid; | |
507 | }; | |
508 | ||
509 | /* Return non-zero if TP corresponds to the LWP specified by DATA | |
510 | (which is assumed to be a pointer to a `struct lwp_info'. */ | |
511 | ||
512 | static int | |
513 | find_lwp_callback (struct thread_info *tp, void *data) | |
514 | { | |
515 | struct lwp_info *lp = data; | |
516 | ||
39f77062 | 517 | if (tp->private->lwpid == GET_LWP (lp->ptid)) |
fb0e1ba7 MK |
518 | return 1; |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | /* Resume LP. */ | |
524 | ||
525 | static int | |
526 | resume_callback (struct lwp_info *lp, void *data) | |
527 | { | |
528 | if (lp->stopped && lp->status == 0) | |
529 | { | |
530 | struct thread_info *tp; | |
531 | ||
b1aeb4c5 | 532 | #if 0 |
fb0e1ba7 MK |
533 | /* FIXME: kettenis/2000-08-26: This should really be handled |
534 | properly by core GDB. */ | |
535 | ||
39f77062 | 536 | tp = find_thread_pid (lp->ptid); |
fb0e1ba7 MK |
537 | if (tp == NULL) |
538 | tp = iterate_over_threads (find_lwp_callback, lp); | |
539 | gdb_assert (tp); | |
540 | ||
541 | /* If we were previously stepping the thread, and now continue | |
542 | the thread we must invalidate the stepping range. However, | |
543 | if there is a step_resume breakpoint for this thread, we must | |
544 | preserve the stepping range to make it possible to continue | |
545 | stepping once we hit it. */ | |
546 | if (tp->step_range_end && tp->step_resume_breakpoint == NULL) | |
547 | { | |
548 | gdb_assert (lp->step); | |
549 | tp->step_range_start = tp->step_range_end = 0; | |
550 | } | |
551 | #endif | |
552 | ||
39f77062 | 553 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0); |
fb0e1ba7 MK |
554 | lp->stopped = 0; |
555 | lp->step = 0; | |
556 | } | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
fce0e6e1 MK |
561 | static int |
562 | resume_clear_callback (struct lwp_info *lp, void *data) | |
563 | { | |
564 | lp->resumed = 0; | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static int | |
569 | resume_set_callback (struct lwp_info *lp, void *data) | |
570 | { | |
571 | lp->resumed = 1; | |
572 | return 0; | |
573 | } | |
574 | ||
fb0e1ba7 | 575 | static void |
39f77062 | 576 | lin_lwp_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 MK |
577 | { |
578 | struct lwp_info *lp; | |
579 | int resume_all; | |
580 | ||
581 | /* Apparently the interpretation of PID is dependent on STEP: If | |
582 | STEP is non-zero, a specific PID means `step only this process | |
583 | id'. But if STEP is zero, then PID means `continue *all* | |
584 | processes, but give the signal only to this one'. */ | |
39f77062 | 585 | resume_all = (PIDGET (ptid) == -1) || !step; |
fb0e1ba7 | 586 | |
fce0e6e1 MK |
587 | if (resume_all) |
588 | iterate_over_lwps (resume_set_callback, NULL); | |
589 | else | |
590 | iterate_over_lwps (resume_clear_callback, NULL); | |
591 | ||
fb0e1ba7 | 592 | /* If PID is -1, it's the current inferior that should be |
c4365b19 | 593 | handled specially. */ |
39f77062 KB |
594 | if (PIDGET (ptid) == -1) |
595 | ptid = inferior_ptid; | |
fb0e1ba7 | 596 | |
39f77062 | 597 | lp = find_lwp_pid (ptid); |
fb0e1ba7 MK |
598 | if (lp) |
599 | { | |
39f77062 | 600 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); |
fb0e1ba7 | 601 | |
fb0e1ba7 MK |
602 | /* Remember if we're stepping. */ |
603 | lp->step = step; | |
604 | ||
fce0e6e1 MK |
605 | /* Mark this LWP as resumed. */ |
606 | lp->resumed = 1; | |
607 | ||
fb0e1ba7 MK |
608 | /* If we have a pending wait status for this thread, there is no |
609 | point in resuming the process. */ | |
610 | if (lp->status) | |
611 | { | |
612 | /* FIXME: What should we do if we are supposed to continue | |
613 | this thread with a signal? */ | |
614 | gdb_assert (signo == TARGET_SIGNAL_0); | |
615 | return; | |
616 | } | |
40564aca MK |
617 | |
618 | /* Mark LWP as not stopped to prevent it from being continued by | |
619 | resume_callback. */ | |
620 | lp->stopped = 0; | |
fb0e1ba7 MK |
621 | } |
622 | ||
623 | if (resume_all) | |
624 | iterate_over_lwps (resume_callback, NULL); | |
625 | ||
39f77062 | 626 | child_resume (ptid, step, signo); |
fb0e1ba7 MK |
627 | } |
628 | \f | |
629 | ||
630 | /* Send a SIGSTOP to LP. */ | |
631 | ||
632 | static int | |
633 | stop_callback (struct lwp_info *lp, void *data) | |
634 | { | |
635 | if (! lp->stopped && ! lp->signalled) | |
636 | { | |
637 | int ret; | |
638 | ||
39f77062 | 639 | ret = kill (GET_LWP (lp->ptid), SIGSTOP); |
fb0e1ba7 MK |
640 | gdb_assert (ret == 0); |
641 | ||
642 | lp->signalled = 1; | |
643 | gdb_assert (lp->status == 0); | |
644 | } | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
de4ca854 MK |
649 | /* Wait until LP is stopped. If DATA is non-null it is interpreted as |
650 | a pointer to a set of signals to be flushed immediately. */ | |
fb0e1ba7 MK |
651 | |
652 | static int | |
653 | stop_wait_callback (struct lwp_info *lp, void *data) | |
654 | { | |
de4ca854 MK |
655 | sigset_t *flush_mask = data; |
656 | ||
fb0e1ba7 MK |
657 | if (! lp->stopped && lp->signalled) |
658 | { | |
659 | pid_t pid; | |
660 | int status; | |
661 | ||
662 | gdb_assert (lp->status == 0); | |
663 | ||
cacab7c4 | 664 | pid = waitpid (GET_LWP (lp->ptid), &status, lp->cloned ? __WCLONE : 0); |
fb0e1ba7 MK |
665 | if (pid == -1 && errno == ECHILD) |
666 | /* OK, the proccess has disappeared. We'll catch the actual | |
3f07c44b | 667 | exit event in lin_lwp_wait. */ |
fb0e1ba7 MK |
668 | return 0; |
669 | ||
39f77062 | 670 | gdb_assert (pid == GET_LWP (lp->ptid)); |
fb0e1ba7 MK |
671 | |
672 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
673 | { | |
674 | gdb_assert (num_lwps > 1); | |
fb0e1ba7 | 675 | |
39f77062 | 676 | if (in_thread_list (lp->ptid)) |
e6328671 MK |
677 | { |
678 | /* Core GDB cannot deal with us deleting the current | |
679 | thread. */ | |
39f77062 KB |
680 | if (!ptid_equal (lp->ptid, inferior_ptid)) |
681 | delete_thread (lp->ptid); | |
e6328671 | 682 | printf_unfiltered ("[%s exited]\n", |
39f77062 | 683 | target_pid_to_str (lp->ptid)); |
e6328671 | 684 | } |
7ca673cd | 685 | if (debug_lin_lwp) |
9085700c | 686 | fprintf_unfiltered (gdb_stdlog, |
39f77062 | 687 | "%s exited.\n", target_pid_to_str (lp->ptid)); |
7ca673cd | 688 | |
39f77062 | 689 | delete_lwp (lp->ptid); |
fb0e1ba7 MK |
690 | return 0; |
691 | } | |
692 | ||
693 | gdb_assert (WIFSTOPPED (status)); | |
fb0e1ba7 | 694 | |
de4ca854 MK |
695 | /* Ignore any signals in FLUSH_MASK. */ |
696 | if (flush_mask && sigismember (flush_mask, WSTOPSIG (status))) | |
697 | { | |
698 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
699 | return stop_wait_callback (lp, flush_mask); | |
700 | } | |
701 | ||
fb0e1ba7 MK |
702 | if (WSTOPSIG (status) != SIGSTOP) |
703 | { | |
b1aeb4c5 | 704 | if (WSTOPSIG (status) == SIGTRAP) |
fb0e1ba7 MK |
705 | { |
706 | /* If a LWP other than the LWP that we're reporting an | |
707 | event for has hit a GDB breakpoint (as opposed to | |
708 | some random trap signal), then just arrange for it to | |
709 | hit it again later. We don't keep the SIGTRAP status | |
710 | and don't forward the SIGTRAP signal to the LWP. We | |
711 | will handle the current event, eventually we will | |
712 | resume all LWPs, and this one will get its breakpoint | |
713 | trap again. | |
714 | ||
715 | If we do not do this, then we run the risk that the | |
716 | user will delete or disable the breakpoint, but the | |
717 | thread will have already tripped on it. */ | |
7ca673cd | 718 | |
c4365b19 MS |
719 | /* Now resume this LWP and get the SIGSTOP event. */ |
720 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
b1aeb4c5 MS |
721 | if (debug_lin_lwp) |
722 | { | |
723 | fprintf_unfiltered (gdb_stderr, | |
724 | "SWC: Candidate SIGTRAP event in %ld\n", | |
725 | GET_LWP (lp->ptid)); | |
726 | } | |
727 | /* Hold the SIGTRAP for handling by lin_lwp_wait. */ | |
728 | stop_wait_callback (lp, data); | |
729 | /* If there's another event, throw it back into the queue. */ | |
730 | if (lp->status) | |
731 | kill (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
732 | /* Save the sigtrap event. */ | |
733 | lp->status = status; | |
734 | return 0; | |
fb0e1ba7 MK |
735 | } |
736 | else | |
737 | { | |
b1aeb4c5 MS |
738 | /* The thread was stopped with a signal other than |
739 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
740 | ||
7ca673cd | 741 | if (debug_lin_lwp) |
b1aeb4c5 MS |
742 | { |
743 | fprintf_unfiltered (gdb_stderr, | |
744 | "SWC: Pending event %d in %ld\n", | |
745 | WSTOPSIG (status), GET_LWP (lp->ptid)); | |
746 | } | |
747 | /* Now resume this LWP and get the SIGSTOP event. */ | |
748 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
7ca673cd | 749 | |
b1aeb4c5 MS |
750 | /* Hold this event/waitstatus while we check to see if |
751 | there are any more (we still want to get that SIGSTOP). */ | |
752 | stop_wait_callback (lp, data); | |
753 | /* If the lp->status field is still empty, use it to hold | |
754 | this event. If not, then this event must be returned | |
755 | to the event queue of the LWP. */ | |
756 | if (lp->status == 0) | |
757 | lp->status = status; | |
758 | else | |
759 | kill (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
760 | return 0; | |
fb0e1ba7 MK |
761 | } |
762 | } | |
763 | else | |
764 | { | |
765 | /* We caught the SIGSTOP that we intended to catch, so | |
766 | there's no SIGSTOP pending. */ | |
b1aeb4c5 | 767 | lp->stopped = 1; |
fb0e1ba7 MK |
768 | lp->signalled = 0; |
769 | } | |
770 | } | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | /* Return non-zero if LP has a wait status pending. */ | |
776 | ||
777 | static int | |
778 | status_callback (struct lwp_info *lp, void *data) | |
779 | { | |
fce0e6e1 MK |
780 | /* Only report a pending wait status if we pretend that this has |
781 | indeed been resumed. */ | |
782 | return (lp->status != 0 && lp->resumed); | |
fb0e1ba7 MK |
783 | } |
784 | ||
785 | /* Return non-zero if LP isn't stopped. */ | |
786 | ||
787 | static int | |
788 | running_callback (struct lwp_info *lp, void *data) | |
789 | { | |
790 | return (lp->stopped == 0); | |
791 | } | |
792 | ||
00d4fce6 | 793 | /* Count the LWP's that have had events. */ |
b1aeb4c5 MS |
794 | |
795 | static int | |
796 | count_events_callback (struct lwp_info *lp, void *data) | |
797 | { | |
798 | int *count = data; | |
799 | ||
00d4fce6 MK |
800 | gdb_assert (count != NULL); |
801 | ||
802 | /* Count only LWPs that have a SIGTRAP event pending. */ | |
803 | if (lp->status != 0 | |
804 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
b1aeb4c5 MS |
805 | (*count)++; |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
00d4fce6 | 810 | /* Select the LWP (if any) that is currently being single-stepped. */ |
b1aeb4c5 MS |
811 | |
812 | static int | |
813 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
814 | { | |
815 | if (lp->step && lp->status != 0) | |
816 | return 1; | |
817 | else | |
818 | return 0; | |
819 | } | |
820 | ||
00d4fce6 | 821 | /* Select the Nth LWP that has had a SIGTRAP event. */ |
b1aeb4c5 MS |
822 | |
823 | static int | |
824 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
825 | { | |
826 | int *selector = data; | |
827 | ||
00d4fce6 MK |
828 | gdb_assert (selector != NULL); |
829 | ||
830 | /* Select only LWPs that have a SIGTRAP event pending. */ | |
831 | if (lp->status != 0 | |
832 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
b1aeb4c5 MS |
833 | if ((*selector)-- == 0) |
834 | return 1; | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static int | |
840 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
841 | { | |
842 | struct lwp_info *event_lp = data; | |
843 | ||
00d4fce6 MK |
844 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ |
845 | if (lp == event_lp) | |
846 | return 0; | |
847 | ||
848 | /* If a LWP other than the LWP that we're reporting an event for has | |
849 | hit a GDB breakpoint (as opposed to some random trap signal), | |
850 | then just arrange for it to hit it again later. We don't keep | |
851 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
852 | LWP. We will handle the current event, eventually we will resume | |
853 | all LWPs, and this one will get its breakpoint trap again. | |
854 | ||
855 | If we do not do this, then we run the risk that the user will | |
856 | delete or disable the breakpoint, but the LWP will have already | |
857 | tripped on it. */ | |
858 | ||
859 | if (lp->status != 0 | |
860 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
861 | && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) - | |
862 | DECR_PC_AFTER_BREAK)) | |
b1aeb4c5 MS |
863 | { |
864 | if (debug_lin_lwp) | |
00d4fce6 MK |
865 | fprintf_unfiltered (gdb_stdlog, |
866 | "Push back breakpoint for LWP %ld\n", | |
867 | GET_LWP (lp->ptid)); | |
868 | ||
869 | /* Back up the PC if necessary. */ | |
b1aeb4c5 | 870 | if (DECR_PC_AFTER_BREAK) |
00d4fce6 MK |
871 | write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid); |
872 | ||
873 | /* Throw away the SIGTRAP. */ | |
b1aeb4c5 MS |
874 | lp->status = 0; |
875 | } | |
00d4fce6 | 876 | |
b1aeb4c5 MS |
877 | return 0; |
878 | } | |
879 | ||
00d4fce6 | 880 | /* Select one LWP out of those that have events pending. */ |
b1aeb4c5 MS |
881 | |
882 | static void | |
883 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
884 | { | |
885 | int num_events = 0; | |
886 | int random_selector; | |
887 | struct lwp_info *event_lp; | |
888 | ||
00d4fce6 MK |
889 | /* Record the wait status for the origional LWP. */ |
890 | (*orig_lp)->status = *status; | |
891 | ||
892 | /* Give preference to any LWP that is being single-stepped. */ | |
b1aeb4c5 MS |
893 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); |
894 | if (event_lp != NULL) | |
895 | { | |
896 | if (debug_lin_lwp) | |
00d4fce6 MK |
897 | fprintf_unfiltered (gdb_stdlog, |
898 | "Select single-step LWP %ld\n", | |
b1aeb4c5 MS |
899 | GET_LWP (event_lp->ptid)); |
900 | } | |
901 | else | |
902 | { | |
903 | /* No single-stepping LWP. Select one at random, out of those | |
00d4fce6 | 904 | which have had SIGTRAP events. */ |
b1aeb4c5 | 905 | |
00d4fce6 MK |
906 | /* First see how many SIGTRAP events we have. */ |
907 | iterate_over_lwps (count_events_callback, &num_events); | |
b1aeb4c5 | 908 | |
00d4fce6 MK |
909 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ |
910 | random_selector = (int) | |
b1aeb4c5 MS |
911 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); |
912 | ||
00d4fce6 MK |
913 | if (debug_lin_lwp && num_events > 1) |
914 | fprintf_unfiltered (gdb_stdlog, | |
915 | "Found %d SIGTRAP events, selecting #%d\n", | |
916 | num_events, random_selector); | |
b1aeb4c5 | 917 | |
00d4fce6 MK |
918 | event_lp = iterate_over_lwps (select_event_lwp_callback, |
919 | &random_selector); | |
b1aeb4c5 MS |
920 | } |
921 | ||
922 | if (event_lp != NULL) | |
923 | { | |
00d4fce6 | 924 | /* Switch the event LWP. */ |
b1aeb4c5 MS |
925 | *orig_lp = event_lp; |
926 | *status = event_lp->status; | |
b1aeb4c5 | 927 | } |
00d4fce6 MK |
928 | |
929 | /* Flush the wait status for the event LWP. */ | |
930 | (*orig_lp)->status = 0; | |
b1aeb4c5 MS |
931 | } |
932 | ||
fce0e6e1 MK |
933 | /* Return non-zero if LP has been resumed. */ |
934 | ||
935 | static int | |
936 | resumed_callback (struct lwp_info *lp, void *data) | |
937 | { | |
938 | return lp->resumed; | |
939 | } | |
940 | ||
cacab7c4 MK |
941 | #ifdef CHILD_WAIT |
942 | ||
943 | /* We need to override child_wait to support attaching to cloned | |
944 | processes, since a normal wait (as done by the default version) | |
945 | ignores those processes. */ | |
946 | ||
947 | /* Wait for child PTID to do something. Return id of the child, | |
948 | minus_one_ptid in case of error; store status into *OURSTATUS. */ | |
949 | ||
950 | ptid_t | |
951 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
952 | { | |
953 | int save_errno; | |
954 | int status; | |
955 | pid_t pid; | |
956 | ||
957 | do | |
958 | { | |
959 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
960 | attached process. */ | |
961 | set_sigio_trap (); | |
962 | ||
963 | pid = waitpid (GET_PID (ptid), &status, 0); | |
964 | if (pid == -1 && errno == ECHILD) | |
965 | /* Try again with __WCLONE to check cloned processes. */ | |
966 | pid = waitpid (GET_PID (ptid), &status, __WCLONE); | |
967 | save_errno = errno; | |
968 | ||
969 | clear_sigio_trap (); | |
970 | clear_sigint_trap (); | |
971 | } | |
2d1bfe2e | 972 | while (pid == -1 && save_errno == EINTR); |
cacab7c4 MK |
973 | |
974 | if (pid == -1) | |
975 | { | |
dc672865 | 976 | warning ("Child process unexpectedly missing: %s", safe_strerror (errno)); |
cacab7c4 MK |
977 | |
978 | /* Claim it exited with unknown signal. */ | |
979 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
980 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
981 | return minus_one_ptid; | |
982 | } | |
983 | ||
984 | store_waitstatus (ourstatus, status); | |
985 | return pid_to_ptid (pid); | |
986 | } | |
987 | ||
988 | #endif | |
989 | ||
39f77062 KB |
990 | static ptid_t |
991 | lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 MK |
992 | { |
993 | struct lwp_info *lp = NULL; | |
994 | int options = 0; | |
995 | int status = 0; | |
39f77062 | 996 | pid_t pid = PIDGET (ptid); |
de4ca854 MK |
997 | sigset_t flush_mask; |
998 | ||
999 | sigemptyset (&flush_mask); | |
fb0e1ba7 | 1000 | |
3f07c44b MK |
1001 | /* Make sure SIGCHLD is blocked. */ |
1002 | if (! sigismember (&blocked_mask, SIGCHLD)) | |
1003 | { | |
1004 | sigaddset (&blocked_mask, SIGCHLD); | |
1005 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
1006 | } | |
1007 | ||
fb0e1ba7 MK |
1008 | retry: |
1009 | ||
9a973a8f MK |
1010 | /* Make sure there is at least one LWP that has been resumed, at |
1011 | least if there are any LWPs at all. */ | |
1012 | gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL)); | |
fce0e6e1 | 1013 | |
fb0e1ba7 MK |
1014 | /* First check if there is a LWP with a wait status pending. */ |
1015 | if (pid == -1) | |
1016 | { | |
b1aeb4c5 | 1017 | /* Any LWP that's been resumed will do. */ |
fb0e1ba7 MK |
1018 | lp = iterate_over_lwps (status_callback, NULL); |
1019 | if (lp) | |
1020 | { | |
fb0e1ba7 MK |
1021 | status = lp->status; |
1022 | lp->status = 0; | |
b1aeb4c5 MS |
1023 | |
1024 | if (debug_lin_lwp && status) | |
58eeadba MK |
1025 | fprintf_unfiltered (gdb_stdlog, |
1026 | "Using pending wait status %s for LWP %ld.\n", | |
1027 | status_to_str (status), GET_LWP (lp->ptid)); | |
fb0e1ba7 MK |
1028 | } |
1029 | ||
1030 | /* But if we don't fine one, we'll have to wait, and check both | |
1031 | cloned and uncloned processes. We start with the cloned | |
1032 | processes. */ | |
1033 | options = __WCLONE | WNOHANG; | |
1034 | } | |
39f77062 | 1035 | else if (is_lwp (ptid)) |
fb0e1ba7 | 1036 | { |
7ca673cd | 1037 | if (debug_lin_lwp) |
9085700c | 1038 | fprintf_unfiltered (gdb_stdlog, |
b08cfdb6 | 1039 | "Waiting for specific LWP %ld.\n", |
ce696e05 | 1040 | GET_LWP (ptid)); |
7ca673cd | 1041 | |
fb0e1ba7 | 1042 | /* We have a specific LWP to check. */ |
39f77062 | 1043 | lp = find_lwp_pid (ptid); |
fb0e1ba7 MK |
1044 | gdb_assert (lp); |
1045 | status = lp->status; | |
1046 | lp->status = 0; | |
7ca673cd | 1047 | |
b1aeb4c5 | 1048 | if (debug_lin_lwp && status) |
58eeadba MK |
1049 | fprintf_unfiltered (gdb_stdlog, |
1050 | "Using pending wait status %s for LWP %ld.\n", | |
1051 | status_to_str (status), GET_LWP (lp->ptid)); | |
fb0e1ba7 MK |
1052 | |
1053 | /* If we have to wait, take into account whether PID is a cloned | |
1054 | process or not. And we have to convert it to something that | |
1055 | the layer beneath us can understand. */ | |
cacab7c4 | 1056 | options = lp->cloned ? __WCLONE : 0; |
39f77062 | 1057 | pid = GET_LWP (ptid); |
fb0e1ba7 MK |
1058 | } |
1059 | ||
1060 | if (status && lp->signalled) | |
1061 | { | |
1062 | /* A pending SIGSTOP may interfere with the normal stream of | |
1063 | events. In a typical case where interference is a problem, | |
1064 | we have a SIGSTOP signal pending for LWP A while | |
1065 | single-stepping it, encounter an event in LWP B, and take the | |
1066 | pending SIGSTOP while trying to stop LWP A. After processing | |
1067 | the event in LWP B, LWP A is continued, and we'll never see | |
1068 | the SIGTRAP associated with the last time we were | |
1069 | single-stepping LWP A. */ | |
1070 | ||
1071 | /* Resume the thread. It should halt immediately returning the | |
1072 | pending SIGSTOP. */ | |
39f77062 KB |
1073 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, |
1074 | TARGET_SIGNAL_0); | |
fb0e1ba7 | 1075 | lp->stopped = 0; |
fce0e6e1 | 1076 | gdb_assert (lp->resumed); |
fb0e1ba7 MK |
1077 | |
1078 | /* This should catch the pending SIGSTOP. */ | |
1079 | stop_wait_callback (lp, NULL); | |
1080 | } | |
1081 | ||
1082 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
1083 | attached process. */ | |
1084 | set_sigio_trap (); | |
1085 | ||
1086 | while (status == 0) | |
1087 | { | |
1088 | pid_t lwpid; | |
1089 | ||
1090 | lwpid = waitpid (pid, &status, options); | |
1091 | if (lwpid > 0) | |
1092 | { | |
1093 | gdb_assert (pid == -1 || lwpid == pid); | |
1094 | ||
39f77062 | 1095 | lp = find_lwp_pid (pid_to_ptid (lwpid)); |
fb0e1ba7 MK |
1096 | if (! lp) |
1097 | { | |
39f77062 | 1098 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); |
cacab7c4 MK |
1099 | if (options & __WCLONE) |
1100 | lp->cloned = 1; | |
1101 | ||
fb0e1ba7 MK |
1102 | if (threaded) |
1103 | { | |
3f07c44b MK |
1104 | gdb_assert (WIFSTOPPED (status) |
1105 | && WSTOPSIG (status) == SIGSTOP); | |
fb0e1ba7 MK |
1106 | lp->signalled = 1; |
1107 | ||
39f77062 | 1108 | if (! in_thread_list (inferior_ptid)) |
fb0e1ba7 | 1109 | { |
39f77062 KB |
1110 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), |
1111 | GET_PID (inferior_ptid)); | |
1112 | add_thread (inferior_ptid); | |
fb0e1ba7 MK |
1113 | } |
1114 | ||
39f77062 | 1115 | add_thread (lp->ptid); |
fb0e1ba7 | 1116 | printf_unfiltered ("[New %s]\n", |
39f77062 | 1117 | target_pid_to_str (lp->ptid)); |
fb0e1ba7 MK |
1118 | } |
1119 | } | |
1120 | ||
1121 | /* Make sure we don't report a TARGET_WAITKIND_EXITED or | |
1122 | TARGET_WAITKIND_SIGNALLED event if there are still LWP's | |
1123 | left in the process. */ | |
1124 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
1125 | { | |
39f77062 | 1126 | if (in_thread_list (lp->ptid)) |
fb0e1ba7 | 1127 | { |
e6328671 | 1128 | /* Core GDB cannot deal with us deleting the current |
fb0e1ba7 | 1129 | thread. */ |
39f77062 KB |
1130 | if (! ptid_equal (lp->ptid, inferior_ptid)) |
1131 | delete_thread (lp->ptid); | |
fb0e1ba7 | 1132 | printf_unfiltered ("[%s exited]\n", |
39f77062 | 1133 | target_pid_to_str (lp->ptid)); |
fb0e1ba7 | 1134 | } |
7ca673cd | 1135 | if (debug_lin_lwp) |
9085700c MS |
1136 | fprintf_unfiltered (gdb_stdlog, |
1137 | "%s exited.\n", | |
39f77062 | 1138 | target_pid_to_str (lp->ptid)); |
7ca673cd | 1139 | |
39f77062 | 1140 | delete_lwp (lp->ptid); |
fb0e1ba7 MK |
1141 | |
1142 | /* Make sure there is at least one thread running. */ | |
1143 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
1144 | ||
1145 | /* Discard the event. */ | |
1146 | status = 0; | |
1147 | continue; | |
1148 | } | |
1149 | ||
1150 | /* Make sure we don't report a SIGSTOP that we sent | |
1151 | ourselves in an attempt to stop an LWP. */ | |
1152 | if (lp->signalled && WIFSTOPPED (status) | |
1153 | && WSTOPSIG (status) == SIGSTOP) | |
1154 | { | |
7ca673cd | 1155 | if (debug_lin_lwp) |
9085700c MS |
1156 | fprintf_unfiltered (gdb_stdlog, |
1157 | "Delayed SIGSTOP caught for %s.\n", | |
39f77062 | 1158 | target_pid_to_str (lp->ptid)); |
7ca673cd | 1159 | |
fb0e1ba7 MK |
1160 | /* This is a delayed SIGSTOP. */ |
1161 | lp->signalled = 0; | |
1162 | ||
39f77062 KB |
1163 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, |
1164 | TARGET_SIGNAL_0); | |
fb0e1ba7 | 1165 | lp->stopped = 0; |
fce0e6e1 | 1166 | gdb_assert (lp->resumed); |
fb0e1ba7 MK |
1167 | |
1168 | /* Discard the event. */ | |
1169 | status = 0; | |
1170 | continue; | |
1171 | } | |
1172 | ||
1173 | break; | |
1174 | } | |
1175 | ||
1176 | if (pid == -1) | |
1177 | { | |
1178 | /* Alternate between checking cloned and uncloned processes. */ | |
1179 | options ^= __WCLONE; | |
1180 | ||
1181 | /* And suspend every time we have checked both. */ | |
1182 | if (options & __WCLONE) | |
1183 | sigsuspend (&suspend_mask); | |
1184 | } | |
1185 | ||
1186 | /* We shouldn't end up here unless we want to try again. */ | |
1187 | gdb_assert (status == 0); | |
1188 | } | |
1189 | ||
1190 | clear_sigio_trap (); | |
1191 | clear_sigint_trap (); | |
1192 | ||
1193 | gdb_assert (lp); | |
1194 | ||
1195 | /* Don't report signals that GDB isn't interested in, such as | |
1196 | signals that are neither printed nor stopped upon. Stopping all | |
1197 | threads can be a bit time-consuming so if we want decent | |
1198 | performance with heavily multi-threaded programs, especially when | |
1199 | they're using a high frequency timer, we'd better avoid it if we | |
1200 | can. */ | |
1201 | ||
1202 | if (WIFSTOPPED (status)) | |
1203 | { | |
1204 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
1205 | ||
1206 | if (signal_stop_state (signo) == 0 | |
1207 | && signal_print_state (signo) == 0 | |
1208 | && signal_pass_state (signo) == 1) | |
1209 | { | |
fce0e6e1 MK |
1210 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads |
1211 | here? It is not clear we should. GDB may not expect | |
1212 | other threads to run. On the other hand, not resuming | |
1213 | newly attached threads may cause an unwanted delay in | |
1214 | getting them running. */ | |
c4365b19 | 1215 | child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo); |
fce0e6e1 | 1216 | lp->stopped = 0; |
fb0e1ba7 MK |
1217 | status = 0; |
1218 | goto retry; | |
1219 | } | |
de4ca854 MK |
1220 | |
1221 | if (signo == TARGET_SIGNAL_INT | |
1222 | && signal_pass_state (signo) == 0) | |
1223 | { | |
1224 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
1225 | forwarded to the entire process group, that is, all LWP's | |
1226 | will receive it. Since we only want to report it once, | |
1227 | we try to flush it from all LWPs except this one. */ | |
1228 | sigaddset (&flush_mask, SIGINT); | |
1229 | } | |
fb0e1ba7 MK |
1230 | } |
1231 | ||
1232 | /* This LWP is stopped now. */ | |
1233 | lp->stopped = 1; | |
1234 | ||
b1aeb4c5 | 1235 | if (debug_lin_lwp) |
58eeadba MK |
1236 | fprintf_unfiltered (gdb_stdlog, "Candidate event %s in LWP %ld.\n", |
1237 | status_to_str (status), GET_LWP (lp->ptid)); | |
b1aeb4c5 | 1238 | |
fb0e1ba7 MK |
1239 | /* Now stop all other LWP's ... */ |
1240 | iterate_over_lwps (stop_callback, NULL); | |
1241 | ||
1242 | /* ... and wait until all of them have reported back that they're no | |
1243 | longer running. */ | |
de4ca854 | 1244 | iterate_over_lwps (stop_wait_callback, &flush_mask); |
fb0e1ba7 | 1245 | |
00d4fce6 MK |
1246 | /* If we're not waiting for a specific LWP, choose an event LWP from |
1247 | among those that have had events. Giving equal priority to all | |
1248 | LWPs that have had events helps prevent starvation. */ | |
1249 | if (pid == -1) | |
1250 | select_event_lwp (&lp, &status); | |
b1aeb4c5 | 1251 | |
00d4fce6 MK |
1252 | /* Now that we've selected our final event LWP, cancel any |
1253 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
1254 | the comment in cancel_breakpoints_callback to find out why. */ | |
1255 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
b1aeb4c5 | 1256 | |
fb0e1ba7 MK |
1257 | /* If we're not running in "threaded" mode, we'll report the bare |
1258 | process id. */ | |
1259 | ||
1260 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
b1aeb4c5 MS |
1261 | { |
1262 | trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
1263 | if (debug_lin_lwp) | |
1264 | fprintf_unfiltered (gdb_stdlog, | |
1265 | "LLW: trap_ptid is %ld\n", | |
1266 | GET_LWP (trap_ptid)); | |
1267 | } | |
fb0e1ba7 | 1268 | else |
39f77062 | 1269 | trap_ptid = null_ptid; |
fb0e1ba7 MK |
1270 | |
1271 | store_waitstatus (ourstatus, status); | |
39f77062 | 1272 | return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); |
fb0e1ba7 MK |
1273 | } |
1274 | ||
1275 | static int | |
1276 | kill_callback (struct lwp_info *lp, void *data) | |
1277 | { | |
39f77062 | 1278 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); |
fb0e1ba7 MK |
1279 | return 0; |
1280 | } | |
1281 | ||
1282 | static int | |
1283 | kill_wait_callback (struct lwp_info *lp, void *data) | |
1284 | { | |
1285 | pid_t pid; | |
1286 | ||
1287 | /* We must make sure that there are no pending events (delayed | |
1288 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
1289 | program doesn't interfere with any following debugging session. */ | |
1290 | ||
1291 | /* For cloned processes we must check both with __WCLONE and | |
1292 | without, since the exit status of a cloned process isn't reported | |
1293 | with __WCLONE. */ | |
cacab7c4 | 1294 | if (lp->cloned) |
fb0e1ba7 MK |
1295 | { |
1296 | do | |
1297 | { | |
39f77062 | 1298 | pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
fb0e1ba7 | 1299 | } |
39f77062 | 1300 | while (pid == GET_LWP (lp->ptid)); |
fb0e1ba7 MK |
1301 | |
1302 | gdb_assert (pid == -1 && errno == ECHILD); | |
1303 | } | |
1304 | ||
1305 | do | |
1306 | { | |
39f77062 | 1307 | pid = waitpid (GET_LWP (lp->ptid), NULL, 0); |
fb0e1ba7 | 1308 | } |
39f77062 | 1309 | while (pid == GET_LWP (lp->ptid)); |
fb0e1ba7 MK |
1310 | |
1311 | gdb_assert (pid == -1 && errno == ECHILD); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | static void | |
1316 | lin_lwp_kill (void) | |
1317 | { | |
1318 | /* Kill all LWP's ... */ | |
1319 | iterate_over_lwps (kill_callback, NULL); | |
1320 | ||
1321 | /* ... and wait until we've flushed all events. */ | |
1322 | iterate_over_lwps (kill_wait_callback, NULL); | |
1323 | ||
1324 | target_mourn_inferior (); | |
1325 | } | |
1326 | ||
1327 | static void | |
1328 | lin_lwp_create_inferior (char *exec_file, char *allargs, char **env) | |
1329 | { | |
c194fbe1 | 1330 | child_ops.to_create_inferior (exec_file, allargs, env); |
fb0e1ba7 MK |
1331 | } |
1332 | ||
1333 | static void | |
1334 | lin_lwp_mourn_inferior (void) | |
1335 | { | |
c194fbe1 | 1336 | trap_ptid = null_ptid; |
fb0e1ba7 | 1337 | |
c194fbe1 | 1338 | /* Destroy LWP info; it's no longer valid. */ |
fb0e1ba7 MK |
1339 | init_lwp_list (); |
1340 | ||
4c8de859 | 1341 | /* Restore the original signal mask. */ |
3f07c44b MK |
1342 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); |
1343 | sigemptyset (&blocked_mask); | |
1344 | ||
c194fbe1 | 1345 | child_ops.to_mourn_inferior (); |
fb0e1ba7 MK |
1346 | } |
1347 | ||
1348 | static void | |
1349 | lin_lwp_fetch_registers (int regno) | |
1350 | { | |
39f77062 | 1351 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 1352 | |
39f77062 KB |
1353 | if (is_lwp (inferior_ptid)) |
1354 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
fb0e1ba7 MK |
1355 | |
1356 | fetch_inferior_registers (regno); | |
1357 | ||
1358 | do_cleanups (old_chain); | |
1359 | } | |
1360 | ||
1361 | static void | |
1362 | lin_lwp_store_registers (int regno) | |
1363 | { | |
39f77062 | 1364 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 1365 | |
39f77062 KB |
1366 | if (is_lwp (inferior_ptid)) |
1367 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
fb0e1ba7 MK |
1368 | |
1369 | store_inferior_registers (regno); | |
1370 | ||
1371 | do_cleanups (old_chain); | |
1372 | } | |
1373 | ||
1374 | static int | |
1375 | lin_lwp_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
e5da8f38 | 1376 | struct mem_attrib *attrib, |
fb0e1ba7 MK |
1377 | struct target_ops *target) |
1378 | { | |
39f77062 | 1379 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
1380 | int xfer; |
1381 | ||
39f77062 KB |
1382 | if (is_lwp (inferior_ptid)) |
1383 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
fb0e1ba7 | 1384 | |
e5da8f38 | 1385 | xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
fb0e1ba7 MK |
1386 | |
1387 | do_cleanups (old_chain); | |
1388 | return xfer; | |
1389 | } | |
1390 | ||
1391 | static int | |
39f77062 | 1392 | lin_lwp_thread_alive (ptid_t ptid) |
fb0e1ba7 | 1393 | { |
39f77062 | 1394 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 MK |
1395 | |
1396 | errno = 0; | |
39f77062 | 1397 | ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0); |
fb0e1ba7 MK |
1398 | if (errno) |
1399 | return 0; | |
1400 | ||
1401 | return 1; | |
1402 | } | |
1403 | ||
1404 | static char * | |
39f77062 | 1405 | lin_lwp_pid_to_str (ptid_t ptid) |
fb0e1ba7 MK |
1406 | { |
1407 | static char buf[64]; | |
1408 | ||
39f77062 | 1409 | if (is_lwp (ptid)) |
fb0e1ba7 | 1410 | { |
b08cfdb6 | 1411 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); |
fb0e1ba7 MK |
1412 | return buf; |
1413 | } | |
1414 | ||
39f77062 | 1415 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1416 | } |
1417 | ||
1418 | static void | |
1419 | init_lin_lwp_ops (void) | |
1420 | { | |
1421 | #if 0 | |
1422 | lin_lwp_ops.to_open = lin_lwp_open; | |
1423 | #endif | |
1424 | lin_lwp_ops.to_shortname = "lwp-layer"; | |
1425 | lin_lwp_ops.to_longname = "lwp-layer"; | |
1426 | lin_lwp_ops.to_doc = "Low level threads support (LWP layer)"; | |
1427 | lin_lwp_ops.to_attach = lin_lwp_attach; | |
1428 | lin_lwp_ops.to_detach = lin_lwp_detach; | |
1429 | lin_lwp_ops.to_resume = lin_lwp_resume; | |
1430 | lin_lwp_ops.to_wait = lin_lwp_wait; | |
1431 | lin_lwp_ops.to_fetch_registers = lin_lwp_fetch_registers; | |
1432 | lin_lwp_ops.to_store_registers = lin_lwp_store_registers; | |
1433 | lin_lwp_ops.to_xfer_memory = lin_lwp_xfer_memory; | |
1434 | lin_lwp_ops.to_kill = lin_lwp_kill; | |
1435 | lin_lwp_ops.to_create_inferior = lin_lwp_create_inferior; | |
1436 | lin_lwp_ops.to_mourn_inferior = lin_lwp_mourn_inferior; | |
1437 | lin_lwp_ops.to_thread_alive = lin_lwp_thread_alive; | |
1438 | lin_lwp_ops.to_pid_to_str = lin_lwp_pid_to_str; | |
1439 | lin_lwp_ops.to_stratum = thread_stratum; | |
1440 | lin_lwp_ops.to_has_thread_control = tc_schedlock; | |
1441 | lin_lwp_ops.to_magic = OPS_MAGIC; | |
1442 | } | |
1443 | ||
1444 | static void | |
1445 | sigchld_handler (int signo) | |
1446 | { | |
1447 | /* Do nothing. The only reason for this handler is that it allows | |
1448 | us to use sigsuspend in lin_lwp_wait above to wait for the | |
1449 | arrival of a SIGCHLD. */ | |
1450 | } | |
1451 | ||
1452 | void | |
1453 | _initialize_lin_lwp (void) | |
1454 | { | |
1455 | struct sigaction action; | |
fb0e1ba7 MK |
1456 | |
1457 | extern void thread_db_init (struct target_ops *); | |
1458 | ||
1459 | init_lin_lwp_ops (); | |
1460 | add_target (&lin_lwp_ops); | |
1461 | thread_db_init (&lin_lwp_ops); | |
1462 | ||
4c8de859 | 1463 | /* Save the original signal mask. */ |
3f07c44b MK |
1464 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
1465 | ||
fb0e1ba7 MK |
1466 | action.sa_handler = sigchld_handler; |
1467 | sigemptyset (&action.sa_mask); | |
1468 | action.sa_flags = 0; | |
1469 | sigaction (SIGCHLD, &action, NULL); | |
1470 | ||
3f07c44b MK |
1471 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ |
1472 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
fb0e1ba7 | 1473 | sigdelset (&suspend_mask, SIGCHLD); |
3f07c44b MK |
1474 | |
1475 | sigemptyset (&blocked_mask); | |
7ca673cd MS |
1476 | |
1477 | add_show_from_set (add_set_cmd ("lin-lwp", no_class, var_zinteger, | |
1478 | (char *) &debug_lin_lwp, | |
8605d56e | 1479 | "Set debugging of GNU/Linux lwp module.\n\ |
7ca673cd MS |
1480 | Enables printf debugging output.\n", |
1481 | &setdebuglist), | |
1482 | &showdebuglist); | |
fb0e1ba7 MK |
1483 | } |
1484 | \f | |
1485 | ||
1486 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
8605d56e AC |
1487 | the GNU/Linux Threads library and therefore doesn't really belong |
1488 | here. */ | |
fb0e1ba7 MK |
1489 | |
1490 | /* Read variable NAME in the target and return its value if found. | |
1491 | Otherwise return zero. It is assumed that the type of the variable | |
1492 | is `int'. */ | |
1493 | ||
1494 | static int | |
1495 | get_signo (const char *name) | |
1496 | { | |
1497 | struct minimal_symbol *ms; | |
1498 | int signo; | |
1499 | ||
1500 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
1501 | if (ms == NULL) | |
1502 | return 0; | |
1503 | ||
1504 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo, | |
1505 | sizeof (signo)) != 0) | |
1506 | return 0; | |
1507 | ||
1508 | return signo; | |
1509 | } | |
1510 | ||
1511 | /* Return the set of signals used by the threads library in *SET. */ | |
1512 | ||
1513 | void | |
1514 | lin_thread_get_thread_signals (sigset_t *set) | |
1515 | { | |
3f07c44b MK |
1516 | struct sigaction action; |
1517 | int restart, cancel; | |
fb0e1ba7 MK |
1518 | |
1519 | sigemptyset (set); | |
1520 | ||
1521 | restart = get_signo ("__pthread_sig_restart"); | |
1522 | if (restart == 0) | |
1523 | return; | |
1524 | ||
1525 | cancel = get_signo ("__pthread_sig_cancel"); | |
1526 | if (cancel == 0) | |
1527 | return; | |
1528 | ||
1529 | sigaddset (set, restart); | |
1530 | sigaddset (set, cancel); | |
3f07c44b | 1531 | |
8605d56e AC |
1532 | /* The GNU/Linux Threads library makes terminating threads send a |
1533 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
1534 | those (to prevent them from terminating GDB itself, which is | |
1535 | likely to be their default action) and treat them the same way as | |
1536 | SIGCHLD. */ | |
3f07c44b MK |
1537 | |
1538 | action.sa_handler = sigchld_handler; | |
1539 | sigemptyset (&action.sa_mask); | |
1540 | action.sa_flags = 0; | |
1541 | sigaction (cancel, &action, NULL); | |
1542 | ||
1543 | /* We block the "cancel" signal throughout this code ... */ | |
1544 | sigaddset (&blocked_mask, cancel); | |
1545 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
1546 | ||
1547 | /* ... except during a sigsuspend. */ | |
1548 | sigdelset (&suspend_mask, cancel); | |
fb0e1ba7 | 1549 | } |