Commit | Line | Data |
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ac264b3b MS |
1 | /* GNU/Linux native-dependent code for debugging multiple forks. |
2 | ||
0fb0cc75 | 3 | Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
ac264b3b MS |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
ac264b3b MS |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ac264b3b MS |
19 | |
20 | #include "defs.h" | |
5af949e3 | 21 | #include "arch-utils.h" |
ac264b3b MS |
22 | #include "inferior.h" |
23 | #include "regcache.h" | |
24 | #include "gdbcmd.h" | |
25 | #include "infcall.h" | |
3e3b026f | 26 | #include "objfiles.h" |
791b663b | 27 | #include "gdb_assert.h" |
ac264b3b MS |
28 | #include "gdb_string.h" |
29 | #include "linux-fork.h" | |
f973ed9c | 30 | #include "linux-nat.h" |
ac264b3b MS |
31 | |
32 | #include <sys/ptrace.h> | |
3c61c145 | 33 | #include "gdb_wait.h" |
ac264b3b | 34 | #include <sys/param.h> |
91c06669 | 35 | #include "gdb_dirent.h" |
ac264b3b MS |
36 | #include <ctype.h> |
37 | ||
38 | struct fork_info *fork_list; | |
39 | static int highest_fork_num; | |
40 | ||
41 | /* Prevent warning from -Wmissing-prototypes. */ | |
42 | extern void _initialize_linux_fork (void); | |
43 | ||
44 | int detach_fork = 1; /* Default behavior is to detach | |
45 | newly forked processes (legacy). */ | |
46 | ||
47 | /* Fork list data structure: */ | |
48 | struct fork_info | |
49 | { | |
50 | struct fork_info *next; | |
51 | ptid_t ptid; | |
52 | int num; /* Convenient handle (GDB fork id) */ | |
53 | struct regcache *savedregs; /* Convenient for info fork, saves | |
54 | having to actually switch contexts. */ | |
55 | int clobber_regs; /* True if we should restore saved regs. */ | |
ac264b3b MS |
56 | off_t *filepos; /* Set of open file descriptors' offsets. */ |
57 | int maxfd; | |
58 | }; | |
59 | ||
60 | /* Fork list methods: */ | |
61 | ||
62 | extern int | |
63 | forks_exist_p (void) | |
64 | { | |
65 | return (fork_list != NULL); | |
66 | } | |
67 | ||
68 | /* Add a fork to internal fork list. | |
69 | Called from linux child_follow_fork. */ | |
70 | ||
71 | extern struct fork_info * | |
72 | add_fork (pid_t pid) | |
73 | { | |
74 | struct fork_info *fp; | |
75 | ||
56aac7e8 | 76 | if (fork_list == NULL && pid != PIDGET (inferior_ptid)) |
ac264b3b MS |
77 | { |
78 | /* Special case -- if this is the first fork in the list | |
79 | (the list is hitherto empty), and if this new fork is | |
80 | NOT the current inferior_ptid, then add inferior_ptid | |
81 | first, as a special zeroeth fork id. */ | |
82 | highest_fork_num = -1; | |
83 | add_fork (PIDGET (inferior_ptid)); /* safe recursion */ | |
84 | } | |
85 | ||
86 | fp = XZALLOC (struct fork_info); | |
f973ed9c | 87 | fp->ptid = ptid_build (pid, pid, 0); |
ac264b3b MS |
88 | fp->num = ++highest_fork_num; |
89 | fp->next = fork_list; | |
90 | fork_list = fp; | |
91 | return fp; | |
92 | } | |
93 | ||
94 | static void | |
95 | free_fork (struct fork_info *fp) | |
96 | { | |
97 | /* Notes on step-resume breakpoints: since this is a concern for | |
98 | threads, let's convince ourselves that it's not a concern for | |
99 | forks. There are two ways for a fork_info to be created. First, | |
100 | by the checkpoint command, in which case we're at a gdb prompt | |
101 | and there can't be any step-resume breakpoint. Second, by a fork | |
102 | in the user program, in which case we *may* have stepped into the | |
103 | fork call, but regardless of whether we follow the parent or the | |
104 | child, we will return to the same place and the step-resume | |
105 | breakpoint, if any, will take care of itself as usual. And | |
106 | unlike threads, we do not save a private copy of the step-resume | |
107 | breakpoint -- so we're OK. */ | |
108 | ||
109 | if (fp) | |
110 | { | |
111 | if (fp->savedregs) | |
112 | regcache_xfree (fp->savedregs); | |
113 | if (fp->filepos) | |
114 | xfree (fp->filepos); | |
115 | xfree (fp); | |
116 | } | |
117 | } | |
118 | ||
119 | static void | |
120 | delete_fork (ptid_t ptid) | |
121 | { | |
122 | struct fork_info *fp, *fpprev; | |
123 | ||
124 | fpprev = NULL; | |
125 | ||
126 | for (fp = fork_list; fp; fpprev = fp, fp = fp->next) | |
127 | if (ptid_equal (fp->ptid, ptid)) | |
128 | break; | |
129 | ||
130 | if (!fp) | |
131 | return; | |
132 | ||
133 | if (fpprev) | |
134 | fpprev->next = fp->next; | |
135 | else | |
136 | fork_list = fp->next; | |
137 | ||
138 | free_fork (fp); | |
139 | ||
140 | /* Special case: if there is now only one process in the list, | |
141 | and if it is (hopefully!) the current inferior_ptid, then | |
142 | remove it, leaving the list empty -- we're now down to the | |
143 | default case of debugging a single process. */ | |
144 | if (fork_list != NULL && fork_list->next == NULL && | |
145 | ptid_equal (fork_list->ptid, inferior_ptid)) | |
146 | { | |
147 | /* Last fork -- delete from list and handle as solo process | |
148 | (should be a safe recursion). */ | |
149 | delete_fork (inferior_ptid); | |
150 | } | |
151 | } | |
152 | ||
153 | /* Find a fork_info by matching PTID. */ | |
154 | static struct fork_info * | |
155 | find_fork_ptid (ptid_t ptid) | |
156 | { | |
157 | struct fork_info *fp; | |
158 | ||
159 | for (fp = fork_list; fp; fp = fp->next) | |
160 | if (ptid_equal (fp->ptid, ptid)) | |
161 | return fp; | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
166 | /* Find a fork_info by matching ID. */ | |
167 | static struct fork_info * | |
168 | find_fork_id (int num) | |
169 | { | |
170 | struct fork_info *fp; | |
171 | ||
172 | for (fp = fork_list; fp; fp = fp->next) | |
173 | if (fp->num == num) | |
174 | return fp; | |
175 | ||
176 | return NULL; | |
177 | } | |
178 | ||
179 | /* Find a fork_info by matching pid. */ | |
180 | extern struct fork_info * | |
181 | find_fork_pid (pid_t pid) | |
182 | { | |
183 | struct fork_info *fp; | |
184 | ||
185 | for (fp = fork_list; fp; fp = fp->next) | |
186 | if (pid == ptid_get_pid (fp->ptid)) | |
187 | return fp; | |
188 | ||
189 | return NULL; | |
190 | } | |
191 | ||
192 | static ptid_t | |
193 | fork_id_to_ptid (int num) | |
194 | { | |
195 | struct fork_info *fork = find_fork_id (num); | |
196 | if (fork) | |
197 | return fork->ptid; | |
198 | else | |
199 | return pid_to_ptid (-1); | |
200 | } | |
201 | ||
202 | static void | |
203 | init_fork_list (void) | |
204 | { | |
205 | struct fork_info *fp, *fpnext; | |
206 | ||
207 | if (!fork_list) | |
208 | return; | |
209 | ||
210 | for (fp = fork_list; fp; fp = fpnext) | |
211 | { | |
212 | fpnext = fp->next; | |
213 | free_fork (fp); | |
214 | } | |
215 | ||
216 | fork_list = NULL; | |
217 | } | |
218 | ||
219 | /* Fork list <-> gdb interface. */ | |
220 | ||
221 | /* Utility function for fork_load/fork_save. | |
222 | Calls lseek in the (current) inferior process. */ | |
223 | ||
224 | static off_t | |
225 | call_lseek (int fd, off_t offset, int whence) | |
226 | { | |
227 | char exp[80]; | |
228 | ||
229 | snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)", | |
230 | fd, (long) offset, whence); | |
231 | return (off_t) parse_and_eval_long (&exp[0]); | |
232 | } | |
233 | ||
234 | /* Load infrun state for the fork PTID. */ | |
235 | ||
236 | static void | |
237 | fork_load_infrun_state (struct fork_info *fp) | |
238 | { | |
239 | extern void nullify_last_target_wait_ptid (); | |
240 | int i; | |
241 | ||
2277426b | 242 | linux_nat_switch_fork (fp->ptid); |
f973ed9c | 243 | |
ac264b3b | 244 | if (fp->savedregs && fp->clobber_regs) |
594f7785 | 245 | regcache_cpy (get_current_regcache (), fp->savedregs); |
ac264b3b | 246 | |
791b663b DJ |
247 | registers_changed (); |
248 | reinit_frame_cache (); | |
249 | ||
fb14de7b | 250 | stop_pc = regcache_read_pc (get_current_regcache ()); |
ac264b3b MS |
251 | nullify_last_target_wait_ptid (); |
252 | ||
253 | /* Now restore the file positions of open file descriptors. */ | |
254 | if (fp->filepos) | |
255 | { | |
256 | for (i = 0; i <= fp->maxfd; i++) | |
257 | if (fp->filepos[i] != (off_t) -1) | |
258 | call_lseek (i, fp->filepos[i], SEEK_SET); | |
259 | /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because | |
260 | this is native-only. If it ever has to be cross, we'll have | |
261 | to rethink this. */ | |
262 | } | |
263 | } | |
264 | ||
265 | /* Save infrun state for the fork PTID. | |
266 | Exported for use by linux child_follow_fork. */ | |
267 | ||
2277426b | 268 | static void |
ac264b3b MS |
269 | fork_save_infrun_state (struct fork_info *fp, int clobber_regs) |
270 | { | |
271 | char path[MAXPATHLEN]; | |
272 | struct dirent *de; | |
273 | DIR *d; | |
274 | ||
275 | if (fp->savedregs) | |
276 | regcache_xfree (fp->savedregs); | |
277 | ||
594f7785 | 278 | fp->savedregs = regcache_dup (get_current_regcache ()); |
ac264b3b | 279 | fp->clobber_regs = clobber_regs; |
ac264b3b MS |
280 | |
281 | if (clobber_regs) | |
282 | { | |
283 | /* Now save the 'state' (file position) of all open file descriptors. | |
284 | Unfortunately fork does not take care of that for us... */ | |
285 | snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid)); | |
286 | if ((d = opendir (path)) != NULL) | |
287 | { | |
288 | long tmp; | |
289 | ||
290 | fp->maxfd = 0; | |
291 | while ((de = readdir (d)) != NULL) | |
292 | { | |
293 | /* Count open file descriptors (actually find highest | |
294 | numbered). */ | |
295 | tmp = strtol (&de->d_name[0], NULL, 10); | |
296 | if (fp->maxfd < tmp) | |
297 | fp->maxfd = tmp; | |
298 | } | |
299 | /* Allocate array of file positions. */ | |
300 | fp->filepos = xrealloc (fp->filepos, | |
301 | (fp->maxfd + 1) * sizeof (*fp->filepos)); | |
302 | ||
303 | /* Initialize to -1 (invalid). */ | |
304 | for (tmp = 0; tmp <= fp->maxfd; tmp++) | |
305 | fp->filepos[tmp] = -1; | |
306 | ||
307 | /* Now find actual file positions. */ | |
308 | rewinddir (d); | |
309 | while ((de = readdir (d)) != NULL) | |
310 | if (isdigit (de->d_name[0])) | |
311 | { | |
312 | tmp = strtol (&de->d_name[0], NULL, 10); | |
313 | fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR); | |
314 | } | |
315 | closedir (d); | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
320 | /* Kill 'em all, let God sort 'em out... */ | |
321 | ||
322 | extern void | |
323 | linux_fork_killall (void) | |
324 | { | |
325 | /* Walk list and kill every pid. No need to treat the | |
326 | current inferior_ptid as special (we do not return a | |
327 | status for it) -- however any process may be a child | |
328 | or a parent, so may get a SIGCHLD from a previously | |
329 | killed child. Wait them all out. */ | |
56aac7e8 | 330 | struct fork_info *fp; |
ac264b3b MS |
331 | pid_t pid, ret; |
332 | int status; | |
333 | ||
56aac7e8 MS |
334 | for (fp = fork_list; fp; fp = fp->next) |
335 | { | |
336 | pid = PIDGET (fp->ptid); | |
337 | do { | |
4c28f408 PA |
338 | /* Use SIGKILL instead of PTRACE_KILL because the former works even |
339 | if the thread is running, while the later doesn't. */ | |
340 | kill (pid, SIGKILL); | |
56aac7e8 MS |
341 | ret = waitpid (pid, &status, 0); |
342 | /* We might get a SIGCHLD instead of an exit status. This is | |
343 | aggravated by the first kill above - a child has just | |
344 | died. MVS comment cut-and-pasted from linux-nat. */ | |
345 | } while (ret == pid && WIFSTOPPED (status)); | |
346 | } | |
347 | init_fork_list (); /* Clear list, prepare to start fresh. */ | |
ac264b3b MS |
348 | } |
349 | ||
350 | /* The current inferior_ptid has exited, but there are other viable | |
351 | forks to debug. Delete the exiting one and context-switch to the | |
352 | first available. */ | |
353 | ||
354 | extern void | |
355 | linux_fork_mourn_inferior (void) | |
356 | { | |
357 | /* Wait just one more time to collect the inferior's exit status. | |
358 | Do not check whether this succeeds though, since we may be | |
359 | dealing with a process that we attached to. Such a process will | |
360 | only report its exit status to its original parent. */ | |
361 | int status; | |
362 | ||
363 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); | |
364 | ||
365 | /* OK, presumably inferior_ptid is the one who has exited. | |
366 | We need to delete that one from the fork_list, and switch | |
367 | to the next available fork. */ | |
368 | delete_fork (inferior_ptid); | |
791b663b DJ |
369 | |
370 | /* There should still be a fork - if there's only one left, | |
371 | delete_fork won't remove it, because we haven't updated | |
372 | inferior_ptid yet. */ | |
373 | gdb_assert (fork_list); | |
374 | ||
375 | fork_load_infrun_state (fork_list); | |
376 | printf_filtered (_("[Switching to %s]\n"), | |
377 | target_pid_to_str (inferior_ptid)); | |
378 | ||
379 | /* If there's only one fork, switch back to non-fork mode. */ | |
380 | if (fork_list->next == NULL) | |
381 | delete_fork (inferior_ptid); | |
ac264b3b MS |
382 | } |
383 | ||
7a7d3353 PA |
384 | /* The current inferior_ptid is being detached, but there are other |
385 | viable forks to debug. Detach and delete it and context-switch to | |
386 | the first available. */ | |
387 | ||
388 | extern void | |
389 | linux_fork_detach (char *args, int from_tty) | |
390 | { | |
391 | /* OK, inferior_ptid is the one we are detaching from. We need to | |
392 | delete it from the fork_list, and switch to the next available | |
393 | fork. */ | |
394 | ||
395 | if (ptrace (PTRACE_DETACH, PIDGET (inferior_ptid), 0, 0)) | |
396 | error (_("Unable to detach %s"), target_pid_to_str (inferior_ptid)); | |
397 | ||
398 | delete_fork (inferior_ptid); | |
7a7d3353 PA |
399 | |
400 | /* There should still be a fork - if there's only one left, | |
401 | delete_fork won't remove it, because we haven't updated | |
402 | inferior_ptid yet. */ | |
403 | gdb_assert (fork_list); | |
404 | ||
405 | fork_load_infrun_state (fork_list); | |
406 | ||
407 | if (from_tty) | |
408 | printf_filtered (_("[Switching to %s]\n"), | |
409 | target_pid_to_str (inferior_ptid)); | |
410 | ||
411 | /* If there's only one fork, switch back to non-fork mode. */ | |
412 | if (fork_list->next == NULL) | |
413 | delete_fork (inferior_ptid); | |
414 | } | |
415 | ||
ac264b3b MS |
416 | /* Fork list <-> user interface. */ |
417 | ||
418 | static void | |
419 | delete_fork_command (char *args, int from_tty) | |
420 | { | |
421 | ptid_t ptid; | |
422 | ||
423 | if (!args || !*args) | |
2277426b | 424 | error (_("Requires argument (checkpoint id to delete)")); |
ac264b3b MS |
425 | |
426 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
427 | if (ptid_equal (ptid, minus_one_ptid)) | |
2277426b | 428 | error (_("No such checkpoint id, %s"), args); |
ac264b3b MS |
429 | |
430 | if (ptid_equal (ptid, inferior_ptid)) | |
2277426b | 431 | error (_("Please switch to another checkpoint before deleting the current one")); |
ac264b3b | 432 | |
1dce6535 | 433 | if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0)) |
54ba13f7 | 434 | error (_("Unable to kill pid %s"), target_pid_to_str (ptid)); |
ac264b3b MS |
435 | |
436 | if (from_tty) | |
437 | printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid)); | |
438 | ||
439 | delete_fork (ptid); | |
440 | } | |
441 | ||
442 | static void | |
443 | detach_fork_command (char *args, int from_tty) | |
444 | { | |
445 | ptid_t ptid; | |
446 | ||
447 | if (!args || !*args) | |
2277426b | 448 | error (_("Requires argument (checkpoint id to detach)")); |
ac264b3b MS |
449 | |
450 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
451 | if (ptid_equal (ptid, minus_one_ptid)) | |
2277426b | 452 | error (_("No such checkpoint id, %s"), args); |
ac264b3b MS |
453 | |
454 | if (ptid_equal (ptid, inferior_ptid)) | |
2277426b PA |
455 | error (_("\ |
456 | Please switch to another checkpoint before detaching the current one")); | |
ac264b3b | 457 | |
1dce6535 | 458 | if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0)) |
ac264b3b MS |
459 | error (_("Unable to detach %s"), target_pid_to_str (ptid)); |
460 | ||
461 | if (from_tty) | |
462 | printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid)); | |
463 | ||
464 | delete_fork (ptid); | |
465 | } | |
466 | ||
467 | /* Print information about currently known forks. */ | |
468 | ||
469 | static void | |
470 | info_forks_command (char *arg, int from_tty) | |
471 | { | |
5af949e3 | 472 | struct gdbarch *gdbarch = get_current_arch (); |
ac264b3b MS |
473 | struct frame_info *cur_frame; |
474 | struct symtab_and_line sal; | |
475 | struct symtab *cur_symtab; | |
476 | struct fork_info *fp; | |
477 | int cur_line; | |
478 | ULONGEST pc; | |
b8db102d MS |
479 | int requested = -1; |
480 | struct fork_info *printed = NULL; | |
481 | ||
482 | if (arg && *arg) | |
483 | requested = (int) parse_and_eval_long (arg); | |
ac264b3b MS |
484 | |
485 | for (fp = fork_list; fp; fp = fp->next) | |
486 | { | |
b8db102d MS |
487 | if (requested > 0 && fp->num != requested) |
488 | continue; | |
489 | ||
490 | printed = fp; | |
ac264b3b MS |
491 | if (ptid_equal (fp->ptid, inferior_ptid)) |
492 | { | |
493 | printf_filtered ("* "); | |
fb14de7b | 494 | pc = regcache_read_pc (get_current_regcache ()); |
ac264b3b MS |
495 | } |
496 | else | |
497 | { | |
498 | printf_filtered (" "); | |
2277426b | 499 | pc = regcache_read_pc (fp->savedregs); |
ac264b3b MS |
500 | } |
501 | printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid)); | |
502 | if (fp->num == 0) | |
503 | printf_filtered (_(" (main process)")); | |
504 | printf_filtered (_(" at ")); | |
5af949e3 | 505 | fputs_filtered (paddress (gdbarch, pc), gdb_stdout); |
ac264b3b MS |
506 | |
507 | sal = find_pc_line (pc, 0); | |
508 | if (sal.symtab) | |
509 | { | |
510 | char *tmp = strrchr (sal.symtab->filename, '/'); | |
511 | ||
512 | if (tmp) | |
513 | printf_filtered (_(", file %s"), tmp + 1); | |
514 | else | |
515 | printf_filtered (_(", file %s"), sal.symtab->filename); | |
516 | } | |
517 | if (sal.line) | |
518 | printf_filtered (_(", line %d"), sal.line); | |
519 | if (!sal.symtab && !sal.line) | |
520 | { | |
521 | struct minimal_symbol *msym; | |
522 | ||
523 | msym = lookup_minimal_symbol_by_pc (pc); | |
524 | if (msym) | |
525 | printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym)); | |
526 | } | |
527 | ||
528 | putchar_filtered ('\n'); | |
529 | } | |
b8db102d MS |
530 | if (printed == NULL) |
531 | { | |
532 | if (requested > 0) | |
2277426b | 533 | printf_filtered (_("No checkpoint number %d.\n"), requested); |
b8db102d | 534 | else |
2277426b | 535 | printf_filtered (_("No checkpoints.\n")); |
b8db102d | 536 | } |
ac264b3b MS |
537 | } |
538 | ||
2277426b PA |
539 | /* The PID of the process we're checkpointing. */ |
540 | static int checkpointing_pid = 0; | |
ac264b3b | 541 | |
2277426b PA |
542 | int |
543 | linux_fork_checkpointing_p (int pid) | |
ac264b3b | 544 | { |
2277426b | 545 | return (checkpointing_pid == pid); |
ac264b3b MS |
546 | } |
547 | ||
548 | static void | |
549 | checkpoint_command (char *args, int from_tty) | |
550 | { | |
3e3b026f UW |
551 | struct objfile *fork_objf; |
552 | struct gdbarch *gdbarch; | |
ac264b3b MS |
553 | struct target_waitstatus last_target_waitstatus; |
554 | ptid_t last_target_ptid; | |
555 | struct value *fork_fn = NULL, *ret; | |
556 | struct fork_info *fp; | |
557 | pid_t retpid; | |
558 | struct cleanup *old_chain; | |
559 | long i; | |
74960c60 | 560 | |
ac264b3b MS |
561 | /* Make the inferior fork, record its (and gdb's) state. */ |
562 | ||
563 | if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL) | |
3e3b026f | 564 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
565 | if (!fork_fn) |
566 | if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL) | |
3e3b026f | 567 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
568 | if (!fork_fn) |
569 | error (_("checkpoint: can't find fork function in inferior.")); | |
570 | ||
3e3b026f UW |
571 | gdbarch = get_objfile_arch (fork_objf); |
572 | ret = value_from_longest (builtin_type (gdbarch)->builtin_int, 0); | |
2277426b PA |
573 | |
574 | /* Tell linux-nat.c that we're checkpointing this inferior. */ | |
575 | old_chain = make_cleanup_restore_integer (&checkpointing_pid); | |
576 | checkpointing_pid = PIDGET (inferior_ptid); | |
577 | ||
ac264b3b MS |
578 | ret = call_function_by_hand (fork_fn, 0, &ret); |
579 | do_cleanups (old_chain); | |
580 | if (!ret) /* Probably can't happen. */ | |
581 | error (_("checkpoint: call_function_by_hand returned null.")); | |
582 | ||
583 | retpid = value_as_long (ret); | |
584 | get_last_target_status (&last_target_ptid, &last_target_waitstatus); | |
585 | if (from_tty) | |
586 | { | |
587 | int parent_pid; | |
588 | ||
589 | printf_filtered (_("checkpoint: fork returned pid %ld.\n"), | |
590 | (long) retpid); | |
591 | if (info_verbose) | |
592 | { | |
593 | parent_pid = ptid_get_lwp (last_target_ptid); | |
594 | if (parent_pid == 0) | |
595 | parent_pid = ptid_get_pid (last_target_ptid); | |
596 | printf_filtered (_(" gdb says parent = %ld.\n"), | |
597 | (long) parent_pid); | |
598 | } | |
599 | } | |
600 | ||
601 | fp = find_fork_pid (retpid); | |
602 | if (!fp) | |
603 | error (_("Failed to find new fork")); | |
604 | fork_save_infrun_state (fp, 1); | |
605 | } | |
606 | ||
607 | static void | |
608 | linux_fork_context (struct fork_info *newfp, int from_tty) | |
609 | { | |
610 | /* Now we attempt to switch processes. */ | |
0d14fc63 | 611 | struct fork_info *oldfp; |
ac264b3b MS |
612 | ptid_t ptid; |
613 | int id, i; | |
614 | ||
0d14fc63 | 615 | gdb_assert (newfp != NULL); |
ac264b3b | 616 | |
0d14fc63 PA |
617 | oldfp = find_fork_ptid (inferior_ptid); |
618 | gdb_assert (oldfp != NULL); | |
ac264b3b MS |
619 | |
620 | fork_save_infrun_state (oldfp, 1); | |
74960c60 | 621 | remove_breakpoints (); |
ac264b3b | 622 | fork_load_infrun_state (newfp); |
74960c60 | 623 | insert_breakpoints (); |
ac264b3b MS |
624 | |
625 | printf_filtered (_("Switching to %s\n"), | |
626 | target_pid_to_str (inferior_ptid)); | |
627 | ||
628 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
629 | } | |
630 | ||
2277426b | 631 | /* Switch inferior process (checkpoint) context, by checkpoint id. */ |
ac264b3b MS |
632 | static void |
633 | restart_command (char *args, int from_tty) | |
634 | { | |
635 | struct fork_info *fp; | |
636 | ||
637 | if (!args || !*args) | |
638 | error (_("Requires argument (checkpoint id to restart)")); | |
639 | ||
640 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
641 | error (_("Not found: checkpoint id %s"), args); | |
642 | ||
643 | linux_fork_context (fp, from_tty); | |
644 | } | |
645 | ||
646 | void | |
647 | _initialize_linux_fork (void) | |
648 | { | |
649 | init_fork_list (); | |
650 | ||
651 | /* Set/show detach-on-fork: user-settable mode. */ | |
652 | ||
653 | add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\ | |
654 | Set whether gdb will detach the child of a fork."), _("\ | |
655 | Show whether gdb will detach the child of a fork."), _("\ | |
656 | Tells gdb whether to detach the child of a fork."), | |
657 | NULL, NULL, &setlist, &showlist); | |
658 | ||
659 | /* Set/show restart-auto-finish: user-settable count. Causes the | |
660 | first "restart" of a fork to do some number of "finish" commands | |
661 | before returning to user. | |
662 | ||
663 | Useful because otherwise the virgin fork process will be stopped | |
664 | somewhere in the un-interesting fork system call. */ | |
665 | ||
666 | /* Checkpoint command: create a fork of the inferior process | |
667 | and set it aside for later debugging. */ | |
668 | ||
669 | add_com ("checkpoint", class_obscure, checkpoint_command, _("\ | |
670 | Fork a duplicate process (experimental).")); | |
671 | ||
2277426b PA |
672 | /* Restart command: restore the context of a specified checkpoint |
673 | process. */ | |
ac264b3b MS |
674 | |
675 | add_com ("restart", class_obscure, restart_command, _("\ | |
676 | restart <n>: restore program context from a checkpoint.\n\ | |
677 | Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'.")); | |
678 | ||
b8db102d | 679 | /* Delete checkpoint command: kill the process and remove it from |
ac264b3b MS |
680 | fork list. */ |
681 | ||
b8db102d | 682 | add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\ |
2277426b | 683 | Delete a checkpoint (experimental)."), |
b8db102d | 684 | &deletelist); |
ac264b3b | 685 | |
f73adfeb | 686 | /* Detach checkpoint command: release the process to run independently, |
ac264b3b MS |
687 | and remove it from the fork list. */ |
688 | ||
f73adfeb | 689 | add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\ |
2277426b | 690 | Detach from a checkpoint (experimental)."), |
f73adfeb | 691 | &detachlist); |
ac264b3b MS |
692 | |
693 | /* Info checkpoints command: list all forks/checkpoints | |
694 | currently under gdb's control. */ | |
695 | ||
696 | add_info ("checkpoints", info_forks_command, | |
2277426b | 697 | _("IDs of currently known checkpoints.")); |
ac264b3b | 698 | } |