Commit | Line | Data |
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ac264b3b MS |
1 | /* GNU/Linux native-dependent code for debugging multiple forks. |
2 | ||
4c38e0a4 JB |
3 | Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 |
4 | Free Software Foundation, Inc. | |
ac264b3b MS |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
ac264b3b MS |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ac264b3b MS |
20 | |
21 | #include "defs.h" | |
5af949e3 | 22 | #include "arch-utils.h" |
ac264b3b MS |
23 | #include "inferior.h" |
24 | #include "regcache.h" | |
25 | #include "gdbcmd.h" | |
26 | #include "infcall.h" | |
3e3b026f | 27 | #include "objfiles.h" |
791b663b | 28 | #include "gdb_assert.h" |
ac264b3b MS |
29 | #include "gdb_string.h" |
30 | #include "linux-fork.h" | |
f973ed9c | 31 | #include "linux-nat.h" |
ac264b3b MS |
32 | |
33 | #include <sys/ptrace.h> | |
3c61c145 | 34 | #include "gdb_wait.h" |
ac264b3b | 35 | #include <sys/param.h> |
91c06669 | 36 | #include "gdb_dirent.h" |
ac264b3b MS |
37 | #include <ctype.h> |
38 | ||
39 | struct fork_info *fork_list; | |
40 | static int highest_fork_num; | |
41 | ||
42 | /* Prevent warning from -Wmissing-prototypes. */ | |
43 | extern void _initialize_linux_fork (void); | |
44 | ||
ac264b3b MS |
45 | /* Fork list data structure: */ |
46 | struct fork_info | |
47 | { | |
48 | struct fork_info *next; | |
49 | ptid_t ptid; | |
50 | int num; /* Convenient handle (GDB fork id) */ | |
3cb5bea9 | 51 | struct regcache *savedregs; /* Convenient for info fork, saves |
ac264b3b MS |
52 | having to actually switch contexts. */ |
53 | int clobber_regs; /* True if we should restore saved regs. */ | |
ac264b3b MS |
54 | off_t *filepos; /* Set of open file descriptors' offsets. */ |
55 | int maxfd; | |
56 | }; | |
57 | ||
58 | /* Fork list methods: */ | |
59 | ||
3cb5bea9 | 60 | int |
ac264b3b MS |
61 | forks_exist_p (void) |
62 | { | |
63 | return (fork_list != NULL); | |
64 | } | |
65 | ||
3cb5bea9 | 66 | /* Add a fork to the internal fork list. */ |
ac264b3b | 67 | |
3cb5bea9 | 68 | struct fork_info * |
ac264b3b MS |
69 | add_fork (pid_t pid) |
70 | { | |
71 | struct fork_info *fp; | |
72 | ||
56aac7e8 | 73 | if (fork_list == NULL && pid != PIDGET (inferior_ptid)) |
ac264b3b MS |
74 | { |
75 | /* Special case -- if this is the first fork in the list | |
76 | (the list is hitherto empty), and if this new fork is | |
77 | NOT the current inferior_ptid, then add inferior_ptid | |
78 | first, as a special zeroeth fork id. */ | |
79 | highest_fork_num = -1; | |
80 | add_fork (PIDGET (inferior_ptid)); /* safe recursion */ | |
81 | } | |
82 | ||
83 | fp = XZALLOC (struct fork_info); | |
f973ed9c | 84 | fp->ptid = ptid_build (pid, pid, 0); |
ac264b3b MS |
85 | fp->num = ++highest_fork_num; |
86 | fp->next = fork_list; | |
87 | fork_list = fp; | |
88 | return fp; | |
89 | } | |
90 | ||
91 | static void | |
92 | free_fork (struct fork_info *fp) | |
93 | { | |
94 | /* Notes on step-resume breakpoints: since this is a concern for | |
95 | threads, let's convince ourselves that it's not a concern for | |
96 | forks. There are two ways for a fork_info to be created. First, | |
97 | by the checkpoint command, in which case we're at a gdb prompt | |
98 | and there can't be any step-resume breakpoint. Second, by a fork | |
99 | in the user program, in which case we *may* have stepped into the | |
100 | fork call, but regardless of whether we follow the parent or the | |
101 | child, we will return to the same place and the step-resume | |
102 | breakpoint, if any, will take care of itself as usual. And | |
103 | unlike threads, we do not save a private copy of the step-resume | |
104 | breakpoint -- so we're OK. */ | |
105 | ||
106 | if (fp) | |
107 | { | |
108 | if (fp->savedregs) | |
109 | regcache_xfree (fp->savedregs); | |
110 | if (fp->filepos) | |
111 | xfree (fp->filepos); | |
112 | xfree (fp); | |
113 | } | |
114 | } | |
115 | ||
116 | static void | |
117 | delete_fork (ptid_t ptid) | |
118 | { | |
119 | struct fork_info *fp, *fpprev; | |
120 | ||
121 | fpprev = NULL; | |
122 | ||
123 | for (fp = fork_list; fp; fpprev = fp, fp = fp->next) | |
124 | if (ptid_equal (fp->ptid, ptid)) | |
125 | break; | |
126 | ||
127 | if (!fp) | |
128 | return; | |
129 | ||
130 | if (fpprev) | |
131 | fpprev->next = fp->next; | |
132 | else | |
133 | fork_list = fp->next; | |
134 | ||
135 | free_fork (fp); | |
136 | ||
3cb5bea9 | 137 | /* Special case: if there is now only one process in the list, |
ac264b3b MS |
138 | and if it is (hopefully!) the current inferior_ptid, then |
139 | remove it, leaving the list empty -- we're now down to the | |
140 | default case of debugging a single process. */ | |
141 | if (fork_list != NULL && fork_list->next == NULL && | |
142 | ptid_equal (fork_list->ptid, inferior_ptid)) | |
143 | { | |
144 | /* Last fork -- delete from list and handle as solo process | |
145 | (should be a safe recursion). */ | |
146 | delete_fork (inferior_ptid); | |
147 | } | |
148 | } | |
149 | ||
150 | /* Find a fork_info by matching PTID. */ | |
151 | static struct fork_info * | |
152 | find_fork_ptid (ptid_t ptid) | |
153 | { | |
154 | struct fork_info *fp; | |
155 | ||
156 | for (fp = fork_list; fp; fp = fp->next) | |
157 | if (ptid_equal (fp->ptid, ptid)) | |
158 | return fp; | |
159 | ||
160 | return NULL; | |
161 | } | |
162 | ||
163 | /* Find a fork_info by matching ID. */ | |
164 | static struct fork_info * | |
165 | find_fork_id (int num) | |
166 | { | |
167 | struct fork_info *fp; | |
168 | ||
169 | for (fp = fork_list; fp; fp = fp->next) | |
170 | if (fp->num == num) | |
171 | return fp; | |
172 | ||
173 | return NULL; | |
174 | } | |
175 | ||
176 | /* Find a fork_info by matching pid. */ | |
177 | extern struct fork_info * | |
178 | find_fork_pid (pid_t pid) | |
179 | { | |
180 | struct fork_info *fp; | |
181 | ||
182 | for (fp = fork_list; fp; fp = fp->next) | |
183 | if (pid == ptid_get_pid (fp->ptid)) | |
184 | return fp; | |
185 | ||
186 | return NULL; | |
187 | } | |
188 | ||
189 | static ptid_t | |
190 | fork_id_to_ptid (int num) | |
191 | { | |
192 | struct fork_info *fork = find_fork_id (num); | |
193 | if (fork) | |
194 | return fork->ptid; | |
195 | else | |
196 | return pid_to_ptid (-1); | |
197 | } | |
198 | ||
199 | static void | |
200 | init_fork_list (void) | |
201 | { | |
202 | struct fork_info *fp, *fpnext; | |
203 | ||
204 | if (!fork_list) | |
205 | return; | |
206 | ||
207 | for (fp = fork_list; fp; fp = fpnext) | |
208 | { | |
209 | fpnext = fp->next; | |
210 | free_fork (fp); | |
211 | } | |
212 | ||
213 | fork_list = NULL; | |
214 | } | |
215 | ||
216 | /* Fork list <-> gdb interface. */ | |
217 | ||
3cb5bea9 | 218 | /* Utility function for fork_load/fork_save. |
ac264b3b MS |
219 | Calls lseek in the (current) inferior process. */ |
220 | ||
221 | static off_t | |
222 | call_lseek (int fd, off_t offset, int whence) | |
223 | { | |
224 | char exp[80]; | |
225 | ||
226 | snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)", | |
227 | fd, (long) offset, whence); | |
228 | return (off_t) parse_and_eval_long (&exp[0]); | |
229 | } | |
230 | ||
231 | /* Load infrun state for the fork PTID. */ | |
232 | ||
233 | static void | |
234 | fork_load_infrun_state (struct fork_info *fp) | |
235 | { | |
236 | extern void nullify_last_target_wait_ptid (); | |
237 | int i; | |
238 | ||
2277426b | 239 | linux_nat_switch_fork (fp->ptid); |
f973ed9c | 240 | |
ac264b3b | 241 | if (fp->savedregs && fp->clobber_regs) |
594f7785 | 242 | regcache_cpy (get_current_regcache (), fp->savedregs); |
ac264b3b | 243 | |
791b663b DJ |
244 | registers_changed (); |
245 | reinit_frame_cache (); | |
246 | ||
fb14de7b | 247 | stop_pc = regcache_read_pc (get_current_regcache ()); |
ac264b3b MS |
248 | nullify_last_target_wait_ptid (); |
249 | ||
250 | /* Now restore the file positions of open file descriptors. */ | |
251 | if (fp->filepos) | |
252 | { | |
253 | for (i = 0; i <= fp->maxfd; i++) | |
254 | if (fp->filepos[i] != (off_t) -1) | |
255 | call_lseek (i, fp->filepos[i], SEEK_SET); | |
256 | /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because | |
257 | this is native-only. If it ever has to be cross, we'll have | |
258 | to rethink this. */ | |
259 | } | |
260 | } | |
261 | ||
262 | /* Save infrun state for the fork PTID. | |
263 | Exported for use by linux child_follow_fork. */ | |
264 | ||
2277426b | 265 | static void |
ac264b3b MS |
266 | fork_save_infrun_state (struct fork_info *fp, int clobber_regs) |
267 | { | |
268 | char path[MAXPATHLEN]; | |
269 | struct dirent *de; | |
270 | DIR *d; | |
271 | ||
272 | if (fp->savedregs) | |
273 | regcache_xfree (fp->savedregs); | |
274 | ||
594f7785 | 275 | fp->savedregs = regcache_dup (get_current_regcache ()); |
ac264b3b | 276 | fp->clobber_regs = clobber_regs; |
ac264b3b MS |
277 | |
278 | if (clobber_regs) | |
279 | { | |
280 | /* Now save the 'state' (file position) of all open file descriptors. | |
281 | Unfortunately fork does not take care of that for us... */ | |
282 | snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid)); | |
283 | if ((d = opendir (path)) != NULL) | |
284 | { | |
285 | long tmp; | |
286 | ||
287 | fp->maxfd = 0; | |
288 | while ((de = readdir (d)) != NULL) | |
289 | { | |
290 | /* Count open file descriptors (actually find highest | |
291 | numbered). */ | |
292 | tmp = strtol (&de->d_name[0], NULL, 10); | |
293 | if (fp->maxfd < tmp) | |
294 | fp->maxfd = tmp; | |
295 | } | |
296 | /* Allocate array of file positions. */ | |
3cb5bea9 | 297 | fp->filepos = xrealloc (fp->filepos, |
ac264b3b MS |
298 | (fp->maxfd + 1) * sizeof (*fp->filepos)); |
299 | ||
300 | /* Initialize to -1 (invalid). */ | |
301 | for (tmp = 0; tmp <= fp->maxfd; tmp++) | |
302 | fp->filepos[tmp] = -1; | |
303 | ||
304 | /* Now find actual file positions. */ | |
305 | rewinddir (d); | |
306 | while ((de = readdir (d)) != NULL) | |
307 | if (isdigit (de->d_name[0])) | |
308 | { | |
309 | tmp = strtol (&de->d_name[0], NULL, 10); | |
310 | fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR); | |
311 | } | |
312 | closedir (d); | |
313 | } | |
314 | } | |
315 | } | |
316 | ||
317 | /* Kill 'em all, let God sort 'em out... */ | |
318 | ||
3cb5bea9 | 319 | void |
ac264b3b MS |
320 | linux_fork_killall (void) |
321 | { | |
322 | /* Walk list and kill every pid. No need to treat the | |
323 | current inferior_ptid as special (we do not return a | |
324 | status for it) -- however any process may be a child | |
325 | or a parent, so may get a SIGCHLD from a previously | |
326 | killed child. Wait them all out. */ | |
56aac7e8 | 327 | struct fork_info *fp; |
ac264b3b MS |
328 | pid_t pid, ret; |
329 | int status; | |
330 | ||
56aac7e8 MS |
331 | for (fp = fork_list; fp; fp = fp->next) |
332 | { | |
333 | pid = PIDGET (fp->ptid); | |
334 | do { | |
4c28f408 PA |
335 | /* Use SIGKILL instead of PTRACE_KILL because the former works even |
336 | if the thread is running, while the later doesn't. */ | |
337 | kill (pid, SIGKILL); | |
56aac7e8 MS |
338 | ret = waitpid (pid, &status, 0); |
339 | /* We might get a SIGCHLD instead of an exit status. This is | |
340 | aggravated by the first kill above - a child has just | |
341 | died. MVS comment cut-and-pasted from linux-nat. */ | |
342 | } while (ret == pid && WIFSTOPPED (status)); | |
343 | } | |
344 | init_fork_list (); /* Clear list, prepare to start fresh. */ | |
ac264b3b MS |
345 | } |
346 | ||
347 | /* The current inferior_ptid has exited, but there are other viable | |
348 | forks to debug. Delete the exiting one and context-switch to the | |
349 | first available. */ | |
350 | ||
3cb5bea9 | 351 | void |
ac264b3b MS |
352 | linux_fork_mourn_inferior (void) |
353 | { | |
354 | /* Wait just one more time to collect the inferior's exit status. | |
355 | Do not check whether this succeeds though, since we may be | |
356 | dealing with a process that we attached to. Such a process will | |
357 | only report its exit status to its original parent. */ | |
358 | int status; | |
359 | ||
360 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); | |
361 | ||
362 | /* OK, presumably inferior_ptid is the one who has exited. | |
363 | We need to delete that one from the fork_list, and switch | |
364 | to the next available fork. */ | |
365 | delete_fork (inferior_ptid); | |
791b663b DJ |
366 | |
367 | /* There should still be a fork - if there's only one left, | |
368 | delete_fork won't remove it, because we haven't updated | |
369 | inferior_ptid yet. */ | |
370 | gdb_assert (fork_list); | |
371 | ||
372 | fork_load_infrun_state (fork_list); | |
373 | printf_filtered (_("[Switching to %s]\n"), | |
374 | target_pid_to_str (inferior_ptid)); | |
375 | ||
376 | /* If there's only one fork, switch back to non-fork mode. */ | |
377 | if (fork_list->next == NULL) | |
378 | delete_fork (inferior_ptid); | |
ac264b3b MS |
379 | } |
380 | ||
7a7d3353 PA |
381 | /* The current inferior_ptid is being detached, but there are other |
382 | viable forks to debug. Detach and delete it and context-switch to | |
383 | the first available. */ | |
384 | ||
3cb5bea9 | 385 | void |
7a7d3353 PA |
386 | linux_fork_detach (char *args, int from_tty) |
387 | { | |
388 | /* OK, inferior_ptid is the one we are detaching from. We need to | |
389 | delete it from the fork_list, and switch to the next available | |
390 | fork. */ | |
391 | ||
392 | if (ptrace (PTRACE_DETACH, PIDGET (inferior_ptid), 0, 0)) | |
393 | error (_("Unable to detach %s"), target_pid_to_str (inferior_ptid)); | |
394 | ||
395 | delete_fork (inferior_ptid); | |
7a7d3353 PA |
396 | |
397 | /* There should still be a fork - if there's only one left, | |
398 | delete_fork won't remove it, because we haven't updated | |
399 | inferior_ptid yet. */ | |
400 | gdb_assert (fork_list); | |
401 | ||
402 | fork_load_infrun_state (fork_list); | |
403 | ||
404 | if (from_tty) | |
405 | printf_filtered (_("[Switching to %s]\n"), | |
406 | target_pid_to_str (inferior_ptid)); | |
407 | ||
408 | /* If there's only one fork, switch back to non-fork mode. */ | |
409 | if (fork_list->next == NULL) | |
410 | delete_fork (inferior_ptid); | |
411 | } | |
412 | ||
ac264b3b MS |
413 | /* Fork list <-> user interface. */ |
414 | ||
415 | static void | |
3cb5bea9 | 416 | delete_checkpoint_command (char *args, int from_tty) |
ac264b3b MS |
417 | { |
418 | ptid_t ptid; | |
419 | ||
420 | if (!args || !*args) | |
2277426b | 421 | error (_("Requires argument (checkpoint id to delete)")); |
ac264b3b MS |
422 | |
423 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
424 | if (ptid_equal (ptid, minus_one_ptid)) | |
2277426b | 425 | error (_("No such checkpoint id, %s"), args); |
ac264b3b MS |
426 | |
427 | if (ptid_equal (ptid, inferior_ptid)) | |
3cb5bea9 PA |
428 | error (_("\ |
429 | Please switch to another checkpoint before deleting the current one")); | |
ac264b3b | 430 | |
1dce6535 | 431 | if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0)) |
54ba13f7 | 432 | error (_("Unable to kill pid %s"), target_pid_to_str (ptid)); |
ac264b3b MS |
433 | |
434 | if (from_tty) | |
435 | printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid)); | |
436 | ||
437 | delete_fork (ptid); | |
438 | } | |
439 | ||
440 | static void | |
3cb5bea9 | 441 | detach_checkpoint_command (char *args, int from_tty) |
ac264b3b MS |
442 | { |
443 | ptid_t ptid; | |
444 | ||
445 | if (!args || !*args) | |
2277426b | 446 | error (_("Requires argument (checkpoint id to detach)")); |
ac264b3b MS |
447 | |
448 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
449 | if (ptid_equal (ptid, minus_one_ptid)) | |
2277426b | 450 | error (_("No such checkpoint id, %s"), args); |
ac264b3b MS |
451 | |
452 | if (ptid_equal (ptid, inferior_ptid)) | |
2277426b PA |
453 | error (_("\ |
454 | Please switch to another checkpoint before detaching the current one")); | |
ac264b3b | 455 | |
1dce6535 | 456 | if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0)) |
ac264b3b MS |
457 | error (_("Unable to detach %s"), target_pid_to_str (ptid)); |
458 | ||
459 | if (from_tty) | |
460 | printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid)); | |
461 | ||
462 | delete_fork (ptid); | |
463 | } | |
464 | ||
3cb5bea9 | 465 | /* Print information about currently known checkpoints. */ |
ac264b3b MS |
466 | |
467 | static void | |
3cb5bea9 | 468 | info_checkpoints_command (char *arg, int from_tty) |
ac264b3b | 469 | { |
5af949e3 | 470 | struct gdbarch *gdbarch = get_current_arch (); |
ac264b3b MS |
471 | struct frame_info *cur_frame; |
472 | struct symtab_and_line sal; | |
473 | struct symtab *cur_symtab; | |
474 | struct fork_info *fp; | |
475 | int cur_line; | |
476 | ULONGEST pc; | |
b8db102d MS |
477 | int requested = -1; |
478 | struct fork_info *printed = NULL; | |
479 | ||
480 | if (arg && *arg) | |
481 | requested = (int) parse_and_eval_long (arg); | |
ac264b3b MS |
482 | |
483 | for (fp = fork_list; fp; fp = fp->next) | |
484 | { | |
b8db102d MS |
485 | if (requested > 0 && fp->num != requested) |
486 | continue; | |
487 | ||
488 | printed = fp; | |
ac264b3b MS |
489 | if (ptid_equal (fp->ptid, inferior_ptid)) |
490 | { | |
491 | printf_filtered ("* "); | |
fb14de7b | 492 | pc = regcache_read_pc (get_current_regcache ()); |
ac264b3b MS |
493 | } |
494 | else | |
495 | { | |
496 | printf_filtered (" "); | |
2277426b | 497 | pc = regcache_read_pc (fp->savedregs); |
ac264b3b MS |
498 | } |
499 | printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid)); | |
500 | if (fp->num == 0) | |
501 | printf_filtered (_(" (main process)")); | |
502 | printf_filtered (_(" at ")); | |
5af949e3 | 503 | fputs_filtered (paddress (gdbarch, pc), gdb_stdout); |
ac264b3b MS |
504 | |
505 | sal = find_pc_line (pc, 0); | |
506 | if (sal.symtab) | |
507 | { | |
508 | char *tmp = strrchr (sal.symtab->filename, '/'); | |
509 | ||
510 | if (tmp) | |
511 | printf_filtered (_(", file %s"), tmp + 1); | |
512 | else | |
513 | printf_filtered (_(", file %s"), sal.symtab->filename); | |
514 | } | |
515 | if (sal.line) | |
516 | printf_filtered (_(", line %d"), sal.line); | |
517 | if (!sal.symtab && !sal.line) | |
518 | { | |
519 | struct minimal_symbol *msym; | |
520 | ||
521 | msym = lookup_minimal_symbol_by_pc (pc); | |
522 | if (msym) | |
523 | printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym)); | |
524 | } | |
525 | ||
526 | putchar_filtered ('\n'); | |
527 | } | |
b8db102d MS |
528 | if (printed == NULL) |
529 | { | |
530 | if (requested > 0) | |
2277426b | 531 | printf_filtered (_("No checkpoint number %d.\n"), requested); |
b8db102d | 532 | else |
2277426b | 533 | printf_filtered (_("No checkpoints.\n")); |
b8db102d | 534 | } |
ac264b3b MS |
535 | } |
536 | ||
2277426b PA |
537 | /* The PID of the process we're checkpointing. */ |
538 | static int checkpointing_pid = 0; | |
ac264b3b | 539 | |
2277426b PA |
540 | int |
541 | linux_fork_checkpointing_p (int pid) | |
ac264b3b | 542 | { |
2277426b | 543 | return (checkpointing_pid == pid); |
ac264b3b MS |
544 | } |
545 | ||
546 | static void | |
547 | checkpoint_command (char *args, int from_tty) | |
548 | { | |
3e3b026f UW |
549 | struct objfile *fork_objf; |
550 | struct gdbarch *gdbarch; | |
ac264b3b MS |
551 | struct target_waitstatus last_target_waitstatus; |
552 | ptid_t last_target_ptid; | |
553 | struct value *fork_fn = NULL, *ret; | |
554 | struct fork_info *fp; | |
555 | pid_t retpid; | |
556 | struct cleanup *old_chain; | |
557 | long i; | |
74960c60 | 558 | |
ac264b3b MS |
559 | /* Make the inferior fork, record its (and gdb's) state. */ |
560 | ||
561 | if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL) | |
3e3b026f | 562 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
563 | if (!fork_fn) |
564 | if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL) | |
3e3b026f | 565 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
566 | if (!fork_fn) |
567 | error (_("checkpoint: can't find fork function in inferior.")); | |
568 | ||
3e3b026f UW |
569 | gdbarch = get_objfile_arch (fork_objf); |
570 | ret = value_from_longest (builtin_type (gdbarch)->builtin_int, 0); | |
2277426b PA |
571 | |
572 | /* Tell linux-nat.c that we're checkpointing this inferior. */ | |
573 | old_chain = make_cleanup_restore_integer (&checkpointing_pid); | |
574 | checkpointing_pid = PIDGET (inferior_ptid); | |
575 | ||
ac264b3b MS |
576 | ret = call_function_by_hand (fork_fn, 0, &ret); |
577 | do_cleanups (old_chain); | |
578 | if (!ret) /* Probably can't happen. */ | |
579 | error (_("checkpoint: call_function_by_hand returned null.")); | |
580 | ||
581 | retpid = value_as_long (ret); | |
582 | get_last_target_status (&last_target_ptid, &last_target_waitstatus); | |
583 | if (from_tty) | |
584 | { | |
585 | int parent_pid; | |
586 | ||
3cb5bea9 | 587 | printf_filtered (_("checkpoint: fork returned pid %ld.\n"), |
ac264b3b MS |
588 | (long) retpid); |
589 | if (info_verbose) | |
590 | { | |
591 | parent_pid = ptid_get_lwp (last_target_ptid); | |
592 | if (parent_pid == 0) | |
593 | parent_pid = ptid_get_pid (last_target_ptid); | |
3cb5bea9 | 594 | printf_filtered (_(" gdb says parent = %ld.\n"), |
ac264b3b MS |
595 | (long) parent_pid); |
596 | } | |
597 | } | |
598 | ||
599 | fp = find_fork_pid (retpid); | |
600 | if (!fp) | |
601 | error (_("Failed to find new fork")); | |
602 | fork_save_infrun_state (fp, 1); | |
603 | } | |
604 | ||
605 | static void | |
606 | linux_fork_context (struct fork_info *newfp, int from_tty) | |
607 | { | |
608 | /* Now we attempt to switch processes. */ | |
0d14fc63 | 609 | struct fork_info *oldfp; |
ac264b3b MS |
610 | ptid_t ptid; |
611 | int id, i; | |
612 | ||
0d14fc63 | 613 | gdb_assert (newfp != NULL); |
ac264b3b | 614 | |
0d14fc63 PA |
615 | oldfp = find_fork_ptid (inferior_ptid); |
616 | gdb_assert (oldfp != NULL); | |
ac264b3b MS |
617 | |
618 | fork_save_infrun_state (oldfp, 1); | |
74960c60 | 619 | remove_breakpoints (); |
ac264b3b | 620 | fork_load_infrun_state (newfp); |
74960c60 | 621 | insert_breakpoints (); |
ac264b3b | 622 | |
3cb5bea9 | 623 | printf_filtered (_("Switching to %s\n"), |
ac264b3b MS |
624 | target_pid_to_str (inferior_ptid)); |
625 | ||
626 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
627 | } | |
628 | ||
2277426b | 629 | /* Switch inferior process (checkpoint) context, by checkpoint id. */ |
ac264b3b MS |
630 | static void |
631 | restart_command (char *args, int from_tty) | |
632 | { | |
633 | struct fork_info *fp; | |
634 | ||
635 | if (!args || !*args) | |
636 | error (_("Requires argument (checkpoint id to restart)")); | |
637 | ||
638 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
639 | error (_("Not found: checkpoint id %s"), args); | |
640 | ||
641 | linux_fork_context (fp, from_tty); | |
642 | } | |
643 | ||
644 | void | |
645 | _initialize_linux_fork (void) | |
646 | { | |
647 | init_fork_list (); | |
648 | ||
ac264b3b MS |
649 | /* Checkpoint command: create a fork of the inferior process |
650 | and set it aside for later debugging. */ | |
651 | ||
652 | add_com ("checkpoint", class_obscure, checkpoint_command, _("\ | |
653 | Fork a duplicate process (experimental).")); | |
654 | ||
2277426b PA |
655 | /* Restart command: restore the context of a specified checkpoint |
656 | process. */ | |
ac264b3b MS |
657 | |
658 | add_com ("restart", class_obscure, restart_command, _("\ | |
659 | restart <n>: restore program context from a checkpoint.\n\ | |
660 | Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'.")); | |
661 | ||
b8db102d | 662 | /* Delete checkpoint command: kill the process and remove it from |
3cb5bea9 | 663 | the fork list. */ |
ac264b3b | 664 | |
3cb5bea9 | 665 | add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\ |
2277426b | 666 | Delete a checkpoint (experimental)."), |
b8db102d | 667 | &deletelist); |
ac264b3b | 668 | |
3cb5bea9 | 669 | /* Detach checkpoint command: release the process to run independently, |
ac264b3b MS |
670 | and remove it from the fork list. */ |
671 | ||
3cb5bea9 | 672 | add_cmd ("checkpoint", class_obscure, detach_checkpoint_command, _("\ |
2277426b | 673 | Detach from a checkpoint (experimental)."), |
f73adfeb | 674 | &detachlist); |
ac264b3b | 675 | |
3cb5bea9 | 676 | /* Info checkpoints command: list all forks/checkpoints |
ac264b3b MS |
677 | currently under gdb's control. */ |
678 | ||
3cb5bea9 | 679 | add_info ("checkpoints", info_checkpoints_command, |
2277426b | 680 | _("IDs of currently known checkpoints.")); |
ac264b3b | 681 | } |