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) */ | |
3cb5bea9 | 53 | struct regcache *savedregs; /* Convenient for info fork, saves |
ac264b3b MS |
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 | ||
3cb5bea9 | 62 | int |
ac264b3b MS |
63 | forks_exist_p (void) |
64 | { | |
65 | return (fork_list != NULL); | |
66 | } | |
67 | ||
3cb5bea9 | 68 | /* Add a fork to the internal fork list. */ |
ac264b3b | 69 | |
3cb5bea9 | 70 | struct fork_info * |
ac264b3b MS |
71 | add_fork (pid_t pid) |
72 | { | |
73 | struct fork_info *fp; | |
74 | ||
56aac7e8 | 75 | if (fork_list == NULL && pid != PIDGET (inferior_ptid)) |
ac264b3b MS |
76 | { |
77 | /* Special case -- if this is the first fork in the list | |
78 | (the list is hitherto empty), and if this new fork is | |
79 | NOT the current inferior_ptid, then add inferior_ptid | |
80 | first, as a special zeroeth fork id. */ | |
81 | highest_fork_num = -1; | |
82 | add_fork (PIDGET (inferior_ptid)); /* safe recursion */ | |
83 | } | |
84 | ||
85 | fp = XZALLOC (struct fork_info); | |
f973ed9c | 86 | fp->ptid = ptid_build (pid, pid, 0); |
ac264b3b MS |
87 | fp->num = ++highest_fork_num; |
88 | fp->next = fork_list; | |
89 | fork_list = fp; | |
90 | return fp; | |
91 | } | |
92 | ||
93 | static void | |
94 | free_fork (struct fork_info *fp) | |
95 | { | |
96 | /* Notes on step-resume breakpoints: since this is a concern for | |
97 | threads, let's convince ourselves that it's not a concern for | |
98 | forks. There are two ways for a fork_info to be created. First, | |
99 | by the checkpoint command, in which case we're at a gdb prompt | |
100 | and there can't be any step-resume breakpoint. Second, by a fork | |
101 | in the user program, in which case we *may* have stepped into the | |
102 | fork call, but regardless of whether we follow the parent or the | |
103 | child, we will return to the same place and the step-resume | |
104 | breakpoint, if any, will take care of itself as usual. And | |
105 | unlike threads, we do not save a private copy of the step-resume | |
106 | breakpoint -- so we're OK. */ | |
107 | ||
108 | if (fp) | |
109 | { | |
110 | if (fp->savedregs) | |
111 | regcache_xfree (fp->savedregs); | |
112 | if (fp->filepos) | |
113 | xfree (fp->filepos); | |
114 | xfree (fp); | |
115 | } | |
116 | } | |
117 | ||
118 | static void | |
119 | delete_fork (ptid_t ptid) | |
120 | { | |
121 | struct fork_info *fp, *fpprev; | |
122 | ||
123 | fpprev = NULL; | |
124 | ||
125 | for (fp = fork_list; fp; fpprev = fp, fp = fp->next) | |
126 | if (ptid_equal (fp->ptid, ptid)) | |
127 | break; | |
128 | ||
129 | if (!fp) | |
130 | return; | |
131 | ||
132 | if (fpprev) | |
133 | fpprev->next = fp->next; | |
134 | else | |
135 | fork_list = fp->next; | |
136 | ||
137 | free_fork (fp); | |
138 | ||
3cb5bea9 | 139 | /* Special case: if there is now only one process in the list, |
ac264b3b MS |
140 | and if it is (hopefully!) the current inferior_ptid, then |
141 | remove it, leaving the list empty -- we're now down to the | |
142 | default case of debugging a single process. */ | |
143 | if (fork_list != NULL && fork_list->next == NULL && | |
144 | ptid_equal (fork_list->ptid, inferior_ptid)) | |
145 | { | |
146 | /* Last fork -- delete from list and handle as solo process | |
147 | (should be a safe recursion). */ | |
148 | delete_fork (inferior_ptid); | |
149 | } | |
150 | } | |
151 | ||
152 | /* Find a fork_info by matching PTID. */ | |
153 | static struct fork_info * | |
154 | find_fork_ptid (ptid_t ptid) | |
155 | { | |
156 | struct fork_info *fp; | |
157 | ||
158 | for (fp = fork_list; fp; fp = fp->next) | |
159 | if (ptid_equal (fp->ptid, ptid)) | |
160 | return fp; | |
161 | ||
162 | return NULL; | |
163 | } | |
164 | ||
165 | /* Find a fork_info by matching ID. */ | |
166 | static struct fork_info * | |
167 | find_fork_id (int num) | |
168 | { | |
169 | struct fork_info *fp; | |
170 | ||
171 | for (fp = fork_list; fp; fp = fp->next) | |
172 | if (fp->num == num) | |
173 | return fp; | |
174 | ||
175 | return NULL; | |
176 | } | |
177 | ||
178 | /* Find a fork_info by matching pid. */ | |
179 | extern struct fork_info * | |
180 | find_fork_pid (pid_t pid) | |
181 | { | |
182 | struct fork_info *fp; | |
183 | ||
184 | for (fp = fork_list; fp; fp = fp->next) | |
185 | if (pid == ptid_get_pid (fp->ptid)) | |
186 | return fp; | |
187 | ||
188 | return NULL; | |
189 | } | |
190 | ||
191 | static ptid_t | |
192 | fork_id_to_ptid (int num) | |
193 | { | |
194 | struct fork_info *fork = find_fork_id (num); | |
195 | if (fork) | |
196 | return fork->ptid; | |
197 | else | |
198 | return pid_to_ptid (-1); | |
199 | } | |
200 | ||
201 | static void | |
202 | init_fork_list (void) | |
203 | { | |
204 | struct fork_info *fp, *fpnext; | |
205 | ||
206 | if (!fork_list) | |
207 | return; | |
208 | ||
209 | for (fp = fork_list; fp; fp = fpnext) | |
210 | { | |
211 | fpnext = fp->next; | |
212 | free_fork (fp); | |
213 | } | |
214 | ||
215 | fork_list = NULL; | |
216 | } | |
217 | ||
218 | /* Fork list <-> gdb interface. */ | |
219 | ||
3cb5bea9 | 220 | /* Utility function for fork_load/fork_save. |
ac264b3b MS |
221 | Calls lseek in the (current) inferior process. */ |
222 | ||
223 | static off_t | |
224 | call_lseek (int fd, off_t offset, int whence) | |
225 | { | |
226 | char exp[80]; | |
227 | ||
228 | snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)", | |
229 | fd, (long) offset, whence); | |
230 | return (off_t) parse_and_eval_long (&exp[0]); | |
231 | } | |
232 | ||
233 | /* Load infrun state for the fork PTID. */ | |
234 | ||
235 | static void | |
236 | fork_load_infrun_state (struct fork_info *fp) | |
237 | { | |
238 | extern void nullify_last_target_wait_ptid (); | |
239 | int i; | |
240 | ||
2277426b | 241 | linux_nat_switch_fork (fp->ptid); |
f973ed9c | 242 | |
ac264b3b | 243 | if (fp->savedregs && fp->clobber_regs) |
594f7785 | 244 | regcache_cpy (get_current_regcache (), fp->savedregs); |
ac264b3b | 245 | |
791b663b DJ |
246 | registers_changed (); |
247 | reinit_frame_cache (); | |
248 | ||
fb14de7b | 249 | stop_pc = regcache_read_pc (get_current_regcache ()); |
ac264b3b MS |
250 | nullify_last_target_wait_ptid (); |
251 | ||
252 | /* Now restore the file positions of open file descriptors. */ | |
253 | if (fp->filepos) | |
254 | { | |
255 | for (i = 0; i <= fp->maxfd; i++) | |
256 | if (fp->filepos[i] != (off_t) -1) | |
257 | call_lseek (i, fp->filepos[i], SEEK_SET); | |
258 | /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because | |
259 | this is native-only. If it ever has to be cross, we'll have | |
260 | to rethink this. */ | |
261 | } | |
262 | } | |
263 | ||
264 | /* Save infrun state for the fork PTID. | |
265 | Exported for use by linux child_follow_fork. */ | |
266 | ||
2277426b | 267 | static void |
ac264b3b MS |
268 | fork_save_infrun_state (struct fork_info *fp, int clobber_regs) |
269 | { | |
270 | char path[MAXPATHLEN]; | |
271 | struct dirent *de; | |
272 | DIR *d; | |
273 | ||
274 | if (fp->savedregs) | |
275 | regcache_xfree (fp->savedregs); | |
276 | ||
594f7785 | 277 | fp->savedregs = regcache_dup (get_current_regcache ()); |
ac264b3b | 278 | fp->clobber_regs = clobber_regs; |
ac264b3b MS |
279 | |
280 | if (clobber_regs) | |
281 | { | |
282 | /* Now save the 'state' (file position) of all open file descriptors. | |
283 | Unfortunately fork does not take care of that for us... */ | |
284 | snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid)); | |
285 | if ((d = opendir (path)) != NULL) | |
286 | { | |
287 | long tmp; | |
288 | ||
289 | fp->maxfd = 0; | |
290 | while ((de = readdir (d)) != NULL) | |
291 | { | |
292 | /* Count open file descriptors (actually find highest | |
293 | numbered). */ | |
294 | tmp = strtol (&de->d_name[0], NULL, 10); | |
295 | if (fp->maxfd < tmp) | |
296 | fp->maxfd = tmp; | |
297 | } | |
298 | /* Allocate array of file positions. */ | |
3cb5bea9 | 299 | fp->filepos = xrealloc (fp->filepos, |
ac264b3b MS |
300 | (fp->maxfd + 1) * sizeof (*fp->filepos)); |
301 | ||
302 | /* Initialize to -1 (invalid). */ | |
303 | for (tmp = 0; tmp <= fp->maxfd; tmp++) | |
304 | fp->filepos[tmp] = -1; | |
305 | ||
306 | /* Now find actual file positions. */ | |
307 | rewinddir (d); | |
308 | while ((de = readdir (d)) != NULL) | |
309 | if (isdigit (de->d_name[0])) | |
310 | { | |
311 | tmp = strtol (&de->d_name[0], NULL, 10); | |
312 | fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR); | |
313 | } | |
314 | closedir (d); | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
319 | /* Kill 'em all, let God sort 'em out... */ | |
320 | ||
3cb5bea9 | 321 | void |
ac264b3b MS |
322 | linux_fork_killall (void) |
323 | { | |
324 | /* Walk list and kill every pid. No need to treat the | |
325 | current inferior_ptid as special (we do not return a | |
326 | status for it) -- however any process may be a child | |
327 | or a parent, so may get a SIGCHLD from a previously | |
328 | killed child. Wait them all out. */ | |
56aac7e8 | 329 | struct fork_info *fp; |
ac264b3b MS |
330 | pid_t pid, ret; |
331 | int status; | |
332 | ||
56aac7e8 MS |
333 | for (fp = fork_list; fp; fp = fp->next) |
334 | { | |
335 | pid = PIDGET (fp->ptid); | |
336 | do { | |
4c28f408 PA |
337 | /* Use SIGKILL instead of PTRACE_KILL because the former works even |
338 | if the thread is running, while the later doesn't. */ | |
339 | kill (pid, SIGKILL); | |
56aac7e8 MS |
340 | ret = waitpid (pid, &status, 0); |
341 | /* We might get a SIGCHLD instead of an exit status. This is | |
342 | aggravated by the first kill above - a child has just | |
343 | died. MVS comment cut-and-pasted from linux-nat. */ | |
344 | } while (ret == pid && WIFSTOPPED (status)); | |
345 | } | |
346 | init_fork_list (); /* Clear list, prepare to start fresh. */ | |
ac264b3b MS |
347 | } |
348 | ||
349 | /* The current inferior_ptid has exited, but there are other viable | |
350 | forks to debug. Delete the exiting one and context-switch to the | |
351 | first available. */ | |
352 | ||
3cb5bea9 | 353 | void |
ac264b3b MS |
354 | linux_fork_mourn_inferior (void) |
355 | { | |
356 | /* Wait just one more time to collect the inferior's exit status. | |
357 | Do not check whether this succeeds though, since we may be | |
358 | dealing with a process that we attached to. Such a process will | |
359 | only report its exit status to its original parent. */ | |
360 | int status; | |
361 | ||
362 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); | |
363 | ||
364 | /* OK, presumably inferior_ptid is the one who has exited. | |
365 | We need to delete that one from the fork_list, and switch | |
366 | to the next available fork. */ | |
367 | delete_fork (inferior_ptid); | |
791b663b DJ |
368 | |
369 | /* There should still be a fork - if there's only one left, | |
370 | delete_fork won't remove it, because we haven't updated | |
371 | inferior_ptid yet. */ | |
372 | gdb_assert (fork_list); | |
373 | ||
374 | fork_load_infrun_state (fork_list); | |
375 | printf_filtered (_("[Switching to %s]\n"), | |
376 | target_pid_to_str (inferior_ptid)); | |
377 | ||
378 | /* If there's only one fork, switch back to non-fork mode. */ | |
379 | if (fork_list->next == NULL) | |
380 | delete_fork (inferior_ptid); | |
ac264b3b MS |
381 | } |
382 | ||
7a7d3353 PA |
383 | /* The current inferior_ptid is being detached, but there are other |
384 | viable forks to debug. Detach and delete it and context-switch to | |
385 | the first available. */ | |
386 | ||
3cb5bea9 | 387 | void |
7a7d3353 PA |
388 | linux_fork_detach (char *args, int from_tty) |
389 | { | |
390 | /* OK, inferior_ptid is the one we are detaching from. We need to | |
391 | delete it from the fork_list, and switch to the next available | |
392 | fork. */ | |
393 | ||
394 | if (ptrace (PTRACE_DETACH, PIDGET (inferior_ptid), 0, 0)) | |
395 | error (_("Unable to detach %s"), target_pid_to_str (inferior_ptid)); | |
396 | ||
397 | delete_fork (inferior_ptid); | |
7a7d3353 PA |
398 | |
399 | /* There should still be a fork - if there's only one left, | |
400 | delete_fork won't remove it, because we haven't updated | |
401 | inferior_ptid yet. */ | |
402 | gdb_assert (fork_list); | |
403 | ||
404 | fork_load_infrun_state (fork_list); | |
405 | ||
406 | if (from_tty) | |
407 | printf_filtered (_("[Switching to %s]\n"), | |
408 | target_pid_to_str (inferior_ptid)); | |
409 | ||
410 | /* If there's only one fork, switch back to non-fork mode. */ | |
411 | if (fork_list->next == NULL) | |
412 | delete_fork (inferior_ptid); | |
413 | } | |
414 | ||
ac264b3b MS |
415 | /* Fork list <-> user interface. */ |
416 | ||
417 | static void | |
3cb5bea9 | 418 | delete_checkpoint_command (char *args, int from_tty) |
ac264b3b MS |
419 | { |
420 | ptid_t ptid; | |
421 | ||
422 | if (!args || !*args) | |
2277426b | 423 | error (_("Requires argument (checkpoint id to delete)")); |
ac264b3b MS |
424 | |
425 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
426 | if (ptid_equal (ptid, minus_one_ptid)) | |
2277426b | 427 | error (_("No such checkpoint id, %s"), args); |
ac264b3b MS |
428 | |
429 | if (ptid_equal (ptid, inferior_ptid)) | |
3cb5bea9 PA |
430 | error (_("\ |
431 | 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 | |
3cb5bea9 | 443 | detach_checkpoint_command (char *args, int from_tty) |
ac264b3b MS |
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 | ||
3cb5bea9 | 467 | /* Print information about currently known checkpoints. */ |
ac264b3b MS |
468 | |
469 | static void | |
3cb5bea9 | 470 | info_checkpoints_command (char *arg, int from_tty) |
ac264b3b | 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 | ||
3cb5bea9 | 589 | printf_filtered (_("checkpoint: fork returned pid %ld.\n"), |
ac264b3b MS |
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); | |
3cb5bea9 | 596 | printf_filtered (_(" gdb says parent = %ld.\n"), |
ac264b3b MS |
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 | 624 | |
3cb5bea9 | 625 | printf_filtered (_("Switching to %s\n"), |
ac264b3b MS |
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."), _("\ | |
3cb5bea9 | 656 | Tells gdb whether to detach the child of a fork."), |
ac264b3b MS |
657 | NULL, NULL, &setlist, &showlist); |
658 | ||
ac264b3b MS |
659 | /* Checkpoint command: create a fork of the inferior process |
660 | and set it aside for later debugging. */ | |
661 | ||
662 | add_com ("checkpoint", class_obscure, checkpoint_command, _("\ | |
663 | Fork a duplicate process (experimental).")); | |
664 | ||
2277426b PA |
665 | /* Restart command: restore the context of a specified checkpoint |
666 | process. */ | |
ac264b3b MS |
667 | |
668 | add_com ("restart", class_obscure, restart_command, _("\ | |
669 | restart <n>: restore program context from a checkpoint.\n\ | |
670 | Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'.")); | |
671 | ||
b8db102d | 672 | /* Delete checkpoint command: kill the process and remove it from |
3cb5bea9 | 673 | the fork list. */ |
ac264b3b | 674 | |
3cb5bea9 | 675 | add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\ |
2277426b | 676 | Delete a checkpoint (experimental)."), |
b8db102d | 677 | &deletelist); |
ac264b3b | 678 | |
3cb5bea9 | 679 | /* Detach checkpoint command: release the process to run independently, |
ac264b3b MS |
680 | and remove it from the fork list. */ |
681 | ||
3cb5bea9 | 682 | add_cmd ("checkpoint", class_obscure, detach_checkpoint_command, _("\ |
2277426b | 683 | Detach from a checkpoint (experimental)."), |
f73adfeb | 684 | &detachlist); |
ac264b3b | 685 | |
3cb5bea9 | 686 | /* Info checkpoints command: list all forks/checkpoints |
ac264b3b MS |
687 | currently under gdb's control. */ |
688 | ||
3cb5bea9 | 689 | add_info ("checkpoints", info_checkpoints_command, |
2277426b | 690 | _("IDs of currently known checkpoints.")); |
ac264b3b | 691 | } |