Commit | Line | Data |
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ac264b3b MS |
1 | /* GNU/Linux native-dependent code for debugging multiple forks. |
2 | ||
9b254dd1 | 3 | Copyright (C) 2005, 2006, 2007, 2008 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" | |
21 | #include "inferior.h" | |
22 | #include "regcache.h" | |
23 | #include "gdbcmd.h" | |
24 | #include "infcall.h" | |
3e3b026f | 25 | #include "objfiles.h" |
791b663b | 26 | #include "gdb_assert.h" |
ac264b3b MS |
27 | #include "gdb_string.h" |
28 | #include "linux-fork.h" | |
f973ed9c | 29 | #include "linux-nat.h" |
ac264b3b MS |
30 | |
31 | #include <sys/ptrace.h> | |
3c61c145 | 32 | #include "gdb_wait.h" |
ac264b3b | 33 | #include <sys/param.h> |
91c06669 | 34 | #include "gdb_dirent.h" |
ac264b3b MS |
35 | #include <ctype.h> |
36 | ||
37 | struct fork_info *fork_list; | |
38 | static int highest_fork_num; | |
39 | ||
40 | /* Prevent warning from -Wmissing-prototypes. */ | |
41 | extern void _initialize_linux_fork (void); | |
42 | ||
43 | int detach_fork = 1; /* Default behavior is to detach | |
44 | newly forked processes (legacy). */ | |
45 | ||
46 | /* Fork list data structure: */ | |
47 | struct fork_info | |
48 | { | |
49 | struct fork_info *next; | |
50 | ptid_t ptid; | |
51 | int num; /* Convenient handle (GDB fork id) */ | |
52 | struct regcache *savedregs; /* Convenient for info fork, saves | |
53 | having to actually switch contexts. */ | |
54 | int clobber_regs; /* True if we should restore saved regs. */ | |
55 | ULONGEST pc; /* PC for info fork. */ | |
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; | |
7f9f62ba | 213 | delete_inferior (ptid_get_pid (fp->ptid)); |
ac264b3b MS |
214 | free_fork (fp); |
215 | } | |
216 | ||
217 | fork_list = NULL; | |
218 | } | |
219 | ||
220 | /* Fork list <-> gdb interface. */ | |
221 | ||
222 | /* Utility function for fork_load/fork_save. | |
223 | Calls lseek in the (current) inferior process. */ | |
224 | ||
225 | static off_t | |
226 | call_lseek (int fd, off_t offset, int whence) | |
227 | { | |
228 | char exp[80]; | |
229 | ||
230 | snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)", | |
231 | fd, (long) offset, whence); | |
232 | return (off_t) parse_and_eval_long (&exp[0]); | |
233 | } | |
234 | ||
235 | /* Load infrun state for the fork PTID. */ | |
236 | ||
237 | static void | |
238 | fork_load_infrun_state (struct fork_info *fp) | |
239 | { | |
240 | extern void nullify_last_target_wait_ptid (); | |
241 | int i; | |
242 | ||
791b663b DJ |
243 | inferior_ptid = fp->ptid; |
244 | ||
f973ed9c DJ |
245 | linux_nat_switch_fork (inferior_ptid); |
246 | ||
ac264b3b | 247 | if (fp->savedregs && fp->clobber_regs) |
594f7785 | 248 | regcache_cpy (get_current_regcache (), fp->savedregs); |
ac264b3b | 249 | |
791b663b DJ |
250 | registers_changed (); |
251 | reinit_frame_cache (); | |
252 | ||
791b663b | 253 | stop_pc = read_pc (); |
ac264b3b MS |
254 | nullify_last_target_wait_ptid (); |
255 | ||
256 | /* Now restore the file positions of open file descriptors. */ | |
257 | if (fp->filepos) | |
258 | { | |
259 | for (i = 0; i <= fp->maxfd; i++) | |
260 | if (fp->filepos[i] != (off_t) -1) | |
261 | call_lseek (i, fp->filepos[i], SEEK_SET); | |
262 | /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because | |
263 | this is native-only. If it ever has to be cross, we'll have | |
264 | to rethink this. */ | |
265 | } | |
266 | } | |
267 | ||
268 | /* Save infrun state for the fork PTID. | |
269 | Exported for use by linux child_follow_fork. */ | |
270 | ||
271 | extern void | |
272 | fork_save_infrun_state (struct fork_info *fp, int clobber_regs) | |
273 | { | |
274 | char path[MAXPATHLEN]; | |
275 | struct dirent *de; | |
276 | DIR *d; | |
277 | ||
278 | if (fp->savedregs) | |
279 | regcache_xfree (fp->savedregs); | |
280 | ||
594f7785 | 281 | fp->savedregs = regcache_dup (get_current_regcache ()); |
ac264b3b MS |
282 | fp->clobber_regs = clobber_regs; |
283 | fp->pc = read_pc (); | |
284 | ||
285 | if (clobber_regs) | |
286 | { | |
287 | /* Now save the 'state' (file position) of all open file descriptors. | |
288 | Unfortunately fork does not take care of that for us... */ | |
289 | snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid)); | |
290 | if ((d = opendir (path)) != NULL) | |
291 | { | |
292 | long tmp; | |
293 | ||
294 | fp->maxfd = 0; | |
295 | while ((de = readdir (d)) != NULL) | |
296 | { | |
297 | /* Count open file descriptors (actually find highest | |
298 | numbered). */ | |
299 | tmp = strtol (&de->d_name[0], NULL, 10); | |
300 | if (fp->maxfd < tmp) | |
301 | fp->maxfd = tmp; | |
302 | } | |
303 | /* Allocate array of file positions. */ | |
304 | fp->filepos = xrealloc (fp->filepos, | |
305 | (fp->maxfd + 1) * sizeof (*fp->filepos)); | |
306 | ||
307 | /* Initialize to -1 (invalid). */ | |
308 | for (tmp = 0; tmp <= fp->maxfd; tmp++) | |
309 | fp->filepos[tmp] = -1; | |
310 | ||
311 | /* Now find actual file positions. */ | |
312 | rewinddir (d); | |
313 | while ((de = readdir (d)) != NULL) | |
314 | if (isdigit (de->d_name[0])) | |
315 | { | |
316 | tmp = strtol (&de->d_name[0], NULL, 10); | |
317 | fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR); | |
318 | } | |
319 | closedir (d); | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | /* Kill 'em all, let God sort 'em out... */ | |
325 | ||
326 | extern void | |
327 | linux_fork_killall (void) | |
328 | { | |
329 | /* Walk list and kill every pid. No need to treat the | |
330 | current inferior_ptid as special (we do not return a | |
331 | status for it) -- however any process may be a child | |
332 | or a parent, so may get a SIGCHLD from a previously | |
333 | killed child. Wait them all out. */ | |
56aac7e8 | 334 | struct fork_info *fp; |
ac264b3b MS |
335 | pid_t pid, ret; |
336 | int status; | |
337 | ||
56aac7e8 MS |
338 | for (fp = fork_list; fp; fp = fp->next) |
339 | { | |
340 | pid = PIDGET (fp->ptid); | |
341 | do { | |
4c28f408 PA |
342 | /* Use SIGKILL instead of PTRACE_KILL because the former works even |
343 | if the thread is running, while the later doesn't. */ | |
344 | kill (pid, SIGKILL); | |
56aac7e8 MS |
345 | ret = waitpid (pid, &status, 0); |
346 | /* We might get a SIGCHLD instead of an exit status. This is | |
347 | aggravated by the first kill above - a child has just | |
348 | died. MVS comment cut-and-pasted from linux-nat. */ | |
349 | } while (ret == pid && WIFSTOPPED (status)); | |
350 | } | |
351 | init_fork_list (); /* Clear list, prepare to start fresh. */ | |
ac264b3b MS |
352 | } |
353 | ||
354 | /* The current inferior_ptid has exited, but there are other viable | |
355 | forks to debug. Delete the exiting one and context-switch to the | |
356 | first available. */ | |
357 | ||
358 | extern void | |
359 | linux_fork_mourn_inferior (void) | |
360 | { | |
361 | /* Wait just one more time to collect the inferior's exit status. | |
362 | Do not check whether this succeeds though, since we may be | |
363 | dealing with a process that we attached to. Such a process will | |
364 | only report its exit status to its original parent. */ | |
365 | int status; | |
366 | ||
367 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); | |
368 | ||
369 | /* OK, presumably inferior_ptid is the one who has exited. | |
370 | We need to delete that one from the fork_list, and switch | |
371 | to the next available fork. */ | |
372 | delete_fork (inferior_ptid); | |
7f9f62ba PA |
373 | /* Delete process from GDB's inferior list. */ |
374 | delete_inferior (ptid_get_pid (inferior_ptid)); | |
791b663b DJ |
375 | |
376 | /* There should still be a fork - if there's only one left, | |
377 | delete_fork won't remove it, because we haven't updated | |
378 | inferior_ptid yet. */ | |
379 | gdb_assert (fork_list); | |
380 | ||
381 | fork_load_infrun_state (fork_list); | |
382 | printf_filtered (_("[Switching to %s]\n"), | |
383 | target_pid_to_str (inferior_ptid)); | |
384 | ||
385 | /* If there's only one fork, switch back to non-fork mode. */ | |
386 | if (fork_list->next == NULL) | |
387 | delete_fork (inferior_ptid); | |
ac264b3b MS |
388 | } |
389 | ||
390 | /* Fork list <-> user interface. */ | |
391 | ||
392 | static void | |
393 | delete_fork_command (char *args, int from_tty) | |
394 | { | |
395 | ptid_t ptid; | |
396 | ||
397 | if (!args || !*args) | |
398 | error (_("Requires argument (fork/checkpoint id to delete)")); | |
399 | ||
400 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
401 | if (ptid_equal (ptid, minus_one_ptid)) | |
402 | error (_("No such fork/checkpoint id, %s"), args); | |
403 | ||
404 | if (ptid_equal (ptid, inferior_ptid)) | |
405 | error (_("Please switch to another fork/checkpoint before deleting the current one")); | |
406 | ||
1dce6535 | 407 | if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0)) |
ac264b3b MS |
408 | error (_("Unable to kill pid %s"), target_tid_to_str (ptid)); |
409 | ||
410 | if (from_tty) | |
411 | printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid)); | |
412 | ||
413 | delete_fork (ptid); | |
7f9f62ba PA |
414 | /* Delete process from GDB's inferior list. */ |
415 | delete_inferior (ptid_get_pid (ptid)); | |
ac264b3b MS |
416 | } |
417 | ||
418 | static void | |
419 | detach_fork_command (char *args, int from_tty) | |
420 | { | |
421 | ptid_t ptid; | |
422 | ||
423 | if (!args || !*args) | |
424 | error (_("Requires argument (fork id to detach)")); | |
425 | ||
426 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
427 | if (ptid_equal (ptid, minus_one_ptid)) | |
428 | error (_("No such fork id, %s"), args); | |
429 | ||
430 | if (ptid_equal (ptid, inferior_ptid)) | |
431 | error (_("Please switch to another fork before detaching the current one")); | |
432 | ||
1dce6535 | 433 | if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0)) |
ac264b3b MS |
434 | error (_("Unable to detach %s"), target_pid_to_str (ptid)); |
435 | ||
436 | if (from_tty) | |
437 | printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid)); | |
438 | ||
439 | delete_fork (ptid); | |
7f9f62ba PA |
440 | /* Delete process from GDB's process table. */ |
441 | detach_inferior (ptid_get_pid (ptid)); | |
ac264b3b MS |
442 | } |
443 | ||
444 | /* Print information about currently known forks. */ | |
445 | ||
446 | static void | |
447 | info_forks_command (char *arg, int from_tty) | |
448 | { | |
449 | struct frame_info *cur_frame; | |
450 | struct symtab_and_line sal; | |
451 | struct symtab *cur_symtab; | |
452 | struct fork_info *fp; | |
453 | int cur_line; | |
454 | ULONGEST pc; | |
b8db102d MS |
455 | int requested = -1; |
456 | struct fork_info *printed = NULL; | |
457 | ||
458 | if (arg && *arg) | |
459 | requested = (int) parse_and_eval_long (arg); | |
ac264b3b MS |
460 | |
461 | for (fp = fork_list; fp; fp = fp->next) | |
462 | { | |
b8db102d MS |
463 | if (requested > 0 && fp->num != requested) |
464 | continue; | |
465 | ||
466 | printed = fp; | |
ac264b3b MS |
467 | if (ptid_equal (fp->ptid, inferior_ptid)) |
468 | { | |
469 | printf_filtered ("* "); | |
470 | pc = read_pc (); | |
471 | } | |
472 | else | |
473 | { | |
474 | printf_filtered (" "); | |
475 | pc = fp->pc; | |
476 | } | |
477 | printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid)); | |
478 | if (fp->num == 0) | |
479 | printf_filtered (_(" (main process)")); | |
480 | printf_filtered (_(" at ")); | |
ed49a04f | 481 | fputs_filtered (paddress (pc), gdb_stdout); |
ac264b3b MS |
482 | |
483 | sal = find_pc_line (pc, 0); | |
484 | if (sal.symtab) | |
485 | { | |
486 | char *tmp = strrchr (sal.symtab->filename, '/'); | |
487 | ||
488 | if (tmp) | |
489 | printf_filtered (_(", file %s"), tmp + 1); | |
490 | else | |
491 | printf_filtered (_(", file %s"), sal.symtab->filename); | |
492 | } | |
493 | if (sal.line) | |
494 | printf_filtered (_(", line %d"), sal.line); | |
495 | if (!sal.symtab && !sal.line) | |
496 | { | |
497 | struct minimal_symbol *msym; | |
498 | ||
499 | msym = lookup_minimal_symbol_by_pc (pc); | |
500 | if (msym) | |
501 | printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym)); | |
502 | } | |
503 | ||
504 | putchar_filtered ('\n'); | |
505 | } | |
b8db102d MS |
506 | if (printed == NULL) |
507 | { | |
508 | if (requested > 0) | |
509 | printf_filtered (_("No fork number %d.\n"), requested); | |
510 | else | |
511 | printf_filtered (_("No forks.\n")); | |
512 | } | |
ac264b3b MS |
513 | } |
514 | ||
515 | /* Save/restore mode variable 'detach_fork': | |
516 | We need to temporarily take over this mode variable, while | |
517 | preserving the user-specified state, and make sure that it | |
518 | gets restored in case of error. | |
519 | ||
520 | The int pointer that we use comes from the caller, so we can | |
521 | be called more than once (even though currently we don't need to). */ | |
522 | ||
523 | static void | |
524 | restore_detach_fork (void *arg) | |
525 | { | |
526 | detach_fork = *(int *) arg; | |
527 | } | |
528 | ||
529 | static struct cleanup * | |
530 | save_detach_fork (int *saved_val) | |
531 | { | |
532 | *saved_val = detach_fork; | |
533 | return make_cleanup (restore_detach_fork, (void *) saved_val); | |
534 | } | |
535 | ||
536 | static void | |
537 | checkpoint_command (char *args, int from_tty) | |
538 | { | |
3e3b026f UW |
539 | struct objfile *fork_objf; |
540 | struct gdbarch *gdbarch; | |
ac264b3b MS |
541 | struct target_waitstatus last_target_waitstatus; |
542 | ptid_t last_target_ptid; | |
543 | struct value *fork_fn = NULL, *ret; | |
544 | struct fork_info *fp; | |
545 | pid_t retpid; | |
546 | struct cleanup *old_chain; | |
547 | long i; | |
548 | /* Make this temp var static, 'cause it's used in the error context. */ | |
549 | static int temp_detach_fork; | |
550 | ||
74960c60 VP |
551 | /* Remove breakpoints, so that they are not inserted |
552 | in the forked process. */ | |
553 | remove_breakpoints (); | |
554 | ||
ac264b3b MS |
555 | /* Make the inferior fork, record its (and gdb's) state. */ |
556 | ||
557 | if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL) | |
3e3b026f | 558 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
559 | if (!fork_fn) |
560 | if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL) | |
3e3b026f | 561 | fork_fn = find_function_in_inferior ("fork", &fork_objf); |
ac264b3b MS |
562 | if (!fork_fn) |
563 | error (_("checkpoint: can't find fork function in inferior.")); | |
564 | ||
3e3b026f UW |
565 | gdbarch = get_objfile_arch (fork_objf); |
566 | ret = value_from_longest (builtin_type (gdbarch)->builtin_int, 0); | |
ac264b3b MS |
567 | old_chain = save_detach_fork (&temp_detach_fork); |
568 | detach_fork = 0; | |
569 | ret = call_function_by_hand (fork_fn, 0, &ret); | |
570 | do_cleanups (old_chain); | |
571 | if (!ret) /* Probably can't happen. */ | |
572 | error (_("checkpoint: call_function_by_hand returned null.")); | |
573 | ||
574 | retpid = value_as_long (ret); | |
575 | get_last_target_status (&last_target_ptid, &last_target_waitstatus); | |
576 | if (from_tty) | |
577 | { | |
578 | int parent_pid; | |
579 | ||
580 | printf_filtered (_("checkpoint: fork returned pid %ld.\n"), | |
581 | (long) retpid); | |
582 | if (info_verbose) | |
583 | { | |
584 | parent_pid = ptid_get_lwp (last_target_ptid); | |
585 | if (parent_pid == 0) | |
586 | parent_pid = ptid_get_pid (last_target_ptid); | |
587 | printf_filtered (_(" gdb says parent = %ld.\n"), | |
588 | (long) parent_pid); | |
589 | } | |
590 | } | |
591 | ||
592 | fp = find_fork_pid (retpid); | |
593 | if (!fp) | |
594 | error (_("Failed to find new fork")); | |
595 | fork_save_infrun_state (fp, 1); | |
74960c60 | 596 | insert_breakpoints (); |
ac264b3b MS |
597 | } |
598 | ||
599 | static void | |
600 | linux_fork_context (struct fork_info *newfp, int from_tty) | |
601 | { | |
602 | /* Now we attempt to switch processes. */ | |
603 | struct fork_info *oldfp = find_fork_ptid (inferior_ptid); | |
604 | ptid_t ptid; | |
605 | int id, i; | |
606 | ||
607 | if (!newfp) | |
608 | error (_("No such fork/process")); | |
609 | ||
610 | if (!oldfp) | |
791b663b | 611 | oldfp = add_fork (ptid_get_pid (inferior_ptid)); |
ac264b3b MS |
612 | |
613 | fork_save_infrun_state (oldfp, 1); | |
74960c60 | 614 | remove_breakpoints (); |
ac264b3b | 615 | fork_load_infrun_state (newfp); |
74960c60 | 616 | insert_breakpoints (); |
ac264b3b MS |
617 | |
618 | printf_filtered (_("Switching to %s\n"), | |
619 | target_pid_to_str (inferior_ptid)); | |
620 | ||
621 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
622 | } | |
623 | ||
624 | /* Switch inferior process (fork) context, by process id. */ | |
625 | static void | |
626 | process_command (char *args, int from_tty) | |
627 | { | |
628 | struct fork_info *fp; | |
629 | ||
630 | if (!args || !*args) | |
631 | error (_("Requires argument (process id to switch to)")); | |
632 | ||
633 | if ((fp = find_fork_pid (parse_and_eval_long (args))) == NULL) | |
634 | error (_("Not found: process id %s"), args); | |
635 | ||
636 | linux_fork_context (fp, from_tty); | |
637 | } | |
638 | ||
639 | /* Switch inferior process (fork) context, by fork id. */ | |
640 | static void | |
641 | fork_command (char *args, int from_tty) | |
642 | { | |
643 | struct fork_info *fp; | |
644 | ||
645 | if (!args || !*args) | |
646 | error (_("Requires argument (fork id to switch to)")); | |
647 | ||
648 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
649 | error (_("Not found: fork id %s"), args); | |
650 | ||
651 | linux_fork_context (fp, from_tty); | |
652 | } | |
653 | ||
654 | /* Switch inferior process (fork) context, by checkpoint id. */ | |
655 | static void | |
656 | restart_command (char *args, int from_tty) | |
657 | { | |
658 | struct fork_info *fp; | |
659 | ||
660 | if (!args || !*args) | |
661 | error (_("Requires argument (checkpoint id to restart)")); | |
662 | ||
663 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
664 | error (_("Not found: checkpoint id %s"), args); | |
665 | ||
666 | linux_fork_context (fp, from_tty); | |
667 | } | |
668 | ||
669 | void | |
670 | _initialize_linux_fork (void) | |
671 | { | |
672 | init_fork_list (); | |
673 | ||
674 | /* Set/show detach-on-fork: user-settable mode. */ | |
675 | ||
676 | add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\ | |
677 | Set whether gdb will detach the child of a fork."), _("\ | |
678 | Show whether gdb will detach the child of a fork."), _("\ | |
679 | Tells gdb whether to detach the child of a fork."), | |
680 | NULL, NULL, &setlist, &showlist); | |
681 | ||
682 | /* Set/show restart-auto-finish: user-settable count. Causes the | |
683 | first "restart" of a fork to do some number of "finish" commands | |
684 | before returning to user. | |
685 | ||
686 | Useful because otherwise the virgin fork process will be stopped | |
687 | somewhere in the un-interesting fork system call. */ | |
688 | ||
689 | /* Checkpoint command: create a fork of the inferior process | |
690 | and set it aside for later debugging. */ | |
691 | ||
692 | add_com ("checkpoint", class_obscure, checkpoint_command, _("\ | |
693 | Fork a duplicate process (experimental).")); | |
694 | ||
695 | /* Restart command: restore the context of a specified fork | |
696 | process. May be used for "program forks" as well as for | |
697 | "debugger forks" (checkpoints). */ | |
698 | ||
699 | add_com ("restart", class_obscure, restart_command, _("\ | |
700 | restart <n>: restore program context from a checkpoint.\n\ | |
701 | Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'.")); | |
702 | ||
b8db102d | 703 | /* Delete checkpoint command: kill the process and remove it from |
ac264b3b MS |
704 | fork list. */ |
705 | ||
b8db102d MS |
706 | add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\ |
707 | Delete a fork/checkpoint (experimental)."), | |
708 | &deletelist); | |
ac264b3b | 709 | |
f73adfeb | 710 | /* Detach checkpoint command: release the process to run independently, |
ac264b3b MS |
711 | and remove it from the fork list. */ |
712 | ||
f73adfeb AS |
713 | add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\ |
714 | Detach from a fork/checkpoint (experimental)."), | |
715 | &detachlist); | |
ac264b3b MS |
716 | |
717 | /* Info checkpoints command: list all forks/checkpoints | |
718 | currently under gdb's control. */ | |
719 | ||
720 | add_info ("checkpoints", info_forks_command, | |
721 | _("IDs of currently known forks/checkpoints.")); | |
722 | ||
723 | /* Command aliases (let "fork" and "checkpoint" be used | |
724 | interchangeably). */ | |
725 | ||
b8db102d | 726 | add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &deletelist); |
f73adfeb | 727 | add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &detachlist); |
ac264b3b MS |
728 | add_info_alias ("forks", "checkpoints", 0); |
729 | ||
730 | /* "fork <n>" (by analogy to "thread <n>"). */ | |
731 | add_com ("fork", class_obscure, fork_command, _("\ | |
732 | fork <n>: Switch between forked processes.\n\ | |
733 | Argument 'n' is fork ID, as displayed by 'info forks'.")); | |
734 | ||
735 | /* "process <proc id>" as opposed to "fork <fork id>". */ | |
736 | add_com ("process", class_obscure, process_command, _("\ | |
737 | process <pid>: Switch between forked processes.\n\ | |
738 | Argument 'pid' is process ID, as displayed by 'info forks' or 'shell ps'.")); | |
739 | } |