Commit | Line | Data |
---|---|---|
ac264b3b MS |
1 | /* GNU/Linux native-dependent code for debugging multiple forks. |
2 | ||
1dce6535 | 3 | Copyright (C) 2005, 2006 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
20 | Boston, MA 02110-1301, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "regcache.h" | |
25 | #include "gdbcmd.h" | |
26 | #include "infcall.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> | |
33 | #include <sys/wait.h> | |
34 | #include <sys/param.h> | |
35 | #include <dirent.h> | |
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. */ | |
56 | ULONGEST pc; /* PC for info fork. */ | |
57 | off_t *filepos; /* Set of open file descriptors' offsets. */ | |
58 | int maxfd; | |
59 | }; | |
60 | ||
61 | /* Fork list methods: */ | |
62 | ||
63 | extern int | |
64 | forks_exist_p (void) | |
65 | { | |
66 | return (fork_list != NULL); | |
67 | } | |
68 | ||
69 | /* Add a fork to internal fork list. | |
70 | Called from linux child_follow_fork. */ | |
71 | ||
72 | extern struct fork_info * | |
73 | add_fork (pid_t pid) | |
74 | { | |
75 | struct fork_info *fp; | |
76 | ||
56aac7e8 | 77 | if (fork_list == NULL && pid != PIDGET (inferior_ptid)) |
ac264b3b MS |
78 | { |
79 | /* Special case -- if this is the first fork in the list | |
80 | (the list is hitherto empty), and if this new fork is | |
81 | NOT the current inferior_ptid, then add inferior_ptid | |
82 | first, as a special zeroeth fork id. */ | |
83 | highest_fork_num = -1; | |
84 | add_fork (PIDGET (inferior_ptid)); /* safe recursion */ | |
85 | } | |
86 | ||
87 | fp = XZALLOC (struct fork_info); | |
f973ed9c | 88 | fp->ptid = ptid_build (pid, pid, 0); |
ac264b3b MS |
89 | fp->num = ++highest_fork_num; |
90 | fp->next = fork_list; | |
91 | fork_list = fp; | |
92 | return fp; | |
93 | } | |
94 | ||
95 | static void | |
96 | free_fork (struct fork_info *fp) | |
97 | { | |
98 | /* Notes on step-resume breakpoints: since this is a concern for | |
99 | threads, let's convince ourselves that it's not a concern for | |
100 | forks. There are two ways for a fork_info to be created. First, | |
101 | by the checkpoint command, in which case we're at a gdb prompt | |
102 | and there can't be any step-resume breakpoint. Second, by a fork | |
103 | in the user program, in which case we *may* have stepped into the | |
104 | fork call, but regardless of whether we follow the parent or the | |
105 | child, we will return to the same place and the step-resume | |
106 | breakpoint, if any, will take care of itself as usual. And | |
107 | unlike threads, we do not save a private copy of the step-resume | |
108 | breakpoint -- so we're OK. */ | |
109 | ||
110 | if (fp) | |
111 | { | |
112 | if (fp->savedregs) | |
113 | regcache_xfree (fp->savedregs); | |
114 | if (fp->filepos) | |
115 | xfree (fp->filepos); | |
116 | xfree (fp); | |
117 | } | |
118 | } | |
119 | ||
120 | static void | |
121 | delete_fork (ptid_t ptid) | |
122 | { | |
123 | struct fork_info *fp, *fpprev; | |
124 | ||
125 | fpprev = NULL; | |
126 | ||
127 | for (fp = fork_list; fp; fpprev = fp, fp = fp->next) | |
128 | if (ptid_equal (fp->ptid, ptid)) | |
129 | break; | |
130 | ||
131 | if (!fp) | |
132 | return; | |
133 | ||
134 | if (fpprev) | |
135 | fpprev->next = fp->next; | |
136 | else | |
137 | fork_list = fp->next; | |
138 | ||
139 | free_fork (fp); | |
140 | ||
141 | /* Special case: if there is now only one process in the list, | |
142 | and if it is (hopefully!) the current inferior_ptid, then | |
143 | remove it, leaving the list empty -- we're now down to the | |
144 | default case of debugging a single process. */ | |
145 | if (fork_list != NULL && fork_list->next == NULL && | |
146 | ptid_equal (fork_list->ptid, inferior_ptid)) | |
147 | { | |
148 | /* Last fork -- delete from list and handle as solo process | |
149 | (should be a safe recursion). */ | |
150 | delete_fork (inferior_ptid); | |
151 | } | |
152 | } | |
153 | ||
154 | /* Find a fork_info by matching PTID. */ | |
155 | static struct fork_info * | |
156 | find_fork_ptid (ptid_t ptid) | |
157 | { | |
158 | struct fork_info *fp; | |
159 | ||
160 | for (fp = fork_list; fp; fp = fp->next) | |
161 | if (ptid_equal (fp->ptid, ptid)) | |
162 | return fp; | |
163 | ||
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* Find a fork_info by matching ID. */ | |
168 | static struct fork_info * | |
169 | find_fork_id (int num) | |
170 | { | |
171 | struct fork_info *fp; | |
172 | ||
173 | for (fp = fork_list; fp; fp = fp->next) | |
174 | if (fp->num == num) | |
175 | return fp; | |
176 | ||
177 | return NULL; | |
178 | } | |
179 | ||
180 | /* Find a fork_info by matching pid. */ | |
181 | extern struct fork_info * | |
182 | find_fork_pid (pid_t pid) | |
183 | { | |
184 | struct fork_info *fp; | |
185 | ||
186 | for (fp = fork_list; fp; fp = fp->next) | |
187 | if (pid == ptid_get_pid (fp->ptid)) | |
188 | return fp; | |
189 | ||
190 | return NULL; | |
191 | } | |
192 | ||
193 | static ptid_t | |
194 | fork_id_to_ptid (int num) | |
195 | { | |
196 | struct fork_info *fork = find_fork_id (num); | |
197 | if (fork) | |
198 | return fork->ptid; | |
199 | else | |
200 | return pid_to_ptid (-1); | |
201 | } | |
202 | ||
203 | static void | |
204 | init_fork_list (void) | |
205 | { | |
206 | struct fork_info *fp, *fpnext; | |
207 | ||
208 | if (!fork_list) | |
209 | return; | |
210 | ||
211 | for (fp = fork_list; fp; fp = fpnext) | |
212 | { | |
213 | fpnext = fp->next; | |
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 MS |
247 | if (fp->savedregs && fp->clobber_regs) |
248 | regcache_cpy (current_regcache, fp->savedregs); | |
249 | ||
791b663b DJ |
250 | registers_changed (); |
251 | reinit_frame_cache (); | |
252 | ||
253 | /* We must select a new frame before making any inferior calls to | |
254 | avoid warnings. */ | |
255 | select_frame (get_current_frame ()); | |
256 | ||
257 | stop_pc = read_pc (); | |
ac264b3b MS |
258 | nullify_last_target_wait_ptid (); |
259 | ||
260 | /* Now restore the file positions of open file descriptors. */ | |
261 | if (fp->filepos) | |
262 | { | |
263 | for (i = 0; i <= fp->maxfd; i++) | |
264 | if (fp->filepos[i] != (off_t) -1) | |
265 | call_lseek (i, fp->filepos[i], SEEK_SET); | |
266 | /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because | |
267 | this is native-only. If it ever has to be cross, we'll have | |
268 | to rethink this. */ | |
269 | } | |
270 | } | |
271 | ||
272 | /* Save infrun state for the fork PTID. | |
273 | Exported for use by linux child_follow_fork. */ | |
274 | ||
275 | extern void | |
276 | fork_save_infrun_state (struct fork_info *fp, int clobber_regs) | |
277 | { | |
278 | char path[MAXPATHLEN]; | |
279 | struct dirent *de; | |
280 | DIR *d; | |
281 | ||
282 | if (fp->savedregs) | |
283 | regcache_xfree (fp->savedregs); | |
284 | ||
285 | fp->savedregs = regcache_dup (current_regcache); | |
286 | fp->clobber_regs = clobber_regs; | |
287 | fp->pc = read_pc (); | |
288 | ||
289 | if (clobber_regs) | |
290 | { | |
291 | /* Now save the 'state' (file position) of all open file descriptors. | |
292 | Unfortunately fork does not take care of that for us... */ | |
293 | snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid)); | |
294 | if ((d = opendir (path)) != NULL) | |
295 | { | |
296 | long tmp; | |
297 | ||
298 | fp->maxfd = 0; | |
299 | while ((de = readdir (d)) != NULL) | |
300 | { | |
301 | /* Count open file descriptors (actually find highest | |
302 | numbered). */ | |
303 | tmp = strtol (&de->d_name[0], NULL, 10); | |
304 | if (fp->maxfd < tmp) | |
305 | fp->maxfd = tmp; | |
306 | } | |
307 | /* Allocate array of file positions. */ | |
308 | fp->filepos = xrealloc (fp->filepos, | |
309 | (fp->maxfd + 1) * sizeof (*fp->filepos)); | |
310 | ||
311 | /* Initialize to -1 (invalid). */ | |
312 | for (tmp = 0; tmp <= fp->maxfd; tmp++) | |
313 | fp->filepos[tmp] = -1; | |
314 | ||
315 | /* Now find actual file positions. */ | |
316 | rewinddir (d); | |
317 | while ((de = readdir (d)) != NULL) | |
318 | if (isdigit (de->d_name[0])) | |
319 | { | |
320 | tmp = strtol (&de->d_name[0], NULL, 10); | |
321 | fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR); | |
322 | } | |
323 | closedir (d); | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | /* Kill 'em all, let God sort 'em out... */ | |
329 | ||
330 | extern void | |
331 | linux_fork_killall (void) | |
332 | { | |
333 | /* Walk list and kill every pid. No need to treat the | |
334 | current inferior_ptid as special (we do not return a | |
335 | status for it) -- however any process may be a child | |
336 | or a parent, so may get a SIGCHLD from a previously | |
337 | killed child. Wait them all out. */ | |
56aac7e8 | 338 | struct fork_info *fp; |
ac264b3b MS |
339 | pid_t pid, ret; |
340 | int status; | |
341 | ||
56aac7e8 MS |
342 | for (fp = fork_list; fp; fp = fp->next) |
343 | { | |
344 | pid = PIDGET (fp->ptid); | |
345 | do { | |
346 | ptrace (PT_KILL, pid, 0, 0); | |
347 | ret = waitpid (pid, &status, 0); | |
348 | /* We might get a SIGCHLD instead of an exit status. This is | |
349 | aggravated by the first kill above - a child has just | |
350 | died. MVS comment cut-and-pasted from linux-nat. */ | |
351 | } while (ret == pid && WIFSTOPPED (status)); | |
352 | } | |
353 | init_fork_list (); /* Clear list, prepare to start fresh. */ | |
ac264b3b MS |
354 | } |
355 | ||
356 | /* The current inferior_ptid has exited, but there are other viable | |
357 | forks to debug. Delete the exiting one and context-switch to the | |
358 | first available. */ | |
359 | ||
360 | extern void | |
361 | linux_fork_mourn_inferior (void) | |
362 | { | |
363 | /* Wait just one more time to collect the inferior's exit status. | |
364 | Do not check whether this succeeds though, since we may be | |
365 | dealing with a process that we attached to. Such a process will | |
366 | only report its exit status to its original parent. */ | |
367 | int status; | |
368 | ||
369 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); | |
370 | ||
371 | /* OK, presumably inferior_ptid is the one who has exited. | |
372 | We need to delete that one from the fork_list, and switch | |
373 | to the next available fork. */ | |
374 | delete_fork (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); | |
414 | } | |
415 | ||
416 | static void | |
417 | detach_fork_command (char *args, int from_tty) | |
418 | { | |
419 | ptid_t ptid; | |
420 | ||
421 | if (!args || !*args) | |
422 | error (_("Requires argument (fork id to detach)")); | |
423 | ||
424 | ptid = fork_id_to_ptid (parse_and_eval_long (args)); | |
425 | if (ptid_equal (ptid, minus_one_ptid)) | |
426 | error (_("No such fork id, %s"), args); | |
427 | ||
428 | if (ptid_equal (ptid, inferior_ptid)) | |
429 | error (_("Please switch to another fork before detaching the current one")); | |
430 | ||
1dce6535 | 431 | if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0)) |
ac264b3b MS |
432 | error (_("Unable to detach %s"), target_pid_to_str (ptid)); |
433 | ||
434 | if (from_tty) | |
435 | printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid)); | |
436 | ||
437 | delete_fork (ptid); | |
438 | } | |
439 | ||
440 | /* Print information about currently known forks. */ | |
441 | ||
442 | static void | |
443 | info_forks_command (char *arg, int from_tty) | |
444 | { | |
445 | struct frame_info *cur_frame; | |
446 | struct symtab_and_line sal; | |
447 | struct symtab *cur_symtab; | |
448 | struct fork_info *fp; | |
449 | int cur_line; | |
450 | ULONGEST pc; | |
b8db102d MS |
451 | int requested = -1; |
452 | struct fork_info *printed = NULL; | |
453 | ||
454 | if (arg && *arg) | |
455 | requested = (int) parse_and_eval_long (arg); | |
ac264b3b MS |
456 | |
457 | for (fp = fork_list; fp; fp = fp->next) | |
458 | { | |
b8db102d MS |
459 | if (requested > 0 && fp->num != requested) |
460 | continue; | |
461 | ||
462 | printed = fp; | |
ac264b3b MS |
463 | if (ptid_equal (fp->ptid, inferior_ptid)) |
464 | { | |
465 | printf_filtered ("* "); | |
466 | pc = read_pc (); | |
467 | } | |
468 | else | |
469 | { | |
470 | printf_filtered (" "); | |
471 | pc = fp->pc; | |
472 | } | |
473 | printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid)); | |
474 | if (fp->num == 0) | |
475 | printf_filtered (_(" (main process)")); | |
476 | printf_filtered (_(" at ")); | |
477 | deprecated_print_address_numeric (pc, 1, gdb_stdout); | |
478 | ||
479 | sal = find_pc_line (pc, 0); | |
480 | if (sal.symtab) | |
481 | { | |
482 | char *tmp = strrchr (sal.symtab->filename, '/'); | |
483 | ||
484 | if (tmp) | |
485 | printf_filtered (_(", file %s"), tmp + 1); | |
486 | else | |
487 | printf_filtered (_(", file %s"), sal.symtab->filename); | |
488 | } | |
489 | if (sal.line) | |
490 | printf_filtered (_(", line %d"), sal.line); | |
491 | if (!sal.symtab && !sal.line) | |
492 | { | |
493 | struct minimal_symbol *msym; | |
494 | ||
495 | msym = lookup_minimal_symbol_by_pc (pc); | |
496 | if (msym) | |
497 | printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym)); | |
498 | } | |
499 | ||
500 | putchar_filtered ('\n'); | |
501 | } | |
b8db102d MS |
502 | if (printed == NULL) |
503 | { | |
504 | if (requested > 0) | |
505 | printf_filtered (_("No fork number %d.\n"), requested); | |
506 | else | |
507 | printf_filtered (_("No forks.\n")); | |
508 | } | |
ac264b3b MS |
509 | } |
510 | ||
511 | /* Save/restore mode variable 'detach_fork': | |
512 | We need to temporarily take over this mode variable, while | |
513 | preserving the user-specified state, and make sure that it | |
514 | gets restored in case of error. | |
515 | ||
516 | The int pointer that we use comes from the caller, so we can | |
517 | be called more than once (even though currently we don't need to). */ | |
518 | ||
519 | static void | |
520 | restore_detach_fork (void *arg) | |
521 | { | |
522 | detach_fork = *(int *) arg; | |
523 | } | |
524 | ||
525 | static struct cleanup * | |
526 | save_detach_fork (int *saved_val) | |
527 | { | |
528 | *saved_val = detach_fork; | |
529 | return make_cleanup (restore_detach_fork, (void *) saved_val); | |
530 | } | |
531 | ||
532 | static void | |
533 | checkpoint_command (char *args, int from_tty) | |
534 | { | |
535 | struct target_waitstatus last_target_waitstatus; | |
536 | ptid_t last_target_ptid; | |
537 | struct value *fork_fn = NULL, *ret; | |
538 | struct fork_info *fp; | |
539 | pid_t retpid; | |
540 | struct cleanup *old_chain; | |
541 | long i; | |
542 | /* Make this temp var static, 'cause it's used in the error context. */ | |
543 | static int temp_detach_fork; | |
544 | ||
545 | /* Make the inferior fork, record its (and gdb's) state. */ | |
546 | ||
547 | if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL) | |
548 | fork_fn = find_function_in_inferior ("fork"); | |
549 | if (!fork_fn) | |
550 | if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL) | |
551 | fork_fn = find_function_in_inferior ("fork"); | |
552 | if (!fork_fn) | |
553 | error (_("checkpoint: can't find fork function in inferior.")); | |
554 | ||
555 | ret = value_from_longest (builtin_type_int, 0); | |
556 | old_chain = save_detach_fork (&temp_detach_fork); | |
557 | detach_fork = 0; | |
558 | ret = call_function_by_hand (fork_fn, 0, &ret); | |
559 | do_cleanups (old_chain); | |
560 | if (!ret) /* Probably can't happen. */ | |
561 | error (_("checkpoint: call_function_by_hand returned null.")); | |
562 | ||
563 | retpid = value_as_long (ret); | |
564 | get_last_target_status (&last_target_ptid, &last_target_waitstatus); | |
565 | if (from_tty) | |
566 | { | |
567 | int parent_pid; | |
568 | ||
569 | printf_filtered (_("checkpoint: fork returned pid %ld.\n"), | |
570 | (long) retpid); | |
571 | if (info_verbose) | |
572 | { | |
573 | parent_pid = ptid_get_lwp (last_target_ptid); | |
574 | if (parent_pid == 0) | |
575 | parent_pid = ptid_get_pid (last_target_ptid); | |
576 | printf_filtered (_(" gdb says parent = %ld.\n"), | |
577 | (long) parent_pid); | |
578 | } | |
579 | } | |
580 | ||
581 | fp = find_fork_pid (retpid); | |
582 | if (!fp) | |
583 | error (_("Failed to find new fork")); | |
584 | fork_save_infrun_state (fp, 1); | |
585 | } | |
586 | ||
587 | static void | |
588 | linux_fork_context (struct fork_info *newfp, int from_tty) | |
589 | { | |
590 | /* Now we attempt to switch processes. */ | |
591 | struct fork_info *oldfp = find_fork_ptid (inferior_ptid); | |
592 | ptid_t ptid; | |
593 | int id, i; | |
594 | ||
595 | if (!newfp) | |
596 | error (_("No such fork/process")); | |
597 | ||
598 | if (!oldfp) | |
791b663b | 599 | oldfp = add_fork (ptid_get_pid (inferior_ptid)); |
ac264b3b MS |
600 | |
601 | fork_save_infrun_state (oldfp, 1); | |
ac264b3b | 602 | fork_load_infrun_state (newfp); |
ac264b3b MS |
603 | |
604 | printf_filtered (_("Switching to %s\n"), | |
605 | target_pid_to_str (inferior_ptid)); | |
606 | ||
607 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
608 | } | |
609 | ||
610 | /* Switch inferior process (fork) context, by process id. */ | |
611 | static void | |
612 | process_command (char *args, int from_tty) | |
613 | { | |
614 | struct fork_info *fp; | |
615 | ||
616 | if (!args || !*args) | |
617 | error (_("Requires argument (process id to switch to)")); | |
618 | ||
619 | if ((fp = find_fork_pid (parse_and_eval_long (args))) == NULL) | |
620 | error (_("Not found: process id %s"), args); | |
621 | ||
622 | linux_fork_context (fp, from_tty); | |
623 | } | |
624 | ||
625 | /* Switch inferior process (fork) context, by fork id. */ | |
626 | static void | |
627 | fork_command (char *args, int from_tty) | |
628 | { | |
629 | struct fork_info *fp; | |
630 | ||
631 | if (!args || !*args) | |
632 | error (_("Requires argument (fork id to switch to)")); | |
633 | ||
634 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
635 | error (_("Not found: fork id %s"), args); | |
636 | ||
637 | linux_fork_context (fp, from_tty); | |
638 | } | |
639 | ||
640 | /* Switch inferior process (fork) context, by checkpoint id. */ | |
641 | static void | |
642 | restart_command (char *args, int from_tty) | |
643 | { | |
644 | struct fork_info *fp; | |
645 | ||
646 | if (!args || !*args) | |
647 | error (_("Requires argument (checkpoint id to restart)")); | |
648 | ||
649 | if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL) | |
650 | error (_("Not found: checkpoint id %s"), args); | |
651 | ||
652 | linux_fork_context (fp, from_tty); | |
653 | } | |
654 | ||
655 | void | |
656 | _initialize_linux_fork (void) | |
657 | { | |
658 | init_fork_list (); | |
659 | ||
660 | /* Set/show detach-on-fork: user-settable mode. */ | |
661 | ||
662 | add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\ | |
663 | Set whether gdb will detach the child of a fork."), _("\ | |
664 | Show whether gdb will detach the child of a fork."), _("\ | |
665 | Tells gdb whether to detach the child of a fork."), | |
666 | NULL, NULL, &setlist, &showlist); | |
667 | ||
668 | /* Set/show restart-auto-finish: user-settable count. Causes the | |
669 | first "restart" of a fork to do some number of "finish" commands | |
670 | before returning to user. | |
671 | ||
672 | Useful because otherwise the virgin fork process will be stopped | |
673 | somewhere in the un-interesting fork system call. */ | |
674 | ||
675 | /* Checkpoint command: create a fork of the inferior process | |
676 | and set it aside for later debugging. */ | |
677 | ||
678 | add_com ("checkpoint", class_obscure, checkpoint_command, _("\ | |
679 | Fork a duplicate process (experimental).")); | |
680 | ||
681 | /* Restart command: restore the context of a specified fork | |
682 | process. May be used for "program forks" as well as for | |
683 | "debugger forks" (checkpoints). */ | |
684 | ||
685 | add_com ("restart", class_obscure, restart_command, _("\ | |
686 | restart <n>: restore program context from a checkpoint.\n\ | |
687 | Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'.")); | |
688 | ||
b8db102d | 689 | /* Delete checkpoint command: kill the process and remove it from |
ac264b3b MS |
690 | fork list. */ |
691 | ||
b8db102d MS |
692 | add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\ |
693 | Delete a fork/checkpoint (experimental)."), | |
694 | &deletelist); | |
ac264b3b | 695 | |
f73adfeb | 696 | /* Detach checkpoint command: release the process to run independently, |
ac264b3b MS |
697 | and remove it from the fork list. */ |
698 | ||
f73adfeb AS |
699 | add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\ |
700 | Detach from a fork/checkpoint (experimental)."), | |
701 | &detachlist); | |
ac264b3b MS |
702 | |
703 | /* Info checkpoints command: list all forks/checkpoints | |
704 | currently under gdb's control. */ | |
705 | ||
706 | add_info ("checkpoints", info_forks_command, | |
707 | _("IDs of currently known forks/checkpoints.")); | |
708 | ||
709 | /* Command aliases (let "fork" and "checkpoint" be used | |
710 | interchangeably). */ | |
711 | ||
b8db102d | 712 | add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &deletelist); |
f73adfeb | 713 | add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &detachlist); |
ac264b3b MS |
714 | add_info_alias ("forks", "checkpoints", 0); |
715 | ||
716 | /* "fork <n>" (by analogy to "thread <n>"). */ | |
717 | add_com ("fork", class_obscure, fork_command, _("\ | |
718 | fork <n>: Switch between forked processes.\n\ | |
719 | Argument 'n' is fork ID, as displayed by 'info forks'.")); | |
720 | ||
721 | /* "process <proc id>" as opposed to "fork <fork id>". */ | |
722 | add_com ("process", class_obscure, process_command, _("\ | |
723 | process <pid>: Switch between forked processes.\n\ | |
724 | Argument 'pid' is process ID, as displayed by 'info forks' or 'shell ps'.")); | |
725 | } |