Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Target-vector operations for controlling Unix child processes, for GDB. |
2 | Copyright 1990-1996, 1998, 1999 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support. | |
4 | ||
5 | ## Contains temporary hacks.. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "frame.h" /* required by inferior.h */ | |
25 | #include "inferior.h" | |
26 | #include "target.h" | |
27 | #include "gdbcore.h" | |
28 | #include "command.h" | |
29 | #include "gdb_stat.h" | |
30 | #include <signal.h> | |
31 | #include <sys/types.h> | |
32 | #include <fcntl.h> | |
33 | ||
34 | #ifdef HAVE_WAIT_H | |
35 | # include <wait.h> | |
36 | #else | |
37 | # ifdef HAVE_SYS_WAIT_H | |
38 | # include <sys/wait.h> | |
39 | # endif | |
40 | #endif | |
41 | ||
42 | /* "wait.h" fills in the gaps left by <wait.h> */ | |
43 | #include "wait.h" | |
44 | #ifdef HAVE_UNISTD_H | |
45 | #include <unistd.h> | |
46 | #endif | |
47 | ||
48 | extern struct symtab_and_line * | |
49 | child_enable_exception_callback PARAMS ((enum exception_event_kind, int)); | |
50 | ||
51 | extern struct exception_event_record * | |
52 | child_get_current_exception_event PARAMS ((void)); | |
53 | ||
54 | extern void _initialize_inftarg PARAMS ((void)); | |
55 | ||
56 | static void | |
57 | child_prepare_to_store PARAMS ((void)); | |
58 | ||
59 | #ifndef CHILD_WAIT | |
60 | static int child_wait PARAMS ((int, struct target_waitstatus *)); | |
61 | #endif /* CHILD_WAIT */ | |
62 | ||
63 | #if !defined(CHILD_POST_WAIT) | |
64 | void | |
65 | child_post_wait PARAMS ((int, int)); | |
66 | #endif | |
67 | ||
68 | static void child_open PARAMS ((char *, int)); | |
69 | ||
70 | static void | |
71 | child_files_info PARAMS ((struct target_ops *)); | |
72 | ||
73 | static void | |
74 | child_detach PARAMS ((char *, int)); | |
75 | ||
76 | static void | |
77 | child_detach_from_process PARAMS ((int, char *, int, int)); | |
78 | ||
79 | static void | |
80 | child_attach PARAMS ((char *, int)); | |
81 | ||
82 | static void | |
83 | child_attach_to_process PARAMS ((char *, int, int)); | |
84 | ||
85 | #if !defined(CHILD_POST_ATTACH) | |
86 | extern void child_post_attach PARAMS ((int)); | |
87 | #endif | |
88 | ||
89 | static void | |
90 | child_require_attach PARAMS ((char *, int)); | |
91 | ||
92 | static void | |
93 | child_require_detach PARAMS ((int, char *, int)); | |
94 | ||
95 | static void | |
96 | ptrace_me PARAMS ((void)); | |
97 | ||
98 | static void | |
99 | ptrace_him PARAMS ((int)); | |
100 | ||
101 | static void | |
102 | child_create_inferior PARAMS ((char *, char *, char **)); | |
103 | ||
104 | static void | |
105 | child_mourn_inferior PARAMS ((void)); | |
106 | ||
107 | static int | |
108 | child_can_run PARAMS ((void)); | |
109 | ||
110 | static void | |
111 | child_stop PARAMS ((void)); | |
112 | ||
113 | #ifndef CHILD_THREAD_ALIVE | |
114 | int child_thread_alive PARAMS ((int)); | |
115 | #endif | |
116 | ||
117 | static void init_child_ops PARAMS ((void)); | |
118 | ||
119 | extern char **environ; | |
120 | ||
121 | struct target_ops child_ops; | |
122 | ||
123 | int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to | |
124 | be a runnable target. Used by targets | |
125 | that can sit atop inftarg, such as HPUX | |
126 | thread support. */ | |
127 | ||
128 | #ifndef CHILD_WAIT | |
129 | ||
130 | /*##*/ | |
131 | /* Enable HACK for ttrace work. In | |
132 | * infttrace.c/require_notification_of_events, | |
133 | * this is set to 0 so that the loop in child_wait | |
134 | * won't loop. | |
135 | */ | |
136 | int not_same_real_pid = 1; | |
137 | /*##*/ | |
138 | ||
139 | ||
140 | /* Wait for child to do something. Return pid of child, or -1 in case | |
141 | of error; store status through argument pointer OURSTATUS. */ | |
142 | ||
143 | static int | |
144 | child_wait (pid, ourstatus) | |
145 | int pid; | |
146 | struct target_waitstatus *ourstatus; | |
147 | { | |
148 | int save_errno; | |
149 | int status; | |
7a292a7a | 150 | char *execd_pathname = NULL; |
c906108c SS |
151 | int exit_status; |
152 | int related_pid; | |
153 | int syscall_id; | |
154 | enum target_waitkind kind; | |
155 | ||
156 | do { | |
157 | set_sigint_trap(); /* Causes SIGINT to be passed on to the | |
158 | attached process. */ | |
159 | set_sigio_trap (); | |
160 | ||
161 | pid = ptrace_wait (inferior_pid, &status); | |
162 | ||
163 | save_errno = errno; | |
164 | ||
165 | clear_sigio_trap (); | |
166 | ||
167 | clear_sigint_trap(); | |
168 | ||
169 | if (pid == -1) | |
170 | { | |
171 | if (save_errno == EINTR) | |
172 | continue; | |
173 | ||
174 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", | |
175 | safe_strerror (save_errno)); | |
176 | ||
177 | /* Claim it exited with unknown signal. */ | |
178 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
179 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
180 | return -1; | |
181 | } | |
182 | ||
183 | /* Did it exit? | |
184 | */ | |
185 | if (target_has_exited (pid, status, &exit_status)) | |
186 | { | |
187 | /* ??rehrauer: For now, ignore this. */ | |
188 | continue; | |
189 | } | |
190 | ||
191 | if (!target_thread_alive (pid)) | |
192 | { | |
193 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
194 | return pid; | |
195 | } | |
196 | ||
197 | if (target_has_forked (pid, &related_pid) | |
198 | && ((pid == inferior_pid) || (related_pid == inferior_pid))) | |
199 | { | |
200 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
201 | ourstatus->value.related_pid = related_pid; | |
202 | return pid; | |
203 | } | |
204 | ||
205 | if (target_has_vforked (pid, &related_pid) | |
206 | && ((pid == inferior_pid) || (related_pid == inferior_pid))) | |
207 | { | |
208 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
209 | ourstatus->value.related_pid = related_pid; | |
210 | return pid; | |
211 | } | |
212 | ||
213 | if (target_has_execd (pid, &execd_pathname)) | |
214 | { | |
215 | /* Are we ignoring initial exec events? (This is likely because | |
216 | we're in the process of starting up the inferior, and another | |
217 | (older) mechanism handles those.) If so, we'll report this | |
218 | as a regular stop, not an exec. | |
219 | */ | |
220 | if (inferior_ignoring_startup_exec_events) | |
221 | { | |
222 | inferior_ignoring_startup_exec_events--; | |
223 | } | |
224 | else | |
225 | { | |
226 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
227 | ourstatus->value.execd_pathname = execd_pathname; | |
228 | return pid; | |
229 | } | |
230 | } | |
231 | ||
232 | /* All we must do with these is communicate their occurrence | |
233 | to wait_for_inferior... | |
234 | */ | |
235 | if (target_has_syscall_event (pid, &kind, &syscall_id)) | |
236 | { | |
237 | ourstatus->kind = kind; | |
238 | ourstatus->value.syscall_id = syscall_id; | |
239 | return pid; | |
240 | } | |
241 | ||
242 | /*## } while (pid != inferior_pid); ##*/ /* Some other child died or stopped */ | |
243 | /* hack for thread testing */ | |
244 | } while( (pid != inferior_pid) && not_same_real_pid ); | |
245 | /*##*/ | |
246 | ||
247 | store_waitstatus (ourstatus, status); | |
248 | return pid; | |
249 | } | |
250 | #endif /* CHILD_WAIT */ | |
251 | ||
252 | #if !defined(CHILD_POST_WAIT) | |
253 | void | |
254 | child_post_wait (pid, wait_status) | |
255 | int pid; | |
256 | int wait_status; | |
257 | { | |
258 | /* This version of Unix doesn't require a meaningful "post wait" | |
259 | operation. | |
260 | */ | |
261 | } | |
262 | #endif | |
263 | ||
264 | ||
265 | #ifndef CHILD_THREAD_ALIVE | |
266 | ||
267 | /* Check to see if the given thread is alive. | |
268 | ||
269 | FIXME: Is kill() ever the right way to do this? I doubt it, but | |
270 | for now we're going to try and be compatable with the old thread | |
271 | code. */ | |
272 | int | |
273 | child_thread_alive (pid) | |
274 | int pid; | |
275 | { | |
276 | return (kill (pid, 0) != -1); | |
277 | } | |
278 | ||
279 | #endif | |
280 | ||
281 | static void | |
282 | child_attach_to_process (args, from_tty, after_fork) | |
283 | char * args; | |
284 | int from_tty; | |
285 | int after_fork; | |
286 | { | |
287 | if (!args) | |
288 | error_no_arg ("process-id to attach"); | |
289 | ||
290 | #ifndef ATTACH_DETACH | |
291 | error ("Can't attach to a process on this machine."); | |
292 | #else | |
293 | { | |
294 | char *exec_file; | |
295 | int pid; | |
296 | char *dummy; | |
297 | ||
298 | dummy = args; | |
299 | pid = strtol (args, &dummy, 0); | |
300 | /* Some targets don't set errno on errors, grrr! */ | |
301 | if ((pid == 0) && (args == dummy)) | |
302 | error ("Illegal process-id: %s\n", args); | |
303 | ||
304 | if (pid == getpid()) /* Trying to masturbate? */ | |
305 | error ("I refuse to debug myself!"); | |
306 | ||
307 | if (from_tty) | |
308 | { | |
309 | exec_file = (char *) get_exec_file (0); | |
310 | ||
311 | if (after_fork) | |
312 | printf_unfiltered ("Attaching after fork to %s\n", | |
313 | target_pid_to_str (pid)); | |
314 | else if (exec_file) | |
315 | printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, | |
316 | target_pid_to_str (pid)); | |
317 | else | |
318 | printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid)); | |
319 | ||
320 | gdb_flush (gdb_stdout); | |
321 | } | |
322 | ||
323 | if (!after_fork) | |
324 | attach (pid); | |
325 | else | |
326 | REQUIRE_ATTACH (pid); | |
327 | ||
328 | inferior_pid = pid; | |
329 | push_target (&child_ops); | |
330 | } | |
331 | #endif /* ATTACH_DETACH */ | |
332 | } | |
333 | ||
334 | ||
335 | /* Attach to process PID, then initialize for debugging it. */ | |
336 | ||
337 | static void | |
338 | child_attach (args, from_tty) | |
339 | char *args; | |
340 | int from_tty; | |
341 | { | |
342 | child_attach_to_process (args, from_tty, 0); | |
343 | } | |
344 | ||
345 | #if !defined(CHILD_POST_ATTACH) | |
346 | void | |
347 | child_post_attach (pid) | |
348 | int pid; | |
349 | { | |
350 | /* This version of Unix doesn't require a meaningful "post attach" | |
351 | operation by a debugger. */ | |
352 | } | |
353 | #endif | |
354 | ||
355 | static void | |
356 | child_require_attach (args, from_tty) | |
357 | char *args; | |
358 | int from_tty; | |
359 | { | |
360 | child_attach_to_process (args, from_tty, 1); | |
361 | } | |
362 | ||
363 | static void | |
364 | child_detach_from_process (pid, args, from_tty, after_fork) | |
365 | int pid; | |
366 | char * args; | |
367 | int from_tty; | |
368 | int after_fork; | |
369 | { | |
370 | #ifdef ATTACH_DETACH | |
371 | { | |
372 | int siggnal = 0; | |
373 | ||
374 | if (from_tty) | |
375 | { | |
376 | char *exec_file = get_exec_file (0); | |
377 | if (exec_file == 0) | |
378 | exec_file = ""; | |
379 | if (after_fork) | |
380 | printf_unfiltered ("Detaching after fork from %s\n", | |
381 | target_pid_to_str (pid)); | |
382 | else | |
383 | printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, | |
384 | target_pid_to_str (pid)); | |
385 | gdb_flush (gdb_stdout); | |
386 | } | |
387 | if (args) | |
388 | siggnal = atoi (args); | |
389 | ||
390 | if (!after_fork) | |
391 | detach (siggnal); | |
392 | else | |
393 | REQUIRE_DETACH (pid, siggnal); | |
394 | } | |
395 | #else | |
396 | error ("This version of Unix does not support detaching a process."); | |
397 | #endif | |
398 | } | |
399 | ||
400 | /* Take a program previously attached to and detaches it. | |
401 | The program resumes execution and will no longer stop | |
402 | on signals, etc. We'd better not have left any breakpoints | |
403 | in the program or it'll die when it hits one. For this | |
404 | to work, it may be necessary for the process to have been | |
405 | previously attached. It *might* work if the program was | |
406 | started via the normal ptrace (PTRACE_TRACEME). */ | |
407 | ||
408 | static void | |
409 | child_detach (args, from_tty) | |
410 | char *args; | |
411 | int from_tty; | |
412 | { | |
413 | child_detach_from_process (inferior_pid, args, from_tty, 0); | |
414 | inferior_pid = 0; | |
415 | unpush_target (&child_ops); | |
416 | } | |
417 | ||
418 | static void | |
419 | child_require_detach (pid, args, from_tty) | |
420 | int pid; | |
421 | char * args; | |
422 | int from_tty; | |
423 | { | |
424 | child_detach_from_process (pid, args, from_tty, 1); | |
425 | } | |
426 | ||
427 | ||
428 | /* Get ready to modify the registers array. On machines which store | |
429 | individual registers, this doesn't need to do anything. On machines | |
430 | which store all the registers in one fell swoop, this makes sure | |
431 | that registers contains all the registers from the program being | |
432 | debugged. */ | |
433 | ||
434 | static void | |
435 | child_prepare_to_store () | |
436 | { | |
437 | #ifdef CHILD_PREPARE_TO_STORE | |
438 | CHILD_PREPARE_TO_STORE (); | |
439 | #endif | |
440 | } | |
441 | ||
442 | /* Print status information about what we're accessing. */ | |
443 | ||
444 | static void | |
445 | child_files_info (ignore) | |
446 | struct target_ops *ignore; | |
447 | { | |
448 | printf_unfiltered ("\tUsing the running image of %s %s.\n", | |
449 | attach_flag? "attached": "child", target_pid_to_str (inferior_pid)); | |
450 | } | |
451 | ||
452 | /* ARGSUSED */ | |
453 | static void | |
454 | child_open (arg, from_tty) | |
455 | char *arg; | |
456 | int from_tty; | |
457 | { | |
458 | error ("Use the \"run\" command to start a Unix child process."); | |
459 | } | |
460 | ||
461 | /* Stub function which causes the inferior that runs it, to be ptrace-able | |
462 | by its parent process. */ | |
463 | ||
464 | static void | |
465 | ptrace_me () | |
466 | { | |
467 | /* "Trace me, Dr. Memory!" */ | |
468 | call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); | |
469 | } | |
470 | ||
471 | /* Stub function which causes the GDB that runs it, to start ptrace-ing | |
472 | the child process. */ | |
473 | ||
474 | static void | |
475 | ptrace_him (pid) | |
476 | int pid; | |
477 | { | |
478 | push_target (&child_ops); | |
479 | ||
480 | /* On some targets, there must be some explicit synchronization | |
481 | between the parent and child processes after the debugger | |
482 | forks, and before the child execs the debuggee program. This | |
483 | call basically gives permission for the child to exec. | |
484 | */ | |
485 | ||
486 | target_acknowledge_created_inferior (pid); | |
487 | ||
488 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, | |
489 | * and will be 1 or 2 depending on whether we're starting | |
490 | * without or with a shell. | |
491 | */ | |
492 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
493 | ||
494 | /* On some targets, there must be some explicit actions taken after | |
495 | the inferior has been started up. | |
496 | */ | |
497 | target_post_startup_inferior (pid); | |
498 | } | |
499 | ||
500 | /* Start an inferior Unix child process and sets inferior_pid to its pid. | |
501 | EXEC_FILE is the file to run. | |
502 | ALLARGS is a string containing the arguments to the program. | |
503 | ENV is the environment vector to pass. Errors reported with error(). */ | |
504 | ||
505 | static void | |
506 | child_create_inferior (exec_file, allargs, env) | |
507 | char *exec_file; | |
508 | char *allargs; | |
509 | char **env; | |
510 | { | |
511 | ||
512 | #ifdef HPUXHPPA | |
513 | char *tryname; | |
514 | char *shell_file; | |
515 | char *p; | |
516 | char *p1; | |
517 | char *path = getenv ("PATH"); | |
518 | int len; | |
519 | struct stat statbuf; | |
520 | ||
521 | /* On HP-UX, we have a possible bad interaction between | |
522 | * the start-up-with-shell code and our catch-fork/catch-exec | |
523 | * logic. To avoid the bad interaction, we start up with the | |
524 | * C shell ("csh") and pass it the "-f" flag (fast start-up, | |
525 | * don't run .cshrc code). | |
526 | * See further comments in inferior.h toward the bottom | |
527 | * (STARTUP_WITH_SHELL flag) and in fork-child.c | |
528 | */ | |
529 | ||
530 | /* Rather than passing in a hard-wired path like "/bin/csh", | |
531 | * we look down the PATH to find csh. I took this code from | |
532 | * procfs.c, which is the file in the Sun-specific part of GDB | |
533 | * analogous to inftarg.c. See procfs.c for more detailed | |
534 | * comments. - RT | |
535 | */ | |
536 | shell_file = "csh"; | |
537 | if (path == NULL) | |
538 | path = "/bin:/usr/bin"; | |
539 | tryname = alloca (strlen (path) + strlen (shell_file) + 2); | |
540 | for (p = path; p != NULL; p = p1 ? p1 + 1: NULL) | |
541 | { | |
542 | p1 = strchr (p, ':'); | |
543 | if (p1 != NULL) | |
544 | len = p1 - p; | |
545 | else | |
546 | len = strlen (p); | |
547 | strncpy (tryname, p, len); | |
548 | tryname[len] = '\0'; | |
549 | strcat (tryname, "/"); | |
550 | strcat (tryname, shell_file); | |
551 | if (access (tryname, X_OK) < 0) | |
552 | continue; | |
553 | if (stat (tryname, &statbuf) < 0) | |
554 | continue; | |
555 | if (!S_ISREG (statbuf.st_mode)) | |
556 | /* We certainly need to reject directories. I'm not quite | |
557 | as sure about FIFOs, sockets, etc., but I kind of doubt | |
558 | that people want to exec() these things. */ | |
559 | continue; | |
560 | break; | |
561 | } | |
562 | if (p == NULL) | |
563 | /* Not found. I replaced the error() which existed in procfs.c | |
564 | * with simply passing in NULL and hoping fork_inferior() | |
565 | * can deal with it. - RT | |
566 | */ | |
567 | /* error ("Can't find shell %s in PATH", shell_file); */ | |
568 | shell_file = NULL; | |
569 | else | |
570 | shell_file = tryname; | |
571 | ||
572 | fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL); | |
573 | #else | |
574 | fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL); | |
575 | #endif | |
576 | /* We are at the first instruction we care about. */ | |
577 | /* Pedal to the metal... */ | |
578 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); | |
579 | } | |
580 | ||
581 | #if !defined(CHILD_POST_STARTUP_INFERIOR) | |
582 | void | |
583 | child_post_startup_inferior (pid) | |
584 | int pid; | |
585 | { | |
586 | /* This version of Unix doesn't require a meaningful "post startup inferior" | |
587 | operation by a debugger. | |
588 | */ | |
589 | } | |
590 | #endif | |
591 | ||
592 | #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR) | |
593 | void | |
594 | child_acknowledge_created_inferior (pid) | |
595 | int pid; | |
596 | { | |
597 | /* This version of Unix doesn't require a meaningful "acknowledge created inferior" | |
598 | operation by a debugger. | |
599 | */ | |
600 | } | |
601 | #endif | |
602 | ||
603 | ||
604 | void | |
605 | child_clone_and_follow_inferior (child_pid, followed_child) | |
606 | int child_pid; | |
607 | int *followed_child; | |
608 | { | |
609 | clone_and_follow_inferior (child_pid, followed_child); | |
610 | ||
611 | /* Don't resume CHILD_PID; it's stopped where it ought to be, until | |
612 | the decision gets made elsewhere how to continue it. | |
613 | */ | |
614 | } | |
615 | ||
616 | ||
617 | #if !defined(CHILD_POST_FOLLOW_INFERIOR_BY_CLONE) | |
618 | void | |
619 | child_post_follow_inferior_by_clone () | |
620 | { | |
621 | /* This version of Unix doesn't require a meaningful "post follow inferior" | |
622 | operation by a clone debugger. | |
623 | */ | |
624 | } | |
625 | #endif | |
626 | ||
627 | #if !defined(CHILD_INSERT_FORK_CATCHPOINT) | |
628 | int | |
629 | child_insert_fork_catchpoint (pid) | |
630 | int pid; | |
631 | { | |
632 | /* This version of Unix doesn't support notification of fork events. */ | |
633 | return 0; | |
634 | } | |
635 | #endif | |
636 | ||
637 | #if !defined(CHILD_REMOVE_FORK_CATCHPOINT) | |
638 | int | |
639 | child_remove_fork_catchpoint (pid) | |
640 | int pid; | |
641 | { | |
642 | /* This version of Unix doesn't support notification of fork events. */ | |
643 | return 0; | |
644 | } | |
645 | #endif | |
646 | ||
647 | #if !defined(CHILD_INSERT_VFORK_CATCHPOINT) | |
648 | int | |
649 | child_insert_vfork_catchpoint (pid) | |
650 | int pid; | |
651 | { | |
652 | /* This version of Unix doesn't support notification of vfork events. */ | |
653 | return 0; | |
654 | } | |
655 | #endif | |
656 | ||
657 | #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT) | |
658 | int | |
659 | child_remove_vfork_catchpoint (pid) | |
660 | int pid; | |
661 | { | |
662 | /* This version of Unix doesn't support notification of vfork events. */ | |
663 | return 0; | |
664 | } | |
665 | #endif | |
666 | ||
667 | #if !defined(CHILD_HAS_FORKED) | |
668 | int | |
669 | child_has_forked (pid, child_pid) | |
670 | int pid; | |
671 | int *child_pid; | |
672 | { | |
673 | /* This version of Unix doesn't support notification of fork events. */ | |
674 | return 0; | |
675 | } | |
676 | #endif | |
677 | ||
678 | ||
679 | #if !defined(CHILD_HAS_VFORKED) | |
680 | int | |
681 | child_has_vforked (pid, child_pid) | |
682 | int pid; | |
683 | int * child_pid; | |
684 | { | |
685 | /* This version of Unix doesn't support notification of vfork events. | |
686 | */ | |
687 | return 0; | |
688 | } | |
689 | #endif | |
690 | ||
691 | ||
692 | #if !defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC) | |
693 | int | |
694 | child_can_follow_vfork_prior_to_exec () | |
695 | { | |
696 | /* This version of Unix doesn't support notification of vfork events. | |
697 | However, if it did, it probably wouldn't allow vforks to be followed | |
698 | before the following exec. | |
699 | */ | |
700 | return 0; | |
701 | } | |
702 | #endif | |
703 | ||
704 | ||
705 | #if !defined(CHILD_POST_FOLLOW_VFORK) | |
706 | void | |
707 | child_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child) | |
708 | int parent_pid; | |
709 | int followed_parent; | |
710 | int child_pid; | |
711 | int followed_child; | |
712 | { | |
713 | /* This version of Unix doesn't require a meaningful "post follow vfork" | |
714 | operation by a clone debugger. | |
715 | */ | |
716 | } | |
717 | #endif | |
718 | ||
719 | #if !defined(CHILD_INSERT_EXEC_CATCHPOINT) | |
720 | int | |
721 | child_insert_exec_catchpoint (pid) | |
722 | int pid; | |
723 | { | |
724 | /* This version of Unix doesn't support notification of exec events. */ | |
725 | return 0; | |
726 | } | |
727 | #endif | |
728 | ||
729 | #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT) | |
730 | int | |
731 | child_remove_exec_catchpoint (pid) | |
732 | int pid; | |
733 | { | |
734 | /* This version of Unix doesn't support notification of exec events. */ | |
735 | return 0; | |
736 | } | |
737 | #endif | |
738 | ||
739 | #if !defined(CHILD_HAS_EXECD) | |
740 | int | |
741 | child_has_execd (pid, execd_pathname) | |
742 | int pid; | |
743 | char ** execd_pathname; | |
744 | { | |
745 | /* This version of Unix doesn't support notification of exec events. | |
746 | */ | |
747 | return 0; | |
748 | } | |
749 | #endif | |
750 | ||
751 | ||
752 | #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) | |
753 | int | |
754 | child_reported_exec_events_per_exec_call () | |
755 | { | |
756 | /* This version of Unix doesn't support notification of exec events. | |
757 | */ | |
758 | return 1; | |
759 | } | |
760 | #endif | |
761 | ||
762 | ||
763 | #if !defined(CHILD_HAS_SYSCALL_EVENT) | |
764 | int | |
765 | child_has_syscall_event (pid, kind, syscall_id) | |
766 | int pid; | |
767 | enum target_waitkind * kind; | |
768 | int * syscall_id; | |
769 | { | |
770 | /* This version of Unix doesn't support notification of syscall events. | |
771 | */ | |
772 | return 0; | |
773 | } | |
774 | #endif | |
775 | ||
776 | ||
777 | #if !defined(CHILD_HAS_EXITED) | |
778 | int | |
779 | child_has_exited (pid, wait_status, exit_status) | |
780 | int pid; | |
781 | int wait_status; | |
782 | int * exit_status; | |
783 | { | |
784 | if (WIFEXITED (wait_status)) | |
785 | { | |
786 | *exit_status = WEXITSTATUS (wait_status); | |
787 | return 1; | |
788 | } | |
789 | ||
790 | if (WIFSIGNALED (wait_status)) | |
791 | { | |
792 | *exit_status = 0; /* ?? Don't know what else to say here. */ | |
793 | return 1; | |
794 | } | |
795 | ||
796 | /* ?? Do we really need to consult the event state, too? Assume the | |
797 | wait_state alone suffices. | |
798 | */ | |
799 | return 0; | |
800 | } | |
801 | #endif | |
802 | ||
803 | ||
804 | static void | |
805 | child_mourn_inferior () | |
806 | { | |
807 | /* FIXME: Should be in a header file */ | |
808 | extern void proc_remove_foreign PARAMS ((int)); | |
809 | ||
810 | unpush_target (&child_ops); | |
811 | proc_remove_foreign (inferior_pid); | |
812 | generic_mourn_inferior (); | |
813 | } | |
814 | ||
815 | static int | |
816 | child_can_run () | |
817 | { | |
818 | /* This variable is controlled by modules that sit atop inftarg that may layer | |
819 | their own process structure atop that provided here. hpux-thread.c does | |
820 | this because of the Hpux user-mode level thread model. */ | |
821 | ||
822 | return !child_suppress_run; | |
823 | } | |
824 | ||
825 | /* Send a SIGINT to the process group. This acts just like the user typed a | |
826 | ^C on the controlling terminal. | |
827 | ||
828 | XXX - This may not be correct for all systems. Some may want to use | |
829 | killpg() instead of kill (-pgrp). */ | |
830 | ||
831 | static void | |
832 | child_stop () | |
833 | { | |
834 | extern pid_t inferior_process_group; | |
835 | ||
836 | kill (-inferior_process_group, SIGINT); | |
837 | } | |
838 | ||
839 | #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK) | |
840 | struct symtab_and_line * | |
841 | child_enable_exception_callback (kind, enable) | |
842 | enum exception_event_kind kind; | |
843 | int enable; | |
844 | { | |
845 | return (struct symtab_and_line *) NULL; | |
846 | } | |
847 | #endif | |
848 | ||
849 | #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT) | |
850 | struct exception_event_record * | |
851 | child_get_current_exception_event () | |
852 | { | |
853 | return (struct exception_event_record *) NULL; | |
854 | } | |
855 | #endif | |
856 | ||
857 | ||
858 | #if !defined(CHILD_PID_TO_EXEC_FILE) | |
859 | char * | |
860 | child_pid_to_exec_file (pid) | |
861 | int pid; | |
862 | { | |
863 | /* This version of Unix doesn't support translation of a process ID | |
864 | to the filename of the executable file. | |
865 | */ | |
866 | return NULL; | |
867 | } | |
868 | #endif | |
869 | ||
870 | char * | |
871 | child_core_file_to_sym_file (core) | |
872 | char * core; | |
873 | { | |
874 | /* The target stratum for a running executable need not support | |
875 | this operation. | |
876 | */ | |
877 | return NULL; | |
878 | } | |
879 | ||
880 | ||
881 | \f | |
882 | static void | |
883 | init_child_ops () | |
884 | { | |
885 | child_ops.to_shortname = "child"; | |
886 | child_ops.to_longname = "Unix child process"; | |
887 | child_ops.to_doc = "Unix child process (started by the \"run\" command)."; | |
888 | child_ops.to_open = child_open; | |
889 | child_ops.to_attach = child_attach; | |
890 | child_ops.to_post_attach = child_post_attach; | |
891 | child_ops.to_require_attach = child_require_attach; | |
892 | child_ops.to_detach = child_detach; | |
893 | child_ops.to_require_detach = child_require_detach; | |
894 | child_ops.to_resume = child_resume; | |
895 | child_ops.to_wait = child_wait; | |
896 | child_ops.to_post_wait = child_post_wait; | |
897 | child_ops.to_fetch_registers = fetch_inferior_registers; | |
898 | child_ops.to_store_registers = store_inferior_registers; | |
899 | child_ops.to_prepare_to_store = child_prepare_to_store; | |
900 | child_ops.to_xfer_memory = child_xfer_memory; | |
901 | child_ops.to_files_info = child_files_info; | |
902 | child_ops.to_insert_breakpoint = memory_insert_breakpoint; | |
903 | child_ops.to_remove_breakpoint = memory_remove_breakpoint; | |
904 | child_ops.to_terminal_init = terminal_init_inferior; | |
905 | child_ops.to_terminal_inferior = terminal_inferior; | |
906 | child_ops.to_terminal_ours_for_output = terminal_ours_for_output; | |
907 | child_ops.to_terminal_ours = terminal_ours; | |
908 | child_ops.to_terminal_info = child_terminal_info; | |
909 | child_ops.to_kill = kill_inferior; | |
910 | child_ops.to_create_inferior = child_create_inferior; | |
911 | child_ops.to_post_startup_inferior = child_post_startup_inferior; | |
912 | child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior; | |
913 | child_ops.to_clone_and_follow_inferior = child_clone_and_follow_inferior; | |
914 | child_ops.to_post_follow_inferior_by_clone = child_post_follow_inferior_by_clone; | |
915 | child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
916 | child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint; | |
917 | child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
918 | child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint; | |
919 | child_ops.to_has_forked = child_has_forked; | |
920 | child_ops.to_has_vforked = child_has_vforked; | |
921 | child_ops.to_can_follow_vfork_prior_to_exec = child_can_follow_vfork_prior_to_exec; | |
922 | child_ops.to_post_follow_vfork = child_post_follow_vfork; | |
923 | child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
924 | child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint; | |
925 | child_ops.to_has_execd = child_has_execd; | |
926 | child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call; | |
927 | child_ops.to_has_syscall_event = child_has_syscall_event; | |
928 | child_ops.to_has_exited = child_has_exited; | |
929 | child_ops.to_mourn_inferior = child_mourn_inferior; | |
930 | child_ops.to_can_run = child_can_run; | |
931 | child_ops.to_thread_alive = child_thread_alive; | |
932 | child_ops.to_stop = child_stop; | |
933 | child_ops.to_enable_exception_callback = child_enable_exception_callback; | |
934 | child_ops.to_get_current_exception_event = child_get_current_exception_event; | |
935 | child_ops.to_pid_to_exec_file = child_pid_to_exec_file; | |
936 | child_ops.to_core_file_to_sym_file = child_core_file_to_sym_file; | |
937 | child_ops.to_stratum = process_stratum; | |
938 | child_ops.to_has_all_memory = 1; | |
939 | child_ops.to_has_memory = 1; | |
940 | child_ops.to_has_stack = 1; | |
941 | child_ops.to_has_registers = 1; | |
942 | child_ops.to_has_execution = 1; | |
943 | child_ops.to_magic = OPS_MAGIC; | |
944 | } | |
945 | ||
946 | void | |
947 | _initialize_inftarg () | |
948 | { | |
949 | #ifdef HAVE_OPTIONAL_PROC_FS | |
950 | char procname[32]; | |
951 | int fd; | |
952 | ||
953 | /* If we have an optional /proc filesystem (e.g. under OSF/1), | |
954 | don't add ptrace support if we can access the running GDB via /proc. */ | |
955 | #ifndef PROC_NAME_FMT | |
956 | #define PROC_NAME_FMT "/proc/%05d" | |
957 | #endif | |
958 | sprintf (procname, PROC_NAME_FMT, getpid ()); | |
959 | if ((fd = open (procname, O_RDONLY)) >= 0) | |
960 | { | |
961 | close (fd); | |
962 | return; | |
963 | } | |
964 | #endif | |
965 | ||
966 | init_child_ops (); | |
967 | add_target (&child_ops); | |
968 | } |