1 /* Target-vector operations for controlling Unix child processes, for GDB.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
4 Free Software Foundation, Inc.
5 Contributed by Cygnus Support.
7 ## Contains temporary hacks..
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA. */
27 #include "frame.h" /* required by inferior.h */
34 #include <sys/types.h>
39 extern struct symtab_and_line *child_enable_exception_callback (enum
43 extern struct exception_event_record
44 *child_get_current_exception_event (void);
46 extern void _initialize_inftarg (void);
48 static void child_prepare_to_store (void);
51 static ptid_t child_wait (ptid_t, struct target_waitstatus *);
52 #endif /* CHILD_WAIT */
54 #if !defined(CHILD_POST_WAIT)
55 void child_post_wait (ptid_t, int);
58 static void child_open (char *, int);
60 static void child_files_info (struct target_ops *);
62 static void child_detach (char *, int);
64 static void child_detach_from_process (int, char *, int, int);
66 static void child_attach (char *, int);
68 static void child_attach_to_process (char *, int, int);
70 #if !defined(CHILD_POST_ATTACH)
71 extern void child_post_attach (int);
74 static void child_require_attach (char *, int);
76 static void child_require_detach (int, char *, int);
78 static void ptrace_me (void);
80 static void ptrace_him (int);
82 static void child_create_inferior (char *, char *, char **);
84 static void child_mourn_inferior (void);
86 static int child_can_run (void);
88 static void child_stop (void);
90 #ifndef CHILD_THREAD_ALIVE
91 int child_thread_alive (ptid_t);
94 static void init_child_ops (void);
96 extern char **environ;
98 struct target_ops child_ops;
100 int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to
101 be a runnable target. Used by targets
102 that can sit atop inftarg, such as HPUX
108 /* Enable HACK for ttrace work. In
109 * infttrace.c/require_notification_of_events,
110 * this is set to 0 so that the loop in child_wait
113 int not_same_real_pid = 1;
117 /* Wait for child to do something. Return pid of child, or -1 in case
118 of error; store status through argument pointer OURSTATUS. */
121 child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
125 char *execd_pathname = NULL;
129 enum target_waitkind kind;
134 set_sigint_trap (); /* Causes SIGINT to be passed on to the
138 pid = ptrace_wait (inferior_ptid, &status);
144 clear_sigint_trap ();
148 if (save_errno == EINTR)
151 fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
152 safe_strerror (save_errno));
154 /* Claim it exited with unknown signal. */
155 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
156 ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
157 return pid_to_ptid (-1);
162 if (target_has_exited (pid, status, &exit_status))
164 /* ??rehrauer: For now, ignore this. */
168 if (!target_thread_alive (pid_to_ptid (pid)))
170 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
171 return pid_to_ptid (pid);
174 if (target_has_forked (pid, &related_pid)
175 && ((pid == PIDGET (inferior_ptid))
176 || (related_pid == PIDGET (inferior_ptid))))
178 ourstatus->kind = TARGET_WAITKIND_FORKED;
179 ourstatus->value.related_pid = related_pid;
180 return pid_to_ptid (pid);
183 if (target_has_vforked (pid, &related_pid)
184 && ((pid == PIDGET (inferior_ptid))
185 || (related_pid == PIDGET (inferior_ptid))))
187 ourstatus->kind = TARGET_WAITKIND_VFORKED;
188 ourstatus->value.related_pid = related_pid;
189 return pid_to_ptid (pid);
192 if (target_has_execd (pid, &execd_pathname))
194 /* Are we ignoring initial exec events? (This is likely because
195 we're in the process of starting up the inferior, and another
196 (older) mechanism handles those.) If so, we'll report this
197 as a regular stop, not an exec.
199 if (inferior_ignoring_startup_exec_events)
201 inferior_ignoring_startup_exec_events--;
205 ourstatus->kind = TARGET_WAITKIND_EXECD;
206 ourstatus->value.execd_pathname = execd_pathname;
207 return pid_to_ptid (pid);
211 /* All we must do with these is communicate their occurrence
212 to wait_for_inferior...
214 if (target_has_syscall_event (pid, &kind, &syscall_id))
216 ourstatus->kind = kind;
217 ourstatus->value.syscall_id = syscall_id;
218 return pid_to_ptid (pid);
221 /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */
222 /* hack for thread testing */
224 while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid);
227 store_waitstatus (ourstatus, status);
228 return pid_to_ptid (pid);
230 #endif /* CHILD_WAIT */
232 #if !defined(CHILD_POST_WAIT)
234 child_post_wait (ptid_t ptid, int wait_status)
236 /* This version of Unix doesn't require a meaningful "post wait"
243 #ifndef CHILD_THREAD_ALIVE
245 /* Check to see if the given thread is alive.
247 FIXME: Is kill() ever the right way to do this? I doubt it, but
248 for now we're going to try and be compatable with the old thread
251 child_thread_alive (ptid_t ptid)
253 pid_t pid = PIDGET (ptid);
255 return (kill (pid, 0) != -1);
261 child_attach_to_process (char *args, int from_tty, int after_fork)
264 error_no_arg ("process-id to attach");
266 #ifndef ATTACH_DETACH
267 error ("Can't attach to a process on this machine.");
275 pid = strtol (args, &dummy, 0);
276 /* Some targets don't set errno on errors, grrr! */
277 if ((pid == 0) && (args == dummy))
278 error ("Illegal process-id: %s\n", args);
280 if (pid == getpid ()) /* Trying to masturbate? */
281 error ("I refuse to debug myself!");
285 exec_file = (char *) get_exec_file (0);
288 printf_unfiltered ("Attaching after fork to %s\n",
289 target_pid_to_str (pid_to_ptid (pid)));
291 printf_unfiltered ("Attaching to program: %s, %s\n", exec_file,
292 target_pid_to_str (pid_to_ptid (pid)));
294 printf_unfiltered ("Attaching to %s\n",
295 target_pid_to_str (pid_to_ptid (pid)));
297 gdb_flush (gdb_stdout);
303 REQUIRE_ATTACH (pid);
305 inferior_ptid = pid_to_ptid (pid);
306 push_target (&child_ops);
308 #endif /* ATTACH_DETACH */
312 /* Attach to process PID, then initialize for debugging it. */
315 child_attach (char *args, int from_tty)
317 child_attach_to_process (args, from_tty, 0);
320 #if !defined(CHILD_POST_ATTACH)
322 child_post_attach (int pid)
324 /* This version of Unix doesn't require a meaningful "post attach"
325 operation by a debugger. */
330 child_require_attach (char *args, int from_tty)
332 child_attach_to_process (args, from_tty, 1);
336 child_detach_from_process (int pid, char *args, int from_tty, int after_fork)
344 char *exec_file = get_exec_file (0);
348 printf_unfiltered ("Detaching after fork from %s\n",
349 target_pid_to_str (pid_to_ptid (pid)));
351 printf_unfiltered ("Detaching from program: %s, %s\n", exec_file,
352 target_pid_to_str (pid_to_ptid (pid)));
353 gdb_flush (gdb_stdout);
356 siggnal = atoi (args);
361 REQUIRE_DETACH (pid, siggnal);
364 error ("This version of Unix does not support detaching a process.");
368 /* Take a program previously attached to and detaches it.
369 The program resumes execution and will no longer stop
370 on signals, etc. We'd better not have left any breakpoints
371 in the program or it'll die when it hits one. For this
372 to work, it may be necessary for the process to have been
373 previously attached. It *might* work if the program was
374 started via the normal ptrace (PTRACE_TRACEME). */
377 child_detach (char *args, int from_tty)
379 child_detach_from_process (PIDGET (inferior_ptid), args, from_tty, 0);
380 inferior_ptid = null_ptid;
381 unpush_target (&child_ops);
385 child_require_detach (int pid, char *args, int from_tty)
387 child_detach_from_process (pid, args, from_tty, 1);
391 /* Get ready to modify the registers array. On machines which store
392 individual registers, this doesn't need to do anything. On machines
393 which store all the registers in one fell swoop, this makes sure
394 that registers contains all the registers from the program being
398 child_prepare_to_store (void)
400 #ifdef CHILD_PREPARE_TO_STORE
401 CHILD_PREPARE_TO_STORE ();
405 /* Print status information about what we're accessing. */
408 child_files_info (struct target_ops *ignore)
410 printf_unfiltered ("\tUsing the running image of %s %s.\n",
411 attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid));
416 child_open (char *arg, int from_tty)
418 error ("Use the \"run\" command to start a Unix child process.");
421 /* Stub function which causes the inferior that runs it, to be ptrace-able
422 by its parent process. */
427 /* "Trace me, Dr. Memory!" */
428 call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
431 /* Stub function which causes the GDB that runs it, to start ptrace-ing
432 the child process. */
437 push_target (&child_ops);
439 /* On some targets, there must be some explicit synchronization
440 between the parent and child processes after the debugger
441 forks, and before the child execs the debuggee program. This
442 call basically gives permission for the child to exec.
445 target_acknowledge_created_inferior (pid);
447 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
448 * and will be 1 or 2 depending on whether we're starting
449 * without or with a shell.
451 startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
453 /* On some targets, there must be some explicit actions taken after
454 the inferior has been started up.
456 target_post_startup_inferior (pid_to_ptid (pid));
459 /* Start an inferior Unix child process and sets inferior_ptid to its pid.
460 EXEC_FILE is the file to run.
461 ALLARGS is a string containing the arguments to the program.
462 ENV is the environment vector to pass. Errors reported with error(). */
465 child_create_inferior (char *exec_file, char *allargs, char **env)
468 fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL);
470 fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
472 /* We are at the first instruction we care about. */
473 /* Pedal to the metal... */
474 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
477 #if !defined(CHILD_POST_STARTUP_INFERIOR)
479 child_post_startup_inferior (ptid_t ptid)
481 /* This version of Unix doesn't require a meaningful "post startup inferior"
482 operation by a debugger.
487 #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
489 child_acknowledge_created_inferior (int pid)
491 /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
492 operation by a debugger.
499 child_clone_and_follow_inferior (int child_pid, int *followed_child)
501 clone_and_follow_inferior (child_pid, followed_child);
503 /* Don't resume CHILD_PID; it's stopped where it ought to be, until
504 the decision gets made elsewhere how to continue it.
509 #if !defined(CHILD_POST_FOLLOW_INFERIOR_BY_CLONE)
511 child_post_follow_inferior_by_clone (void)
513 /* This version of Unix doesn't require a meaningful "post follow inferior"
514 operation by a clone debugger.
519 #if !defined(CHILD_INSERT_FORK_CATCHPOINT)
521 child_insert_fork_catchpoint (int pid)
523 /* This version of Unix doesn't support notification of fork events. */
528 #if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
530 child_remove_fork_catchpoint (int pid)
532 /* This version of Unix doesn't support notification of fork events. */
537 #if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
539 child_insert_vfork_catchpoint (int pid)
541 /* This version of Unix doesn't support notification of vfork events. */
546 #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
548 child_remove_vfork_catchpoint (int pid)
550 /* This version of Unix doesn't support notification of vfork events. */
555 #if !defined(CHILD_HAS_FORKED)
557 child_has_forked (int pid, int *child_pid)
559 /* This version of Unix doesn't support notification of fork events. */
565 #if !defined(CHILD_HAS_VFORKED)
567 child_has_vforked (int pid, int *child_pid)
569 /* This version of Unix doesn't support notification of vfork events.
576 #if !defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC)
578 child_can_follow_vfork_prior_to_exec (void)
580 /* This version of Unix doesn't support notification of vfork events.
581 However, if it did, it probably wouldn't allow vforks to be followed
582 before the following exec.
589 #if !defined(CHILD_POST_FOLLOW_VFORK)
591 child_post_follow_vfork (int parent_pid, int followed_parent, int child_pid,
594 /* This version of Unix doesn't require a meaningful "post follow vfork"
595 operation by a clone debugger.
600 #if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
602 child_insert_exec_catchpoint (int pid)
604 /* This version of Unix doesn't support notification of exec events. */
609 #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
611 child_remove_exec_catchpoint (int pid)
613 /* This version of Unix doesn't support notification of exec events. */
618 #if !defined(CHILD_HAS_EXECD)
620 child_has_execd (int pid, char **execd_pathname)
622 /* This version of Unix doesn't support notification of exec events.
629 #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
631 child_reported_exec_events_per_exec_call (void)
633 /* This version of Unix doesn't support notification of exec events.
640 #if !defined(CHILD_HAS_SYSCALL_EVENT)
642 child_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id)
644 /* This version of Unix doesn't support notification of syscall events.
651 #if !defined(CHILD_HAS_EXITED)
653 child_has_exited (int pid, int wait_status, int *exit_status)
655 if (WIFEXITED (wait_status))
657 *exit_status = WEXITSTATUS (wait_status);
661 if (WIFSIGNALED (wait_status))
663 *exit_status = 0; /* ?? Don't know what else to say here. */
667 /* ?? Do we really need to consult the event state, too? Assume the
668 wait_state alone suffices.
676 child_mourn_inferior (void)
678 unpush_target (&child_ops);
679 generic_mourn_inferior ();
685 /* This variable is controlled by modules that sit atop inftarg that may layer
686 their own process structure atop that provided here. hpux-thread.c does
687 this because of the Hpux user-mode level thread model. */
689 return !child_suppress_run;
692 /* Send a SIGINT to the process group. This acts just like the user typed a
693 ^C on the controlling terminal.
695 XXX - This may not be correct for all systems. Some may want to use
696 killpg() instead of kill (-pgrp). */
701 extern pid_t inferior_process_group;
703 kill (-inferior_process_group, SIGINT);
706 #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
707 struct symtab_and_line *
708 child_enable_exception_callback (enum exception_event_kind kind, int enable)
710 return (struct symtab_and_line *) NULL;
714 #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
715 struct exception_event_record *
716 child_get_current_exception_event (void)
718 return (struct exception_event_record *) NULL;
723 #if !defined(CHILD_PID_TO_EXEC_FILE)
725 child_pid_to_exec_file (int pid)
727 /* This version of Unix doesn't support translation of a process ID
728 to the filename of the executable file.
735 child_core_file_to_sym_file (char *core)
737 /* The target stratum for a running executable need not support
744 #if !defined(CHILD_PID_TO_STR)
746 child_pid_to_str (ptid_t ptid)
748 return normal_pid_to_str (ptid);
753 init_child_ops (void)
755 child_ops.to_shortname = "child";
756 child_ops.to_longname = "Unix child process";
757 child_ops.to_doc = "Unix child process (started by the \"run\" command).";
758 child_ops.to_open = child_open;
759 child_ops.to_attach = child_attach;
760 child_ops.to_post_attach = child_post_attach;
761 child_ops.to_require_attach = child_require_attach;
762 child_ops.to_detach = child_detach;
763 child_ops.to_require_detach = child_require_detach;
764 child_ops.to_resume = child_resume;
765 child_ops.to_wait = child_wait;
766 child_ops.to_post_wait = child_post_wait;
767 child_ops.to_fetch_registers = fetch_inferior_registers;
768 child_ops.to_store_registers = store_inferior_registers;
769 child_ops.to_prepare_to_store = child_prepare_to_store;
770 child_ops.to_xfer_memory = child_xfer_memory;
771 child_ops.to_files_info = child_files_info;
772 child_ops.to_insert_breakpoint = memory_insert_breakpoint;
773 child_ops.to_remove_breakpoint = memory_remove_breakpoint;
774 child_ops.to_terminal_init = terminal_init_inferior;
775 child_ops.to_terminal_inferior = terminal_inferior;
776 child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
777 child_ops.to_terminal_ours = terminal_ours;
778 child_ops.to_terminal_info = child_terminal_info;
779 child_ops.to_kill = kill_inferior;
780 child_ops.to_create_inferior = child_create_inferior;
781 child_ops.to_post_startup_inferior = child_post_startup_inferior;
782 child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior;
783 child_ops.to_clone_and_follow_inferior = child_clone_and_follow_inferior;
784 child_ops.to_post_follow_inferior_by_clone = child_post_follow_inferior_by_clone;
785 child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
786 child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint;
787 child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
788 child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint;
789 child_ops.to_has_forked = child_has_forked;
790 child_ops.to_has_vforked = child_has_vforked;
791 child_ops.to_can_follow_vfork_prior_to_exec = child_can_follow_vfork_prior_to_exec;
792 child_ops.to_post_follow_vfork = child_post_follow_vfork;
793 child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
794 child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint;
795 child_ops.to_has_execd = child_has_execd;
796 child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call;
797 child_ops.to_has_syscall_event = child_has_syscall_event;
798 child_ops.to_has_exited = child_has_exited;
799 child_ops.to_mourn_inferior = child_mourn_inferior;
800 child_ops.to_can_run = child_can_run;
801 child_ops.to_thread_alive = child_thread_alive;
802 child_ops.to_pid_to_str = child_pid_to_str;
803 child_ops.to_stop = child_stop;
804 child_ops.to_enable_exception_callback = child_enable_exception_callback;
805 child_ops.to_get_current_exception_event = child_get_current_exception_event;
806 child_ops.to_pid_to_exec_file = child_pid_to_exec_file;
807 child_ops.to_stratum = process_stratum;
808 child_ops.to_has_all_memory = 1;
809 child_ops.to_has_memory = 1;
810 child_ops.to_has_stack = 1;
811 child_ops.to_has_registers = 1;
812 child_ops.to_has_execution = 1;
813 child_ops.to_magic = OPS_MAGIC;
816 /* Take over the 'find_mapped_memory' vector from inftarg.c. */
818 inftarg_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
824 child_ops.to_find_memory_regions = func;
827 /* Take over the 'make_corefile_notes' vector from inftarg.c. */
829 inftarg_set_make_corefile_notes (char * (*func) (bfd *, int *))
831 child_ops.to_make_corefile_notes = func;
835 _initialize_inftarg (void)
837 #ifdef HAVE_OPTIONAL_PROC_FS
841 /* If we have an optional /proc filesystem (e.g. under OSF/1),
842 don't add ptrace support if we can access the running GDB via /proc. */
843 #ifndef PROC_NAME_FMT
844 #define PROC_NAME_FMT "/proc/%05d"
846 sprintf (procname, PROC_NAME_FMT, getpid ());
847 if ((fd = open (procname, O_RDONLY)) >= 0)
855 add_target (&child_ops);