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_attach (char *, int);
66 #if !defined(CHILD_POST_ATTACH)
67 extern void child_post_attach (int);
70 static void ptrace_me (void);
72 static void ptrace_him (int);
74 static void child_create_inferior (char *, char *, char **);
76 static void child_mourn_inferior (void);
78 static int child_can_run (void);
80 static void child_stop (void);
82 #ifndef CHILD_THREAD_ALIVE
83 int child_thread_alive (ptid_t
);
86 static void init_child_ops (void);
88 extern char **environ
;
90 struct target_ops child_ops
;
92 int child_suppress_run
= 0; /* Non-zero if inftarg should pretend not to
93 be a runnable target. Used by targets
94 that can sit atop inftarg, such as HPUX
99 /* Wait for child to do something. Return pid of child, or -1 in case
100 of error; store status through argument pointer OURSTATUS. */
103 child_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
107 char *execd_pathname
= NULL
;
111 enum target_waitkind kind
;
116 set_sigint_trap (); /* Causes SIGINT to be passed on to the
120 pid
= ptrace_wait (inferior_ptid
, &status
);
126 clear_sigint_trap ();
130 if (save_errno
== EINTR
)
133 fprintf_unfiltered (gdb_stderr
, "Child process unexpectedly missing: %s.\n",
134 safe_strerror (save_errno
));
136 /* Claim it exited with unknown signal. */
137 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
138 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
139 return pid_to_ptid (-1);
144 if (target_has_exited (pid
, status
, &exit_status
))
146 /* ??rehrauer: For now, ignore this. */
150 if (!target_thread_alive (pid_to_ptid (pid
)))
152 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
153 return pid_to_ptid (pid
);
155 } while (pid
!= PIDGET (inferior_ptid
)); /* Some other child died or stopped */
157 store_waitstatus (ourstatus
, status
);
158 return pid_to_ptid (pid
);
160 #endif /* CHILD_WAIT */
162 #if !defined(CHILD_POST_WAIT)
164 child_post_wait (ptid_t ptid
, int wait_status
)
166 /* This version of Unix doesn't require a meaningful "post wait"
173 #ifndef CHILD_THREAD_ALIVE
175 /* Check to see if the given thread is alive.
177 FIXME: Is kill() ever the right way to do this? I doubt it, but
178 for now we're going to try and be compatable with the old thread
181 child_thread_alive (ptid_t ptid
)
183 pid_t pid
= PIDGET (ptid
);
185 return (kill (pid
, 0) != -1);
190 /* Attach to process PID, then initialize for debugging it. */
193 child_attach (char *args
, int from_tty
)
196 error_no_arg ("process-id to attach");
198 #ifndef ATTACH_DETACH
199 error ("Can't attach to a process on this machine.");
207 pid
= strtol (args
, &dummy
, 0);
208 /* Some targets don't set errno on errors, grrr! */
209 if ((pid
== 0) && (args
== dummy
))
210 error ("Illegal process-id: %s\n", args
);
212 if (pid
== getpid ()) /* Trying to masturbate? */
213 error ("I refuse to debug myself!");
217 exec_file
= (char *) get_exec_file (0);
220 printf_unfiltered ("Attaching to program: %s, %s\n", exec_file
,
221 target_pid_to_str (pid_to_ptid (pid
)));
223 printf_unfiltered ("Attaching to %s\n",
224 target_pid_to_str (pid_to_ptid (pid
)));
226 gdb_flush (gdb_stdout
);
231 inferior_ptid
= pid_to_ptid (pid
);
232 push_target (&child_ops
);
234 #endif /* ATTACH_DETACH */
237 #if !defined(CHILD_POST_ATTACH)
239 child_post_attach (int pid
)
241 /* This version of Unix doesn't require a meaningful "post attach"
242 operation by a debugger. */
246 /* Take a program previously attached to and detaches it.
247 The program resumes execution and will no longer stop
248 on signals, etc. We'd better not have left any breakpoints
249 in the program or it'll die when it hits one. For this
250 to work, it may be necessary for the process to have been
251 previously attached. It *might* work if the program was
252 started via the normal ptrace (PTRACE_TRACEME). */
255 child_detach (char *args
, int from_tty
)
260 int pid
= PIDGET (inferior_ptid
);
264 char *exec_file
= get_exec_file (0);
267 printf_unfiltered ("Detaching from program: %s, %s\n", exec_file
,
268 target_pid_to_str (pid_to_ptid (pid
)));
269 gdb_flush (gdb_stdout
);
272 siggnal
= atoi (args
);
276 inferior_ptid
= null_ptid
;
277 unpush_target (&child_ops
);
280 error ("This version of Unix does not support detaching a process.");
284 /* Get ready to modify the registers array. On machines which store
285 individual registers, this doesn't need to do anything. On machines
286 which store all the registers in one fell swoop, this makes sure
287 that registers contains all the registers from the program being
291 child_prepare_to_store (void)
293 #ifdef CHILD_PREPARE_TO_STORE
294 CHILD_PREPARE_TO_STORE ();
298 /* Print status information about what we're accessing. */
301 child_files_info (struct target_ops
*ignore
)
303 printf_unfiltered ("\tUsing the running image of %s %s.\n",
304 attach_flag
? "attached" : "child", target_pid_to_str (inferior_ptid
));
309 child_open (char *arg
, int from_tty
)
311 error ("Use the \"run\" command to start a Unix child process.");
314 /* Stub function which causes the inferior that runs it, to be ptrace-able
315 by its parent process. */
320 /* "Trace me, Dr. Memory!" */
321 call_ptrace (0, 0, (PTRACE_ARG3_TYPE
) 0, 0);
324 /* Stub function which causes the GDB that runs it, to start ptrace-ing
325 the child process. */
330 push_target (&child_ops
);
332 /* On some targets, there must be some explicit synchronization
333 between the parent and child processes after the debugger
334 forks, and before the child execs the debuggee program. This
335 call basically gives permission for the child to exec.
338 target_acknowledge_created_inferior (pid
);
340 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
341 * and will be 1 or 2 depending on whether we're starting
342 * without or with a shell.
344 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
346 /* On some targets, there must be some explicit actions taken after
347 the inferior has been started up.
349 target_post_startup_inferior (pid_to_ptid (pid
));
352 /* Start an inferior Unix child process and sets inferior_ptid to its pid.
353 EXEC_FILE is the file to run.
354 ALLARGS is a string containing the arguments to the program.
355 ENV is the environment vector to pass. Errors reported with error(). */
358 child_create_inferior (char *exec_file
, char *allargs
, char **env
)
361 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, pre_fork_inferior
, NULL
);
363 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, NULL
, NULL
);
365 /* We are at the first instruction we care about. */
366 /* Pedal to the metal... */
367 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_0
, 0);
370 #if !defined(CHILD_POST_STARTUP_INFERIOR)
372 child_post_startup_inferior (ptid_t ptid
)
374 /* This version of Unix doesn't require a meaningful "post startup inferior"
375 operation by a debugger.
380 #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
382 child_acknowledge_created_inferior (int pid
)
384 /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
385 operation by a debugger.
391 #if !defined(CHILD_INSERT_FORK_CATCHPOINT)
393 child_insert_fork_catchpoint (int pid
)
395 /* This version of Unix doesn't support notification of fork events. */
400 #if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
402 child_remove_fork_catchpoint (int pid
)
404 /* This version of Unix doesn't support notification of fork events. */
409 #if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
411 child_insert_vfork_catchpoint (int pid
)
413 /* This version of Unix doesn't support notification of vfork events. */
418 #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
420 child_remove_vfork_catchpoint (int pid
)
422 /* This version of Unix doesn't support notification of vfork events. */
427 #if !defined(CHILD_FOLLOW_FORK)
429 child_follow_fork (int follow_child
)
431 /* This version of Unix doesn't support following fork or vfork events. */
436 #if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
438 child_insert_exec_catchpoint (int pid
)
440 /* This version of Unix doesn't support notification of exec events. */
445 #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
447 child_remove_exec_catchpoint (int pid
)
449 /* This version of Unix doesn't support notification of exec events. */
454 #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
456 child_reported_exec_events_per_exec_call (void)
458 /* This version of Unix doesn't support notification of exec events.
464 #if !defined(CHILD_HAS_EXITED)
466 child_has_exited (int pid
, int wait_status
, int *exit_status
)
468 if (WIFEXITED (wait_status
))
470 *exit_status
= WEXITSTATUS (wait_status
);
474 if (WIFSIGNALED (wait_status
))
476 *exit_status
= 0; /* ?? Don't know what else to say here. */
480 /* ?? Do we really need to consult the event state, too? Assume the
481 wait_state alone suffices.
489 child_mourn_inferior (void)
491 unpush_target (&child_ops
);
492 generic_mourn_inferior ();
498 /* This variable is controlled by modules that sit atop inftarg that may layer
499 their own process structure atop that provided here. hpux-thread.c does
500 this because of the Hpux user-mode level thread model. */
502 return !child_suppress_run
;
505 /* Send a SIGINT to the process group. This acts just like the user typed a
506 ^C on the controlling terminal.
508 XXX - This may not be correct for all systems. Some may want to use
509 killpg() instead of kill (-pgrp). */
514 extern pid_t inferior_process_group
;
516 kill (-inferior_process_group
, SIGINT
);
519 #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
520 struct symtab_and_line
*
521 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
523 return (struct symtab_and_line
*) NULL
;
527 #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
528 struct exception_event_record
*
529 child_get_current_exception_event (void)
531 return (struct exception_event_record
*) NULL
;
536 #if !defined(CHILD_PID_TO_EXEC_FILE)
538 child_pid_to_exec_file (int pid
)
540 /* This version of Unix doesn't support translation of a process ID
541 to the filename of the executable file.
548 child_core_file_to_sym_file (char *core
)
550 /* The target stratum for a running executable need not support
557 #if !defined(CHILD_PID_TO_STR)
559 child_pid_to_str (ptid_t ptid
)
561 return normal_pid_to_str (ptid
);
566 init_child_ops (void)
568 child_ops
.to_shortname
= "child";
569 child_ops
.to_longname
= "Unix child process";
570 child_ops
.to_doc
= "Unix child process (started by the \"run\" command).";
571 child_ops
.to_open
= child_open
;
572 child_ops
.to_attach
= child_attach
;
573 child_ops
.to_post_attach
= child_post_attach
;
574 child_ops
.to_detach
= child_detach
;
575 child_ops
.to_resume
= child_resume
;
576 child_ops
.to_wait
= child_wait
;
577 child_ops
.to_post_wait
= child_post_wait
;
578 child_ops
.to_fetch_registers
= fetch_inferior_registers
;
579 child_ops
.to_store_registers
= store_inferior_registers
;
580 child_ops
.to_prepare_to_store
= child_prepare_to_store
;
581 child_ops
.to_xfer_memory
= child_xfer_memory
;
582 child_ops
.to_files_info
= child_files_info
;
583 child_ops
.to_insert_breakpoint
= memory_insert_breakpoint
;
584 child_ops
.to_remove_breakpoint
= memory_remove_breakpoint
;
585 child_ops
.to_terminal_init
= terminal_init_inferior
;
586 child_ops
.to_terminal_inferior
= terminal_inferior
;
587 child_ops
.to_terminal_ours_for_output
= terminal_ours_for_output
;
588 child_ops
.to_terminal_save_ours
= terminal_save_ours
;
589 child_ops
.to_terminal_ours
= terminal_ours
;
590 child_ops
.to_terminal_info
= child_terminal_info
;
591 child_ops
.to_kill
= kill_inferior
;
592 child_ops
.to_create_inferior
= child_create_inferior
;
593 child_ops
.to_post_startup_inferior
= child_post_startup_inferior
;
594 child_ops
.to_acknowledge_created_inferior
= child_acknowledge_created_inferior
;
595 child_ops
.to_insert_fork_catchpoint
= child_insert_fork_catchpoint
;
596 child_ops
.to_remove_fork_catchpoint
= child_remove_fork_catchpoint
;
597 child_ops
.to_insert_vfork_catchpoint
= child_insert_vfork_catchpoint
;
598 child_ops
.to_remove_vfork_catchpoint
= child_remove_vfork_catchpoint
;
599 child_ops
.to_follow_fork
= child_follow_fork
;
600 child_ops
.to_insert_exec_catchpoint
= child_insert_exec_catchpoint
;
601 child_ops
.to_remove_exec_catchpoint
= child_remove_exec_catchpoint
;
602 child_ops
.to_reported_exec_events_per_exec_call
= child_reported_exec_events_per_exec_call
;
603 child_ops
.to_has_exited
= child_has_exited
;
604 child_ops
.to_mourn_inferior
= child_mourn_inferior
;
605 child_ops
.to_can_run
= child_can_run
;
606 child_ops
.to_thread_alive
= child_thread_alive
;
607 child_ops
.to_pid_to_str
= child_pid_to_str
;
608 child_ops
.to_stop
= child_stop
;
609 child_ops
.to_enable_exception_callback
= child_enable_exception_callback
;
610 child_ops
.to_get_current_exception_event
= child_get_current_exception_event
;
611 child_ops
.to_pid_to_exec_file
= child_pid_to_exec_file
;
612 child_ops
.to_stratum
= process_stratum
;
613 child_ops
.to_has_all_memory
= 1;
614 child_ops
.to_has_memory
= 1;
615 child_ops
.to_has_stack
= 1;
616 child_ops
.to_has_registers
= 1;
617 child_ops
.to_has_execution
= 1;
618 child_ops
.to_magic
= OPS_MAGIC
;
621 /* Take over the 'find_mapped_memory' vector from inftarg.c. */
623 inftarg_set_find_memory_regions (int (*func
) (int (*) (CORE_ADDR
,
629 child_ops
.to_find_memory_regions
= func
;
632 /* Take over the 'make_corefile_notes' vector from inftarg.c. */
634 inftarg_set_make_corefile_notes (char * (*func
) (bfd
*, int *))
636 child_ops
.to_make_corefile_notes
= func
;
640 _initialize_inftarg (void)
642 #ifdef HAVE_OPTIONAL_PROC_FS
646 /* If we have an optional /proc filesystem (e.g. under OSF/1),
647 don't add ptrace support if we can access the running GDB via /proc. */
648 #ifndef PROC_NAME_FMT
649 #define PROC_NAME_FMT "/proc/%05d"
651 sprintf (procname
, PROC_NAME_FMT
, getpid ());
652 if ((fd
= open (procname
, O_RDONLY
)) >= 0)
660 add_target (&child_ops
);