1 /* Target-vector operations for controlling Unix child processes, for GDB.
3 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
4 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
6 Contributed by Cygnus Support.
8 ## Contains temporary hacks..
10 This file is part of GDB.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place - Suite 330,
25 Boston, MA 02111-1307, USA. */
28 #include "frame.h" /* required by inferior.h */
35 #include <sys/types.h>
41 extern struct symtab_and_line
*child_enable_exception_callback (enum
45 extern struct exception_event_record
46 *child_get_current_exception_event (void);
48 extern void _initialize_inftarg (void);
50 static void child_prepare_to_store (void);
53 static ptid_t
child_wait (ptid_t
, struct target_waitstatus
*);
54 #endif /* CHILD_WAIT */
56 #if !defined(CHILD_POST_WAIT)
57 void child_post_wait (ptid_t
, int);
60 static void child_open (char *, int);
62 static void child_files_info (struct target_ops
*);
64 static void child_detach (char *, int);
66 static void child_attach (char *, int);
68 #if !defined(CHILD_POST_ATTACH)
69 extern void child_post_attach (int);
72 static void ptrace_me (void);
74 static void ptrace_him (int);
76 static void child_create_inferior (char *, char *, char **, int);
78 static void child_mourn_inferior (void);
80 static int child_can_run (void);
82 static void child_stop (void);
84 #ifndef CHILD_THREAD_ALIVE
85 int child_thread_alive (ptid_t
);
88 static void init_child_ops (void);
90 extern char **environ
;
92 struct target_ops child_ops
;
94 int child_suppress_run
= 0; /* Non-zero if inftarg should pretend not to
95 be a runnable target. Used by targets
96 that can sit atop inftarg, such as HPUX
101 /* Wait for child to do something. Return pid of child, or -1 in case
102 of error; store status through argument pointer OURSTATUS. */
105 child_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
109 char *execd_pathname
= NULL
;
113 enum target_waitkind kind
;
118 set_sigint_trap (); /* Causes SIGINT to be passed on to the
122 pid
= ptrace_wait (inferior_ptid
, &status
);
128 clear_sigint_trap ();
132 if (save_errno
== EINTR
)
135 fprintf_unfiltered (gdb_stderr
, "Child process unexpectedly missing: %s.\n",
136 safe_strerror (save_errno
));
138 /* Claim it exited with unknown signal. */
139 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
140 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
141 return pid_to_ptid (-1);
146 if (target_has_exited (pid
, status
, &exit_status
))
148 /* ??rehrauer: For now, ignore this. */
152 if (!target_thread_alive (pid_to_ptid (pid
)))
154 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
155 return pid_to_ptid (pid
);
157 } while (pid
!= PIDGET (inferior_ptid
)); /* Some other child died or stopped */
159 store_waitstatus (ourstatus
, status
);
160 return pid_to_ptid (pid
);
162 #endif /* CHILD_WAIT */
164 #if !defined(CHILD_POST_WAIT)
166 child_post_wait (ptid_t ptid
, int wait_status
)
168 /* This version of Unix doesn't require a meaningful "post wait"
175 #ifndef CHILD_THREAD_ALIVE
177 /* Check to see if the given thread is alive.
179 FIXME: Is kill() ever the right way to do this? I doubt it, but
180 for now we're going to try and be compatable with the old thread
183 child_thread_alive (ptid_t ptid
)
185 pid_t pid
= PIDGET (ptid
);
187 return (kill (pid
, 0) != -1);
192 /* Attach to process PID, then initialize for debugging it. */
195 child_attach (char *args
, int from_tty
)
202 error_no_arg ("process-id to attach");
205 pid
= strtol (args
, &dummy
, 0);
206 /* Some targets don't set errno on errors, grrr! */
207 if ((pid
== 0) && (args
== dummy
))
208 error ("Illegal process-id: %s\n", args
);
210 if (pid
== getpid ()) /* Trying to masturbate? */
211 error ("I refuse to debug myself!");
215 exec_file
= (char *) get_exec_file (0);
218 printf_unfiltered ("Attaching to program: %s, %s\n", exec_file
,
219 target_pid_to_str (pid_to_ptid (pid
)));
221 printf_unfiltered ("Attaching to %s\n",
222 target_pid_to_str (pid_to_ptid (pid
)));
224 gdb_flush (gdb_stdout
);
229 inferior_ptid
= pid_to_ptid (pid
);
230 push_target (&child_ops
);
233 #if !defined(CHILD_POST_ATTACH)
235 child_post_attach (int pid
)
237 /* This version of Unix doesn't require a meaningful "post attach"
238 operation by a debugger. */
242 /* Take a program previously attached to and detaches it.
243 The program resumes execution and will no longer stop
244 on signals, etc. We'd better not have left any breakpoints
245 in the program or it'll die when it hits one. For this
246 to work, it may be necessary for the process to have been
247 previously attached. It *might* work if the program was
248 started via the normal ptrace (PTRACE_TRACEME). */
251 child_detach (char *args
, int from_tty
)
254 int pid
= PIDGET (inferior_ptid
);
258 char *exec_file
= get_exec_file (0);
261 printf_unfiltered ("Detaching from program: %s, %s\n", exec_file
,
262 target_pid_to_str (pid_to_ptid (pid
)));
263 gdb_flush (gdb_stdout
);
266 siggnal
= atoi (args
);
270 inferior_ptid
= null_ptid
;
271 unpush_target (&child_ops
);
274 /* Get ready to modify the registers array. On machines which store
275 individual registers, this doesn't need to do anything. On machines
276 which store all the registers in one fell swoop, this makes sure
277 that registers contains all the registers from the program being
281 child_prepare_to_store (void)
283 #ifdef CHILD_PREPARE_TO_STORE
284 CHILD_PREPARE_TO_STORE ();
288 /* Print status information about what we're accessing. */
291 child_files_info (struct target_ops
*ignore
)
293 printf_unfiltered ("\tUsing the running image of %s %s.\n",
294 attach_flag
? "attached" : "child", target_pid_to_str (inferior_ptid
));
298 child_open (char *arg
, int from_tty
)
300 error ("Use the \"run\" command to start a Unix child process.");
303 /* Stub function which causes the inferior that runs it, to be ptrace-able
304 by its parent process. */
309 /* "Trace me, Dr. Memory!" */
310 call_ptrace (0, 0, (PTRACE_ARG3_TYPE
) 0, 0);
313 /* Stub function which causes the GDB that runs it, to start ptrace-ing
314 the child process. */
319 push_target (&child_ops
);
321 /* On some targets, there must be some explicit synchronization
322 between the parent and child processes after the debugger
323 forks, and before the child execs the debuggee program. This
324 call basically gives permission for the child to exec.
327 target_acknowledge_created_inferior (pid
);
329 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
330 * and will be 1 or 2 depending on whether we're starting
331 * without or with a shell.
333 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
335 /* On some targets, there must be some explicit actions taken after
336 the inferior has been started up.
338 target_post_startup_inferior (pid_to_ptid (pid
));
341 /* Start an inferior Unix child process and sets inferior_ptid to its pid.
342 EXEC_FILE is the file to run.
343 ALLARGS is a string containing the arguments to the program.
344 ENV is the environment vector to pass. Errors reported with error(). */
347 child_create_inferior (char *exec_file
, char *allargs
, char **env
,
351 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, pre_fork_inferior
, NULL
);
353 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, NULL
, NULL
);
355 /* We are at the first instruction we care about. */
356 observer_notify_inferior_created (¤t_target
, from_tty
);
357 /* Pedal to the metal... */
358 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_0
, 0);
361 #if !defined(CHILD_POST_STARTUP_INFERIOR)
363 child_post_startup_inferior (ptid_t ptid
)
365 /* This version of Unix doesn't require a meaningful "post startup inferior"
366 operation by a debugger.
371 #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
373 child_acknowledge_created_inferior (int pid
)
375 /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
376 operation by a debugger.
382 #if !defined(CHILD_INSERT_FORK_CATCHPOINT)
384 child_insert_fork_catchpoint (int pid
)
386 /* This version of Unix doesn't support notification of fork events. */
391 #if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
393 child_remove_fork_catchpoint (int pid
)
395 /* This version of Unix doesn't support notification of fork events. */
400 #if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
402 child_insert_vfork_catchpoint (int pid
)
404 /* This version of Unix doesn't support notification of vfork events. */
409 #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
411 child_remove_vfork_catchpoint (int pid
)
413 /* This version of Unix doesn't support notification of vfork events. */
418 #if !defined(CHILD_FOLLOW_FORK)
420 child_follow_fork (int follow_child
)
422 /* This version of Unix doesn't support following fork or vfork events. */
427 #if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
429 child_insert_exec_catchpoint (int pid
)
431 /* This version of Unix doesn't support notification of exec events. */
436 #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
438 child_remove_exec_catchpoint (int pid
)
440 /* This version of Unix doesn't support notification of exec events. */
445 #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
447 child_reported_exec_events_per_exec_call (void)
449 /* This version of Unix doesn't support notification of exec events.
455 #if !defined(CHILD_HAS_EXITED)
457 child_has_exited (int pid
, int wait_status
, int *exit_status
)
459 if (WIFEXITED (wait_status
))
461 *exit_status
= WEXITSTATUS (wait_status
);
465 if (WIFSIGNALED (wait_status
))
467 *exit_status
= 0; /* ?? Don't know what else to say here. */
471 /* ?? Do we really need to consult the event state, too? Assume the
472 wait_state alone suffices.
480 child_mourn_inferior (void)
482 unpush_target (&child_ops
);
483 generic_mourn_inferior ();
489 /* This variable is controlled by modules that sit atop inftarg that may layer
490 their own process structure atop that provided here. hpux-thread.c does
491 this because of the Hpux user-mode level thread model. */
493 return !child_suppress_run
;
496 /* Send a SIGINT to the process group. This acts just like the user typed a
497 ^C on the controlling terminal.
499 XXX - This may not be correct for all systems. Some may want to use
500 killpg() instead of kill (-pgrp). */
505 kill (-inferior_process_group
, SIGINT
);
508 #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
509 struct symtab_and_line
*
510 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
512 return (struct symtab_and_line
*) NULL
;
516 #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
517 struct exception_event_record
*
518 child_get_current_exception_event (void)
520 return (struct exception_event_record
*) NULL
;
525 #if !defined(CHILD_PID_TO_EXEC_FILE)
527 child_pid_to_exec_file (int pid
)
529 /* This version of Unix doesn't support translation of a process ID
530 to the filename of the executable file.
537 child_core_file_to_sym_file (char *core
)
539 /* The target stratum for a running executable need not support
545 /* Perform a partial transfer to/from the specified object. For
546 memory transfers, fall back to the old memory xfer functions. */
549 child_xfer_partial (struct target_ops
*ops
, enum target_object object
,
550 const char *annex
, void *readbuf
,
551 const void *writebuf
, ULONGEST offset
, LONGEST len
)
555 case TARGET_OBJECT_MEMORY
:
557 return child_xfer_memory (offset
, readbuf
, len
, 0/*write*/,
560 return child_xfer_memory (offset
, readbuf
, len
, 1/*write*/,
564 case TARGET_OBJECT_UNWIND_TABLE
:
565 #ifndef NATIVE_XFER_UNWIND_TABLE
566 #define NATIVE_XFER_UNWIND_TABLE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
568 return NATIVE_XFER_UNWIND_TABLE (ops
, object
, annex
, readbuf
, writebuf
,
571 case TARGET_OBJECT_AUXV
:
572 #ifndef NATIVE_XFER_AUXV
573 #define NATIVE_XFER_AUXV(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
575 return NATIVE_XFER_AUXV (ops
, object
, annex
, readbuf
, writebuf
,
578 case TARGET_OBJECT_WCOOKIE
:
579 #ifndef NATIVE_XFER_WCOOKIE
580 #define NATIVE_XFER_WCOOKIE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
582 return NATIVE_XFER_WCOOKIE (ops
, object
, annex
, readbuf
, writebuf
,
590 #if !defined(CHILD_PID_TO_STR)
592 child_pid_to_str (ptid_t ptid
)
594 return normal_pid_to_str (ptid
);
599 init_child_ops (void)
601 child_ops
.to_shortname
= "child";
602 child_ops
.to_longname
= "Unix child process";
603 child_ops
.to_doc
= "Unix child process (started by the \"run\" command).";
604 child_ops
.to_open
= child_open
;
605 child_ops
.to_attach
= child_attach
;
606 child_ops
.to_post_attach
= child_post_attach
;
607 child_ops
.to_detach
= child_detach
;
608 child_ops
.to_resume
= child_resume
;
609 child_ops
.to_wait
= child_wait
;
610 child_ops
.to_post_wait
= child_post_wait
;
611 child_ops
.to_fetch_registers
= fetch_inferior_registers
;
612 child_ops
.to_store_registers
= store_inferior_registers
;
613 child_ops
.to_prepare_to_store
= child_prepare_to_store
;
614 child_ops
.to_xfer_memory
= child_xfer_memory
;
615 child_ops
.to_xfer_partial
= child_xfer_partial
;
616 child_ops
.to_files_info
= child_files_info
;
617 child_ops
.to_insert_breakpoint
= memory_insert_breakpoint
;
618 child_ops
.to_remove_breakpoint
= memory_remove_breakpoint
;
619 child_ops
.to_terminal_init
= terminal_init_inferior
;
620 child_ops
.to_terminal_inferior
= terminal_inferior
;
621 child_ops
.to_terminal_ours_for_output
= terminal_ours_for_output
;
622 child_ops
.to_terminal_save_ours
= terminal_save_ours
;
623 child_ops
.to_terminal_ours
= terminal_ours
;
624 child_ops
.to_terminal_info
= child_terminal_info
;
625 child_ops
.to_kill
= kill_inferior
;
626 child_ops
.to_create_inferior
= child_create_inferior
;
627 child_ops
.to_post_startup_inferior
= child_post_startup_inferior
;
628 child_ops
.to_acknowledge_created_inferior
= child_acknowledge_created_inferior
;
629 child_ops
.to_insert_fork_catchpoint
= child_insert_fork_catchpoint
;
630 child_ops
.to_remove_fork_catchpoint
= child_remove_fork_catchpoint
;
631 child_ops
.to_insert_vfork_catchpoint
= child_insert_vfork_catchpoint
;
632 child_ops
.to_remove_vfork_catchpoint
= child_remove_vfork_catchpoint
;
633 child_ops
.to_follow_fork
= child_follow_fork
;
634 child_ops
.to_insert_exec_catchpoint
= child_insert_exec_catchpoint
;
635 child_ops
.to_remove_exec_catchpoint
= child_remove_exec_catchpoint
;
636 child_ops
.to_reported_exec_events_per_exec_call
= child_reported_exec_events_per_exec_call
;
637 child_ops
.to_has_exited
= child_has_exited
;
638 child_ops
.to_mourn_inferior
= child_mourn_inferior
;
639 child_ops
.to_can_run
= child_can_run
;
640 child_ops
.to_thread_alive
= child_thread_alive
;
641 child_ops
.to_pid_to_str
= child_pid_to_str
;
642 child_ops
.to_stop
= child_stop
;
643 child_ops
.to_enable_exception_callback
= child_enable_exception_callback
;
644 child_ops
.to_get_current_exception_event
= child_get_current_exception_event
;
645 child_ops
.to_pid_to_exec_file
= child_pid_to_exec_file
;
646 child_ops
.to_stratum
= process_stratum
;
647 child_ops
.to_has_all_memory
= 1;
648 child_ops
.to_has_memory
= 1;
649 child_ops
.to_has_stack
= 1;
650 child_ops
.to_has_registers
= 1;
651 child_ops
.to_has_execution
= 1;
652 child_ops
.to_magic
= OPS_MAGIC
;
655 /* Take over the 'find_mapped_memory' vector from inftarg.c. */
657 inftarg_set_find_memory_regions (int (*func
) (int (*) (CORE_ADDR
,
663 child_ops
.to_find_memory_regions
= func
;
666 /* Take over the 'make_corefile_notes' vector from inftarg.c. */
668 inftarg_set_make_corefile_notes (char * (*func
) (bfd
*, int *))
670 child_ops
.to_make_corefile_notes
= func
;
674 _initialize_inftarg (void)
676 #ifdef HAVE_OPTIONAL_PROC_FS
680 /* If we have an optional /proc filesystem (e.g. under OSF/1),
681 don't add ptrace support if we can access the running GDB via /proc. */
682 #ifndef PROC_NAME_FMT
683 #define PROC_NAME_FMT "/proc/%05d"
685 sprintf (procname
, PROC_NAME_FMT
, getpid ());
686 fd
= open (procname
, O_RDONLY
);
695 add_target (&child_ops
);