1 /* Target-vector operations for controlling Unix child processes, for GDB.
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
4 2000, 2002, 2003, 2004, 2005 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., 51 Franklin Street, Fifth Floor,
25 Boston, MA 02110-1301, 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 static void child_open (char *, int);
58 static void child_files_info (struct target_ops
*);
60 static void child_detach (char *, int);
62 static void child_attach (char *, int);
64 #if !defined(CHILD_POST_ATTACH)
65 extern void child_post_attach (int);
68 static void ptrace_me (void);
70 static void ptrace_him (int);
72 static void child_create_inferior (char *, char *, char **, int);
74 static void child_mourn_inferior (void);
76 static int child_can_run (void);
78 static void child_stop (void);
80 #ifndef CHILD_THREAD_ALIVE
81 int child_thread_alive (ptid_t
);
84 static void init_child_ops (void);
86 extern char **environ
;
88 int child_suppress_run
= 0; /* Non-zero if inftarg should pretend not to
89 be a runnable target. Used by targets
90 that can sit atop inftarg, such as HPUX
95 /* Wait for child to do something. Return pid of child, or -1 in case
96 of error; store status through argument pointer OURSTATUS. */
99 child_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
103 char *execd_pathname
= NULL
;
106 enum target_waitkind kind
;
111 set_sigint_trap (); /* Causes SIGINT to be passed on to the
115 pid
= wait (&status
);
121 clear_sigint_trap ();
125 if (save_errno
== EINTR
)
128 fprintf_unfiltered (gdb_stderr
, "Child process unexpectedly missing: %s.\n",
129 safe_strerror (save_errno
));
131 /* Claim it exited with unknown signal. */
132 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
133 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
134 return pid_to_ptid (-1);
139 if (target_has_exited (pid
, status
, &exit_status
))
141 /* ??rehrauer: For now, ignore this. */
145 if (!target_thread_alive (pid_to_ptid (pid
)))
147 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
148 return pid_to_ptid (pid
);
150 } while (pid
!= PIDGET (inferior_ptid
)); /* Some other child died or stopped */
152 store_waitstatus (ourstatus
, status
);
153 return pid_to_ptid (pid
);
155 #endif /* CHILD_WAIT */
157 #ifndef CHILD_THREAD_ALIVE
159 /* Check to see if the given thread is alive.
161 FIXME: Is kill() ever the right way to do this? I doubt it, but
162 for now we're going to try and be compatable with the old thread
165 child_thread_alive (ptid_t ptid
)
167 pid_t pid
= PIDGET (ptid
);
169 return (kill (pid
, 0) != -1);
174 /* Attach to process PID, then initialize for debugging it. */
177 child_attach (char *args
, int from_tty
)
184 error_no_arg (_("process-id to attach"));
187 pid
= strtol (args
, &dummy
, 0);
188 /* Some targets don't set errno on errors, grrr! */
189 if ((pid
== 0) && (args
== dummy
))
190 error (_("Illegal process-id: %s."), args
);
192 if (pid
== getpid ()) /* Trying to masturbate? */
193 error (_("I refuse to debug myself!"));
197 exec_file
= (char *) get_exec_file (0);
200 printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file
,
201 target_pid_to_str (pid_to_ptid (pid
)));
203 printf_unfiltered (_("Attaching to %s\n"),
204 target_pid_to_str (pid_to_ptid (pid
)));
206 gdb_flush (gdb_stdout
);
211 inferior_ptid
= pid_to_ptid (pid
);
212 push_target (&deprecated_child_ops
);
214 /* Do this first, before anything has had a chance to query the
215 inferior's symbol table or similar. */
216 observer_notify_inferior_created (¤t_target
, from_tty
);
219 #if !defined(CHILD_POST_ATTACH)
221 child_post_attach (int pid
)
223 /* This version of Unix doesn't require a meaningful "post attach"
224 operation by a debugger. */
228 /* Take a program previously attached to and detaches it.
229 The program resumes execution and will no longer stop
230 on signals, etc. We'd better not have left any breakpoints
231 in the program or it'll die when it hits one. For this
232 to work, it may be necessary for the process to have been
233 previously attached. It *might* work if the program was
234 started via the normal ptrace (PTRACE_TRACEME). */
237 child_detach (char *args
, int from_tty
)
240 int pid
= PIDGET (inferior_ptid
);
244 char *exec_file
= get_exec_file (0);
247 printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file
,
248 target_pid_to_str (pid_to_ptid (pid
)));
249 gdb_flush (gdb_stdout
);
252 siggnal
= atoi (args
);
256 inferior_ptid
= null_ptid
;
257 unpush_target (&deprecated_child_ops
);
260 /* Get ready to modify the registers array. On machines which store
261 individual registers, this doesn't need to do anything. On machines
262 which store all the registers in one fell swoop, this makes sure
263 that registers contains all the registers from the program being
267 child_prepare_to_store (void)
269 #ifdef CHILD_PREPARE_TO_STORE
270 CHILD_PREPARE_TO_STORE ();
274 /* Print status information about what we're accessing. */
277 child_files_info (struct target_ops
*ignore
)
279 printf_unfiltered (_("\tUsing the running image of %s %s.\n"),
280 attach_flag
? "attached" : "child", target_pid_to_str (inferior_ptid
));
284 child_open (char *arg
, int from_tty
)
286 error (_("Use the \"run\" command to start a Unix child process."));
289 /* Stub function which causes the inferior that runs it, to be ptrace-able
290 by its parent process. */
295 /* "Trace me, Dr. Memory!" */
296 call_ptrace (0, 0, (PTRACE_TYPE_ARG3
) 0, 0);
299 /* Stub function which causes the GDB that runs it, to start ptrace-ing
300 the child process. */
305 push_target (&deprecated_child_ops
);
307 /* On some targets, there must be some explicit synchronization
308 between the parent and child processes after the debugger
309 forks, and before the child execs the debuggee program. This
310 call basically gives permission for the child to exec.
313 target_acknowledge_created_inferior (pid
);
315 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
316 * and will be 1 or 2 depending on whether we're starting
317 * without or with a shell.
319 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
321 /* On some targets, there must be some explicit actions taken after
322 the inferior has been started up.
324 target_post_startup_inferior (pid_to_ptid (pid
));
327 /* Start an inferior Unix child process and sets inferior_ptid to its pid.
328 EXEC_FILE is the file to run.
329 ALLARGS is a string containing the arguments to the program.
330 ENV is the environment vector to pass. Errors reported with error(). */
333 child_create_inferior (char *exec_file
, char *allargs
, char **env
,
336 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, NULL
, NULL
);
338 /* We are at the first instruction we care about. */
339 observer_notify_inferior_created (¤t_target
, from_tty
);
340 /* Pedal to the metal... */
341 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_0
, 0);
344 #if !defined(CHILD_POST_STARTUP_INFERIOR)
346 child_post_startup_inferior (ptid_t ptid
)
348 /* This version of Unix doesn't require a meaningful "post startup inferior"
349 operation by a debugger.
354 #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
356 child_acknowledge_created_inferior (int pid
)
358 /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
359 operation by a debugger.
365 #if !defined(CHILD_INSERT_FORK_CATCHPOINT)
367 child_insert_fork_catchpoint (int pid
)
369 /* This version of Unix doesn't support notification of fork
374 #if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
376 child_remove_fork_catchpoint (int pid
)
378 /* This version of Unix doesn't support notification of fork events. */
383 #if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
385 child_insert_vfork_catchpoint (int pid
)
387 /* This version of Unix doesn't support notification of vfork
392 #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
394 child_remove_vfork_catchpoint (int pid
)
396 /* This version of Unix doesn't support notification of vfork events. */
401 #if !defined(CHILD_FOLLOW_FORK)
403 child_follow_fork (struct target_ops
*ops
, int follow_child
)
405 /* This version of Unix doesn't support following fork or vfork events. */
410 #if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
412 child_insert_exec_catchpoint (int pid
)
414 /* This version of Unix doesn't support notification of exec
419 #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
421 child_remove_exec_catchpoint (int pid
)
423 /* This version of Unix doesn't support notification of exec events. */
428 #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
430 child_reported_exec_events_per_exec_call (void)
432 /* This version of Unix doesn't support notification of exec events.
438 #if !defined(CHILD_HAS_EXITED)
440 child_has_exited (int pid
, int wait_status
, int *exit_status
)
442 if (WIFEXITED (wait_status
))
444 *exit_status
= WEXITSTATUS (wait_status
);
448 if (WIFSIGNALED (wait_status
))
450 *exit_status
= 0; /* ?? Don't know what else to say here. */
454 /* ?? Do we really need to consult the event state, too? Assume the
455 wait_state alone suffices.
463 child_mourn_inferior (void)
465 unpush_target (&deprecated_child_ops
);
466 generic_mourn_inferior ();
472 /* This variable is controlled by modules that sit atop inftarg that may layer
473 their own process structure atop that provided here. hpux-thread.c does
474 this because of the Hpux user-mode level thread model. */
476 return !child_suppress_run
;
479 /* Send a SIGINT to the process group. This acts just like the user typed a
480 ^C on the controlling terminal.
482 XXX - This may not be correct for all systems. Some may want to use
483 killpg() instead of kill (-pgrp). */
488 kill (-inferior_process_group
, SIGINT
);
491 #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
492 struct symtab_and_line
*
493 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
495 return (struct symtab_and_line
*) NULL
;
499 #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
500 struct exception_event_record
*
501 child_get_current_exception_event (void)
503 return (struct exception_event_record
*) NULL
;
508 #if !defined(CHILD_PID_TO_EXEC_FILE)
510 child_pid_to_exec_file (int pid
)
512 /* This version of Unix doesn't support translation of a process ID
513 to the filename of the executable file.
520 child_core_file_to_sym_file (char *core
)
522 /* The target stratum for a running executable need not support
528 /* Perform a partial transfer to/from the specified object. For
529 memory transfers, fall back to the old memory xfer functions. */
532 child_xfer_partial (struct target_ops
*ops
, enum target_object object
,
533 const char *annex
, gdb_byte
*readbuf
,
534 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
538 case TARGET_OBJECT_MEMORY
:
540 return child_xfer_memory (offset
, readbuf
, len
, 0/*write*/,
543 return child_xfer_memory (offset
, (void *) writebuf
, len
, 1/*write*/,
547 case TARGET_OBJECT_UNWIND_TABLE
:
548 #ifndef NATIVE_XFER_UNWIND_TABLE
549 #define NATIVE_XFER_UNWIND_TABLE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
551 return NATIVE_XFER_UNWIND_TABLE (ops
, object
, annex
, readbuf
, writebuf
,
554 case TARGET_OBJECT_AUXV
:
555 #ifndef NATIVE_XFER_AUXV
556 #define NATIVE_XFER_AUXV(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
558 return NATIVE_XFER_AUXV (ops
, object
, annex
, readbuf
, writebuf
,
566 #if !defined(CHILD_PID_TO_STR)
568 child_pid_to_str (ptid_t ptid
)
570 return normal_pid_to_str (ptid
);
575 init_child_ops (void)
577 deprecated_child_ops
.to_shortname
= "child";
578 deprecated_child_ops
.to_longname
= "Unix child process";
579 deprecated_child_ops
.to_doc
= "Unix child process (started by the \"run\" command).";
580 deprecated_child_ops
.to_open
= child_open
;
581 deprecated_child_ops
.to_attach
= child_attach
;
582 deprecated_child_ops
.to_post_attach
= child_post_attach
;
583 deprecated_child_ops
.to_detach
= child_detach
;
584 deprecated_child_ops
.to_resume
= child_resume
;
585 deprecated_child_ops
.to_wait
= child_wait
;
586 deprecated_child_ops
.to_fetch_registers
= fetch_inferior_registers
;
587 deprecated_child_ops
.to_store_registers
= store_inferior_registers
;
588 deprecated_child_ops
.to_prepare_to_store
= child_prepare_to_store
;
589 deprecated_child_ops
.deprecated_xfer_memory
= child_xfer_memory
;
590 deprecated_child_ops
.to_xfer_partial
= child_xfer_partial
;
591 deprecated_child_ops
.to_files_info
= child_files_info
;
592 deprecated_child_ops
.to_insert_breakpoint
= memory_insert_breakpoint
;
593 deprecated_child_ops
.to_remove_breakpoint
= memory_remove_breakpoint
;
594 deprecated_child_ops
.to_terminal_init
= terminal_init_inferior
;
595 deprecated_child_ops
.to_terminal_inferior
= terminal_inferior
;
596 deprecated_child_ops
.to_terminal_ours_for_output
= terminal_ours_for_output
;
597 deprecated_child_ops
.to_terminal_save_ours
= terminal_save_ours
;
598 deprecated_child_ops
.to_terminal_ours
= terminal_ours
;
599 deprecated_child_ops
.to_terminal_info
= child_terminal_info
;
600 deprecated_child_ops
.to_kill
= kill_inferior
;
601 deprecated_child_ops
.to_create_inferior
= child_create_inferior
;
602 deprecated_child_ops
.to_post_startup_inferior
= child_post_startup_inferior
;
603 deprecated_child_ops
.to_acknowledge_created_inferior
= child_acknowledge_created_inferior
;
604 deprecated_child_ops
.to_insert_fork_catchpoint
= child_insert_fork_catchpoint
;
605 deprecated_child_ops
.to_remove_fork_catchpoint
= child_remove_fork_catchpoint
;
606 deprecated_child_ops
.to_insert_vfork_catchpoint
= child_insert_vfork_catchpoint
;
607 deprecated_child_ops
.to_remove_vfork_catchpoint
= child_remove_vfork_catchpoint
;
608 deprecated_child_ops
.to_follow_fork
= child_follow_fork
;
609 deprecated_child_ops
.to_insert_exec_catchpoint
= child_insert_exec_catchpoint
;
610 deprecated_child_ops
.to_remove_exec_catchpoint
= child_remove_exec_catchpoint
;
611 deprecated_child_ops
.to_reported_exec_events_per_exec_call
= child_reported_exec_events_per_exec_call
;
612 deprecated_child_ops
.to_has_exited
= child_has_exited
;
613 deprecated_child_ops
.to_mourn_inferior
= child_mourn_inferior
;
614 deprecated_child_ops
.to_can_run
= child_can_run
;
615 deprecated_child_ops
.to_thread_alive
= child_thread_alive
;
616 deprecated_child_ops
.to_pid_to_str
= child_pid_to_str
;
617 deprecated_child_ops
.to_stop
= child_stop
;
618 deprecated_child_ops
.to_enable_exception_callback
= child_enable_exception_callback
;
619 deprecated_child_ops
.to_get_current_exception_event
= child_get_current_exception_event
;
620 deprecated_child_ops
.to_pid_to_exec_file
= child_pid_to_exec_file
;
621 deprecated_child_ops
.to_stratum
= process_stratum
;
622 deprecated_child_ops
.to_has_all_memory
= 1;
623 deprecated_child_ops
.to_has_memory
= 1;
624 deprecated_child_ops
.to_has_stack
= 1;
625 deprecated_child_ops
.to_has_registers
= 1;
626 deprecated_child_ops
.to_has_execution
= 1;
627 deprecated_child_ops
.to_magic
= OPS_MAGIC
;
631 _initialize_inftarg (void)
633 #ifdef HAVE_OPTIONAL_PROC_FS
637 /* If we have an optional /proc filesystem (e.g. under OSF/1),
638 don't add ptrace support if we can access the running GDB via /proc. */
639 #ifndef PROC_NAME_FMT
640 #define PROC_NAME_FMT "/proc/%05d"
642 sprintf (procname
, PROC_NAME_FMT
, getpid ());
643 fd
= open (procname
, O_RDONLY
);
652 add_target (&deprecated_child_ops
);