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 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
;
107 enum target_waitkind kind
;
112 set_sigint_trap (); /* Causes SIGINT to be passed on to the
116 pid
= wait (&status
);
122 clear_sigint_trap ();
126 if (save_errno
== EINTR
)
129 fprintf_unfiltered (gdb_stderr
, "Child process unexpectedly missing: %s.\n",
130 safe_strerror (save_errno
));
132 /* Claim it exited with unknown signal. */
133 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
134 ourstatus
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
135 return pid_to_ptid (-1);
140 if (target_has_exited (pid
, status
, &exit_status
))
142 /* ??rehrauer: For now, ignore this. */
146 if (!target_thread_alive (pid_to_ptid (pid
)))
148 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
149 return pid_to_ptid (pid
);
151 } while (pid
!= PIDGET (inferior_ptid
)); /* Some other child died or stopped */
153 store_waitstatus (ourstatus
, status
);
154 return pid_to_ptid (pid
);
156 #endif /* CHILD_WAIT */
158 #ifndef CHILD_THREAD_ALIVE
160 /* Check to see if the given thread is alive.
162 FIXME: Is kill() ever the right way to do this? I doubt it, but
163 for now we're going to try and be compatable with the old thread
166 child_thread_alive (ptid_t ptid
)
168 pid_t pid
= PIDGET (ptid
);
170 return (kill (pid
, 0) != -1);
175 /* Attach to process PID, then initialize for debugging it. */
178 child_attach (char *args
, int from_tty
)
185 error_no_arg ("process-id to attach");
188 pid
= strtol (args
, &dummy
, 0);
189 /* Some targets don't set errno on errors, grrr! */
190 if ((pid
== 0) && (args
== dummy
))
191 error ("Illegal process-id: %s\n", args
);
193 if (pid
== getpid ()) /* Trying to masturbate? */
194 error ("I refuse to debug myself!");
198 exec_file
= (char *) get_exec_file (0);
201 printf_unfiltered ("Attaching to program: %s, %s\n", exec_file
,
202 target_pid_to_str (pid_to_ptid (pid
)));
204 printf_unfiltered ("Attaching to %s\n",
205 target_pid_to_str (pid_to_ptid (pid
)));
207 gdb_flush (gdb_stdout
);
212 inferior_ptid
= pid_to_ptid (pid
);
213 push_target (&child_ops
);
216 #if !defined(CHILD_POST_ATTACH)
218 child_post_attach (int pid
)
220 /* This version of Unix doesn't require a meaningful "post attach"
221 operation by a debugger. */
225 /* Take a program previously attached to and detaches it.
226 The program resumes execution and will no longer stop
227 on signals, etc. We'd better not have left any breakpoints
228 in the program or it'll die when it hits one. For this
229 to work, it may be necessary for the process to have been
230 previously attached. It *might* work if the program was
231 started via the normal ptrace (PTRACE_TRACEME). */
234 child_detach (char *args
, int from_tty
)
237 int pid
= PIDGET (inferior_ptid
);
241 char *exec_file
= get_exec_file (0);
244 printf_unfiltered ("Detaching from program: %s, %s\n", exec_file
,
245 target_pid_to_str (pid_to_ptid (pid
)));
246 gdb_flush (gdb_stdout
);
249 siggnal
= atoi (args
);
253 inferior_ptid
= null_ptid
;
254 unpush_target (&child_ops
);
257 /* Get ready to modify the registers array. On machines which store
258 individual registers, this doesn't need to do anything. On machines
259 which store all the registers in one fell swoop, this makes sure
260 that registers contains all the registers from the program being
264 child_prepare_to_store (void)
266 #ifdef CHILD_PREPARE_TO_STORE
267 CHILD_PREPARE_TO_STORE ();
271 /* Print status information about what we're accessing. */
274 child_files_info (struct target_ops
*ignore
)
276 printf_unfiltered ("\tUsing the running image of %s %s.\n",
277 attach_flag
? "attached" : "child", target_pid_to_str (inferior_ptid
));
281 child_open (char *arg
, int from_tty
)
283 error ("Use the \"run\" command to start a Unix child process.");
286 /* Stub function which causes the inferior that runs it, to be ptrace-able
287 by its parent process. */
292 /* "Trace me, Dr. Memory!" */
293 call_ptrace (0, 0, (PTRACE_TYPE_ARG3
) 0, 0);
296 /* Stub function which causes the GDB that runs it, to start ptrace-ing
297 the child process. */
302 push_target (&child_ops
);
304 /* On some targets, there must be some explicit synchronization
305 between the parent and child processes after the debugger
306 forks, and before the child execs the debuggee program. This
307 call basically gives permission for the child to exec.
310 target_acknowledge_created_inferior (pid
);
312 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
313 * and will be 1 or 2 depending on whether we're starting
314 * without or with a shell.
316 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
318 /* On some targets, there must be some explicit actions taken after
319 the inferior has been started up.
321 target_post_startup_inferior (pid_to_ptid (pid
));
324 /* Start an inferior Unix child process and sets inferior_ptid to its pid.
325 EXEC_FILE is the file to run.
326 ALLARGS is a string containing the arguments to the program.
327 ENV is the environment vector to pass. Errors reported with error(). */
330 child_create_inferior (char *exec_file
, char *allargs
, char **env
,
334 fork_inferior (exec_file
, allargs
, env
, ptrace_me
, ptrace_him
, pre_fork_inferior
, NULL
);
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 events. */
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 events. */
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 (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 events. */
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 (&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
, void *readbuf
,
534 const void *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
, readbuf
, 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
,
561 case TARGET_OBJECT_WCOOKIE
:
562 #ifndef NATIVE_XFER_WCOOKIE
563 #define NATIVE_XFER_WCOOKIE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
565 return NATIVE_XFER_WCOOKIE (ops
, object
, annex
, readbuf
, writebuf
,
573 #if !defined(CHILD_PID_TO_STR)
575 child_pid_to_str (ptid_t ptid
)
577 return normal_pid_to_str (ptid
);
582 init_child_ops (void)
584 child_ops
.to_shortname
= "child";
585 child_ops
.to_longname
= "Unix child process";
586 child_ops
.to_doc
= "Unix child process (started by the \"run\" command).";
587 child_ops
.to_open
= child_open
;
588 child_ops
.to_attach
= child_attach
;
589 child_ops
.to_post_attach
= child_post_attach
;
590 child_ops
.to_detach
= child_detach
;
591 child_ops
.to_resume
= child_resume
;
592 child_ops
.to_wait
= child_wait
;
593 child_ops
.to_fetch_registers
= fetch_inferior_registers
;
594 child_ops
.to_store_registers
= store_inferior_registers
;
595 child_ops
.to_prepare_to_store
= child_prepare_to_store
;
596 child_ops
.to_xfer_memory
= child_xfer_memory
;
597 child_ops
.to_xfer_partial
= child_xfer_partial
;
598 child_ops
.to_files_info
= child_files_info
;
599 child_ops
.to_insert_breakpoint
= memory_insert_breakpoint
;
600 child_ops
.to_remove_breakpoint
= memory_remove_breakpoint
;
601 child_ops
.to_terminal_init
= terminal_init_inferior
;
602 child_ops
.to_terminal_inferior
= terminal_inferior
;
603 child_ops
.to_terminal_ours_for_output
= terminal_ours_for_output
;
604 child_ops
.to_terminal_save_ours
= terminal_save_ours
;
605 child_ops
.to_terminal_ours
= terminal_ours
;
606 child_ops
.to_terminal_info
= child_terminal_info
;
607 child_ops
.to_kill
= kill_inferior
;
608 child_ops
.to_create_inferior
= child_create_inferior
;
609 child_ops
.to_post_startup_inferior
= child_post_startup_inferior
;
610 child_ops
.to_acknowledge_created_inferior
= child_acknowledge_created_inferior
;
611 child_ops
.to_insert_fork_catchpoint
= child_insert_fork_catchpoint
;
612 child_ops
.to_remove_fork_catchpoint
= child_remove_fork_catchpoint
;
613 child_ops
.to_insert_vfork_catchpoint
= child_insert_vfork_catchpoint
;
614 child_ops
.to_remove_vfork_catchpoint
= child_remove_vfork_catchpoint
;
615 child_ops
.to_follow_fork
= child_follow_fork
;
616 child_ops
.to_insert_exec_catchpoint
= child_insert_exec_catchpoint
;
617 child_ops
.to_remove_exec_catchpoint
= child_remove_exec_catchpoint
;
618 child_ops
.to_reported_exec_events_per_exec_call
= child_reported_exec_events_per_exec_call
;
619 child_ops
.to_has_exited
= child_has_exited
;
620 child_ops
.to_mourn_inferior
= child_mourn_inferior
;
621 child_ops
.to_can_run
= child_can_run
;
622 child_ops
.to_thread_alive
= child_thread_alive
;
623 child_ops
.to_pid_to_str
= child_pid_to_str
;
624 child_ops
.to_stop
= child_stop
;
625 child_ops
.to_enable_exception_callback
= child_enable_exception_callback
;
626 child_ops
.to_get_current_exception_event
= child_get_current_exception_event
;
627 child_ops
.to_pid_to_exec_file
= child_pid_to_exec_file
;
628 child_ops
.to_stratum
= process_stratum
;
629 child_ops
.to_has_all_memory
= 1;
630 child_ops
.to_has_memory
= 1;
631 child_ops
.to_has_stack
= 1;
632 child_ops
.to_has_registers
= 1;
633 child_ops
.to_has_execution
= 1;
634 child_ops
.to_magic
= OPS_MAGIC
;
638 _initialize_inftarg (void)
640 #ifdef HAVE_OPTIONAL_PROC_FS
644 /* If we have an optional /proc filesystem (e.g. under OSF/1),
645 don't add ptrace support if we can access the running GDB via /proc. */
646 #ifndef PROC_NAME_FMT
647 #define PROC_NAME_FMT "/proc/%05d"
649 sprintf (procname
, PROC_NAME_FMT
, getpid ());
650 fd
= open (procname
, O_RDONLY
);
659 add_target (&child_ops
);