HAMMER: MFC to 2.0
[dragonfly.git] / contrib / gdb-6.2.1 / gdb / inftarg.c
blob384c04e11e7a522e31a388dea80afdcca07528cb
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. */
27 #include "defs.h"
28 #include "frame.h" /* required by inferior.h */
29 #include "inferior.h"
30 #include "target.h"
31 #include "gdbcore.h"
32 #include "command.h"
33 #include "gdb_stat.h"
34 #include <signal.h>
35 #include <sys/types.h>
36 #include <fcntl.h>
37 #include "observer.h"
38 #include "gdb_wait.h"
39 #include "inflow.h"
41 extern struct symtab_and_line *child_enable_exception_callback (enum
42 exception_event_kind,
43 int);
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);
52 #ifndef CHILD_WAIT
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);
58 #endif
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);
70 #endif
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);
86 #endif
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
97 thread support. */
99 #ifndef CHILD_WAIT
101 /* Wait for child to do something. Return pid of child, or -1 in case
102 of error; store status through argument pointer OURSTATUS. */
104 static ptid_t
105 child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
107 int save_errno;
108 int status;
109 char *execd_pathname = NULL;
110 int exit_status;
111 int related_pid;
112 int syscall_id;
113 enum target_waitkind kind;
114 int pid;
118 set_sigint_trap (); /* Causes SIGINT to be passed on to the
119 attached process. */
120 set_sigio_trap ();
122 pid = ptrace_wait (inferior_ptid, &status);
124 save_errno = errno;
126 clear_sigio_trap ();
128 clear_sigint_trap ();
130 if (pid == -1)
132 if (save_errno == EINTR)
133 continue;
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);
144 /* Did it exit?
146 if (target_has_exited (pid, status, &exit_status))
148 /* ??rehrauer: For now, ignore this. */
149 continue;
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)
165 void
166 child_post_wait (ptid_t ptid, int wait_status)
168 /* This version of Unix doesn't require a meaningful "post wait"
169 operation.
172 #endif
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
181 code. */
183 child_thread_alive (ptid_t ptid)
185 pid_t pid = PIDGET (ptid);
187 return (kill (pid, 0) != -1);
190 #endif
192 /* Attach to process PID, then initialize for debugging it. */
194 static void
195 child_attach (char *args, int from_tty)
197 char *exec_file;
198 int pid;
199 char *dummy;
201 if (!args)
202 error_no_arg ("process-id to attach");
204 dummy = args;
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!");
213 if (from_tty)
215 exec_file = (char *) get_exec_file (0);
217 if (exec_file)
218 printf_unfiltered ("Attaching to program: %s, %s\n", exec_file,
219 target_pid_to_str (pid_to_ptid (pid)));
220 else
221 printf_unfiltered ("Attaching to %s\n",
222 target_pid_to_str (pid_to_ptid (pid)));
224 gdb_flush (gdb_stdout);
227 attach (pid);
229 inferior_ptid = pid_to_ptid (pid);
230 push_target (&child_ops);
233 #if !defined(CHILD_POST_ATTACH)
234 void
235 child_post_attach (int pid)
237 /* This version of Unix doesn't require a meaningful "post attach"
238 operation by a debugger. */
240 #endif
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). */
250 static void
251 child_detach (char *args, int from_tty)
253 int siggnal = 0;
254 int pid = PIDGET (inferior_ptid);
256 if (from_tty)
258 char *exec_file = get_exec_file (0);
259 if (exec_file == 0)
260 exec_file = "";
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);
265 if (args)
266 siggnal = atoi (args);
268 detach (siggnal);
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
278 debugged. */
280 static void
281 child_prepare_to_store (void)
283 #ifdef CHILD_PREPARE_TO_STORE
284 CHILD_PREPARE_TO_STORE ();
285 #endif
288 /* Print status information about what we're accessing. */
290 static void
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));
297 static void
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. */
306 static void
307 ptrace_me (void)
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. */
316 static void
317 ptrace_him (int pid)
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(). */
346 static void
347 child_create_inferior (char *exec_file, char *allargs, char **env,
348 int from_tty)
350 #ifdef HPUXHPPA
351 fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL);
352 #else
353 fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
354 #endif
355 /* We are at the first instruction we care about. */
356 observer_notify_inferior_created (&current_target, from_tty);
357 /* Pedal to the metal... */
358 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
361 #if !defined(CHILD_POST_STARTUP_INFERIOR)
362 void
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.
369 #endif
371 #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
372 void
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.
379 #endif
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. */
387 return 0;
389 #endif
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. */
396 return 0;
398 #endif
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. */
405 return 0;
407 #endif
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. */
414 return 0;
416 #endif
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. */
423 return 0;
425 #endif
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. */
432 return 0;
434 #endif
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. */
441 return 0;
443 #endif
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.
451 return 1;
453 #endif
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);
462 return 1;
465 if (WIFSIGNALED (wait_status))
467 *exit_status = 0; /* ?? Don't know what else to say here. */
468 return 1;
471 /* ?? Do we really need to consult the event state, too? Assume the
472 wait_state alone suffices.
474 return 0;
476 #endif
479 static void
480 child_mourn_inferior (void)
482 unpush_target (&child_ops);
483 generic_mourn_inferior ();
486 static int
487 child_can_run (void)
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). */
502 static void
503 child_stop (void)
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;
514 #endif
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;
522 #endif
525 #if !defined(CHILD_PID_TO_EXEC_FILE)
526 char *
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.
532 return NULL;
534 #endif
536 char *
537 child_core_file_to_sym_file (char *core)
539 /* The target stratum for a running executable need not support
540 this operation.
542 return NULL;
545 /* Perform a partial transfer to/from the specified object. For
546 memory transfers, fall back to the old memory xfer functions. */
548 static LONGEST
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)
553 switch (object)
555 case TARGET_OBJECT_MEMORY:
556 if (readbuf)
557 return child_xfer_memory (offset, readbuf, len, 0/*write*/,
558 NULL, ops);
559 if (writebuf)
560 return child_xfer_memory (offset, readbuf, len, 1/*write*/,
561 NULL, ops);
562 return -1;
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)
567 #endif
568 return NATIVE_XFER_UNWIND_TABLE (ops, object, annex, readbuf, writebuf,
569 offset, len);
571 case TARGET_OBJECT_AUXV:
572 #ifndef NATIVE_XFER_AUXV
573 #define NATIVE_XFER_AUXV(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
574 #endif
575 return NATIVE_XFER_AUXV (ops, object, annex, readbuf, writebuf,
576 offset, len);
578 case TARGET_OBJECT_WCOOKIE:
579 #ifndef NATIVE_XFER_WCOOKIE
580 #define NATIVE_XFER_WCOOKIE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
581 #endif
582 return NATIVE_XFER_WCOOKIE (ops, object, annex, readbuf, writebuf,
583 offset, len);
585 default:
586 return -1;
590 #if !defined(CHILD_PID_TO_STR)
591 char *
592 child_pid_to_str (ptid_t ptid)
594 return normal_pid_to_str (ptid);
596 #endif
598 static void
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. */
656 extern void
657 inftarg_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
658 unsigned long,
659 int, int, int,
660 void *),
661 void *))
663 child_ops.to_find_memory_regions = func;
666 /* Take over the 'make_corefile_notes' vector from inftarg.c. */
667 extern void
668 inftarg_set_make_corefile_notes (char * (*func) (bfd *, int *))
670 child_ops.to_make_corefile_notes = func;
673 void
674 _initialize_inftarg (void)
676 #ifdef HAVE_OPTIONAL_PROC_FS
677 char procname[32];
678 int fd;
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"
684 #endif
685 sprintf (procname, PROC_NAME_FMT, getpid ());
686 fd = open (procname, O_RDONLY);
687 if (fd >= 0)
689 close (fd);
690 return;
692 #endif
694 init_child_ops ();
695 add_target (&child_ops);