1 /* GNU/Linux native-dependent code common to multiple platforms.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
26 #include "gdb_assert.h"
27 #ifdef HAVE_TKILL_SYSCALL
29 #include <sys/syscall.h>
31 #include <sys/ptrace.h>
32 #include "linux-nat.h"
33 #include "linux-fork.h"
34 #include "gdbthread.h"
38 #include "inf-ptrace.h"
40 #include <sys/param.h> /* for MAXPATHLEN */
41 #include <sys/procfs.h> /* for elf_gregset etc. */
42 #include "elf-bfd.h" /* for elfcore_write_* */
43 #include "gregset.h" /* for gregset */
44 #include "gdbcore.h" /* for get_exec_file */
45 #include <ctype.h> /* for isdigit */
46 #include "gdbthread.h" /* for struct thread_info etc. */
47 #include "gdb_stat.h" /* for struct stat */
48 #include <fcntl.h> /* for O_RDONLY */
50 #include "event-loop.h"
51 #include "event-top.h"
53 #include <sys/types.h>
54 #include "gdb_dirent.h"
55 #include "xml-support.h"
61 #define SPUFS_MAGIC 0x23c9b64e
64 #ifdef HAVE_PERSONALITY
65 # include <sys/personality.h>
66 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
67 # define ADDR_NO_RANDOMIZE 0x0040000
69 #endif /* HAVE_PERSONALITY */
71 /* This comment documents high-level logic of this file.
73 Waiting for events in sync mode
74 ===============================
76 When waiting for an event in a specific thread, we just use waitpid, passing
77 the specific pid, and not passing WNOHANG.
79 When waiting for an event in all threads, waitpid is not quite good. Prior to
80 version 2.4, Linux can either wait for event in main thread, or in secondary
81 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
82 miss an event. The solution is to use non-blocking waitpid, together with
83 sigsuspend. First, we use non-blocking waitpid to get an event in the main
84 process, if any. Second, we use non-blocking waitpid with the __WCLONED
85 flag to check for events in cloned processes. If nothing is found, we use
86 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
87 happened to a child process -- and SIGCHLD will be delivered both for events
88 in main debugged process and in cloned processes. As soon as we know there's
89 an event, we get back to calling nonblocking waitpid with and without __WCLONED.
91 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
92 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
93 blocked, the signal becomes pending and sigsuspend immediately
94 notices it and returns.
96 Waiting for events in async mode
97 ================================
99 In async mode, GDB should always be ready to handle both user input
100 and target events, so neither blocking waitpid nor sigsuspend are
101 viable options. Instead, we should asynchronously notify the GDB main
102 event loop whenever there's an unprocessed event from the target. We
103 detect asynchronous target events by handling SIGCHLD signals. To
104 notify the event loop about target events, the self-pipe trick is used
105 --- a pipe is registered as waitable event source in the event loop,
106 the event loop select/poll's on the read end of this pipe (as well on
107 other event sources, e.g., stdin), and the SIGCHLD handler writes a
108 byte to this pipe. This is more portable than relying on
109 pselect/ppoll, since on kernels that lack those syscalls, libc
110 emulates them with select/poll+sigprocmask, and that is racy
111 (a.k.a. plain broken).
113 Obviously, if we fail to notify the event loop if there's a target
114 event, it's bad. OTOH, if we notify the event loop when there's no
115 event from the target, linux_nat_wait will detect that there's no real
116 event to report, and return event of type TARGET_WAITKIND_IGNORE.
117 This is mostly harmless, but it will waste time and is better avoided.
119 The main design point is that every time GDB is outside linux-nat.c,
120 we have a SIGCHLD handler installed that is called when something
121 happens to the target and notifies the GDB event loop. Whenever GDB
122 core decides to handle the event, and calls into linux-nat.c, we
123 process things as in sync mode, except that the we never block in
126 While processing an event, we may end up momentarily blocked in
127 waitpid calls. Those waitpid calls, while blocking, are guarantied to
128 return quickly. E.g., in all-stop mode, before reporting to the core
129 that an LWP hit a breakpoint, all LWPs are stopped by sending them
130 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
131 Note that this is different from blocking indefinitely waiting for the
132 next event --- here, we're already handling an event.
137 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
138 signal is not entirely significant; we just need for a signal to be delivered,
139 so that we can intercept it. SIGSTOP's advantage is that it can not be
140 blocked. A disadvantage is that it is not a real-time signal, so it can only
141 be queued once; we do not keep track of other sources of SIGSTOP.
143 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
144 use them, because they have special behavior when the signal is generated -
145 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
146 kills the entire thread group.
148 A delivered SIGSTOP would stop the entire thread group, not just the thread we
149 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
150 cancel it (by PTRACE_CONT without passing SIGSTOP).
152 We could use a real-time signal instead. This would solve those problems; we
153 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
154 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
155 generates it, and there are races with trying to find a signal that is not
159 #define O_LARGEFILE 0
162 /* If the system headers did not provide the constants, hard-code the normal
164 #ifndef PTRACE_EVENT_FORK
166 #define PTRACE_SETOPTIONS 0x4200
167 #define PTRACE_GETEVENTMSG 0x4201
169 /* options set using PTRACE_SETOPTIONS */
170 #define PTRACE_O_TRACESYSGOOD 0x00000001
171 #define PTRACE_O_TRACEFORK 0x00000002
172 #define PTRACE_O_TRACEVFORK 0x00000004
173 #define PTRACE_O_TRACECLONE 0x00000008
174 #define PTRACE_O_TRACEEXEC 0x00000010
175 #define PTRACE_O_TRACEVFORKDONE 0x00000020
176 #define PTRACE_O_TRACEEXIT 0x00000040
178 /* Wait extended result codes for the above trace options. */
179 #define PTRACE_EVENT_FORK 1
180 #define PTRACE_EVENT_VFORK 2
181 #define PTRACE_EVENT_CLONE 3
182 #define PTRACE_EVENT_EXEC 4
183 #define PTRACE_EVENT_VFORK_DONE 5
184 #define PTRACE_EVENT_EXIT 6
186 #endif /* PTRACE_EVENT_FORK */
188 /* Unlike other extended result codes, WSTOPSIG (status) on
189 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
190 instead SIGTRAP with bit 7 set. */
191 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
193 /* We can't always assume that this flag is available, but all systems
194 with the ptrace event handlers also have __WALL, so it's safe to use
197 #define __WALL 0x40000000 /* Wait for any child. */
200 #ifndef PTRACE_GETSIGINFO
201 # define PTRACE_GETSIGINFO 0x4202
202 # define PTRACE_SETSIGINFO 0x4203
205 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
206 the use of the multi-threaded target. */
207 static struct target_ops
*linux_ops
;
208 static struct target_ops linux_ops_saved
;
210 /* The method to call, if any, when a new thread is attached. */
211 static void (*linux_nat_new_thread
) (ptid_t
);
213 /* The method to call, if any, when the siginfo object needs to be
214 converted between the layout returned by ptrace, and the layout in
215 the architecture of the inferior. */
216 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
220 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
221 Called by our to_xfer_partial. */
222 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
224 const char *, gdb_byte
*,
228 static int debug_linux_nat
;
230 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
231 struct cmd_list_element
*c
, const char *value
)
233 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
237 static int debug_linux_nat_async
= 0;
239 show_debug_linux_nat_async (struct ui_file
*file
, int from_tty
,
240 struct cmd_list_element
*c
, const char *value
)
242 fprintf_filtered (file
, _("Debugging of GNU/Linux async lwp module is %s.\n"),
246 static int disable_randomization
= 1;
249 show_disable_randomization (struct ui_file
*file
, int from_tty
,
250 struct cmd_list_element
*c
, const char *value
)
252 #ifdef HAVE_PERSONALITY
253 fprintf_filtered (file
, _("\
254 Disabling randomization of debuggee's virtual address space is %s.\n"),
256 #else /* !HAVE_PERSONALITY */
258 Disabling randomization of debuggee's virtual address space is unsupported on\n\
259 this platform.\n"), file
);
260 #endif /* !HAVE_PERSONALITY */
264 set_disable_randomization (char *args
, int from_tty
, struct cmd_list_element
*c
)
266 #ifndef HAVE_PERSONALITY
268 Disabling randomization of debuggee's virtual address space is unsupported on\n\
270 #endif /* !HAVE_PERSONALITY */
273 static int linux_parent_pid
;
275 struct simple_pid_list
279 struct simple_pid_list
*next
;
281 struct simple_pid_list
*stopped_pids
;
283 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
284 can not be used, 1 if it can. */
286 static int linux_supports_tracefork_flag
= -1;
288 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD
289 can not be used, 1 if it can. */
291 static int linux_supports_tracesysgood_flag
= -1;
293 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
294 PTRACE_O_TRACEVFORKDONE. */
296 static int linux_supports_tracevforkdone_flag
= -1;
298 /* Async mode support */
300 /* Zero if the async mode, although enabled, is masked, which means
301 linux_nat_wait should behave as if async mode was off. */
302 static int linux_nat_async_mask_value
= 1;
304 /* Stores the current used ptrace() options. */
305 static int current_ptrace_options
= 0;
307 /* The read/write ends of the pipe registered as waitable file in the
309 static int linux_nat_event_pipe
[2] = { -1, -1 };
311 /* Flush the event pipe. */
314 async_file_flush (void)
321 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
323 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
326 /* Put something (anything, doesn't matter what, or how much) in event
327 pipe, so that the select/poll in the event-loop realizes we have
328 something to process. */
331 async_file_mark (void)
335 /* It doesn't really matter what the pipe contains, as long we end
336 up with something in it. Might as well flush the previous
342 ret
= write (linux_nat_event_pipe
[1], "+", 1);
344 while (ret
== -1 && errno
== EINTR
);
346 /* Ignore EAGAIN. If the pipe is full, the event loop will already
347 be awakened anyway. */
350 static void linux_nat_async (void (*callback
)
351 (enum inferior_event_type event_type
, void *context
),
353 static int linux_nat_async_mask (int mask
);
354 static int kill_lwp (int lwpid
, int signo
);
356 static int stop_callback (struct lwp_info
*lp
, void *data
);
358 static void block_child_signals (sigset_t
*prev_mask
);
359 static void restore_child_signals_mask (sigset_t
*prev_mask
);
362 static struct lwp_info
*add_lwp (ptid_t ptid
);
363 static void purge_lwp_list (int pid
);
364 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
367 /* Trivial list manipulation functions to keep track of a list of
368 new stopped processes. */
370 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
372 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
374 new_pid
->status
= status
;
375 new_pid
->next
= *listp
;
380 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *status
)
382 struct simple_pid_list
**p
;
384 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
385 if ((*p
)->pid
== pid
)
387 struct simple_pid_list
*next
= (*p
)->next
;
388 *status
= (*p
)->status
;
397 linux_record_stopped_pid (int pid
, int status
)
399 add_to_pid_list (&stopped_pids
, pid
, status
);
403 /* A helper function for linux_test_for_tracefork, called after fork (). */
406 linux_tracefork_child (void)
410 ptrace (PTRACE_TRACEME
, 0, 0, 0);
411 kill (getpid (), SIGSTOP
);
416 /* Wrapper function for waitpid which handles EINTR. */
419 my_waitpid (int pid
, int *status
, int flags
)
425 ret
= waitpid (pid
, status
, flags
);
427 while (ret
== -1 && errno
== EINTR
);
432 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
434 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
435 we know that the feature is not available. This may change the tracing
436 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
438 However, if it succeeds, we don't know for sure that the feature is
439 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
440 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
441 fork tracing, and let it fork. If the process exits, we assume that we
442 can't use TRACEFORK; if we get the fork notification, and we can extract
443 the new child's PID, then we assume that we can. */
446 linux_test_for_tracefork (int original_pid
)
448 int child_pid
, ret
, status
;
452 /* We don't want those ptrace calls to be interrupted. */
453 block_child_signals (&prev_mask
);
455 linux_supports_tracefork_flag
= 0;
456 linux_supports_tracevforkdone_flag
= 0;
458 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
461 restore_child_signals_mask (&prev_mask
);
467 perror_with_name (("fork"));
470 linux_tracefork_child ();
472 ret
= my_waitpid (child_pid
, &status
, 0);
474 perror_with_name (("waitpid"));
475 else if (ret
!= child_pid
)
476 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
477 if (! WIFSTOPPED (status
))
478 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status
);
480 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
483 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
486 warning (_("linux_test_for_tracefork: failed to kill child"));
487 restore_child_signals_mask (&prev_mask
);
491 ret
= my_waitpid (child_pid
, &status
, 0);
492 if (ret
!= child_pid
)
493 warning (_("linux_test_for_tracefork: failed to wait for killed child"));
494 else if (!WIFSIGNALED (status
))
495 warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
496 "killed child"), status
);
498 restore_child_signals_mask (&prev_mask
);
502 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
503 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
504 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
505 linux_supports_tracevforkdone_flag
= (ret
== 0);
507 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
509 warning (_("linux_test_for_tracefork: failed to resume child"));
511 ret
= my_waitpid (child_pid
, &status
, 0);
513 if (ret
== child_pid
&& WIFSTOPPED (status
)
514 && status
>> 16 == PTRACE_EVENT_FORK
)
517 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
518 if (ret
== 0 && second_pid
!= 0)
522 linux_supports_tracefork_flag
= 1;
523 my_waitpid (second_pid
, &second_status
, 0);
524 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
526 warning (_("linux_test_for_tracefork: failed to kill second child"));
527 my_waitpid (second_pid
, &status
, 0);
531 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
532 "(%d, status 0x%x)"), ret
, status
);
534 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
536 warning (_("linux_test_for_tracefork: failed to kill child"));
537 my_waitpid (child_pid
, &status
, 0);
539 restore_child_signals_mask (&prev_mask
);
542 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
544 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
545 we know that the feature is not available. This may change the tracing
546 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
549 linux_test_for_tracesysgood (int original_pid
)
554 /* We don't want those ptrace calls to be interrupted. */
555 block_child_signals (&prev_mask
);
557 linux_supports_tracesysgood_flag
= 0;
559 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
563 linux_supports_tracesysgood_flag
= 1;
565 restore_child_signals_mask (&prev_mask
);
568 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
569 This function also sets linux_supports_tracesysgood_flag. */
572 linux_supports_tracesysgood (int pid
)
574 if (linux_supports_tracesysgood_flag
== -1)
575 linux_test_for_tracesysgood (pid
);
576 return linux_supports_tracesysgood_flag
;
579 /* Return non-zero iff we have tracefork functionality available.
580 This function also sets linux_supports_tracefork_flag. */
583 linux_supports_tracefork (int pid
)
585 if (linux_supports_tracefork_flag
== -1)
586 linux_test_for_tracefork (pid
);
587 return linux_supports_tracefork_flag
;
591 linux_supports_tracevforkdone (int pid
)
593 if (linux_supports_tracefork_flag
== -1)
594 linux_test_for_tracefork (pid
);
595 return linux_supports_tracevforkdone_flag
;
599 linux_enable_tracesysgood (ptid_t ptid
)
601 int pid
= ptid_get_lwp (ptid
);
604 pid
= ptid_get_pid (ptid
);
606 if (linux_supports_tracesysgood (pid
) == 0)
609 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
611 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
616 linux_enable_event_reporting (ptid_t ptid
)
618 int pid
= ptid_get_lwp (ptid
);
621 pid
= ptid_get_pid (ptid
);
623 if (! linux_supports_tracefork (pid
))
626 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
627 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
629 if (linux_supports_tracevforkdone (pid
))
630 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
632 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
633 read-only process state. */
635 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
639 linux_child_post_attach (int pid
)
641 linux_enable_event_reporting (pid_to_ptid (pid
));
642 check_for_thread_db ();
643 linux_enable_tracesysgood (pid_to_ptid (pid
));
647 linux_child_post_startup_inferior (ptid_t ptid
)
649 linux_enable_event_reporting (ptid
);
650 check_for_thread_db ();
651 linux_enable_tracesysgood (ptid
);
655 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
659 int parent_pid
, child_pid
;
661 block_child_signals (&prev_mask
);
663 has_vforked
= (inferior_thread ()->pending_follow
.kind
664 == TARGET_WAITKIND_VFORKED
);
665 parent_pid
= ptid_get_lwp (inferior_ptid
);
667 parent_pid
= ptid_get_pid (inferior_ptid
);
668 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
671 linux_enable_event_reporting (pid_to_ptid (child_pid
));
674 && !non_stop
/* Non-stop always resumes both branches. */
675 && (!target_is_async_p () || sync_execution
)
676 && !(follow_child
|| detach_fork
|| sched_multi
))
678 /* The parent stays blocked inside the vfork syscall until the
679 child execs or exits. If we don't let the child run, then
680 the parent stays blocked. If we're telling the parent to run
681 in the foreground, the user will not be able to ctrl-c to get
682 back the terminal, effectively hanging the debug session. */
683 fprintf_filtered (gdb_stderr
, _("\
684 Can not resume the parent process over vfork in the foreground while \n\
685 holding the child stopped. Try \"set detach-on-fork\" or \
686 \"set schedule-multiple\".\n"));
692 struct lwp_info
*child_lp
= NULL
;
694 /* We're already attached to the parent, by default. */
696 /* Detach new forked process? */
699 /* Before detaching from the child, remove all breakpoints
700 from it. If we forked, then this has already been taken
701 care of by infrun.c. If we vforked however, any
702 breakpoint inserted in the parent is visible in the
703 child, even those added while stopped in a vfork
704 catchpoint. This will remove the breakpoints from the
705 parent also, but they'll be reinserted below. */
708 /* keep breakpoints list in sync. */
709 remove_breakpoints_pid (GET_PID (inferior_ptid
));
712 if (info_verbose
|| debug_linux_nat
)
714 target_terminal_ours ();
715 fprintf_filtered (gdb_stdlog
,
716 "Detaching after fork from child process %d.\n",
720 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
724 struct inferior
*parent_inf
, *child_inf
;
725 struct cleanup
*old_chain
;
727 /* Add process to GDB's tables. */
728 child_inf
= add_inferior (child_pid
);
730 parent_inf
= current_inferior ();
731 child_inf
->attach_flag
= parent_inf
->attach_flag
;
732 copy_terminal_info (child_inf
, parent_inf
);
734 old_chain
= save_inferior_ptid ();
735 save_current_program_space ();
737 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
738 add_thread (inferior_ptid
);
739 child_lp
= add_lwp (inferior_ptid
);
740 child_lp
->stopped
= 1;
741 child_lp
->resumed
= 1;
743 /* If this is a vfork child, then the address-space is
744 shared with the parent. */
747 child_inf
->pspace
= parent_inf
->pspace
;
748 child_inf
->aspace
= parent_inf
->aspace
;
750 /* The parent will be frozen until the child is done
751 with the shared region. Keep track of the
753 child_inf
->vfork_parent
= parent_inf
;
754 child_inf
->pending_detach
= 0;
755 parent_inf
->vfork_child
= child_inf
;
756 parent_inf
->pending_detach
= 0;
760 child_inf
->aspace
= new_address_space ();
761 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
762 child_inf
->removable
= 1;
763 set_current_program_space (child_inf
->pspace
);
764 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
766 /* Let the shared library layer (solib-svr4) learn about
767 this new process, relocate the cloned exec, pull in
768 shared libraries, and install the solib event
769 breakpoint. If a "cloned-VM" event was propagated
770 better throughout the core, this wouldn't be
772 solib_create_inferior_hook (0);
775 /* Let the thread_db layer learn about this new process. */
776 check_for_thread_db ();
778 do_cleanups (old_chain
);
784 struct inferior
*parent_inf
;
786 parent_inf
= current_inferior ();
788 /* If we detached from the child, then we have to be careful
789 to not insert breakpoints in the parent until the child
790 is done with the shared memory region. However, if we're
791 staying attached to the child, then we can and should
792 insert breakpoints, so that we can debug it. A
793 subsequent child exec or exit is enough to know when does
794 the child stops using the parent's address space. */
795 parent_inf
->waiting_for_vfork_done
= detach_fork
;
796 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
798 lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
799 gdb_assert (linux_supports_tracefork_flag
>= 0);
800 if (linux_supports_tracevforkdone (0))
803 fprintf_unfiltered (gdb_stdlog
,
804 "LCFF: waiting for VFORK_DONE on %d\n",
810 /* We'll handle the VFORK_DONE event like any other
811 event, in target_wait. */
815 /* We can't insert breakpoints until the child has
816 finished with the shared memory region. We need to
817 wait until that happens. Ideal would be to just
819 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
820 - waitpid (parent_pid, &status, __WALL);
821 However, most architectures can't handle a syscall
822 being traced on the way out if it wasn't traced on
825 We might also think to loop, continuing the child
826 until it exits or gets a SIGTRAP. One problem is
827 that the child might call ptrace with PTRACE_TRACEME.
829 There's no simple and reliable way to figure out when
830 the vforked child will be done with its copy of the
831 shared memory. We could step it out of the syscall,
832 two instructions, let it go, and then single-step the
833 parent once. When we have hardware single-step, this
834 would work; with software single-step it could still
835 be made to work but we'd have to be able to insert
836 single-step breakpoints in the child, and we'd have
837 to insert -just- the single-step breakpoint in the
838 parent. Very awkward.
840 In the end, the best we can do is to make sure it
841 runs for a little while. Hopefully it will be out of
842 range of any breakpoints we reinsert. Usually this
843 is only the single-step breakpoint at vfork's return
847 fprintf_unfiltered (gdb_stdlog
,
848 "LCFF: no VFORK_DONE support, sleeping a bit\n");
852 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
853 and leave it pending. The next linux_nat_resume call
854 will notice a pending event, and bypasses actually
855 resuming the inferior. */
857 lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
861 /* If we're in async mode, need to tell the event loop
862 there's something here to process. */
863 if (target_can_async_p ())
870 struct thread_info
*tp
;
871 struct inferior
*parent_inf
, *child_inf
;
873 struct program_space
*parent_pspace
;
875 if (info_verbose
|| debug_linux_nat
)
877 target_terminal_ours ();
879 fprintf_filtered (gdb_stdlog
, _("\
880 Attaching after process %d vfork to child process %d.\n"),
881 parent_pid
, child_pid
);
883 fprintf_filtered (gdb_stdlog
, _("\
884 Attaching after process %d fork to child process %d.\n"),
885 parent_pid
, child_pid
);
888 /* Add the new inferior first, so that the target_detach below
889 doesn't unpush the target. */
891 child_inf
= add_inferior (child_pid
);
893 parent_inf
= current_inferior ();
894 child_inf
->attach_flag
= parent_inf
->attach_flag
;
895 copy_terminal_info (child_inf
, parent_inf
);
897 parent_pspace
= parent_inf
->pspace
;
899 /* If we're vforking, we want to hold on to the parent until the
900 child exits or execs. At child exec or exit time we can
901 remove the old breakpoints from the parent and detach or
902 resume debugging it. Otherwise, detach the parent now; we'll
903 want to reuse it's program/address spaces, but we can't set
904 them to the child before removing breakpoints from the
905 parent, otherwise, the breakpoints module could decide to
906 remove breakpoints from the wrong process (since they'd be
907 assigned to the same address space). */
911 gdb_assert (child_inf
->vfork_parent
== NULL
);
912 gdb_assert (parent_inf
->vfork_child
== NULL
);
913 child_inf
->vfork_parent
= parent_inf
;
914 child_inf
->pending_detach
= 0;
915 parent_inf
->vfork_child
= child_inf
;
916 parent_inf
->pending_detach
= detach_fork
;
917 parent_inf
->waiting_for_vfork_done
= 0;
919 else if (detach_fork
)
920 target_detach (NULL
, 0);
922 /* Note that the detach above makes PARENT_INF dangling. */
924 /* Add the child thread to the appropriate lists, and switch to
925 this new thread, before cloning the program space, and
926 informing the solib layer about this new process. */
928 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
929 add_thread (inferior_ptid
);
930 lp
= add_lwp (inferior_ptid
);
934 /* If this is a vfork child, then the address-space is shared
935 with the parent. If we detached from the parent, then we can
936 reuse the parent's program/address spaces. */
937 if (has_vforked
|| detach_fork
)
939 child_inf
->pspace
= parent_pspace
;
940 child_inf
->aspace
= child_inf
->pspace
->aspace
;
944 child_inf
->aspace
= new_address_space ();
945 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
946 child_inf
->removable
= 1;
947 set_current_program_space (child_inf
->pspace
);
948 clone_program_space (child_inf
->pspace
, parent_pspace
);
950 /* Let the shared library layer (solib-svr4) learn about
951 this new process, relocate the cloned exec, pull in
952 shared libraries, and install the solib event breakpoint.
953 If a "cloned-VM" event was propagated better throughout
954 the core, this wouldn't be required. */
955 solib_create_inferior_hook (0);
958 /* Let the thread_db layer learn about this new process. */
959 check_for_thread_db ();
962 restore_child_signals_mask (&prev_mask
);
968 linux_child_insert_fork_catchpoint (int pid
)
970 if (! linux_supports_tracefork (pid
))
971 error (_("Your system does not support fork catchpoints."));
975 linux_child_insert_vfork_catchpoint (int pid
)
977 if (!linux_supports_tracefork (pid
))
978 error (_("Your system does not support vfork catchpoints."));
982 linux_child_insert_exec_catchpoint (int pid
)
984 if (!linux_supports_tracefork (pid
))
985 error (_("Your system does not support exec catchpoints."));
989 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
990 int table_size
, int *table
)
992 if (! linux_supports_tracesysgood (pid
))
993 error (_("Your system does not support syscall catchpoints."));
994 /* On GNU/Linux, we ignore the arguments. It means that we only
995 enable the syscall catchpoints, but do not disable them.
997 Also, we do not use the `table' information because we do not
998 filter system calls here. We let GDB do the logic for us. */
1002 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
1003 are processes sharing the same VM space. A multi-threaded process
1004 is basically a group of such processes. However, such a grouping
1005 is almost entirely a user-space issue; the kernel doesn't enforce
1006 such a grouping at all (this might change in the future). In
1007 general, we'll rely on the threads library (i.e. the GNU/Linux
1008 Threads library) to provide such a grouping.
1010 It is perfectly well possible to write a multi-threaded application
1011 without the assistance of a threads library, by using the clone
1012 system call directly. This module should be able to give some
1013 rudimentary support for debugging such applications if developers
1014 specify the CLONE_PTRACE flag in the clone system call, and are
1015 using the Linux kernel 2.4 or above.
1017 Note that there are some peculiarities in GNU/Linux that affect
1020 - In general one should specify the __WCLONE flag to waitpid in
1021 order to make it report events for any of the cloned processes
1022 (and leave it out for the initial process). However, if a cloned
1023 process has exited the exit status is only reported if the
1024 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
1025 we cannot use it since GDB must work on older systems too.
1027 - When a traced, cloned process exits and is waited for by the
1028 debugger, the kernel reassigns it to the original parent and
1029 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1030 library doesn't notice this, which leads to the "zombie problem":
1031 When debugged a multi-threaded process that spawns a lot of
1032 threads will run out of processes, even if the threads exit,
1033 because the "zombies" stay around. */
1035 /* List of known LWPs. */
1036 struct lwp_info
*lwp_list
;
1039 /* Original signal mask. */
1040 static sigset_t normal_mask
;
1042 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1043 _initialize_linux_nat. */
1044 static sigset_t suspend_mask
;
1046 /* Signals to block to make that sigsuspend work. */
1047 static sigset_t blocked_mask
;
1049 /* SIGCHLD action. */
1050 struct sigaction sigchld_action
;
1052 /* Block child signals (SIGCHLD and linux threads signals), and store
1053 the previous mask in PREV_MASK. */
1056 block_child_signals (sigset_t
*prev_mask
)
1058 /* Make sure SIGCHLD is blocked. */
1059 if (!sigismember (&blocked_mask
, SIGCHLD
))
1060 sigaddset (&blocked_mask
, SIGCHLD
);
1062 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1065 /* Restore child signals mask, previously returned by
1066 block_child_signals. */
1069 restore_child_signals_mask (sigset_t
*prev_mask
)
1071 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1075 /* Prototypes for local functions. */
1076 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1077 static int linux_thread_alive (ptid_t ptid
);
1078 static char *linux_child_pid_to_exec_file (int pid
);
1079 static int cancel_breakpoint (struct lwp_info
*lp
);
1082 /* Convert wait status STATUS to a string. Used for printing debug
1086 status_to_str (int status
)
1088 static char buf
[64];
1090 if (WIFSTOPPED (status
))
1092 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1093 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1094 strsignal (SIGTRAP
));
1096 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1097 strsignal (WSTOPSIG (status
)));
1099 else if (WIFSIGNALED (status
))
1100 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1101 strsignal (WSTOPSIG (status
)));
1103 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1108 /* Remove all LWPs belong to PID from the lwp list. */
1111 purge_lwp_list (int pid
)
1113 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1117 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1121 if (ptid_get_pid (lp
->ptid
) == pid
)
1124 lwp_list
= lp
->next
;
1126 lpprev
->next
= lp
->next
;
1135 /* Return the number of known LWPs in the tgid given by PID. */
1141 struct lwp_info
*lp
;
1143 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1144 if (ptid_get_pid (lp
->ptid
) == pid
)
1150 /* Add the LWP specified by PID to the list. Return a pointer to the
1151 structure describing the new LWP. The LWP should already be stopped
1152 (with an exception for the very first LWP). */
1154 static struct lwp_info
*
1155 add_lwp (ptid_t ptid
)
1157 struct lwp_info
*lp
;
1159 gdb_assert (is_lwp (ptid
));
1161 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1163 memset (lp
, 0, sizeof (struct lwp_info
));
1165 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1170 lp
->next
= lwp_list
;
1173 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1174 linux_nat_new_thread (ptid
);
1179 /* Remove the LWP specified by PID from the list. */
1182 delete_lwp (ptid_t ptid
)
1184 struct lwp_info
*lp
, *lpprev
;
1188 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1189 if (ptid_equal (lp
->ptid
, ptid
))
1196 lpprev
->next
= lp
->next
;
1198 lwp_list
= lp
->next
;
1203 /* Return a pointer to the structure describing the LWP corresponding
1204 to PID. If no corresponding LWP could be found, return NULL. */
1206 static struct lwp_info
*
1207 find_lwp_pid (ptid_t ptid
)
1209 struct lwp_info
*lp
;
1213 lwp
= GET_LWP (ptid
);
1215 lwp
= GET_PID (ptid
);
1217 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1218 if (lwp
== GET_LWP (lp
->ptid
))
1224 /* Returns true if PTID matches filter FILTER. FILTER can be the wild
1225 card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
1226 a process (ptid_is_pid returns true), in which case, all lwps of
1227 that give process match, lwps of other process do not; or, it can
1228 represent a specific thread, in which case, only that thread will
1229 match true. PTID must represent an LWP, it can never be a wild
1233 ptid_match (ptid_t ptid
, ptid_t filter
)
1235 /* Since both parameters have the same type, prevent easy mistakes
1237 gdb_assert (!ptid_equal (ptid
, minus_one_ptid
)
1238 && !ptid_equal (ptid
, null_ptid
));
1240 if (ptid_equal (filter
, minus_one_ptid
))
1242 if (ptid_is_pid (filter
)
1243 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
1245 else if (ptid_equal (ptid
, filter
))
1251 /* Call CALLBACK with its second argument set to DATA for every LWP in
1252 the list. If CALLBACK returns 1 for a particular LWP, return a
1253 pointer to the structure describing that LWP immediately.
1254 Otherwise return NULL. */
1257 iterate_over_lwps (ptid_t filter
,
1258 int (*callback
) (struct lwp_info
*, void *),
1261 struct lwp_info
*lp
, *lpnext
;
1263 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1267 if (ptid_match (lp
->ptid
, filter
))
1269 if ((*callback
) (lp
, data
))
1277 /* Update our internal state when changing from one checkpoint to
1278 another indicated by NEW_PTID. We can only switch single-threaded
1279 applications, so we only create one new LWP, and the previous list
1283 linux_nat_switch_fork (ptid_t new_ptid
)
1285 struct lwp_info
*lp
;
1287 purge_lwp_list (GET_PID (inferior_ptid
));
1289 lp
= add_lwp (new_ptid
);
1292 /* This changes the thread's ptid while preserving the gdb thread
1293 num. Also changes the inferior pid, while preserving the
1295 thread_change_ptid (inferior_ptid
, new_ptid
);
1297 /* We've just told GDB core that the thread changed target id, but,
1298 in fact, it really is a different thread, with different register
1300 registers_changed ();
1303 /* Handle the exit of a single thread LP. */
1306 exit_lwp (struct lwp_info
*lp
)
1308 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1312 if (print_thread_events
)
1313 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1315 delete_thread (lp
->ptid
);
1318 delete_lwp (lp
->ptid
);
1321 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1324 linux_proc_get_tgid (int lwpid
)
1330 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1331 status_file
= fopen (buf
, "r");
1332 if (status_file
!= NULL
)
1334 while (fgets (buf
, sizeof (buf
), status_file
))
1336 if (strncmp (buf
, "Tgid:", 5) == 0)
1338 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1343 fclose (status_file
);
1349 /* Detect `T (stopped)' in `/proc/PID/status'.
1350 Other states including `T (tracing stop)' are reported as false. */
1353 pid_is_stopped (pid_t pid
)
1359 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1360 status_file
= fopen (buf
, "r");
1361 if (status_file
!= NULL
)
1365 while (fgets (buf
, sizeof (buf
), status_file
))
1367 if (strncmp (buf
, "State:", 6) == 0)
1373 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1375 fclose (status_file
);
1380 /* Wait for the LWP specified by LP, which we have just attached to.
1381 Returns a wait status for that LWP, to cache. */
1384 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1387 pid_t new_pid
, pid
= GET_LWP (ptid
);
1390 if (pid_is_stopped (pid
))
1392 if (debug_linux_nat
)
1393 fprintf_unfiltered (gdb_stdlog
,
1394 "LNPAW: Attaching to a stopped process\n");
1396 /* The process is definitely stopped. It is in a job control
1397 stop, unless the kernel predates the TASK_STOPPED /
1398 TASK_TRACED distinction, in which case it might be in a
1399 ptrace stop. Make sure it is in a ptrace stop; from there we
1400 can kill it, signal it, et cetera.
1402 First make sure there is a pending SIGSTOP. Since we are
1403 already attached, the process can not transition from stopped
1404 to running without a PTRACE_CONT; so we know this signal will
1405 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1406 probably already in the queue (unless this kernel is old
1407 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1408 is not an RT signal, it can only be queued once. */
1409 kill_lwp (pid
, SIGSTOP
);
1411 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1412 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1413 ptrace (PTRACE_CONT
, pid
, 0, 0);
1416 /* Make sure the initial process is stopped. The user-level threads
1417 layer might want to poke around in the inferior, and that won't
1418 work if things haven't stabilized yet. */
1419 new_pid
= my_waitpid (pid
, &status
, 0);
1420 if (new_pid
== -1 && errno
== ECHILD
)
1423 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1425 /* Try again with __WCLONE to check cloned processes. */
1426 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1430 gdb_assert (pid
== new_pid
);
1432 if (!WIFSTOPPED (status
))
1434 /* The pid we tried to attach has apparently just exited. */
1435 if (debug_linux_nat
)
1436 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1437 pid
, status_to_str (status
));
1441 if (WSTOPSIG (status
) != SIGSTOP
)
1444 if (debug_linux_nat
)
1445 fprintf_unfiltered (gdb_stdlog
,
1446 "LNPAW: Received %s after attaching\n",
1447 status_to_str (status
));
1453 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1454 if the new LWP could not be attached. */
1457 lin_lwp_attach_lwp (ptid_t ptid
)
1459 struct lwp_info
*lp
;
1462 gdb_assert (is_lwp (ptid
));
1464 block_child_signals (&prev_mask
);
1466 lp
= find_lwp_pid (ptid
);
1468 /* We assume that we're already attached to any LWP that has an id
1469 equal to the overall process id, and to any LWP that is already
1470 in our list of LWPs. If we're not seeing exit events from threads
1471 and we've had PID wraparound since we last tried to stop all threads,
1472 this assumption might be wrong; fortunately, this is very unlikely
1474 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1476 int status
, cloned
= 0, signalled
= 0;
1478 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1480 /* If we fail to attach to the thread, issue a warning,
1481 but continue. One way this can happen is if thread
1482 creation is interrupted; as of Linux kernel 2.6.19, a
1483 bug may place threads in the thread list and then fail
1485 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1486 safe_strerror (errno
));
1487 restore_child_signals_mask (&prev_mask
);
1491 if (debug_linux_nat
)
1492 fprintf_unfiltered (gdb_stdlog
,
1493 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1494 target_pid_to_str (ptid
));
1496 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1497 if (!WIFSTOPPED (status
))
1500 lp
= add_lwp (ptid
);
1502 lp
->cloned
= cloned
;
1503 lp
->signalled
= signalled
;
1504 if (WSTOPSIG (status
) != SIGSTOP
)
1507 lp
->status
= status
;
1510 target_post_attach (GET_LWP (lp
->ptid
));
1512 if (debug_linux_nat
)
1514 fprintf_unfiltered (gdb_stdlog
,
1515 "LLAL: waitpid %s received %s\n",
1516 target_pid_to_str (ptid
),
1517 status_to_str (status
));
1522 /* We assume that the LWP representing the original process is
1523 already stopped. Mark it as stopped in the data structure
1524 that the GNU/linux ptrace layer uses to keep track of
1525 threads. Note that this won't have already been done since
1526 the main thread will have, we assume, been stopped by an
1527 attach from a different layer. */
1529 lp
= add_lwp (ptid
);
1533 restore_child_signals_mask (&prev_mask
);
1538 linux_nat_create_inferior (struct target_ops
*ops
,
1539 char *exec_file
, char *allargs
, char **env
,
1542 #ifdef HAVE_PERSONALITY
1543 int personality_orig
= 0, personality_set
= 0;
1544 #endif /* HAVE_PERSONALITY */
1546 /* The fork_child mechanism is synchronous and calls target_wait, so
1547 we have to mask the async mode. */
1549 #ifdef HAVE_PERSONALITY
1550 if (disable_randomization
)
1553 personality_orig
= personality (0xffffffff);
1554 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1556 personality_set
= 1;
1557 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1559 if (errno
!= 0 || (personality_set
1560 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1561 warning (_("Error disabling address space randomization: %s"),
1562 safe_strerror (errno
));
1564 #endif /* HAVE_PERSONALITY */
1566 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1568 #ifdef HAVE_PERSONALITY
1569 if (personality_set
)
1572 personality (personality_orig
);
1574 warning (_("Error restoring address space randomization: %s"),
1575 safe_strerror (errno
));
1577 #endif /* HAVE_PERSONALITY */
1581 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1583 struct lwp_info
*lp
;
1587 linux_ops
->to_attach (ops
, args
, from_tty
);
1589 /* The ptrace base target adds the main thread with (pid,0,0)
1590 format. Decorate it with lwp info. */
1591 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1592 thread_change_ptid (inferior_ptid
, ptid
);
1594 /* Add the initial process as the first LWP to the list. */
1595 lp
= add_lwp (ptid
);
1597 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1599 if (!WIFSTOPPED (status
))
1601 if (WIFEXITED (status
))
1603 int exit_code
= WEXITSTATUS (status
);
1605 target_terminal_ours ();
1606 target_mourn_inferior ();
1608 error (_("Unable to attach: program exited normally."));
1610 error (_("Unable to attach: program exited with code %d."),
1613 else if (WIFSIGNALED (status
))
1615 enum target_signal signo
;
1617 target_terminal_ours ();
1618 target_mourn_inferior ();
1620 signo
= target_signal_from_host (WTERMSIG (status
));
1621 error (_("Unable to attach: program terminated with signal "
1623 target_signal_to_name (signo
),
1624 target_signal_to_string (signo
));
1627 internal_error (__FILE__
, __LINE__
,
1628 _("unexpected status %d for PID %ld"),
1629 status
, (long) GET_LWP (ptid
));
1634 /* Save the wait status to report later. */
1636 if (debug_linux_nat
)
1637 fprintf_unfiltered (gdb_stdlog
,
1638 "LNA: waitpid %ld, saving status %s\n",
1639 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1641 lp
->status
= status
;
1643 if (target_can_async_p ())
1644 target_async (inferior_event_handler
, 0);
1647 /* Get pending status of LP. */
1649 get_pending_status (struct lwp_info
*lp
, int *status
)
1651 enum target_signal signo
= TARGET_SIGNAL_0
;
1653 /* If we paused threads momentarily, we may have stored pending
1654 events in lp->status or lp->waitstatus (see stop_wait_callback),
1655 and GDB core hasn't seen any signal for those threads.
1656 Otherwise, the last signal reported to the core is found in the
1657 thread object's stop_signal.
1659 There's a corner case that isn't handled here at present. Only
1660 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1661 stop_signal make sense as a real signal to pass to the inferior.
1662 Some catchpoint related events, like
1663 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1664 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1665 those traps are debug API (ptrace in our case) related and
1666 induced; the inferior wouldn't see them if it wasn't being
1667 traced. Hence, we should never pass them to the inferior, even
1668 when set to pass state. Since this corner case isn't handled by
1669 infrun.c when proceeding with a signal, for consistency, neither
1670 do we handle it here (or elsewhere in the file we check for
1671 signal pass state). Normally SIGTRAP isn't set to pass state, so
1672 this is really a corner case. */
1674 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1675 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1676 else if (lp
->status
)
1677 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1678 else if (non_stop
&& !is_executing (lp
->ptid
))
1680 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1681 signo
= tp
->stop_signal
;
1685 struct target_waitstatus last
;
1688 get_last_target_status (&last_ptid
, &last
);
1690 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1692 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1693 signo
= tp
->stop_signal
;
1699 if (signo
== TARGET_SIGNAL_0
)
1701 if (debug_linux_nat
)
1702 fprintf_unfiltered (gdb_stdlog
,
1703 "GPT: lwp %s has no pending signal\n",
1704 target_pid_to_str (lp
->ptid
));
1706 else if (!signal_pass_state (signo
))
1708 if (debug_linux_nat
)
1709 fprintf_unfiltered (gdb_stdlog
, "\
1710 GPT: lwp %s had signal %s, but it is in no pass state\n",
1711 target_pid_to_str (lp
->ptid
),
1712 target_signal_to_string (signo
));
1716 *status
= W_STOPCODE (target_signal_to_host (signo
));
1718 if (debug_linux_nat
)
1719 fprintf_unfiltered (gdb_stdlog
,
1720 "GPT: lwp %s has pending signal %s\n",
1721 target_pid_to_str (lp
->ptid
),
1722 target_signal_to_string (signo
));
1729 detach_callback (struct lwp_info
*lp
, void *data
)
1731 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1733 if (debug_linux_nat
&& lp
->status
)
1734 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1735 strsignal (WSTOPSIG (lp
->status
)),
1736 target_pid_to_str (lp
->ptid
));
1738 /* If there is a pending SIGSTOP, get rid of it. */
1741 if (debug_linux_nat
)
1742 fprintf_unfiltered (gdb_stdlog
,
1743 "DC: Sending SIGCONT to %s\n",
1744 target_pid_to_str (lp
->ptid
));
1746 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1750 /* We don't actually detach from the LWP that has an id equal to the
1751 overall process id just yet. */
1752 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1756 /* Pass on any pending signal for this LWP. */
1757 get_pending_status (lp
, &status
);
1760 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1761 WSTOPSIG (status
)) < 0)
1762 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1763 safe_strerror (errno
));
1765 if (debug_linux_nat
)
1766 fprintf_unfiltered (gdb_stdlog
,
1767 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1768 target_pid_to_str (lp
->ptid
),
1769 strsignal (WSTOPSIG (status
)));
1771 delete_lwp (lp
->ptid
);
1778 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1782 enum target_signal sig
;
1783 struct lwp_info
*main_lwp
;
1785 pid
= GET_PID (inferior_ptid
);
1787 if (target_can_async_p ())
1788 linux_nat_async (NULL
, 0);
1790 /* Stop all threads before detaching. ptrace requires that the
1791 thread is stopped to sucessfully detach. */
1792 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1793 /* ... and wait until all of them have reported back that
1794 they're no longer running. */
1795 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1797 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1799 /* Only the initial process should be left right now. */
1800 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1802 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1804 /* Pass on any pending signal for the last LWP. */
1805 if ((args
== NULL
|| *args
== '\0')
1806 && get_pending_status (main_lwp
, &status
) != -1
1807 && WIFSTOPPED (status
))
1809 /* Put the signal number in ARGS so that inf_ptrace_detach will
1810 pass it along with PTRACE_DETACH. */
1812 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1813 fprintf_unfiltered (gdb_stdlog
,
1814 "LND: Sending signal %s to %s\n",
1816 target_pid_to_str (main_lwp
->ptid
));
1819 delete_lwp (main_lwp
->ptid
);
1821 if (forks_exist_p ())
1823 /* Multi-fork case. The current inferior_ptid is being detached
1824 from, but there are other viable forks to debug. Detach from
1825 the current fork, and context-switch to the first
1827 linux_fork_detach (args
, from_tty
);
1829 if (non_stop
&& target_can_async_p ())
1830 target_async (inferior_event_handler
, 0);
1833 linux_ops
->to_detach (ops
, args
, from_tty
);
1839 resume_callback (struct lwp_info
*lp
, void *data
)
1841 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1843 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1845 if (debug_linux_nat
)
1846 fprintf_unfiltered (gdb_stdlog
,
1847 "RC: Not resuming %s (vfork parent)\n",
1848 target_pid_to_str (lp
->ptid
));
1850 else if (lp
->stopped
&& lp
->status
== 0)
1852 if (debug_linux_nat
)
1853 fprintf_unfiltered (gdb_stdlog
,
1854 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1855 target_pid_to_str (lp
->ptid
));
1857 linux_ops
->to_resume (linux_ops
,
1858 pid_to_ptid (GET_LWP (lp
->ptid
)),
1859 0, TARGET_SIGNAL_0
);
1860 if (debug_linux_nat
)
1861 fprintf_unfiltered (gdb_stdlog
,
1862 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1863 target_pid_to_str (lp
->ptid
));
1866 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1867 lp
->stopped_by_watchpoint
= 0;
1869 else if (lp
->stopped
&& debug_linux_nat
)
1870 fprintf_unfiltered (gdb_stdlog
, "RC: Not resuming sibling %s (has pending)\n",
1871 target_pid_to_str (lp
->ptid
));
1872 else if (debug_linux_nat
)
1873 fprintf_unfiltered (gdb_stdlog
, "RC: Not resuming sibling %s (not stopped)\n",
1874 target_pid_to_str (lp
->ptid
));
1880 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1887 resume_set_callback (struct lwp_info
*lp
, void *data
)
1894 linux_nat_resume (struct target_ops
*ops
,
1895 ptid_t ptid
, int step
, enum target_signal signo
)
1898 struct lwp_info
*lp
;
1901 if (debug_linux_nat
)
1902 fprintf_unfiltered (gdb_stdlog
,
1903 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1904 step
? "step" : "resume",
1905 target_pid_to_str (ptid
),
1906 signo
? strsignal (signo
) : "0",
1907 target_pid_to_str (inferior_ptid
));
1909 block_child_signals (&prev_mask
);
1911 /* A specific PTID means `step only this process id'. */
1912 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1913 || ptid_is_pid (ptid
));
1917 /* Mark the lwps we're resuming as resumed. */
1918 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
1919 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1922 iterate_over_lwps (minus_one_ptid
, resume_set_callback
, NULL
);
1924 /* See if it's the current inferior that should be handled
1927 lp
= find_lwp_pid (inferior_ptid
);
1929 lp
= find_lwp_pid (ptid
);
1930 gdb_assert (lp
!= NULL
);
1932 /* Remember if we're stepping. */
1935 /* If we have a pending wait status for this thread, there is no
1936 point in resuming the process. But first make sure that
1937 linux_nat_wait won't preemptively handle the event - we
1938 should never take this short-circuit if we are going to
1939 leave LP running, since we have skipped resuming all the
1940 other threads. This bit of code needs to be synchronized
1941 with linux_nat_wait. */
1943 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1946 struct inferior
*inf
;
1948 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
1950 saved_signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1952 /* Defer to common code if we're gaining control of the
1954 if (inf
->stop_soon
== NO_STOP_QUIETLY
1955 && signal_stop_state (saved_signo
) == 0
1956 && signal_print_state (saved_signo
) == 0
1957 && signal_pass_state (saved_signo
) == 1)
1959 if (debug_linux_nat
)
1960 fprintf_unfiltered (gdb_stdlog
,
1961 "LLR: Not short circuiting for ignored "
1962 "status 0x%x\n", lp
->status
);
1964 /* FIXME: What should we do if we are supposed to continue
1965 this thread with a signal? */
1966 gdb_assert (signo
== TARGET_SIGNAL_0
);
1967 signo
= saved_signo
;
1972 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1974 /* FIXME: What should we do if we are supposed to continue
1975 this thread with a signal? */
1976 gdb_assert (signo
== TARGET_SIGNAL_0
);
1978 if (debug_linux_nat
)
1979 fprintf_unfiltered (gdb_stdlog
,
1980 "LLR: Short circuiting for status 0x%x\n",
1983 restore_child_signals_mask (&prev_mask
);
1984 if (target_can_async_p ())
1986 target_async (inferior_event_handler
, 0);
1987 /* Tell the event loop we have something to process. */
1993 /* Mark LWP as not stopped to prevent it from being continued by
1998 iterate_over_lwps (ptid
, resume_callback
, NULL
);
2000 /* Convert to something the lower layer understands. */
2001 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
2003 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
2004 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2005 lp
->stopped_by_watchpoint
= 0;
2007 if (debug_linux_nat
)
2008 fprintf_unfiltered (gdb_stdlog
,
2009 "LLR: %s %s, %s (resume event thread)\n",
2010 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
2011 target_pid_to_str (ptid
),
2012 signo
? strsignal (signo
) : "0");
2014 restore_child_signals_mask (&prev_mask
);
2015 if (target_can_async_p ())
2016 target_async (inferior_event_handler
, 0);
2019 /* Send a signal to an LWP. */
2022 kill_lwp (int lwpid
, int signo
)
2024 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2025 fails, then we are not using nptl threads and we should be using kill. */
2027 #ifdef HAVE_TKILL_SYSCALL
2029 static int tkill_failed
;
2036 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2037 if (errno
!= ENOSYS
)
2044 return kill (lwpid
, signo
);
2047 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2048 event, check if the core is interested in it: if not, ignore the
2049 event, and keep waiting; otherwise, we need to toggle the LWP's
2050 syscall entry/exit status, since the ptrace event itself doesn't
2051 indicate it, and report the trap to higher layers. */
2054 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2056 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2057 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2058 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2062 /* If we're stopping threads, there's a SIGSTOP pending, which
2063 makes it so that the LWP reports an immediate syscall return,
2064 followed by the SIGSTOP. Skip seeing that "return" using
2065 PTRACE_CONT directly, and let stop_wait_callback collect the
2066 SIGSTOP. Later when the thread is resumed, a new syscall
2067 entry event. If we didn't do this (and returned 0), we'd
2068 leave a syscall entry pending, and our caller, by using
2069 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2070 itself. Later, when the user re-resumes this LWP, we'd see
2071 another syscall entry event and we'd mistake it for a return.
2073 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2074 (leaving immediately with LWP->signalled set, without issuing
2075 a PTRACE_CONT), it would still be problematic to leave this
2076 syscall enter pending, as later when the thread is resumed,
2077 it would then see the same syscall exit mentioned above,
2078 followed by the delayed SIGSTOP, while the syscall didn't
2079 actually get to execute. It seems it would be even more
2080 confusing to the user. */
2082 if (debug_linux_nat
)
2083 fprintf_unfiltered (gdb_stdlog
,
2084 "LHST: ignoring syscall %d "
2085 "for LWP %ld (stopping threads), "
2086 "resuming with PTRACE_CONT for SIGSTOP\n",
2088 GET_LWP (lp
->ptid
));
2090 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2091 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2095 if (catch_syscall_enabled ())
2097 /* Always update the entry/return state, even if this particular
2098 syscall isn't interesting to the core now. In async mode,
2099 the user could install a new catchpoint for this syscall
2100 between syscall enter/return, and we'll need to know to
2101 report a syscall return if that happens. */
2102 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2103 ? TARGET_WAITKIND_SYSCALL_RETURN
2104 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2106 if (catching_syscall_number (syscall_number
))
2108 /* Alright, an event to report. */
2109 ourstatus
->kind
= lp
->syscall_state
;
2110 ourstatus
->value
.syscall_number
= syscall_number
;
2112 if (debug_linux_nat
)
2113 fprintf_unfiltered (gdb_stdlog
,
2114 "LHST: stopping for %s of syscall %d"
2116 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2117 ? "entry" : "return",
2119 GET_LWP (lp
->ptid
));
2123 if (debug_linux_nat
)
2124 fprintf_unfiltered (gdb_stdlog
,
2125 "LHST: ignoring %s of syscall %d "
2127 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2128 ? "entry" : "return",
2130 GET_LWP (lp
->ptid
));
2134 /* If we had been syscall tracing, and hence used PT_SYSCALL
2135 before on this LWP, it could happen that the user removes all
2136 syscall catchpoints before we get to process this event.
2137 There are two noteworthy issues here:
2139 - When stopped at a syscall entry event, resuming with
2140 PT_STEP still resumes executing the syscall and reports a
2143 - Only PT_SYSCALL catches syscall enters. If we last
2144 single-stepped this thread, then this event can't be a
2145 syscall enter. If we last single-stepped this thread, this
2146 has to be a syscall exit.
2148 The points above mean that the next resume, be it PT_STEP or
2149 PT_CONTINUE, can not trigger a syscall trace event. */
2150 if (debug_linux_nat
)
2151 fprintf_unfiltered (gdb_stdlog
,
2152 "LHST: caught syscall event with no syscall catchpoints."
2153 " %d for LWP %ld, ignoring\n",
2155 GET_LWP (lp
->ptid
));
2156 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2159 /* The core isn't interested in this event. For efficiency, avoid
2160 stopping all threads only to have the core resume them all again.
2161 Since we're not stopping threads, if we're still syscall tracing
2162 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2163 subsequent syscall. Simply resume using the inf-ptrace layer,
2164 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2166 /* Note that gdbarch_get_syscall_number may access registers, hence
2168 registers_changed ();
2169 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2170 lp
->step
, TARGET_SIGNAL_0
);
2174 /* Handle a GNU/Linux extended wait response. If we see a clone
2175 event, we need to add the new LWP to our list (and not report the
2176 trap to higher layers). This function returns non-zero if the
2177 event should be ignored and we should wait again. If STOPPING is
2178 true, the new LWP remains stopped, otherwise it is continued. */
2181 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2184 int pid
= GET_LWP (lp
->ptid
);
2185 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2186 struct lwp_info
*new_lp
= NULL
;
2187 int event
= status
>> 16;
2189 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2190 || event
== PTRACE_EVENT_CLONE
)
2192 unsigned long new_pid
;
2195 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2197 /* If we haven't already seen the new PID stop, wait for it now. */
2198 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2200 /* The new child has a pending SIGSTOP. We can't affect it until it
2201 hits the SIGSTOP, but we're already attached. */
2202 ret
= my_waitpid (new_pid
, &status
,
2203 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2205 perror_with_name (_("waiting for new child"));
2206 else if (ret
!= new_pid
)
2207 internal_error (__FILE__
, __LINE__
,
2208 _("wait returned unexpected PID %d"), ret
);
2209 else if (!WIFSTOPPED (status
))
2210 internal_error (__FILE__
, __LINE__
,
2211 _("wait returned unexpected status 0x%x"), status
);
2214 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2216 if (event
== PTRACE_EVENT_FORK
2217 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2219 struct fork_info
*fp
;
2221 /* Handle checkpointing by linux-fork.c here as a special
2222 case. We don't want the follow-fork-mode or 'catch fork'
2223 to interfere with this. */
2225 /* This won't actually modify the breakpoint list, but will
2226 physically remove the breakpoints from the child. */
2227 detach_breakpoints (new_pid
);
2229 /* Retain child fork in ptrace (stopped) state. */
2230 fp
= find_fork_pid (new_pid
);
2232 fp
= add_fork (new_pid
);
2234 /* Report as spurious, so that infrun doesn't want to follow
2235 this fork. We're actually doing an infcall in
2237 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2238 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2240 /* Report the stop to the core. */
2244 if (event
== PTRACE_EVENT_FORK
)
2245 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2246 else if (event
== PTRACE_EVENT_VFORK
)
2247 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2250 struct cleanup
*old_chain
;
2252 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2253 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2255 new_lp
->stopped
= 1;
2257 if (WSTOPSIG (status
) != SIGSTOP
)
2259 /* This can happen if someone starts sending signals to
2260 the new thread before it gets a chance to run, which
2261 have a lower number than SIGSTOP (e.g. SIGUSR1).
2262 This is an unlikely case, and harder to handle for
2263 fork / vfork than for clone, so we do not try - but
2264 we handle it for clone events here. We'll send
2265 the other signal on to the thread below. */
2267 new_lp
->signalled
= 1;
2274 /* Add the new thread to GDB's lists as soon as possible
2277 1) the frontend doesn't have to wait for a stop to
2280 2) we tag it with the correct running state. */
2282 /* If the thread_db layer is active, let it know about
2283 this new thread, and add it to GDB's list. */
2284 if (!thread_db_attach_lwp (new_lp
->ptid
))
2286 /* We're not using thread_db. Add it to GDB's
2288 target_post_attach (GET_LWP (new_lp
->ptid
));
2289 add_thread (new_lp
->ptid
);
2294 set_running (new_lp
->ptid
, 1);
2295 set_executing (new_lp
->ptid
, 1);
2299 /* Note the need to use the low target ops to resume, to
2300 handle resuming with PT_SYSCALL if we have syscall
2306 new_lp
->stopped
= 0;
2307 new_lp
->resumed
= 1;
2310 ? target_signal_from_host (WSTOPSIG (status
))
2313 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2317 if (debug_linux_nat
)
2318 fprintf_unfiltered (gdb_stdlog
,
2319 "LHEW: Got clone event from LWP %ld, resuming\n",
2320 GET_LWP (lp
->ptid
));
2321 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2322 0, TARGET_SIGNAL_0
);
2330 if (event
== PTRACE_EVENT_EXEC
)
2332 if (debug_linux_nat
)
2333 fprintf_unfiltered (gdb_stdlog
,
2334 "LHEW: Got exec event from LWP %ld\n",
2335 GET_LWP (lp
->ptid
));
2337 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2338 ourstatus
->value
.execd_pathname
2339 = xstrdup (linux_child_pid_to_exec_file (pid
));
2344 if (event
== PTRACE_EVENT_VFORK_DONE
)
2346 if (current_inferior ()->waiting_for_vfork_done
)
2348 if (debug_linux_nat
)
2349 fprintf_unfiltered (gdb_stdlog
, "\
2350 LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n",
2351 GET_LWP (lp
->ptid
));
2353 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2357 if (debug_linux_nat
)
2358 fprintf_unfiltered (gdb_stdlog
, "\
2359 LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n",
2360 GET_LWP (lp
->ptid
));
2361 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2365 internal_error (__FILE__
, __LINE__
,
2366 _("unknown ptrace event %d"), event
);
2369 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2373 wait_lwp (struct lwp_info
*lp
)
2377 int thread_dead
= 0;
2379 gdb_assert (!lp
->stopped
);
2380 gdb_assert (lp
->status
== 0);
2382 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2383 if (pid
== -1 && errno
== ECHILD
)
2385 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2386 if (pid
== -1 && errno
== ECHILD
)
2388 /* The thread has previously exited. We need to delete it
2389 now because, for some vendor 2.4 kernels with NPTL
2390 support backported, there won't be an exit event unless
2391 it is the main thread. 2.6 kernels will report an exit
2392 event for each thread that exits, as expected. */
2394 if (debug_linux_nat
)
2395 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2396 target_pid_to_str (lp
->ptid
));
2402 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2404 if (debug_linux_nat
)
2406 fprintf_unfiltered (gdb_stdlog
,
2407 "WL: waitpid %s received %s\n",
2408 target_pid_to_str (lp
->ptid
),
2409 status_to_str (status
));
2413 /* Check if the thread has exited. */
2414 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2417 if (debug_linux_nat
)
2418 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2419 target_pid_to_str (lp
->ptid
));
2428 gdb_assert (WIFSTOPPED (status
));
2430 /* Handle GNU/Linux's syscall SIGTRAPs. */
2431 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2433 /* No longer need the sysgood bit. The ptrace event ends up
2434 recorded in lp->waitstatus if we care for it. We can carry
2435 on handling the event like a regular SIGTRAP from here
2437 status
= W_STOPCODE (SIGTRAP
);
2438 if (linux_handle_syscall_trap (lp
, 1))
2439 return wait_lwp (lp
);
2442 /* Handle GNU/Linux's extended waitstatus for trace events. */
2443 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2445 if (debug_linux_nat
)
2446 fprintf_unfiltered (gdb_stdlog
,
2447 "WL: Handling extended status 0x%06x\n",
2449 if (linux_handle_extended_wait (lp
, status
, 1))
2450 return wait_lwp (lp
);
2456 /* Save the most recent siginfo for LP. This is currently only called
2457 for SIGTRAP; some ports use the si_addr field for
2458 target_stopped_data_address. In the future, it may also be used to
2459 restore the siginfo of requeued signals. */
2462 save_siginfo (struct lwp_info
*lp
)
2465 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2466 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2469 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2472 /* Send a SIGSTOP to LP. */
2475 stop_callback (struct lwp_info
*lp
, void *data
)
2477 if (!lp
->stopped
&& !lp
->signalled
)
2481 if (debug_linux_nat
)
2483 fprintf_unfiltered (gdb_stdlog
,
2484 "SC: kill %s **<SIGSTOP>**\n",
2485 target_pid_to_str (lp
->ptid
));
2488 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2489 if (debug_linux_nat
)
2491 fprintf_unfiltered (gdb_stdlog
,
2492 "SC: lwp kill %d %s\n",
2494 errno
? safe_strerror (errno
) : "ERRNO-OK");
2498 gdb_assert (lp
->status
== 0);
2504 /* Return non-zero if LWP PID has a pending SIGINT. */
2507 linux_nat_has_pending_sigint (int pid
)
2509 sigset_t pending
, blocked
, ignored
;
2512 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2514 if (sigismember (&pending
, SIGINT
)
2515 && !sigismember (&ignored
, SIGINT
))
2521 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2524 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2526 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2527 flag to consume the next one. */
2528 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2529 && WSTOPSIG (lp
->status
) == SIGINT
)
2532 lp
->ignore_sigint
= 1;
2537 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2538 This function is called after we know the LWP has stopped; if the LWP
2539 stopped before the expected SIGINT was delivered, then it will never have
2540 arrived. Also, if the signal was delivered to a shared queue and consumed
2541 by a different thread, it will never be delivered to this LWP. */
2544 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2546 if (!lp
->ignore_sigint
)
2549 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2551 if (debug_linux_nat
)
2552 fprintf_unfiltered (gdb_stdlog
,
2553 "MCIS: Clearing bogus flag for %s\n",
2554 target_pid_to_str (lp
->ptid
));
2555 lp
->ignore_sigint
= 0;
2559 /* Fetch the possible triggered data watchpoint info and store it in
2562 On some archs, like x86, that use debug registers to set
2563 watchpoints, it's possible that the way to know which watched
2564 address trapped, is to check the register that is used to select
2565 which address to watch. Problem is, between setting the watchpoint
2566 and reading back which data address trapped, the user may change
2567 the set of watchpoints, and, as a consequence, GDB changes the
2568 debug registers in the inferior. To avoid reading back a stale
2569 stopped-data-address when that happens, we cache in LP the fact
2570 that a watchpoint trapped, and the corresponding data address, as
2571 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2572 registers meanwhile, we have the cached data we can rely on. */
2575 save_sigtrap (struct lwp_info
*lp
)
2577 struct cleanup
*old_chain
;
2579 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2581 lp
->stopped_by_watchpoint
= 0;
2585 old_chain
= save_inferior_ptid ();
2586 inferior_ptid
= lp
->ptid
;
2588 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2590 if (lp
->stopped_by_watchpoint
)
2592 if (linux_ops
->to_stopped_data_address
!= NULL
)
2593 lp
->stopped_data_address_p
=
2594 linux_ops
->to_stopped_data_address (¤t_target
,
2595 &lp
->stopped_data_address
);
2597 lp
->stopped_data_address_p
= 0;
2600 do_cleanups (old_chain
);
2603 /* See save_sigtrap. */
2606 linux_nat_stopped_by_watchpoint (void)
2608 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2610 gdb_assert (lp
!= NULL
);
2612 return lp
->stopped_by_watchpoint
;
2616 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2618 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2620 gdb_assert (lp
!= NULL
);
2622 *addr_p
= lp
->stopped_data_address
;
2624 return lp
->stopped_data_address_p
;
2627 /* Wait until LP is stopped. */
2630 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2632 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2634 /* If this is a vfork parent, bail out, it is not going to report
2635 any SIGSTOP until the vfork is done with. */
2636 if (inf
->vfork_child
!= NULL
)
2643 status
= wait_lwp (lp
);
2647 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2648 && WSTOPSIG (status
) == SIGINT
)
2650 lp
->ignore_sigint
= 0;
2653 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2654 if (debug_linux_nat
)
2655 fprintf_unfiltered (gdb_stdlog
,
2656 "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n",
2657 target_pid_to_str (lp
->ptid
),
2658 errno
? safe_strerror (errno
) : "OK");
2660 return stop_wait_callback (lp
, NULL
);
2663 maybe_clear_ignore_sigint (lp
);
2665 if (WSTOPSIG (status
) != SIGSTOP
)
2667 if (WSTOPSIG (status
) == SIGTRAP
)
2669 /* If a LWP other than the LWP that we're reporting an
2670 event for has hit a GDB breakpoint (as opposed to
2671 some random trap signal), then just arrange for it to
2672 hit it again later. We don't keep the SIGTRAP status
2673 and don't forward the SIGTRAP signal to the LWP. We
2674 will handle the current event, eventually we will
2675 resume all LWPs, and this one will get its breakpoint
2678 If we do not do this, then we run the risk that the
2679 user will delete or disable the breakpoint, but the
2680 thread will have already tripped on it. */
2682 /* Save the trap's siginfo in case we need it later. */
2687 /* Now resume this LWP and get the SIGSTOP event. */
2689 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2690 if (debug_linux_nat
)
2692 fprintf_unfiltered (gdb_stdlog
,
2693 "PTRACE_CONT %s, 0, 0 (%s)\n",
2694 target_pid_to_str (lp
->ptid
),
2695 errno
? safe_strerror (errno
) : "OK");
2697 fprintf_unfiltered (gdb_stdlog
,
2698 "SWC: Candidate SIGTRAP event in %s\n",
2699 target_pid_to_str (lp
->ptid
));
2701 /* Hold this event/waitstatus while we check to see if
2702 there are any more (we still want to get that SIGSTOP). */
2703 stop_wait_callback (lp
, NULL
);
2705 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2706 there's another event, throw it back into the
2710 if (debug_linux_nat
)
2711 fprintf_unfiltered (gdb_stdlog
,
2712 "SWC: kill %s, %s\n",
2713 target_pid_to_str (lp
->ptid
),
2714 status_to_str ((int) status
));
2715 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2718 /* Save the sigtrap event. */
2719 lp
->status
= status
;
2724 /* The thread was stopped with a signal other than
2725 SIGSTOP, and didn't accidentally trip a breakpoint. */
2727 if (debug_linux_nat
)
2729 fprintf_unfiltered (gdb_stdlog
,
2730 "SWC: Pending event %s in %s\n",
2731 status_to_str ((int) status
),
2732 target_pid_to_str (lp
->ptid
));
2734 /* Now resume this LWP and get the SIGSTOP event. */
2736 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2737 if (debug_linux_nat
)
2738 fprintf_unfiltered (gdb_stdlog
,
2739 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2740 target_pid_to_str (lp
->ptid
),
2741 errno
? safe_strerror (errno
) : "OK");
2743 /* Hold this event/waitstatus while we check to see if
2744 there are any more (we still want to get that SIGSTOP). */
2745 stop_wait_callback (lp
, NULL
);
2747 /* If the lp->status field is still empty, use it to
2748 hold this event. If not, then this event must be
2749 returned to the event queue of the LWP. */
2752 if (debug_linux_nat
)
2754 fprintf_unfiltered (gdb_stdlog
,
2755 "SWC: kill %s, %s\n",
2756 target_pid_to_str (lp
->ptid
),
2757 status_to_str ((int) status
));
2759 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2762 lp
->status
= status
;
2768 /* We caught the SIGSTOP that we intended to catch, so
2769 there's no SIGSTOP pending. */
2778 /* Return non-zero if LP has a wait status pending. */
2781 status_callback (struct lwp_info
*lp
, void *data
)
2783 /* Only report a pending wait status if we pretend that this has
2784 indeed been resumed. */
2788 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2790 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2791 or a a pending process exit. Note that `W_EXITCODE(0,0) ==
2792 0', so a clean process exit can not be stored pending in
2793 lp->status, it is indistinguishable from
2794 no-pending-status. */
2798 if (lp
->status
!= 0)
2804 /* Return non-zero if LP isn't stopped. */
2807 running_callback (struct lwp_info
*lp
, void *data
)
2809 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2812 /* Count the LWP's that have had events. */
2815 count_events_callback (struct lwp_info
*lp
, void *data
)
2819 gdb_assert (count
!= NULL
);
2821 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2822 if (lp
->status
!= 0 && lp
->resumed
2823 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
)
2829 /* Select the LWP (if any) that is currently being single-stepped. */
2832 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2834 if (lp
->step
&& lp
->status
!= 0)
2840 /* Select the Nth LWP that has had a SIGTRAP event. */
2843 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2845 int *selector
= data
;
2847 gdb_assert (selector
!= NULL
);
2849 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2850 if (lp
->status
!= 0 && lp
->resumed
2851 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
)
2852 if ((*selector
)-- == 0)
2859 cancel_breakpoint (struct lwp_info
*lp
)
2861 /* Arrange for a breakpoint to be hit again later. We don't keep
2862 the SIGTRAP status and don't forward the SIGTRAP signal to the
2863 LWP. We will handle the current event, eventually we will resume
2864 this LWP, and this breakpoint will trap again.
2866 If we do not do this, then we run the risk that the user will
2867 delete or disable the breakpoint, but the LWP will have already
2870 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2871 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2874 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2875 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2877 if (debug_linux_nat
)
2878 fprintf_unfiltered (gdb_stdlog
,
2879 "CB: Push back breakpoint for %s\n",
2880 target_pid_to_str (lp
->ptid
));
2882 /* Back up the PC if necessary. */
2883 if (gdbarch_decr_pc_after_break (gdbarch
))
2884 regcache_write_pc (regcache
, pc
);
2892 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2894 struct lwp_info
*event_lp
= data
;
2896 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2900 /* If a LWP other than the LWP that we're reporting an event for has
2901 hit a GDB breakpoint (as opposed to some random trap signal),
2902 then just arrange for it to hit it again later. We don't keep
2903 the SIGTRAP status and don't forward the SIGTRAP signal to the
2904 LWP. We will handle the current event, eventually we will resume
2905 all LWPs, and this one will get its breakpoint trap again.
2907 If we do not do this, then we run the risk that the user will
2908 delete or disable the breakpoint, but the LWP will have already
2911 if (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2913 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
2914 && cancel_breakpoint (lp
))
2915 /* Throw away the SIGTRAP. */
2921 /* Select one LWP out of those that have events pending. */
2924 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2927 int random_selector
;
2928 struct lwp_info
*event_lp
;
2930 /* Record the wait status for the original LWP. */
2931 (*orig_lp
)->status
= *status
;
2933 /* Give preference to any LWP that is being single-stepped. */
2934 event_lp
= iterate_over_lwps (filter
,
2935 select_singlestep_lwp_callback
, NULL
);
2936 if (event_lp
!= NULL
)
2938 if (debug_linux_nat
)
2939 fprintf_unfiltered (gdb_stdlog
,
2940 "SEL: Select single-step %s\n",
2941 target_pid_to_str (event_lp
->ptid
));
2945 /* No single-stepping LWP. Select one at random, out of those
2946 which have had SIGTRAP events. */
2948 /* First see how many SIGTRAP events we have. */
2949 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2951 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2952 random_selector
= (int)
2953 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2955 if (debug_linux_nat
&& num_events
> 1)
2956 fprintf_unfiltered (gdb_stdlog
,
2957 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2958 num_events
, random_selector
);
2960 event_lp
= iterate_over_lwps (filter
,
2961 select_event_lwp_callback
,
2965 if (event_lp
!= NULL
)
2967 /* Switch the event LWP. */
2968 *orig_lp
= event_lp
;
2969 *status
= event_lp
->status
;
2972 /* Flush the wait status for the event LWP. */
2973 (*orig_lp
)->status
= 0;
2976 /* Return non-zero if LP has been resumed. */
2979 resumed_callback (struct lwp_info
*lp
, void *data
)
2984 /* Stop an active thread, verify it still exists, then resume it. */
2987 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
2989 struct lwp_info
*ptr
;
2991 if (!lp
->stopped
&& !lp
->signalled
)
2993 stop_callback (lp
, NULL
);
2994 stop_wait_callback (lp
, NULL
);
2995 /* Resume if the lwp still exists. */
2996 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
2999 resume_callback (lp
, NULL
);
3000 resume_set_callback (lp
, NULL
);
3006 /* Check if we should go on and pass this event to common code.
3007 Return the affected lwp if we are, or NULL otherwise. */
3008 static struct lwp_info
*
3009 linux_nat_filter_event (int lwpid
, int status
, int options
)
3011 struct lwp_info
*lp
;
3013 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3015 /* Check for stop events reported by a process we didn't already
3016 know about - anything not already in our LWP list.
3018 If we're expecting to receive stopped processes after
3019 fork, vfork, and clone events, then we'll just add the
3020 new one to our list and go back to waiting for the event
3021 to be reported - the stopped process might be returned
3022 from waitpid before or after the event is. */
3023 if (WIFSTOPPED (status
) && !lp
)
3025 linux_record_stopped_pid (lwpid
, status
);
3029 /* Make sure we don't report an event for the exit of an LWP not in
3030 our list, i.e. not part of the current process. This can happen
3031 if we detach from a program we original forked and then it
3033 if (!WIFSTOPPED (status
) && !lp
)
3036 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3037 CLONE_PTRACE processes which do not use the thread library -
3038 otherwise we wouldn't find the new LWP this way. That doesn't
3039 currently work, and the following code is currently unreachable
3040 due to the two blocks above. If it's fixed some day, this code
3041 should be broken out into a function so that we can also pick up
3042 LWPs from the new interface. */
3045 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3046 if (options
& __WCLONE
)
3049 gdb_assert (WIFSTOPPED (status
)
3050 && WSTOPSIG (status
) == SIGSTOP
);
3053 if (!in_thread_list (inferior_ptid
))
3055 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3056 GET_PID (inferior_ptid
));
3057 add_thread (inferior_ptid
);
3060 add_thread (lp
->ptid
);
3063 /* Handle GNU/Linux's syscall SIGTRAPs. */
3064 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3066 /* No longer need the sysgood bit. The ptrace event ends up
3067 recorded in lp->waitstatus if we care for it. We can carry
3068 on handling the event like a regular SIGTRAP from here
3070 status
= W_STOPCODE (SIGTRAP
);
3071 if (linux_handle_syscall_trap (lp
, 0))
3075 /* Handle GNU/Linux's extended waitstatus for trace events. */
3076 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3078 if (debug_linux_nat
)
3079 fprintf_unfiltered (gdb_stdlog
,
3080 "LLW: Handling extended status 0x%06x\n",
3082 if (linux_handle_extended_wait (lp
, status
, 0))
3086 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
)
3088 /* Save the trap's siginfo in case we need it later. */
3094 /* Check if the thread has exited. */
3095 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3096 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3098 /* If this is the main thread, we must stop all threads and verify
3099 if they are still alive. This is because in the nptl thread model
3100 on Linux 2.4, there is no signal issued for exiting LWPs
3101 other than the main thread. We only get the main thread exit
3102 signal once all child threads have already exited. If we
3103 stop all the threads and use the stop_wait_callback to check
3104 if they have exited we can determine whether this signal
3105 should be ignored or whether it means the end of the debugged
3106 application, regardless of which threading model is being
3108 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3111 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3112 stop_and_resume_callback
, NULL
);
3115 if (debug_linux_nat
)
3116 fprintf_unfiltered (gdb_stdlog
,
3117 "LLW: %s exited.\n",
3118 target_pid_to_str (lp
->ptid
));
3120 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3122 /* If there is at least one more LWP, then the exit signal
3123 was not the end of the debugged application and should be
3130 /* Check if the current LWP has previously exited. In the nptl
3131 thread model, LWPs other than the main thread do not issue
3132 signals when they exit so we must check whenever the thread has
3133 stopped. A similar check is made in stop_wait_callback(). */
3134 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3136 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3138 if (debug_linux_nat
)
3139 fprintf_unfiltered (gdb_stdlog
,
3140 "LLW: %s exited.\n",
3141 target_pid_to_str (lp
->ptid
));
3145 /* Make sure there is at least one thread running. */
3146 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3148 /* Discard the event. */
3152 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3153 an attempt to stop an LWP. */
3155 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3157 if (debug_linux_nat
)
3158 fprintf_unfiltered (gdb_stdlog
,
3159 "LLW: Delayed SIGSTOP caught for %s.\n",
3160 target_pid_to_str (lp
->ptid
));
3162 /* This is a delayed SIGSTOP. */
3165 registers_changed ();
3167 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3168 lp
->step
, TARGET_SIGNAL_0
);
3169 if (debug_linux_nat
)
3170 fprintf_unfiltered (gdb_stdlog
,
3171 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3173 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3174 target_pid_to_str (lp
->ptid
));
3177 gdb_assert (lp
->resumed
);
3179 /* Discard the event. */
3183 /* Make sure we don't report a SIGINT that we have already displayed
3184 for another thread. */
3185 if (lp
->ignore_sigint
3186 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3188 if (debug_linux_nat
)
3189 fprintf_unfiltered (gdb_stdlog
,
3190 "LLW: Delayed SIGINT caught for %s.\n",
3191 target_pid_to_str (lp
->ptid
));
3193 /* This is a delayed SIGINT. */
3194 lp
->ignore_sigint
= 0;
3196 registers_changed ();
3197 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3198 lp
->step
, TARGET_SIGNAL_0
);
3199 if (debug_linux_nat
)
3200 fprintf_unfiltered (gdb_stdlog
,
3201 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3203 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3204 target_pid_to_str (lp
->ptid
));
3207 gdb_assert (lp
->resumed
);
3209 /* Discard the event. */
3213 /* An interesting event. */
3215 lp
->status
= status
;
3220 linux_nat_wait_1 (struct target_ops
*ops
,
3221 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3224 static sigset_t prev_mask
;
3225 struct lwp_info
*lp
= NULL
;
3230 if (debug_linux_nat_async
)
3231 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3233 /* The first time we get here after starting a new inferior, we may
3234 not have added it to the LWP list yet - this is the earliest
3235 moment at which we know its PID. */
3236 if (ptid_is_pid (inferior_ptid
))
3238 /* Upgrade the main thread's ptid. */
3239 thread_change_ptid (inferior_ptid
,
3240 BUILD_LWP (GET_PID (inferior_ptid
),
3241 GET_PID (inferior_ptid
)));
3243 lp
= add_lwp (inferior_ptid
);
3247 /* Make sure SIGCHLD is blocked. */
3248 block_child_signals (&prev_mask
);
3250 if (ptid_equal (ptid
, minus_one_ptid
))
3252 else if (ptid_is_pid (ptid
))
3253 /* A request to wait for a specific tgid. This is not possible
3254 with waitpid, so instead, we wait for any child, and leave
3255 children we're not interested in right now with a pending
3256 status to report later. */
3259 pid
= GET_LWP (ptid
);
3265 /* Make sure there is at least one LWP that has been resumed. */
3266 gdb_assert (iterate_over_lwps (ptid
, resumed_callback
, NULL
));
3268 /* First check if there is a LWP with a wait status pending. */
3271 /* Any LWP that's been resumed will do. */
3272 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3275 if (debug_linux_nat
&& lp
->status
)
3276 fprintf_unfiltered (gdb_stdlog
,
3277 "LLW: Using pending wait status %s for %s.\n",
3278 status_to_str (lp
->status
),
3279 target_pid_to_str (lp
->ptid
));
3282 /* But if we don't find one, we'll have to wait, and check both
3283 cloned and uncloned processes. We start with the cloned
3285 options
= __WCLONE
| WNOHANG
;
3287 else if (is_lwp (ptid
))
3289 if (debug_linux_nat
)
3290 fprintf_unfiltered (gdb_stdlog
,
3291 "LLW: Waiting for specific LWP %s.\n",
3292 target_pid_to_str (ptid
));
3294 /* We have a specific LWP to check. */
3295 lp
= find_lwp_pid (ptid
);
3298 if (debug_linux_nat
&& lp
->status
)
3299 fprintf_unfiltered (gdb_stdlog
,
3300 "LLW: Using pending wait status %s for %s.\n",
3301 status_to_str (lp
->status
),
3302 target_pid_to_str (lp
->ptid
));
3304 /* If we have to wait, take into account whether PID is a cloned
3305 process or not. And we have to convert it to something that
3306 the layer beneath us can understand. */
3307 options
= lp
->cloned
? __WCLONE
: 0;
3308 pid
= GET_LWP (ptid
);
3310 /* We check for lp->waitstatus in addition to lp->status,
3311 because we can have pending process exits recorded in
3312 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3313 an additional lp->status_p flag. */
3314 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3318 if (lp
&& lp
->signalled
)
3320 /* A pending SIGSTOP may interfere with the normal stream of
3321 events. In a typical case where interference is a problem,
3322 we have a SIGSTOP signal pending for LWP A while
3323 single-stepping it, encounter an event in LWP B, and take the
3324 pending SIGSTOP while trying to stop LWP A. After processing
3325 the event in LWP B, LWP A is continued, and we'll never see
3326 the SIGTRAP associated with the last time we were
3327 single-stepping LWP A. */
3329 /* Resume the thread. It should halt immediately returning the
3331 registers_changed ();
3332 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3333 lp
->step
, TARGET_SIGNAL_0
);
3334 if (debug_linux_nat
)
3335 fprintf_unfiltered (gdb_stdlog
,
3336 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3337 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3338 target_pid_to_str (lp
->ptid
));
3340 gdb_assert (lp
->resumed
);
3342 /* Catch the pending SIGSTOP. */
3343 status
= lp
->status
;
3346 stop_wait_callback (lp
, NULL
);
3348 /* If the lp->status field isn't empty, we caught another signal
3349 while flushing the SIGSTOP. Return it back to the event
3350 queue of the LWP, as we already have an event to handle. */
3353 if (debug_linux_nat
)
3354 fprintf_unfiltered (gdb_stdlog
,
3355 "LLW: kill %s, %s\n",
3356 target_pid_to_str (lp
->ptid
),
3357 status_to_str (lp
->status
));
3358 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3361 lp
->status
= status
;
3364 if (!target_can_async_p ())
3366 /* Causes SIGINT to be passed on to the attached process. */
3370 /* Translate generic target_wait options into waitpid options. */
3371 if (target_options
& TARGET_WNOHANG
)
3378 lwpid
= my_waitpid (pid
, &status
, options
);
3382 gdb_assert (pid
== -1 || lwpid
== pid
);
3384 if (debug_linux_nat
)
3386 fprintf_unfiltered (gdb_stdlog
,
3387 "LLW: waitpid %ld received %s\n",
3388 (long) lwpid
, status_to_str (status
));
3391 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3394 && ptid_is_pid (ptid
)
3395 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3397 if (debug_linux_nat
)
3398 fprintf (stderr
, "LWP %ld got an event %06x, leaving pending.\n",
3399 ptid_get_lwp (lp
->ptid
), status
);
3401 if (WIFSTOPPED (lp
->status
))
3403 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3405 stop_callback (lp
, NULL
);
3407 /* Resume in order to collect the sigstop. */
3408 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
3410 stop_wait_callback (lp
, NULL
);
3418 else if (WIFEXITED (status
) || WIFSIGNALED (status
))
3420 if (debug_linux_nat
)
3421 fprintf (stderr
, "Process %ld exited while stopping LWPs\n",
3422 ptid_get_lwp (lp
->ptid
));
3424 /* This was the last lwp in the process. Since
3425 events are serialized to GDB core, and we can't
3426 report this one right now, but GDB core and the
3427 other target layers will want to be notified
3428 about the exit code/signal, leave the status
3429 pending for the next time we're able to report
3432 /* Prevent trying to stop this thread again. We'll
3433 never try to resume it because it has a pending
3437 /* Dead LWP's aren't expected to reported a pending
3441 /* Store the pending event in the waitstatus as
3442 well, because W_EXITCODE(0,0) == 0. */
3443 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3457 /* waitpid did return something. Restart over. */
3458 options
|= __WCLONE
;
3466 /* Alternate between checking cloned and uncloned processes. */
3467 options
^= __WCLONE
;
3469 /* And every time we have checked both:
3470 In async mode, return to event loop;
3471 In sync mode, suspend waiting for a SIGCHLD signal. */
3472 if (options
& __WCLONE
)
3474 if (target_options
& TARGET_WNOHANG
)
3476 /* No interesting event. */
3477 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3479 if (debug_linux_nat_async
)
3480 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3482 restore_child_signals_mask (&prev_mask
);
3483 return minus_one_ptid
;
3486 sigsuspend (&suspend_mask
);
3489 else if (target_options
& TARGET_WNOHANG
)
3491 /* No interesting event for PID yet. */
3492 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3494 if (debug_linux_nat_async
)
3495 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3497 restore_child_signals_mask (&prev_mask
);
3498 return minus_one_ptid
;
3501 /* We shouldn't end up here unless we want to try again. */
3502 gdb_assert (lp
== NULL
);
3505 if (!target_can_async_p ())
3506 clear_sigint_trap ();
3510 status
= lp
->status
;
3513 /* Don't report signals that GDB isn't interested in, such as
3514 signals that are neither printed nor stopped upon. Stopping all
3515 threads can be a bit time-consuming so if we want decent
3516 performance with heavily multi-threaded programs, especially when
3517 they're using a high frequency timer, we'd better avoid it if we
3520 if (WIFSTOPPED (status
))
3522 int signo
= target_signal_from_host (WSTOPSIG (status
));
3523 struct inferior
*inf
;
3525 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
3528 /* Defer to common code if we get a signal while
3529 single-stepping, since that may need special care, e.g. to
3530 skip the signal handler, or, if we're gaining control of the
3533 && inf
->stop_soon
== NO_STOP_QUIETLY
3534 && signal_stop_state (signo
) == 0
3535 && signal_print_state (signo
) == 0
3536 && signal_pass_state (signo
) == 1)
3538 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3539 here? It is not clear we should. GDB may not expect
3540 other threads to run. On the other hand, not resuming
3541 newly attached threads may cause an unwanted delay in
3542 getting them running. */
3543 registers_changed ();
3544 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3546 if (debug_linux_nat
)
3547 fprintf_unfiltered (gdb_stdlog
,
3548 "LLW: %s %s, %s (preempt 'handle')\n",
3550 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3551 target_pid_to_str (lp
->ptid
),
3552 signo
? strsignal (signo
) : "0");
3559 /* Only do the below in all-stop, as we currently use SIGINT
3560 to implement target_stop (see linux_nat_stop) in
3562 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3564 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3565 forwarded to the entire process group, that is, all LWPs
3566 will receive it - unless they're using CLONE_THREAD to
3567 share signals. Since we only want to report it once, we
3568 mark it as ignored for all LWPs except this one. */
3569 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3570 set_ignore_sigint
, NULL
);
3571 lp
->ignore_sigint
= 0;
3574 maybe_clear_ignore_sigint (lp
);
3578 /* This LWP is stopped now. */
3581 if (debug_linux_nat
)
3582 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3583 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3587 /* Now stop all other LWP's ... */
3588 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3590 /* ... and wait until all of them have reported back that
3591 they're no longer running. */
3592 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3594 /* If we're not waiting for a specific LWP, choose an event LWP
3595 from among those that have had events. Giving equal priority
3596 to all LWPs that have had events helps prevent
3599 select_event_lwp (ptid
, &lp
, &status
);
3602 /* Now that we've selected our final event LWP, cancel any
3603 breakpoints in other LWPs that have hit a GDB breakpoint. See
3604 the comment in cancel_breakpoints_callback to find out why. */
3605 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3607 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
)
3609 if (debug_linux_nat
)
3610 fprintf_unfiltered (gdb_stdlog
,
3611 "LLW: trap ptid is %s.\n",
3612 target_pid_to_str (lp
->ptid
));
3615 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3617 *ourstatus
= lp
->waitstatus
;
3618 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3621 store_waitstatus (ourstatus
, status
);
3623 if (debug_linux_nat_async
)
3624 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3626 restore_child_signals_mask (&prev_mask
);
3627 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3632 linux_nat_wait (struct target_ops
*ops
,
3633 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3638 if (debug_linux_nat
)
3639 fprintf_unfiltered (gdb_stdlog
, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3641 /* Flush the async file first. */
3642 if (target_can_async_p ())
3643 async_file_flush ();
3645 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3647 /* If we requested any event, and something came out, assume there
3648 may be more. If we requested a specific lwp or process, also
3649 assume there may be more. */
3650 if (target_can_async_p ()
3651 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3652 || !ptid_equal (ptid
, minus_one_ptid
)))
3655 /* Get ready for the next event. */
3656 if (target_can_async_p ())
3657 target_async (inferior_event_handler
, 0);
3663 kill_callback (struct lwp_info
*lp
, void *data
)
3666 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3667 if (debug_linux_nat
)
3668 fprintf_unfiltered (gdb_stdlog
,
3669 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3670 target_pid_to_str (lp
->ptid
),
3671 errno
? safe_strerror (errno
) : "OK");
3677 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3681 /* We must make sure that there are no pending events (delayed
3682 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3683 program doesn't interfere with any following debugging session. */
3685 /* For cloned processes we must check both with __WCLONE and
3686 without, since the exit status of a cloned process isn't reported
3692 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3693 if (pid
!= (pid_t
) -1)
3695 if (debug_linux_nat
)
3696 fprintf_unfiltered (gdb_stdlog
,
3697 "KWC: wait %s received unknown.\n",
3698 target_pid_to_str (lp
->ptid
));
3699 /* The Linux kernel sometimes fails to kill a thread
3700 completely after PTRACE_KILL; that goes from the stop
3701 point in do_fork out to the one in
3702 get_signal_to_deliever and waits again. So kill it
3704 kill_callback (lp
, NULL
);
3707 while (pid
== GET_LWP (lp
->ptid
));
3709 gdb_assert (pid
== -1 && errno
== ECHILD
);
3714 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3715 if (pid
!= (pid_t
) -1)
3717 if (debug_linux_nat
)
3718 fprintf_unfiltered (gdb_stdlog
,
3719 "KWC: wait %s received unk.\n",
3720 target_pid_to_str (lp
->ptid
));
3721 /* See the call to kill_callback above. */
3722 kill_callback (lp
, NULL
);
3725 while (pid
== GET_LWP (lp
->ptid
));
3727 gdb_assert (pid
== -1 && errno
== ECHILD
);
3732 linux_nat_kill (struct target_ops
*ops
)
3734 struct target_waitstatus last
;
3738 /* If we're stopped while forking and we haven't followed yet,
3739 kill the other task. We need to do this first because the
3740 parent will be sleeping if this is a vfork. */
3742 get_last_target_status (&last_ptid
, &last
);
3744 if (last
.kind
== TARGET_WAITKIND_FORKED
3745 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3747 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3751 if (forks_exist_p ())
3752 linux_fork_killall ();
3755 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3756 /* Stop all threads before killing them, since ptrace requires
3757 that the thread is stopped to sucessfully PTRACE_KILL. */
3758 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3759 /* ... and wait until all of them have reported back that
3760 they're no longer running. */
3761 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3763 /* Kill all LWP's ... */
3764 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3766 /* ... and wait until we've flushed all events. */
3767 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3770 target_mourn_inferior ();
3774 linux_nat_mourn_inferior (struct target_ops
*ops
)
3776 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3778 if (! forks_exist_p ())
3779 /* Normal case, no other forks available. */
3780 linux_ops
->to_mourn_inferior (ops
);
3782 /* Multi-fork case. The current inferior_ptid has exited, but
3783 there are other viable forks to debug. Delete the exiting
3784 one and context-switch to the first available. */
3785 linux_fork_mourn_inferior ();
3788 /* Convert a native/host siginfo object, into/from the siginfo in the
3789 layout of the inferiors' architecture. */
3792 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3796 if (linux_nat_siginfo_fixup
!= NULL
)
3797 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3799 /* If there was no callback, or the callback didn't do anything,
3800 then just do a straight memcpy. */
3804 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3806 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3811 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3812 const char *annex
, gdb_byte
*readbuf
,
3813 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3816 struct siginfo siginfo
;
3817 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3819 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3820 gdb_assert (readbuf
|| writebuf
);
3822 pid
= GET_LWP (inferior_ptid
);
3824 pid
= GET_PID (inferior_ptid
);
3826 if (offset
> sizeof (siginfo
))
3830 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3834 /* When GDB is built as a 64-bit application, ptrace writes into
3835 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3836 inferior with a 64-bit GDB should look the same as debugging it
3837 with a 32-bit GDB, we need to convert it. GDB core always sees
3838 the converted layout, so any read/write will have to be done
3840 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3842 if (offset
+ len
> sizeof (siginfo
))
3843 len
= sizeof (siginfo
) - offset
;
3845 if (readbuf
!= NULL
)
3846 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3849 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3851 /* Convert back to ptrace layout before flushing it out. */
3852 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3855 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3864 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
3865 const char *annex
, gdb_byte
*readbuf
,
3866 const gdb_byte
*writebuf
,
3867 ULONGEST offset
, LONGEST len
)
3869 struct cleanup
*old_chain
;
3872 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
3873 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
3876 /* The target is connected but no live inferior is selected. Pass
3877 this request down to a lower stratum (e.g., the executable
3879 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
3882 old_chain
= save_inferior_ptid ();
3884 if (is_lwp (inferior_ptid
))
3885 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
3887 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
3890 do_cleanups (old_chain
);
3895 linux_thread_alive (ptid_t ptid
)
3899 gdb_assert (is_lwp (ptid
));
3901 /* Send signal 0 instead of anything ptrace, because ptracing a
3902 running thread errors out claiming that the thread doesn't
3904 err
= kill_lwp (GET_LWP (ptid
), 0);
3906 if (debug_linux_nat
)
3907 fprintf_unfiltered (gdb_stdlog
,
3908 "LLTA: KILL(SIG0) %s (%s)\n",
3909 target_pid_to_str (ptid
),
3910 err
? safe_strerror (err
) : "OK");
3919 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
3921 return linux_thread_alive (ptid
);
3925 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
3927 static char buf
[64];
3930 && (GET_PID (ptid
) != GET_LWP (ptid
)
3931 || num_lwps (GET_PID (ptid
)) > 1))
3933 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
3937 return normal_pid_to_str (ptid
);
3940 /* Accepts an integer PID; Returns a string representing a file that
3941 can be opened to get the symbols for the child process. */
3944 linux_child_pid_to_exec_file (int pid
)
3946 char *name1
, *name2
;
3948 name1
= xmalloc (MAXPATHLEN
);
3949 name2
= xmalloc (MAXPATHLEN
);
3950 make_cleanup (xfree
, name1
);
3951 make_cleanup (xfree
, name2
);
3952 memset (name2
, 0, MAXPATHLEN
);
3954 sprintf (name1
, "/proc/%d/exe", pid
);
3955 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
3961 /* Service function for corefiles and info proc. */
3964 read_mapping (FILE *mapfile
,
3969 char *device
, long long *inode
, char *filename
)
3971 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
3972 addr
, endaddr
, permissions
, offset
, device
, inode
);
3975 if (ret
> 0 && ret
!= EOF
)
3977 /* Eat everything up to EOL for the filename. This will prevent
3978 weird filenames (such as one with embedded whitespace) from
3979 confusing this code. It also makes this code more robust in
3980 respect to annotations the kernel may add after the filename.
3982 Note the filename is used for informational purposes
3984 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
3987 return (ret
!= 0 && ret
!= EOF
);
3990 /* Fills the "to_find_memory_regions" target vector. Lists the memory
3991 regions in the inferior for a corefile. */
3994 linux_nat_find_memory_regions (int (*func
) (CORE_ADDR
,
3996 int, int, int, void *), void *obfd
)
3998 int pid
= PIDGET (inferior_ptid
);
3999 char mapsfilename
[MAXPATHLEN
];
4001 long long addr
, endaddr
, size
, offset
, inode
;
4002 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4003 int read
, write
, exec
;
4005 struct cleanup
*cleanup
;
4007 /* Compose the filename for the /proc memory map, and open it. */
4008 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4009 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4010 error (_("Could not open %s."), mapsfilename
);
4011 cleanup
= make_cleanup_fclose (mapsfile
);
4014 fprintf_filtered (gdb_stdout
,
4015 "Reading memory regions from %s\n", mapsfilename
);
4017 /* Now iterate until end-of-file. */
4018 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4019 &offset
, &device
[0], &inode
, &filename
[0]))
4021 size
= endaddr
- addr
;
4023 /* Get the segment's permissions. */
4024 read
= (strchr (permissions
, 'r') != 0);
4025 write
= (strchr (permissions
, 'w') != 0);
4026 exec
= (strchr (permissions
, 'x') != 0);
4030 fprintf_filtered (gdb_stdout
,
4031 "Save segment, %lld bytes at %s (%c%c%c)",
4032 size
, paddress (target_gdbarch
, addr
),
4034 write
? 'w' : ' ', exec
? 'x' : ' ');
4036 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4037 fprintf_filtered (gdb_stdout
, "\n");
4040 /* Invoke the callback function to create the corefile
4042 func (addr
, size
, read
, write
, exec
, obfd
);
4044 do_cleanups (cleanup
);
4049 find_signalled_thread (struct thread_info
*info
, void *data
)
4051 if (info
->stop_signal
!= TARGET_SIGNAL_0
4052 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4058 static enum target_signal
4059 find_stop_signal (void)
4061 struct thread_info
*info
=
4062 iterate_over_threads (find_signalled_thread
, NULL
);
4065 return info
->stop_signal
;
4067 return TARGET_SIGNAL_0
;
4070 /* Records the thread's register state for the corefile note
4074 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4075 char *note_data
, int *note_size
,
4076 enum target_signal stop_signal
)
4078 gdb_gregset_t gregs
;
4079 gdb_fpregset_t fpregs
;
4080 unsigned long lwp
= ptid_get_lwp (ptid
);
4081 struct gdbarch
*gdbarch
= target_gdbarch
;
4082 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4083 const struct regset
*regset
;
4085 struct cleanup
*old_chain
;
4086 struct core_regset_section
*sect_list
;
4089 old_chain
= save_inferior_ptid ();
4090 inferior_ptid
= ptid
;
4091 target_fetch_registers (regcache
, -1);
4092 do_cleanups (old_chain
);
4094 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4095 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4098 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4099 sizeof (gregs
))) != NULL
4100 && regset
->collect_regset
!= NULL
)
4101 regset
->collect_regset (regset
, regcache
, -1,
4102 &gregs
, sizeof (gregs
));
4104 fill_gregset (regcache
, &gregs
, -1);
4106 note_data
= (char *) elfcore_write_prstatus (obfd
,
4110 stop_signal
, &gregs
);
4112 /* The loop below uses the new struct core_regset_section, which stores
4113 the supported section names and sizes for the core file. Note that
4114 note PRSTATUS needs to be treated specially. But the other notes are
4115 structurally the same, so they can benefit from the new struct. */
4116 if (core_regset_p
&& sect_list
!= NULL
)
4117 while (sect_list
->sect_name
!= NULL
)
4119 /* .reg was already handled above. */
4120 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4125 regset
= gdbarch_regset_from_core_section (gdbarch
,
4126 sect_list
->sect_name
,
4128 gdb_assert (regset
&& regset
->collect_regset
);
4129 gdb_regset
= xmalloc (sect_list
->size
);
4130 regset
->collect_regset (regset
, regcache
, -1,
4131 gdb_regset
, sect_list
->size
);
4132 note_data
= (char *) elfcore_write_register_note (obfd
,
4135 sect_list
->sect_name
,
4142 /* For architectures that does not have the struct core_regset_section
4143 implemented, we use the old method. When all the architectures have
4144 the new support, the code below should be deleted. */
4148 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4149 sizeof (fpregs
))) != NULL
4150 && regset
->collect_regset
!= NULL
)
4151 regset
->collect_regset (regset
, regcache
, -1,
4152 &fpregs
, sizeof (fpregs
));
4154 fill_fpregset (regcache
, &fpregs
, -1);
4156 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4159 &fpregs
, sizeof (fpregs
));
4165 struct linux_nat_corefile_thread_data
4171 enum target_signal stop_signal
;
4174 /* Called by gdbthread.c once per thread. Records the thread's
4175 register state for the corefile note section. */
4178 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4180 struct linux_nat_corefile_thread_data
*args
= data
;
4182 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4192 /* Enumerate spufs IDs for process PID. */
4195 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4199 struct dirent
*entry
;
4201 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4202 dir
= opendir (path
);
4207 while ((entry
= readdir (dir
)) != NULL
)
4213 fd
= atoi (entry
->d_name
);
4217 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4218 if (stat (path
, &st
) != 0)
4220 if (!S_ISDIR (st
.st_mode
))
4223 if (statfs (path
, &stfs
) != 0)
4225 if (stfs
.f_type
!= SPUFS_MAGIC
)
4228 callback (data
, fd
);
4234 /* Generate corefile notes for SPU contexts. */
4236 struct linux_spu_corefile_data
4244 linux_spu_corefile_callback (void *data
, int fd
)
4246 struct linux_spu_corefile_data
*args
= data
;
4249 static const char *spu_files
[] =
4271 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4273 char annex
[32], note_name
[32];
4277 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4278 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4282 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4283 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4284 args
->note_size
, note_name
,
4285 NT_SPU
, spu_data
, spu_len
);
4292 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4294 struct linux_spu_corefile_data args
;
4296 args
.note_data
= note_data
;
4297 args
.note_size
= note_size
;
4299 iterate_over_spus (PIDGET (inferior_ptid
),
4300 linux_spu_corefile_callback
, &args
);
4302 return args
.note_data
;
4305 /* Fills the "to_make_corefile_note" target vector. Builds the note
4306 section for a corefile, and returns it in a malloc buffer. */
4309 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4311 struct linux_nat_corefile_thread_data thread_args
;
4312 struct cleanup
*old_chain
;
4313 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4314 char fname
[16] = { '\0' };
4315 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4316 char psargs
[80] = { '\0' };
4317 char *note_data
= NULL
;
4318 ptid_t current_ptid
= inferior_ptid
;
4319 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4323 if (get_exec_file (0))
4325 strncpy (fname
, strrchr (get_exec_file (0), '/') + 1, sizeof (fname
));
4326 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4327 if (get_inferior_args ())
4330 char *psargs_end
= psargs
+ sizeof (psargs
);
4332 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4334 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4335 if (string_end
!= NULL
)
4337 *string_end
++ = ' ';
4338 strncpy (string_end
, get_inferior_args (),
4339 psargs_end
- string_end
);
4342 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4344 note_size
, fname
, psargs
);
4347 /* Dump information for threads. */
4348 thread_args
.obfd
= obfd
;
4349 thread_args
.note_data
= note_data
;
4350 thread_args
.note_size
= note_size
;
4351 thread_args
.num_notes
= 0;
4352 thread_args
.stop_signal
= find_stop_signal ();
4353 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4354 gdb_assert (thread_args
.num_notes
!= 0);
4355 note_data
= thread_args
.note_data
;
4357 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4361 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4362 "CORE", NT_AUXV
, auxv
, auxv_len
);
4366 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4368 make_cleanup (xfree
, note_data
);
4372 /* Implement the "info proc" command. */
4375 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4377 /* A long is used for pid instead of an int to avoid a loss of precision
4378 compiler warning from the output of strtoul. */
4379 long pid
= PIDGET (inferior_ptid
);
4382 char buffer
[MAXPATHLEN
];
4383 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4396 /* Break up 'args' into an argv array. */
4397 argv
= gdb_buildargv (args
);
4398 make_cleanup_freeargv (argv
);
4400 while (argv
!= NULL
&& *argv
!= NULL
)
4402 if (isdigit (argv
[0][0]))
4404 pid
= strtoul (argv
[0], NULL
, 10);
4406 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4410 else if (strcmp (argv
[0], "status") == 0)
4414 else if (strcmp (argv
[0], "stat") == 0)
4418 else if (strcmp (argv
[0], "cmd") == 0)
4422 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4426 else if (strcmp (argv
[0], "cwd") == 0)
4430 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4436 /* [...] (future options here) */
4441 error (_("No current process: you must name one."));
4443 sprintf (fname1
, "/proc/%ld", pid
);
4444 if (stat (fname1
, &dummy
) != 0)
4445 error (_("No /proc directory: '%s'"), fname1
);
4447 printf_filtered (_("process %ld\n"), pid
);
4448 if (cmdline_f
|| all
)
4450 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4451 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4453 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4454 if (fgets (buffer
, sizeof (buffer
), procfile
))
4455 printf_filtered ("cmdline = '%s'\n", buffer
);
4457 warning (_("unable to read '%s'"), fname1
);
4458 do_cleanups (cleanup
);
4461 warning (_("unable to open /proc file '%s'"), fname1
);
4465 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4466 memset (fname2
, 0, sizeof (fname2
));
4467 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4468 printf_filtered ("cwd = '%s'\n", fname2
);
4470 warning (_("unable to read link '%s'"), fname1
);
4474 sprintf (fname1
, "/proc/%ld/exe", pid
);
4475 memset (fname2
, 0, sizeof (fname2
));
4476 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4477 printf_filtered ("exe = '%s'\n", fname2
);
4479 warning (_("unable to read link '%s'"), fname1
);
4481 if (mappings_f
|| all
)
4483 sprintf (fname1
, "/proc/%ld/maps", pid
);
4484 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4486 long long addr
, endaddr
, size
, offset
, inode
;
4487 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4488 struct cleanup
*cleanup
;
4490 cleanup
= make_cleanup_fclose (procfile
);
4491 printf_filtered (_("Mapped address spaces:\n\n"));
4492 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4494 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4497 " Size", " Offset", "objfile");
4501 printf_filtered (" %18s %18s %10s %10s %7s\n",
4504 " Size", " Offset", "objfile");
4507 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4508 &offset
, &device
[0], &inode
, &filename
[0]))
4510 size
= endaddr
- addr
;
4512 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4513 calls here (and possibly above) should be abstracted
4514 out into their own functions? Andrew suggests using
4515 a generic local_address_string instead to print out
4516 the addresses; that makes sense to me, too. */
4518 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4520 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4521 (unsigned long) addr
, /* FIXME: pr_addr */
4522 (unsigned long) endaddr
,
4524 (unsigned int) offset
,
4525 filename
[0] ? filename
: "");
4529 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4530 (unsigned long) addr
, /* FIXME: pr_addr */
4531 (unsigned long) endaddr
,
4533 (unsigned int) offset
,
4534 filename
[0] ? filename
: "");
4538 do_cleanups (cleanup
);
4541 warning (_("unable to open /proc file '%s'"), fname1
);
4543 if (status_f
|| all
)
4545 sprintf (fname1
, "/proc/%ld/status", pid
);
4546 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4548 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4549 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4550 puts_filtered (buffer
);
4551 do_cleanups (cleanup
);
4554 warning (_("unable to open /proc file '%s'"), fname1
);
4558 sprintf (fname1
, "/proc/%ld/stat", pid
);
4559 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4564 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4566 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4567 printf_filtered (_("Process: %d\n"), itmp
);
4568 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4569 printf_filtered (_("Exec file: %s\n"), buffer
);
4570 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4571 printf_filtered (_("State: %c\n"), ctmp
);
4572 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4573 printf_filtered (_("Parent process: %d\n"), itmp
);
4574 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4575 printf_filtered (_("Process group: %d\n"), itmp
);
4576 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4577 printf_filtered (_("Session id: %d\n"), itmp
);
4578 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4579 printf_filtered (_("TTY: %d\n"), itmp
);
4580 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4581 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4582 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4583 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4584 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4585 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4586 (unsigned long) ltmp
);
4587 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4588 printf_filtered (_("Minor faults, children: %lu\n"),
4589 (unsigned long) ltmp
);
4590 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4591 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4592 (unsigned long) ltmp
);
4593 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4594 printf_filtered (_("Major faults, children: %lu\n"),
4595 (unsigned long) ltmp
);
4596 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4597 printf_filtered (_("utime: %ld\n"), ltmp
);
4598 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4599 printf_filtered (_("stime: %ld\n"), ltmp
);
4600 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4601 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4602 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4603 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4604 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4605 printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
4607 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4608 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4609 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4610 printf_filtered (_("jiffies until next timeout: %lu\n"),
4611 (unsigned long) ltmp
);
4612 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4613 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4614 (unsigned long) ltmp
);
4615 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4616 printf_filtered (_("start time (jiffies since system boot): %ld\n"),
4618 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4619 printf_filtered (_("Virtual memory size: %lu\n"),
4620 (unsigned long) ltmp
);
4621 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4622 printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp
);
4623 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4624 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4625 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4626 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4627 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4628 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4629 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4630 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4631 #if 0 /* Don't know how architecture-dependent the rest is...
4632 Anyway the signal bitmap info is available from "status". */
4633 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4634 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4635 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4636 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4637 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4638 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4639 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4640 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4641 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4642 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4643 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4644 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4645 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4646 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4648 do_cleanups (cleanup
);
4651 warning (_("unable to open /proc file '%s'"), fname1
);
4655 /* Implement the to_xfer_partial interface for memory reads using the /proc
4656 filesystem. Because we can use a single read() call for /proc, this
4657 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4658 but it doesn't support writes. */
4661 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4662 const char *annex
, gdb_byte
*readbuf
,
4663 const gdb_byte
*writebuf
,
4664 ULONGEST offset
, LONGEST len
)
4670 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4673 /* Don't bother for one word. */
4674 if (len
< 3 * sizeof (long))
4677 /* We could keep this file open and cache it - possibly one per
4678 thread. That requires some juggling, but is even faster. */
4679 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4680 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4684 /* If pread64 is available, use it. It's faster if the kernel
4685 supports it (only one syscall), and it's 64-bit safe even on
4686 32-bit platforms (for instance, SPARC debugging a SPARC64
4689 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4691 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4702 /* Enumerate spufs IDs for process PID. */
4704 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4706 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4708 LONGEST written
= 0;
4711 struct dirent
*entry
;
4713 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4714 dir
= opendir (path
);
4719 while ((entry
= readdir (dir
)) != NULL
)
4725 fd
= atoi (entry
->d_name
);
4729 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4730 if (stat (path
, &st
) != 0)
4732 if (!S_ISDIR (st
.st_mode
))
4735 if (statfs (path
, &stfs
) != 0)
4737 if (stfs
.f_type
!= SPUFS_MAGIC
)
4740 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4742 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4752 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4753 object type, using the /proc file system. */
4755 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4756 const char *annex
, gdb_byte
*readbuf
,
4757 const gdb_byte
*writebuf
,
4758 ULONGEST offset
, LONGEST len
)
4763 int pid
= PIDGET (inferior_ptid
);
4770 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4773 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4774 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4779 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4786 ret
= write (fd
, writebuf
, (size_t) len
);
4788 ret
= read (fd
, readbuf
, (size_t) len
);
4795 /* Parse LINE as a signal set and add its set bits to SIGS. */
4798 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4800 int len
= strlen (line
) - 1;
4804 if (line
[len
] != '\n')
4805 error (_("Could not parse signal set: %s"), line
);
4813 if (*p
>= '0' && *p
<= '9')
4815 else if (*p
>= 'a' && *p
<= 'f')
4816 digit
= *p
- 'a' + 10;
4818 error (_("Could not parse signal set: %s"), line
);
4823 sigaddset (sigs
, signum
+ 1);
4825 sigaddset (sigs
, signum
+ 2);
4827 sigaddset (sigs
, signum
+ 3);
4829 sigaddset (sigs
, signum
+ 4);
4835 /* Find process PID's pending signals from /proc/pid/status and set
4839 linux_proc_pending_signals (int pid
, sigset_t
*pending
, sigset_t
*blocked
, sigset_t
*ignored
)
4842 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
4844 struct cleanup
*cleanup
;
4846 sigemptyset (pending
);
4847 sigemptyset (blocked
);
4848 sigemptyset (ignored
);
4849 sprintf (fname
, "/proc/%d/status", pid
);
4850 procfile
= fopen (fname
, "r");
4851 if (procfile
== NULL
)
4852 error (_("Could not open %s"), fname
);
4853 cleanup
= make_cleanup_fclose (procfile
);
4855 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
4857 /* Normal queued signals are on the SigPnd line in the status
4858 file. However, 2.6 kernels also have a "shared" pending
4859 queue for delivering signals to a thread group, so check for
4862 Unfortunately some Red Hat kernels include the shared pending
4863 queue but not the ShdPnd status field. */
4865 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
4866 add_line_to_sigset (buffer
+ 8, pending
);
4867 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
4868 add_line_to_sigset (buffer
+ 8, pending
);
4869 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
4870 add_line_to_sigset (buffer
+ 8, blocked
);
4871 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
4872 add_line_to_sigset (buffer
+ 8, ignored
);
4875 do_cleanups (cleanup
);
4879 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
4880 const char *annex
, gdb_byte
*readbuf
,
4881 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
4883 /* We make the process list snapshot when the object starts to be
4885 static const char *buf
;
4886 static LONGEST len_avail
= -1;
4887 static struct obstack obstack
;
4891 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
4893 if (strcmp (annex
, "processes") != 0)
4896 gdb_assert (readbuf
&& !writebuf
);
4900 if (len_avail
!= -1 && len_avail
!= 0)
4901 obstack_free (&obstack
, NULL
);
4904 obstack_init (&obstack
);
4905 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
4907 dirp
= opendir ("/proc");
4911 while ((dp
= readdir (dirp
)) != NULL
)
4913 struct stat statbuf
;
4914 char procentry
[sizeof ("/proc/4294967295")];
4916 if (!isdigit (dp
->d_name
[0])
4917 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
4920 sprintf (procentry
, "/proc/%s", dp
->d_name
);
4921 if (stat (procentry
, &statbuf
) == 0
4922 && S_ISDIR (statbuf
.st_mode
))
4926 char cmd
[MAXPATHLEN
+ 1];
4927 struct passwd
*entry
;
4929 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
4930 entry
= getpwuid (statbuf
.st_uid
);
4932 if ((f
= fopen (pathname
, "r")) != NULL
)
4934 size_t len
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
4938 for (i
= 0; i
< len
; i
++)
4943 obstack_xml_printf (
4946 "<column name=\"pid\">%s</column>"
4947 "<column name=\"user\">%s</column>"
4948 "<column name=\"command\">%s</column>"
4951 entry
? entry
->pw_name
: "?",
4964 obstack_grow_str0 (&obstack
, "</osdata>\n");
4965 buf
= obstack_finish (&obstack
);
4966 len_avail
= strlen (buf
);
4969 if (offset
>= len_avail
)
4971 /* Done. Get rid of the obstack. */
4972 obstack_free (&obstack
, NULL
);
4978 if (len
> len_avail
- offset
)
4979 len
= len_avail
- offset
;
4980 memcpy (readbuf
, buf
+ offset
, len
);
4986 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4987 const char *annex
, gdb_byte
*readbuf
,
4988 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
4992 if (object
== TARGET_OBJECT_AUXV
)
4993 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
4996 if (object
== TARGET_OBJECT_OSDATA
)
4997 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5000 if (object
== TARGET_OBJECT_SPU
)
5001 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5004 /* GDB calculates all the addresses in possibly larget width of the address.
5005 Address width needs to be masked before its final use - either by
5006 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5008 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5010 if (object
== TARGET_OBJECT_MEMORY
)
5012 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5014 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5015 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5018 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5023 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5027 /* Create a prototype generic GNU/Linux target. The client can override
5028 it with local methods. */
5031 linux_target_install_ops (struct target_ops
*t
)
5033 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5034 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5035 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5036 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5037 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5038 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5039 t
->to_post_attach
= linux_child_post_attach
;
5040 t
->to_follow_fork
= linux_child_follow_fork
;
5041 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5042 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5044 super_xfer_partial
= t
->to_xfer_partial
;
5045 t
->to_xfer_partial
= linux_xfer_partial
;
5051 struct target_ops
*t
;
5053 t
= inf_ptrace_target ();
5054 linux_target_install_ops (t
);
5060 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5062 struct target_ops
*t
;
5064 t
= inf_ptrace_trad_target (register_u_offset
);
5065 linux_target_install_ops (t
);
5070 /* target_is_async_p implementation. */
5073 linux_nat_is_async_p (void)
5075 /* NOTE: palves 2008-03-21: We're only async when the user requests
5076 it explicitly with the "set target-async" command.
5077 Someday, linux will always be async. */
5078 if (!target_async_permitted
)
5081 /* See target.h/target_async_mask. */
5082 return linux_nat_async_mask_value
;
5085 /* target_can_async_p implementation. */
5088 linux_nat_can_async_p (void)
5090 /* NOTE: palves 2008-03-21: We're only async when the user requests
5091 it explicitly with the "set target-async" command.
5092 Someday, linux will always be async. */
5093 if (!target_async_permitted
)
5096 /* See target.h/target_async_mask. */
5097 return linux_nat_async_mask_value
;
5101 linux_nat_supports_non_stop (void)
5106 /* True if we want to support multi-process. To be removed when GDB
5107 supports multi-exec. */
5109 int linux_multi_process
= 1;
5112 linux_nat_supports_multi_process (void)
5114 return linux_multi_process
;
5117 /* target_async_mask implementation. */
5120 linux_nat_async_mask (int new_mask
)
5122 int curr_mask
= linux_nat_async_mask_value
;
5124 if (curr_mask
!= new_mask
)
5128 linux_nat_async (NULL
, 0);
5129 linux_nat_async_mask_value
= new_mask
;
5133 linux_nat_async_mask_value
= new_mask
;
5135 /* If we're going out of async-mask in all-stop, then the
5136 inferior is stopped. The next resume will call
5137 target_async. In non-stop, the target event source
5138 should be always registered in the event loop. Do so
5141 linux_nat_async (inferior_event_handler
, 0);
5148 static int async_terminal_is_ours
= 1;
5150 /* target_terminal_inferior implementation. */
5153 linux_nat_terminal_inferior (void)
5155 if (!target_is_async_p ())
5157 /* Async mode is disabled. */
5158 terminal_inferior ();
5162 terminal_inferior ();
5164 /* Calls to target_terminal_*() are meant to be idempotent. */
5165 if (!async_terminal_is_ours
)
5168 delete_file_handler (input_fd
);
5169 async_terminal_is_ours
= 0;
5173 /* target_terminal_ours implementation. */
5176 linux_nat_terminal_ours (void)
5178 if (!target_is_async_p ())
5180 /* Async mode is disabled. */
5185 /* GDB should never give the terminal to the inferior if the
5186 inferior is running in the background (run&, continue&, etc.),
5187 but claiming it sure should. */
5190 if (async_terminal_is_ours
)
5193 clear_sigint_trap ();
5194 add_file_handler (input_fd
, stdin_event_handler
, 0);
5195 async_terminal_is_ours
= 1;
5198 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5200 static void *async_client_context
;
5202 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5203 so we notice when any child changes state, and notify the
5204 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5205 above to wait for the arrival of a SIGCHLD. */
5208 sigchld_handler (int signo
)
5210 int old_errno
= errno
;
5212 if (debug_linux_nat_async
)
5213 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5215 if (signo
== SIGCHLD
5216 && linux_nat_event_pipe
[0] != -1)
5217 async_file_mark (); /* Let the event loop know that there are
5218 events to handle. */
5223 /* Callback registered with the target events file descriptor. */
5226 handle_target_event (int error
, gdb_client_data client_data
)
5228 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5231 /* Create/destroy the target events pipe. Returns previous state. */
5234 linux_async_pipe (int enable
)
5236 int previous
= (linux_nat_event_pipe
[0] != -1);
5238 if (previous
!= enable
)
5242 block_child_signals (&prev_mask
);
5246 if (pipe (linux_nat_event_pipe
) == -1)
5247 internal_error (__FILE__
, __LINE__
,
5248 "creating event pipe failed.");
5250 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5251 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5255 close (linux_nat_event_pipe
[0]);
5256 close (linux_nat_event_pipe
[1]);
5257 linux_nat_event_pipe
[0] = -1;
5258 linux_nat_event_pipe
[1] = -1;
5261 restore_child_signals_mask (&prev_mask
);
5267 /* target_async implementation. */
5270 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5271 void *context
), void *context
)
5273 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5274 internal_error (__FILE__
, __LINE__
,
5275 "Calling target_async when async is masked");
5277 if (callback
!= NULL
)
5279 async_client_callback
= callback
;
5280 async_client_context
= context
;
5281 if (!linux_async_pipe (1))
5283 add_file_handler (linux_nat_event_pipe
[0],
5284 handle_target_event
, NULL
);
5285 /* There may be pending events to handle. Tell the event loop
5292 async_client_callback
= callback
;
5293 async_client_context
= context
;
5294 delete_file_handler (linux_nat_event_pipe
[0]);
5295 linux_async_pipe (0);
5300 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5304 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5309 ptid_t ptid
= lwp
->ptid
;
5311 if (debug_linux_nat
)
5312 fprintf_unfiltered (gdb_stdlog
,
5313 "LNSL: running -> suspending %s\n",
5314 target_pid_to_str (lwp
->ptid
));
5317 stop_callback (lwp
, NULL
);
5318 stop_wait_callback (lwp
, NULL
);
5320 /* If the lwp exits while we try to stop it, there's nothing
5322 lwp
= find_lwp_pid (ptid
);
5326 /* If we didn't collect any signal other than SIGSTOP while
5327 stopping the LWP, push a SIGNAL_0 event. In either case, the
5328 event-loop will end up calling target_wait which will collect
5330 if (lwp
->status
== 0)
5331 lwp
->status
= W_STOPCODE (0);
5336 /* Already known to be stopped; do nothing. */
5338 if (debug_linux_nat
)
5340 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5341 fprintf_unfiltered (gdb_stdlog
, "\
5342 LNSL: already stopped/stop_requested %s\n",
5343 target_pid_to_str (lwp
->ptid
));
5345 fprintf_unfiltered (gdb_stdlog
, "\
5346 LNSL: already stopped/no stop_requested yet %s\n",
5347 target_pid_to_str (lwp
->ptid
));
5354 linux_nat_stop (ptid_t ptid
)
5357 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5359 linux_ops
->to_stop (ptid
);
5363 linux_nat_close (int quitting
)
5365 /* Unregister from the event loop. */
5366 if (target_is_async_p ())
5367 target_async (NULL
, 0);
5369 /* Reset the async_masking. */
5370 linux_nat_async_mask_value
= 1;
5372 if (linux_ops
->to_close
)
5373 linux_ops
->to_close (quitting
);
5376 /* When requests are passed down from the linux-nat layer to the
5377 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5378 used. The address space pointer is stored in the inferior object,
5379 but the common code that is passed such ptid can't tell whether
5380 lwpid is a "main" process id or not (it assumes so). We reverse
5381 look up the "main" process id from the lwp here. */
5383 struct address_space
*
5384 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5386 struct lwp_info
*lwp
;
5387 struct inferior
*inf
;
5390 pid
= GET_LWP (ptid
);
5391 if (GET_LWP (ptid
) == 0)
5393 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5395 lwp
= find_lwp_pid (ptid
);
5396 pid
= GET_PID (lwp
->ptid
);
5400 /* A (pid,lwpid,0) ptid. */
5401 pid
= GET_PID (ptid
);
5404 inf
= find_inferior_pid (pid
);
5405 gdb_assert (inf
!= NULL
);
5410 linux_nat_core_of_thread_1 (ptid_t ptid
)
5412 struct cleanup
*back_to
;
5415 char *content
= NULL
;
5418 int content_read
= 0;
5422 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5423 GET_PID (ptid
), GET_LWP (ptid
));
5424 back_to
= make_cleanup (xfree
, filename
);
5426 f
= fopen (filename
, "r");
5429 do_cleanups (back_to
);
5433 make_cleanup_fclose (f
);
5438 content
= xrealloc (content
, content_read
+ 1024);
5439 n
= fread (content
+ content_read
, 1, 1024, f
);
5443 content
[content_read
] = '\0';
5448 make_cleanup (xfree
, content
);
5450 p
= strchr (content
, '(');
5451 p
= strchr (p
, ')') + 2; /* skip ")" and a whitespace. */
5453 /* If the first field after program name has index 0, then core number is
5454 the field with index 36. There's no constant for that anywhere. */
5455 p
= strtok_r (p
, " ", &ts
);
5456 for (i
= 0; i
!= 36; ++i
)
5457 p
= strtok_r (NULL
, " ", &ts
);
5459 if (sscanf (p
, "%d", &core
) == 0)
5462 do_cleanups (back_to
);
5467 /* Return the cached value of the processor core for thread PTID. */
5470 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5472 struct lwp_info
*info
= find_lwp_pid (ptid
);
5479 linux_nat_add_target (struct target_ops
*t
)
5481 /* Save the provided single-threaded target. We save this in a separate
5482 variable because another target we've inherited from (e.g. inf-ptrace)
5483 may have saved a pointer to T; we want to use it for the final
5484 process stratum target. */
5485 linux_ops_saved
= *t
;
5486 linux_ops
= &linux_ops_saved
;
5488 /* Override some methods for multithreading. */
5489 t
->to_create_inferior
= linux_nat_create_inferior
;
5490 t
->to_attach
= linux_nat_attach
;
5491 t
->to_detach
= linux_nat_detach
;
5492 t
->to_resume
= linux_nat_resume
;
5493 t
->to_wait
= linux_nat_wait
;
5494 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5495 t
->to_kill
= linux_nat_kill
;
5496 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5497 t
->to_thread_alive
= linux_nat_thread_alive
;
5498 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5499 t
->to_has_thread_control
= tc_schedlock
;
5500 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5501 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5502 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5504 t
->to_can_async_p
= linux_nat_can_async_p
;
5505 t
->to_is_async_p
= linux_nat_is_async_p
;
5506 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5507 t
->to_async
= linux_nat_async
;
5508 t
->to_async_mask
= linux_nat_async_mask
;
5509 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5510 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5511 t
->to_close
= linux_nat_close
;
5513 /* Methods for non-stop support. */
5514 t
->to_stop
= linux_nat_stop
;
5516 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5518 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5520 /* We don't change the stratum; this target will sit at
5521 process_stratum and thread_db will set at thread_stratum. This
5522 is a little strange, since this is a multi-threaded-capable
5523 target, but we want to be on the stack below thread_db, and we
5524 also want to be used for single-threaded processes. */
5529 /* Register a method to call whenever a new thread is attached. */
5531 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5533 /* Save the pointer. We only support a single registered instance
5534 of the GNU/Linux native target, so we do not need to map this to
5536 linux_nat_new_thread
= new_thread
;
5539 /* Register a method that converts a siginfo object between the layout
5540 that ptrace returns, and the layout in the architecture of the
5543 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5544 int (*siginfo_fixup
) (struct siginfo
*,
5548 /* Save the pointer. */
5549 linux_nat_siginfo_fixup
= siginfo_fixup
;
5552 /* Return the saved siginfo associated with PTID. */
5554 linux_nat_get_siginfo (ptid_t ptid
)
5556 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5558 gdb_assert (lp
!= NULL
);
5560 return &lp
->siginfo
;
5563 /* Provide a prototype to silence -Wmissing-prototypes. */
5564 extern initialize_file_ftype _initialize_linux_nat
;
5567 _initialize_linux_nat (void)
5571 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5572 Show /proc process information about any running process.\n\
5573 Specify any process id, or use the program being debugged by default.\n\
5574 Specify any of the following keywords for detailed info:\n\
5575 mappings -- list of mapped memory regions.\n\
5576 stat -- list a bunch of random process info.\n\
5577 status -- list a different bunch of random process info.\n\
5578 all -- list all available /proc info."));
5580 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5581 &debug_linux_nat
, _("\
5582 Set debugging of GNU/Linux lwp module."), _("\
5583 Show debugging of GNU/Linux lwp module."), _("\
5584 Enables printf debugging output."),
5586 show_debug_linux_nat
,
5587 &setdebuglist
, &showdebuglist
);
5589 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5590 &debug_linux_nat_async
, _("\
5591 Set debugging of GNU/Linux async lwp module."), _("\
5592 Show debugging of GNU/Linux async lwp module."), _("\
5593 Enables printf debugging output."),
5595 show_debug_linux_nat_async
,
5596 &setdebuglist
, &showdebuglist
);
5598 /* Save this mask as the default. */
5599 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5601 /* Install a SIGCHLD handler. */
5602 sigchld_action
.sa_handler
= sigchld_handler
;
5603 sigemptyset (&sigchld_action
.sa_mask
);
5604 sigchld_action
.sa_flags
= SA_RESTART
;
5606 /* Make it the default. */
5607 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5609 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5610 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5611 sigdelset (&suspend_mask
, SIGCHLD
);
5613 sigemptyset (&blocked_mask
);
5615 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5616 &disable_randomization
, _("\
5617 Set disabling of debuggee's virtual address space randomization."), _("\
5618 Show disabling of debuggee's virtual address space randomization."), _("\
5619 When this mode is on (which is the default), randomization of the virtual\n\
5620 address space is disabled. Standalone programs run with the randomization\n\
5621 enabled by default on some platforms."),
5622 &set_disable_randomization
,
5623 &show_disable_randomization
,
5624 &setlist
, &showlist
);
5628 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5629 the GNU/Linux Threads library and therefore doesn't really belong
5632 /* Read variable NAME in the target and return its value if found.
5633 Otherwise return zero. It is assumed that the type of the variable
5637 get_signo (const char *name
)
5639 struct minimal_symbol
*ms
;
5642 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5646 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5647 sizeof (signo
)) != 0)
5653 /* Return the set of signals used by the threads library in *SET. */
5656 lin_thread_get_thread_signals (sigset_t
*set
)
5658 struct sigaction action
;
5659 int restart
, cancel
;
5661 sigemptyset (&blocked_mask
);
5664 restart
= get_signo ("__pthread_sig_restart");
5665 cancel
= get_signo ("__pthread_sig_cancel");
5667 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5668 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5669 not provide any way for the debugger to query the signal numbers -
5670 fortunately they don't change! */
5673 restart
= __SIGRTMIN
;
5676 cancel
= __SIGRTMIN
+ 1;
5678 sigaddset (set
, restart
);
5679 sigaddset (set
, cancel
);
5681 /* The GNU/Linux Threads library makes terminating threads send a
5682 special "cancel" signal instead of SIGCHLD. Make sure we catch
5683 those (to prevent them from terminating GDB itself, which is
5684 likely to be their default action) and treat them the same way as
5687 action
.sa_handler
= sigchld_handler
;
5688 sigemptyset (&action
.sa_mask
);
5689 action
.sa_flags
= SA_RESTART
;
5690 sigaction (cancel
, &action
, NULL
);
5692 /* We block the "cancel" signal throughout this code ... */
5693 sigaddset (&blocked_mask
, cancel
);
5694 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5696 /* ... except during a sigsuspend. */
5697 sigdelset (&suspend_mask
, cancel
);