1 /* GNU/Linux native-dependent code common to multiple platforms.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 2011 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-ptrace.h"
34 #include "linux-procfs.h"
35 #include "linux-fork.h"
36 #include "gdbthread.h"
40 #include "inf-ptrace.h"
42 #include <sys/param.h> /* for MAXPATHLEN */
43 #include <sys/procfs.h> /* for elf_gregset etc. */
44 #include "elf-bfd.h" /* for elfcore_write_* */
45 #include "gregset.h" /* for gregset */
46 #include "gdbcore.h" /* for get_exec_file */
47 #include <ctype.h> /* for isdigit */
48 #include "gdbthread.h" /* for struct thread_info etc. */
49 #include "gdb_stat.h" /* for struct stat */
50 #include <fcntl.h> /* for O_RDONLY */
52 #include "event-loop.h"
53 #include "event-top.h"
55 #include <sys/types.h>
56 #include "gdb_dirent.h"
57 #include "xml-support.h"
61 #include "linux-osdata.h"
64 #define SPUFS_MAGIC 0x23c9b64e
67 #ifdef HAVE_PERSONALITY
68 # include <sys/personality.h>
69 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
70 # define ADDR_NO_RANDOMIZE 0x0040000
72 #endif /* HAVE_PERSONALITY */
74 /* This comment documents high-level logic of this file.
76 Waiting for events in sync mode
77 ===============================
79 When waiting for an event in a specific thread, we just use waitpid, passing
80 the specific pid, and not passing WNOHANG.
82 When waiting for an event in all threads, waitpid is not quite good. Prior to
83 version 2.4, Linux can either wait for event in main thread, or in secondary
84 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
85 miss an event. The solution is to use non-blocking waitpid, together with
86 sigsuspend. First, we use non-blocking waitpid to get an event in the main
87 process, if any. Second, we use non-blocking waitpid with the __WCLONED
88 flag to check for events in cloned processes. If nothing is found, we use
89 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
90 happened to a child process -- and SIGCHLD will be delivered both for events
91 in main debugged process and in cloned processes. As soon as we know there's
92 an event, we get back to calling nonblocking waitpid with and without
95 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
96 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
97 blocked, the signal becomes pending and sigsuspend immediately
98 notices it and returns.
100 Waiting for events in async mode
101 ================================
103 In async mode, GDB should always be ready to handle both user input
104 and target events, so neither blocking waitpid nor sigsuspend are
105 viable options. Instead, we should asynchronously notify the GDB main
106 event loop whenever there's an unprocessed event from the target. We
107 detect asynchronous target events by handling SIGCHLD signals. To
108 notify the event loop about target events, the self-pipe trick is used
109 --- a pipe is registered as waitable event source in the event loop,
110 the event loop select/poll's on the read end of this pipe (as well on
111 other event sources, e.g., stdin), and the SIGCHLD handler writes a
112 byte to this pipe. This is more portable than relying on
113 pselect/ppoll, since on kernels that lack those syscalls, libc
114 emulates them with select/poll+sigprocmask, and that is racy
115 (a.k.a. plain broken).
117 Obviously, if we fail to notify the event loop if there's a target
118 event, it's bad. OTOH, if we notify the event loop when there's no
119 event from the target, linux_nat_wait will detect that there's no real
120 event to report, and return event of type TARGET_WAITKIND_IGNORE.
121 This is mostly harmless, but it will waste time and is better avoided.
123 The main design point is that every time GDB is outside linux-nat.c,
124 we have a SIGCHLD handler installed that is called when something
125 happens to the target and notifies the GDB event loop. Whenever GDB
126 core decides to handle the event, and calls into linux-nat.c, we
127 process things as in sync mode, except that the we never block in
130 While processing an event, we may end up momentarily blocked in
131 waitpid calls. Those waitpid calls, while blocking, are guarantied to
132 return quickly. E.g., in all-stop mode, before reporting to the core
133 that an LWP hit a breakpoint, all LWPs are stopped by sending them
134 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
135 Note that this is different from blocking indefinitely waiting for the
136 next event --- here, we're already handling an event.
141 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
142 signal is not entirely significant; we just need for a signal to be delivered,
143 so that we can intercept it. SIGSTOP's advantage is that it can not be
144 blocked. A disadvantage is that it is not a real-time signal, so it can only
145 be queued once; we do not keep track of other sources of SIGSTOP.
147 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
148 use them, because they have special behavior when the signal is generated -
149 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
150 kills the entire thread group.
152 A delivered SIGSTOP would stop the entire thread group, not just the thread we
153 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
154 cancel it (by PTRACE_CONT without passing SIGSTOP).
156 We could use a real-time signal instead. This would solve those problems; we
157 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
158 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
159 generates it, and there are races with trying to find a signal that is not
163 #define O_LARGEFILE 0
166 /* Unlike other extended result codes, WSTOPSIG (status) on
167 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
168 instead SIGTRAP with bit 7 set. */
169 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
171 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
172 the use of the multi-threaded target. */
173 static struct target_ops
*linux_ops
;
174 static struct target_ops linux_ops_saved
;
176 /* The method to call, if any, when a new thread is attached. */
177 static void (*linux_nat_new_thread
) (ptid_t
);
179 /* The method to call, if any, when the siginfo object needs to be
180 converted between the layout returned by ptrace, and the layout in
181 the architecture of the inferior. */
182 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
186 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
187 Called by our to_xfer_partial. */
188 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
190 const char *, gdb_byte
*,
194 static int debug_linux_nat
;
196 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
197 struct cmd_list_element
*c
, const char *value
)
199 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
203 struct simple_pid_list
207 struct simple_pid_list
*next
;
209 struct simple_pid_list
*stopped_pids
;
211 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
212 can not be used, 1 if it can. */
214 static int linux_supports_tracefork_flag
= -1;
216 /* This variable is a tri-state flag: -1 for unknown, 0 if
217 PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */
219 static int linux_supports_tracesysgood_flag
= -1;
221 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
222 PTRACE_O_TRACEVFORKDONE. */
224 static int linux_supports_tracevforkdone_flag
= -1;
226 /* Stores the current used ptrace() options. */
227 static int current_ptrace_options
= 0;
229 /* Async mode support. */
231 /* The read/write ends of the pipe registered as waitable file in the
233 static int linux_nat_event_pipe
[2] = { -1, -1 };
235 /* Flush the event pipe. */
238 async_file_flush (void)
245 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
247 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
250 /* Put something (anything, doesn't matter what, or how much) in event
251 pipe, so that the select/poll in the event-loop realizes we have
252 something to process. */
255 async_file_mark (void)
259 /* It doesn't really matter what the pipe contains, as long we end
260 up with something in it. Might as well flush the previous
266 ret
= write (linux_nat_event_pipe
[1], "+", 1);
268 while (ret
== -1 && errno
== EINTR
);
270 /* Ignore EAGAIN. If the pipe is full, the event loop will already
271 be awakened anyway. */
274 static void linux_nat_async (void (*callback
)
275 (enum inferior_event_type event_type
,
278 static int kill_lwp (int lwpid
, int signo
);
280 static int stop_callback (struct lwp_info
*lp
, void *data
);
282 static void block_child_signals (sigset_t
*prev_mask
);
283 static void restore_child_signals_mask (sigset_t
*prev_mask
);
286 static struct lwp_info
*add_lwp (ptid_t ptid
);
287 static void purge_lwp_list (int pid
);
288 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
291 /* Trivial list manipulation functions to keep track of a list of
292 new stopped processes. */
294 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
296 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
299 new_pid
->status
= status
;
300 new_pid
->next
= *listp
;
305 in_pid_list_p (struct simple_pid_list
*list
, int pid
)
307 struct simple_pid_list
*p
;
309 for (p
= list
; p
!= NULL
; p
= p
->next
)
316 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
318 struct simple_pid_list
**p
;
320 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
321 if ((*p
)->pid
== pid
)
323 struct simple_pid_list
*next
= (*p
)->next
;
325 *statusp
= (*p
)->status
;
334 /* A helper function for linux_test_for_tracefork, called after fork (). */
337 linux_tracefork_child (void)
339 ptrace (PTRACE_TRACEME
, 0, 0, 0);
340 kill (getpid (), SIGSTOP
);
345 /* Wrapper function for waitpid which handles EINTR. */
348 my_waitpid (int pid
, int *statusp
, int flags
)
354 ret
= waitpid (pid
, statusp
, flags
);
356 while (ret
== -1 && errno
== EINTR
);
361 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
363 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
364 we know that the feature is not available. This may change the tracing
365 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
367 However, if it succeeds, we don't know for sure that the feature is
368 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
369 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
370 fork tracing, and let it fork. If the process exits, we assume that we
371 can't use TRACEFORK; if we get the fork notification, and we can extract
372 the new child's PID, then we assume that we can. */
375 linux_test_for_tracefork (int original_pid
)
377 int child_pid
, ret
, status
;
381 /* We don't want those ptrace calls to be interrupted. */
382 block_child_signals (&prev_mask
);
384 linux_supports_tracefork_flag
= 0;
385 linux_supports_tracevforkdone_flag
= 0;
387 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
390 restore_child_signals_mask (&prev_mask
);
396 perror_with_name (("fork"));
399 linux_tracefork_child ();
401 ret
= my_waitpid (child_pid
, &status
, 0);
403 perror_with_name (("waitpid"));
404 else if (ret
!= child_pid
)
405 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
406 if (! WIFSTOPPED (status
))
407 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."),
410 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
413 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
416 warning (_("linux_test_for_tracefork: failed to kill child"));
417 restore_child_signals_mask (&prev_mask
);
421 ret
= my_waitpid (child_pid
, &status
, 0);
422 if (ret
!= child_pid
)
423 warning (_("linux_test_for_tracefork: failed "
424 "to wait for killed child"));
425 else if (!WIFSIGNALED (status
))
426 warning (_("linux_test_for_tracefork: unexpected "
427 "wait status 0x%x from killed child"), status
);
429 restore_child_signals_mask (&prev_mask
);
433 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
434 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
435 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
436 linux_supports_tracevforkdone_flag
= (ret
== 0);
438 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
440 warning (_("linux_test_for_tracefork: failed to resume child"));
442 ret
= my_waitpid (child_pid
, &status
, 0);
444 if (ret
== child_pid
&& WIFSTOPPED (status
)
445 && status
>> 16 == PTRACE_EVENT_FORK
)
448 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
449 if (ret
== 0 && second_pid
!= 0)
453 linux_supports_tracefork_flag
= 1;
454 my_waitpid (second_pid
, &second_status
, 0);
455 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
457 warning (_("linux_test_for_tracefork: "
458 "failed to kill second child"));
459 my_waitpid (second_pid
, &status
, 0);
463 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
464 "(%d, status 0x%x)"), ret
, status
);
466 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
468 warning (_("linux_test_for_tracefork: failed to kill child"));
469 my_waitpid (child_pid
, &status
, 0);
471 restore_child_signals_mask (&prev_mask
);
474 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
476 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
477 we know that the feature is not available. This may change the tracing
478 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
481 linux_test_for_tracesysgood (int original_pid
)
486 /* We don't want those ptrace calls to be interrupted. */
487 block_child_signals (&prev_mask
);
489 linux_supports_tracesysgood_flag
= 0;
491 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
495 linux_supports_tracesysgood_flag
= 1;
497 restore_child_signals_mask (&prev_mask
);
500 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
501 This function also sets linux_supports_tracesysgood_flag. */
504 linux_supports_tracesysgood (int pid
)
506 if (linux_supports_tracesysgood_flag
== -1)
507 linux_test_for_tracesysgood (pid
);
508 return linux_supports_tracesysgood_flag
;
511 /* Return non-zero iff we have tracefork functionality available.
512 This function also sets linux_supports_tracefork_flag. */
515 linux_supports_tracefork (int pid
)
517 if (linux_supports_tracefork_flag
== -1)
518 linux_test_for_tracefork (pid
);
519 return linux_supports_tracefork_flag
;
523 linux_supports_tracevforkdone (int pid
)
525 if (linux_supports_tracefork_flag
== -1)
526 linux_test_for_tracefork (pid
);
527 return linux_supports_tracevforkdone_flag
;
531 linux_enable_tracesysgood (ptid_t ptid
)
533 int pid
= ptid_get_lwp (ptid
);
536 pid
= ptid_get_pid (ptid
);
538 if (linux_supports_tracesysgood (pid
) == 0)
541 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
543 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
548 linux_enable_event_reporting (ptid_t ptid
)
550 int pid
= ptid_get_lwp (ptid
);
553 pid
= ptid_get_pid (ptid
);
555 if (! linux_supports_tracefork (pid
))
558 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
559 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
561 if (linux_supports_tracevforkdone (pid
))
562 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
564 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
565 read-only process state. */
567 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
571 linux_child_post_attach (int pid
)
573 linux_enable_event_reporting (pid_to_ptid (pid
));
574 check_for_thread_db ();
575 linux_enable_tracesysgood (pid_to_ptid (pid
));
579 linux_child_post_startup_inferior (ptid_t ptid
)
581 linux_enable_event_reporting (ptid
);
582 check_for_thread_db ();
583 linux_enable_tracesysgood (ptid
);
587 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
591 int parent_pid
, child_pid
;
593 block_child_signals (&prev_mask
);
595 has_vforked
= (inferior_thread ()->pending_follow
.kind
596 == TARGET_WAITKIND_VFORKED
);
597 parent_pid
= ptid_get_lwp (inferior_ptid
);
599 parent_pid
= ptid_get_pid (inferior_ptid
);
600 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
603 linux_enable_event_reporting (pid_to_ptid (child_pid
));
606 && !non_stop
/* Non-stop always resumes both branches. */
607 && (!target_is_async_p () || sync_execution
)
608 && !(follow_child
|| detach_fork
|| sched_multi
))
610 /* The parent stays blocked inside the vfork syscall until the
611 child execs or exits. If we don't let the child run, then
612 the parent stays blocked. If we're telling the parent to run
613 in the foreground, the user will not be able to ctrl-c to get
614 back the terminal, effectively hanging the debug session. */
615 fprintf_filtered (gdb_stderr
, _("\
616 Can not resume the parent process over vfork in the foreground while\n\
617 holding the child stopped. Try \"set detach-on-fork\" or \
618 \"set schedule-multiple\".\n"));
619 /* FIXME output string > 80 columns. */
625 struct lwp_info
*child_lp
= NULL
;
627 /* We're already attached to the parent, by default. */
629 /* Detach new forked process? */
632 /* Before detaching from the child, remove all breakpoints
633 from it. If we forked, then this has already been taken
634 care of by infrun.c. If we vforked however, any
635 breakpoint inserted in the parent is visible in the
636 child, even those added while stopped in a vfork
637 catchpoint. This will remove the breakpoints from the
638 parent also, but they'll be reinserted below. */
641 /* keep breakpoints list in sync. */
642 remove_breakpoints_pid (GET_PID (inferior_ptid
));
645 if (info_verbose
|| debug_linux_nat
)
647 target_terminal_ours ();
648 fprintf_filtered (gdb_stdlog
,
649 "Detaching after fork from "
650 "child process %d.\n",
654 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
658 struct inferior
*parent_inf
, *child_inf
;
659 struct cleanup
*old_chain
;
661 /* Add process to GDB's tables. */
662 child_inf
= add_inferior (child_pid
);
664 parent_inf
= current_inferior ();
665 child_inf
->attach_flag
= parent_inf
->attach_flag
;
666 copy_terminal_info (child_inf
, parent_inf
);
668 old_chain
= save_inferior_ptid ();
669 save_current_program_space ();
671 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
672 add_thread (inferior_ptid
);
673 child_lp
= add_lwp (inferior_ptid
);
674 child_lp
->stopped
= 1;
675 child_lp
->last_resume_kind
= resume_stop
;
677 /* If this is a vfork child, then the address-space is
678 shared with the parent. */
681 child_inf
->pspace
= parent_inf
->pspace
;
682 child_inf
->aspace
= parent_inf
->aspace
;
684 /* The parent will be frozen until the child is done
685 with the shared region. Keep track of the
687 child_inf
->vfork_parent
= parent_inf
;
688 child_inf
->pending_detach
= 0;
689 parent_inf
->vfork_child
= child_inf
;
690 parent_inf
->pending_detach
= 0;
694 child_inf
->aspace
= new_address_space ();
695 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
696 child_inf
->removable
= 1;
697 set_current_program_space (child_inf
->pspace
);
698 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
700 /* Let the shared library layer (solib-svr4) learn about
701 this new process, relocate the cloned exec, pull in
702 shared libraries, and install the solib event
703 breakpoint. If a "cloned-VM" event was propagated
704 better throughout the core, this wouldn't be
706 solib_create_inferior_hook (0);
709 /* Let the thread_db layer learn about this new process. */
710 check_for_thread_db ();
712 do_cleanups (old_chain
);
717 struct lwp_info
*parent_lp
;
718 struct inferior
*parent_inf
;
720 parent_inf
= current_inferior ();
722 /* If we detached from the child, then we have to be careful
723 to not insert breakpoints in the parent until the child
724 is done with the shared memory region. However, if we're
725 staying attached to the child, then we can and should
726 insert breakpoints, so that we can debug it. A
727 subsequent child exec or exit is enough to know when does
728 the child stops using the parent's address space. */
729 parent_inf
->waiting_for_vfork_done
= detach_fork
;
730 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
732 parent_lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
733 gdb_assert (linux_supports_tracefork_flag
>= 0);
735 if (linux_supports_tracevforkdone (0))
738 fprintf_unfiltered (gdb_stdlog
,
739 "LCFF: waiting for VFORK_DONE on %d\n",
741 parent_lp
->stopped
= 1;
743 /* We'll handle the VFORK_DONE event like any other
744 event, in target_wait. */
748 /* We can't insert breakpoints until the child has
749 finished with the shared memory region. We need to
750 wait until that happens. Ideal would be to just
752 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
753 - waitpid (parent_pid, &status, __WALL);
754 However, most architectures can't handle a syscall
755 being traced on the way out if it wasn't traced on
758 We might also think to loop, continuing the child
759 until it exits or gets a SIGTRAP. One problem is
760 that the child might call ptrace with PTRACE_TRACEME.
762 There's no simple and reliable way to figure out when
763 the vforked child will be done with its copy of the
764 shared memory. We could step it out of the syscall,
765 two instructions, let it go, and then single-step the
766 parent once. When we have hardware single-step, this
767 would work; with software single-step it could still
768 be made to work but we'd have to be able to insert
769 single-step breakpoints in the child, and we'd have
770 to insert -just- the single-step breakpoint in the
771 parent. Very awkward.
773 In the end, the best we can do is to make sure it
774 runs for a little while. Hopefully it will be out of
775 range of any breakpoints we reinsert. Usually this
776 is only the single-step breakpoint at vfork's return
780 fprintf_unfiltered (gdb_stdlog
,
781 "LCFF: no VFORK_DONE "
782 "support, sleeping a bit\n");
786 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
787 and leave it pending. The next linux_nat_resume call
788 will notice a pending event, and bypasses actually
789 resuming the inferior. */
790 parent_lp
->status
= 0;
791 parent_lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
792 parent_lp
->stopped
= 1;
794 /* If we're in async mode, need to tell the event loop
795 there's something here to process. */
796 if (target_can_async_p ())
803 struct inferior
*parent_inf
, *child_inf
;
804 struct lwp_info
*child_lp
;
805 struct program_space
*parent_pspace
;
807 if (info_verbose
|| debug_linux_nat
)
809 target_terminal_ours ();
811 fprintf_filtered (gdb_stdlog
,
812 _("Attaching after process %d "
813 "vfork to child process %d.\n"),
814 parent_pid
, child_pid
);
816 fprintf_filtered (gdb_stdlog
,
817 _("Attaching after process %d "
818 "fork to child process %d.\n"),
819 parent_pid
, child_pid
);
822 /* Add the new inferior first, so that the target_detach below
823 doesn't unpush the target. */
825 child_inf
= add_inferior (child_pid
);
827 parent_inf
= current_inferior ();
828 child_inf
->attach_flag
= parent_inf
->attach_flag
;
829 copy_terminal_info (child_inf
, parent_inf
);
831 parent_pspace
= parent_inf
->pspace
;
833 /* If we're vforking, we want to hold on to the parent until the
834 child exits or execs. At child exec or exit time we can
835 remove the old breakpoints from the parent and detach or
836 resume debugging it. Otherwise, detach the parent now; we'll
837 want to reuse it's program/address spaces, but we can't set
838 them to the child before removing breakpoints from the
839 parent, otherwise, the breakpoints module could decide to
840 remove breakpoints from the wrong process (since they'd be
841 assigned to the same address space). */
845 gdb_assert (child_inf
->vfork_parent
== NULL
);
846 gdb_assert (parent_inf
->vfork_child
== NULL
);
847 child_inf
->vfork_parent
= parent_inf
;
848 child_inf
->pending_detach
= 0;
849 parent_inf
->vfork_child
= child_inf
;
850 parent_inf
->pending_detach
= detach_fork
;
851 parent_inf
->waiting_for_vfork_done
= 0;
853 else if (detach_fork
)
854 target_detach (NULL
, 0);
856 /* Note that the detach above makes PARENT_INF dangling. */
858 /* Add the child thread to the appropriate lists, and switch to
859 this new thread, before cloning the program space, and
860 informing the solib layer about this new process. */
862 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
863 add_thread (inferior_ptid
);
864 child_lp
= add_lwp (inferior_ptid
);
865 child_lp
->stopped
= 1;
866 child_lp
->last_resume_kind
= resume_stop
;
868 /* If this is a vfork child, then the address-space is shared
869 with the parent. If we detached from the parent, then we can
870 reuse the parent's program/address spaces. */
871 if (has_vforked
|| detach_fork
)
873 child_inf
->pspace
= parent_pspace
;
874 child_inf
->aspace
= child_inf
->pspace
->aspace
;
878 child_inf
->aspace
= new_address_space ();
879 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
880 child_inf
->removable
= 1;
881 set_current_program_space (child_inf
->pspace
);
882 clone_program_space (child_inf
->pspace
, parent_pspace
);
884 /* Let the shared library layer (solib-svr4) learn about
885 this new process, relocate the cloned exec, pull in
886 shared libraries, and install the solib event breakpoint.
887 If a "cloned-VM" event was propagated better throughout
888 the core, this wouldn't be required. */
889 solib_create_inferior_hook (0);
892 /* Let the thread_db layer learn about this new process. */
893 check_for_thread_db ();
896 restore_child_signals_mask (&prev_mask
);
902 linux_child_insert_fork_catchpoint (int pid
)
904 return !linux_supports_tracefork (pid
);
908 linux_child_remove_fork_catchpoint (int pid
)
914 linux_child_insert_vfork_catchpoint (int pid
)
916 return !linux_supports_tracefork (pid
);
920 linux_child_remove_vfork_catchpoint (int pid
)
926 linux_child_insert_exec_catchpoint (int pid
)
928 return !linux_supports_tracefork (pid
);
932 linux_child_remove_exec_catchpoint (int pid
)
938 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
939 int table_size
, int *table
)
941 if (!linux_supports_tracesysgood (pid
))
944 /* On GNU/Linux, we ignore the arguments. It means that we only
945 enable the syscall catchpoints, but do not disable them.
947 Also, we do not use the `table' information because we do not
948 filter system calls here. We let GDB do the logic for us. */
952 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
953 are processes sharing the same VM space. A multi-threaded process
954 is basically a group of such processes. However, such a grouping
955 is almost entirely a user-space issue; the kernel doesn't enforce
956 such a grouping at all (this might change in the future). In
957 general, we'll rely on the threads library (i.e. the GNU/Linux
958 Threads library) to provide such a grouping.
960 It is perfectly well possible to write a multi-threaded application
961 without the assistance of a threads library, by using the clone
962 system call directly. This module should be able to give some
963 rudimentary support for debugging such applications if developers
964 specify the CLONE_PTRACE flag in the clone system call, and are
965 using the Linux kernel 2.4 or above.
967 Note that there are some peculiarities in GNU/Linux that affect
970 - In general one should specify the __WCLONE flag to waitpid in
971 order to make it report events for any of the cloned processes
972 (and leave it out for the initial process). However, if a cloned
973 process has exited the exit status is only reported if the
974 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
975 we cannot use it since GDB must work on older systems too.
977 - When a traced, cloned process exits and is waited for by the
978 debugger, the kernel reassigns it to the original parent and
979 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
980 library doesn't notice this, which leads to the "zombie problem":
981 When debugged a multi-threaded process that spawns a lot of
982 threads will run out of processes, even if the threads exit,
983 because the "zombies" stay around. */
985 /* List of known LWPs. */
986 struct lwp_info
*lwp_list
;
989 /* Original signal mask. */
990 static sigset_t normal_mask
;
992 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
993 _initialize_linux_nat. */
994 static sigset_t suspend_mask
;
996 /* Signals to block to make that sigsuspend work. */
997 static sigset_t blocked_mask
;
999 /* SIGCHLD action. */
1000 struct sigaction sigchld_action
;
1002 /* Block child signals (SIGCHLD and linux threads signals), and store
1003 the previous mask in PREV_MASK. */
1006 block_child_signals (sigset_t
*prev_mask
)
1008 /* Make sure SIGCHLD is blocked. */
1009 if (!sigismember (&blocked_mask
, SIGCHLD
))
1010 sigaddset (&blocked_mask
, SIGCHLD
);
1012 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1015 /* Restore child signals mask, previously returned by
1016 block_child_signals. */
1019 restore_child_signals_mask (sigset_t
*prev_mask
)
1021 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1024 /* Mask of signals to pass directly to the inferior. */
1025 static sigset_t pass_mask
;
1027 /* Update signals to pass to the inferior. */
1029 linux_nat_pass_signals (int numsigs
, unsigned char *pass_signals
)
1033 sigemptyset (&pass_mask
);
1035 for (signo
= 1; signo
< NSIG
; signo
++)
1037 int target_signo
= target_signal_from_host (signo
);
1038 if (target_signo
< numsigs
&& pass_signals
[target_signo
])
1039 sigaddset (&pass_mask
, signo
);
1045 /* Prototypes for local functions. */
1046 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1047 static int linux_thread_alive (ptid_t ptid
);
1048 static char *linux_child_pid_to_exec_file (int pid
);
1051 /* Convert wait status STATUS to a string. Used for printing debug
1055 status_to_str (int status
)
1057 static char buf
[64];
1059 if (WIFSTOPPED (status
))
1061 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1062 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1063 strsignal (SIGTRAP
));
1065 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1066 strsignal (WSTOPSIG (status
)));
1068 else if (WIFSIGNALED (status
))
1069 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1070 strsignal (WTERMSIG (status
)));
1072 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1077 /* Remove all LWPs belong to PID from the lwp list. */
1080 purge_lwp_list (int pid
)
1082 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1086 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1090 if (ptid_get_pid (lp
->ptid
) == pid
)
1093 lwp_list
= lp
->next
;
1095 lpprev
->next
= lp
->next
;
1104 /* Return the number of known LWPs in the tgid given by PID. */
1110 struct lwp_info
*lp
;
1112 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1113 if (ptid_get_pid (lp
->ptid
) == pid
)
1119 /* Add the LWP specified by PID to the list. Return a pointer to the
1120 structure describing the new LWP. The LWP should already be stopped
1121 (with an exception for the very first LWP). */
1123 static struct lwp_info
*
1124 add_lwp (ptid_t ptid
)
1126 struct lwp_info
*lp
;
1128 gdb_assert (is_lwp (ptid
));
1130 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1132 memset (lp
, 0, sizeof (struct lwp_info
));
1134 lp
->last_resume_kind
= resume_continue
;
1135 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1140 lp
->next
= lwp_list
;
1143 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1144 linux_nat_new_thread (ptid
);
1149 /* Remove the LWP specified by PID from the list. */
1152 delete_lwp (ptid_t ptid
)
1154 struct lwp_info
*lp
, *lpprev
;
1158 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1159 if (ptid_equal (lp
->ptid
, ptid
))
1166 lpprev
->next
= lp
->next
;
1168 lwp_list
= lp
->next
;
1173 /* Return a pointer to the structure describing the LWP corresponding
1174 to PID. If no corresponding LWP could be found, return NULL. */
1176 static struct lwp_info
*
1177 find_lwp_pid (ptid_t ptid
)
1179 struct lwp_info
*lp
;
1183 lwp
= GET_LWP (ptid
);
1185 lwp
= GET_PID (ptid
);
1187 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1188 if (lwp
== GET_LWP (lp
->ptid
))
1194 /* Call CALLBACK with its second argument set to DATA for every LWP in
1195 the list. If CALLBACK returns 1 for a particular LWP, return a
1196 pointer to the structure describing that LWP immediately.
1197 Otherwise return NULL. */
1200 iterate_over_lwps (ptid_t filter
,
1201 int (*callback
) (struct lwp_info
*, void *),
1204 struct lwp_info
*lp
, *lpnext
;
1206 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1210 if (ptid_match (lp
->ptid
, filter
))
1212 if ((*callback
) (lp
, data
))
1220 /* Update our internal state when changing from one checkpoint to
1221 another indicated by NEW_PTID. We can only switch single-threaded
1222 applications, so we only create one new LWP, and the previous list
1226 linux_nat_switch_fork (ptid_t new_ptid
)
1228 struct lwp_info
*lp
;
1230 purge_lwp_list (GET_PID (inferior_ptid
));
1232 lp
= add_lwp (new_ptid
);
1235 /* This changes the thread's ptid while preserving the gdb thread
1236 num. Also changes the inferior pid, while preserving the
1238 thread_change_ptid (inferior_ptid
, new_ptid
);
1240 /* We've just told GDB core that the thread changed target id, but,
1241 in fact, it really is a different thread, with different register
1243 registers_changed ();
1246 /* Handle the exit of a single thread LP. */
1249 exit_lwp (struct lwp_info
*lp
)
1251 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1255 if (print_thread_events
)
1256 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1258 delete_thread (lp
->ptid
);
1261 delete_lwp (lp
->ptid
);
1264 /* Detect `T (stopped)' in `/proc/PID/status'.
1265 Other states including `T (tracing stop)' are reported as false. */
1268 pid_is_stopped (pid_t pid
)
1274 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1275 status_file
= fopen (buf
, "r");
1276 if (status_file
!= NULL
)
1280 while (fgets (buf
, sizeof (buf
), status_file
))
1282 if (strncmp (buf
, "State:", 6) == 0)
1288 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1290 fclose (status_file
);
1295 /* Wait for the LWP specified by LP, which we have just attached to.
1296 Returns a wait status for that LWP, to cache. */
1299 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1302 pid_t new_pid
, pid
= GET_LWP (ptid
);
1305 if (pid_is_stopped (pid
))
1307 if (debug_linux_nat
)
1308 fprintf_unfiltered (gdb_stdlog
,
1309 "LNPAW: Attaching to a stopped process\n");
1311 /* The process is definitely stopped. It is in a job control
1312 stop, unless the kernel predates the TASK_STOPPED /
1313 TASK_TRACED distinction, in which case it might be in a
1314 ptrace stop. Make sure it is in a ptrace stop; from there we
1315 can kill it, signal it, et cetera.
1317 First make sure there is a pending SIGSTOP. Since we are
1318 already attached, the process can not transition from stopped
1319 to running without a PTRACE_CONT; so we know this signal will
1320 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1321 probably already in the queue (unless this kernel is old
1322 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1323 is not an RT signal, it can only be queued once. */
1324 kill_lwp (pid
, SIGSTOP
);
1326 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1327 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1328 ptrace (PTRACE_CONT
, pid
, 0, 0);
1331 /* Make sure the initial process is stopped. The user-level threads
1332 layer might want to poke around in the inferior, and that won't
1333 work if things haven't stabilized yet. */
1334 new_pid
= my_waitpid (pid
, &status
, 0);
1335 if (new_pid
== -1 && errno
== ECHILD
)
1338 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1340 /* Try again with __WCLONE to check cloned processes. */
1341 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1345 gdb_assert (pid
== new_pid
);
1347 if (!WIFSTOPPED (status
))
1349 /* The pid we tried to attach has apparently just exited. */
1350 if (debug_linux_nat
)
1351 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1352 pid
, status_to_str (status
));
1356 if (WSTOPSIG (status
) != SIGSTOP
)
1359 if (debug_linux_nat
)
1360 fprintf_unfiltered (gdb_stdlog
,
1361 "LNPAW: Received %s after attaching\n",
1362 status_to_str (status
));
1368 /* Attach to the LWP specified by PID. Return 0 if successful, -1 if
1369 the new LWP could not be attached, or 1 if we're already auto
1370 attached to this thread, but haven't processed the
1371 PTRACE_EVENT_CLONE event of its parent thread, so we just ignore
1372 its existance, without considering it an error. */
1375 lin_lwp_attach_lwp (ptid_t ptid
)
1377 struct lwp_info
*lp
;
1381 gdb_assert (is_lwp (ptid
));
1383 block_child_signals (&prev_mask
);
1385 lp
= find_lwp_pid (ptid
);
1386 lwpid
= GET_LWP (ptid
);
1388 /* We assume that we're already attached to any LWP that has an id
1389 equal to the overall process id, and to any LWP that is already
1390 in our list of LWPs. If we're not seeing exit events from threads
1391 and we've had PID wraparound since we last tried to stop all threads,
1392 this assumption might be wrong; fortunately, this is very unlikely
1394 if (lwpid
!= GET_PID (ptid
) && lp
== NULL
)
1396 int status
, cloned
= 0, signalled
= 0;
1398 if (ptrace (PTRACE_ATTACH
, lwpid
, 0, 0) < 0)
1400 if (linux_supports_tracefork_flag
)
1402 /* If we haven't stopped all threads when we get here,
1403 we may have seen a thread listed in thread_db's list,
1404 but not processed the PTRACE_EVENT_CLONE yet. If
1405 that's the case, ignore this new thread, and let
1406 normal event handling discover it later. */
1407 if (in_pid_list_p (stopped_pids
, lwpid
))
1409 /* We've already seen this thread stop, but we
1410 haven't seen the PTRACE_EVENT_CLONE extended
1412 restore_child_signals_mask (&prev_mask
);
1420 /* See if we've got a stop for this new child
1421 pending. If so, we're already attached. */
1422 new_pid
= my_waitpid (lwpid
, &status
, WNOHANG
);
1423 if (new_pid
== -1 && errno
== ECHILD
)
1424 new_pid
= my_waitpid (lwpid
, &status
, __WCLONE
| WNOHANG
);
1427 if (WIFSTOPPED (status
))
1428 add_to_pid_list (&stopped_pids
, lwpid
, status
);
1430 restore_child_signals_mask (&prev_mask
);
1436 /* If we fail to attach to the thread, issue a warning,
1437 but continue. One way this can happen is if thread
1438 creation is interrupted; as of Linux kernel 2.6.19, a
1439 bug may place threads in the thread list and then fail
1441 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1442 safe_strerror (errno
));
1443 restore_child_signals_mask (&prev_mask
);
1447 if (debug_linux_nat
)
1448 fprintf_unfiltered (gdb_stdlog
,
1449 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1450 target_pid_to_str (ptid
));
1452 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1453 if (!WIFSTOPPED (status
))
1455 restore_child_signals_mask (&prev_mask
);
1459 lp
= add_lwp (ptid
);
1461 lp
->cloned
= cloned
;
1462 lp
->signalled
= signalled
;
1463 if (WSTOPSIG (status
) != SIGSTOP
)
1466 lp
->status
= status
;
1469 target_post_attach (GET_LWP (lp
->ptid
));
1471 if (debug_linux_nat
)
1473 fprintf_unfiltered (gdb_stdlog
,
1474 "LLAL: waitpid %s received %s\n",
1475 target_pid_to_str (ptid
),
1476 status_to_str (status
));
1481 /* We assume that the LWP representing the original process is
1482 already stopped. Mark it as stopped in the data structure
1483 that the GNU/linux ptrace layer uses to keep track of
1484 threads. Note that this won't have already been done since
1485 the main thread will have, we assume, been stopped by an
1486 attach from a different layer. */
1488 lp
= add_lwp (ptid
);
1492 lp
->last_resume_kind
= resume_stop
;
1493 restore_child_signals_mask (&prev_mask
);
1498 linux_nat_create_inferior (struct target_ops
*ops
,
1499 char *exec_file
, char *allargs
, char **env
,
1502 #ifdef HAVE_PERSONALITY
1503 int personality_orig
= 0, personality_set
= 0;
1504 #endif /* HAVE_PERSONALITY */
1506 /* The fork_child mechanism is synchronous and calls target_wait, so
1507 we have to mask the async mode. */
1509 #ifdef HAVE_PERSONALITY
1510 if (disable_randomization
)
1513 personality_orig
= personality (0xffffffff);
1514 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1516 personality_set
= 1;
1517 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1519 if (errno
!= 0 || (personality_set
1520 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1521 warning (_("Error disabling address space randomization: %s"),
1522 safe_strerror (errno
));
1524 #endif /* HAVE_PERSONALITY */
1526 /* Make sure we report all signals during startup. */
1527 linux_nat_pass_signals (0, NULL
);
1529 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1531 #ifdef HAVE_PERSONALITY
1532 if (personality_set
)
1535 personality (personality_orig
);
1537 warning (_("Error restoring address space randomization: %s"),
1538 safe_strerror (errno
));
1540 #endif /* HAVE_PERSONALITY */
1544 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1546 struct lwp_info
*lp
;
1550 /* Make sure we report all signals during attach. */
1551 linux_nat_pass_signals (0, NULL
);
1553 linux_ops
->to_attach (ops
, args
, from_tty
);
1555 /* The ptrace base target adds the main thread with (pid,0,0)
1556 format. Decorate it with lwp info. */
1557 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1558 thread_change_ptid (inferior_ptid
, ptid
);
1560 /* Add the initial process as the first LWP to the list. */
1561 lp
= add_lwp (ptid
);
1563 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1565 if (!WIFSTOPPED (status
))
1567 if (WIFEXITED (status
))
1569 int exit_code
= WEXITSTATUS (status
);
1571 target_terminal_ours ();
1572 target_mourn_inferior ();
1574 error (_("Unable to attach: program exited normally."));
1576 error (_("Unable to attach: program exited with code %d."),
1579 else if (WIFSIGNALED (status
))
1581 enum target_signal signo
;
1583 target_terminal_ours ();
1584 target_mourn_inferior ();
1586 signo
= target_signal_from_host (WTERMSIG (status
));
1587 error (_("Unable to attach: program terminated with signal "
1589 target_signal_to_name (signo
),
1590 target_signal_to_string (signo
));
1593 internal_error (__FILE__
, __LINE__
,
1594 _("unexpected status %d for PID %ld"),
1595 status
, (long) GET_LWP (ptid
));
1600 /* Save the wait status to report later. */
1602 if (debug_linux_nat
)
1603 fprintf_unfiltered (gdb_stdlog
,
1604 "LNA: waitpid %ld, saving status %s\n",
1605 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1607 lp
->status
= status
;
1609 if (target_can_async_p ())
1610 target_async (inferior_event_handler
, 0);
1613 /* Get pending status of LP. */
1615 get_pending_status (struct lwp_info
*lp
, int *status
)
1617 enum target_signal signo
= TARGET_SIGNAL_0
;
1619 /* If we paused threads momentarily, we may have stored pending
1620 events in lp->status or lp->waitstatus (see stop_wait_callback),
1621 and GDB core hasn't seen any signal for those threads.
1622 Otherwise, the last signal reported to the core is found in the
1623 thread object's stop_signal.
1625 There's a corner case that isn't handled here at present. Only
1626 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1627 stop_signal make sense as a real signal to pass to the inferior.
1628 Some catchpoint related events, like
1629 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1630 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1631 those traps are debug API (ptrace in our case) related and
1632 induced; the inferior wouldn't see them if it wasn't being
1633 traced. Hence, we should never pass them to the inferior, even
1634 when set to pass state. Since this corner case isn't handled by
1635 infrun.c when proceeding with a signal, for consistency, neither
1636 do we handle it here (or elsewhere in the file we check for
1637 signal pass state). Normally SIGTRAP isn't set to pass state, so
1638 this is really a corner case. */
1640 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1641 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1642 else if (lp
->status
)
1643 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1644 else if (non_stop
&& !is_executing (lp
->ptid
))
1646 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1648 signo
= tp
->suspend
.stop_signal
;
1652 struct target_waitstatus last
;
1655 get_last_target_status (&last_ptid
, &last
);
1657 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1659 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1661 signo
= tp
->suspend
.stop_signal
;
1667 if (signo
== TARGET_SIGNAL_0
)
1669 if (debug_linux_nat
)
1670 fprintf_unfiltered (gdb_stdlog
,
1671 "GPT: lwp %s has no pending signal\n",
1672 target_pid_to_str (lp
->ptid
));
1674 else if (!signal_pass_state (signo
))
1676 if (debug_linux_nat
)
1677 fprintf_unfiltered (gdb_stdlog
,
1678 "GPT: lwp %s had signal %s, "
1679 "but it is in no pass state\n",
1680 target_pid_to_str (lp
->ptid
),
1681 target_signal_to_string (signo
));
1685 *status
= W_STOPCODE (target_signal_to_host (signo
));
1687 if (debug_linux_nat
)
1688 fprintf_unfiltered (gdb_stdlog
,
1689 "GPT: lwp %s has pending signal %s\n",
1690 target_pid_to_str (lp
->ptid
),
1691 target_signal_to_string (signo
));
1698 detach_callback (struct lwp_info
*lp
, void *data
)
1700 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1702 if (debug_linux_nat
&& lp
->status
)
1703 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1704 strsignal (WSTOPSIG (lp
->status
)),
1705 target_pid_to_str (lp
->ptid
));
1707 /* If there is a pending SIGSTOP, get rid of it. */
1710 if (debug_linux_nat
)
1711 fprintf_unfiltered (gdb_stdlog
,
1712 "DC: Sending SIGCONT to %s\n",
1713 target_pid_to_str (lp
->ptid
));
1715 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1719 /* We don't actually detach from the LWP that has an id equal to the
1720 overall process id just yet. */
1721 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1725 /* Pass on any pending signal for this LWP. */
1726 get_pending_status (lp
, &status
);
1729 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1730 WSTOPSIG (status
)) < 0)
1731 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1732 safe_strerror (errno
));
1734 if (debug_linux_nat
)
1735 fprintf_unfiltered (gdb_stdlog
,
1736 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1737 target_pid_to_str (lp
->ptid
),
1738 strsignal (WSTOPSIG (status
)));
1740 delete_lwp (lp
->ptid
);
1747 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1751 struct lwp_info
*main_lwp
;
1753 pid
= GET_PID (inferior_ptid
);
1755 if (target_can_async_p ())
1756 linux_nat_async (NULL
, 0);
1758 /* Stop all threads before detaching. ptrace requires that the
1759 thread is stopped to sucessfully detach. */
1760 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1761 /* ... and wait until all of them have reported back that
1762 they're no longer running. */
1763 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1765 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1767 /* Only the initial process should be left right now. */
1768 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1770 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1772 /* Pass on any pending signal for the last LWP. */
1773 if ((args
== NULL
|| *args
== '\0')
1774 && get_pending_status (main_lwp
, &status
) != -1
1775 && WIFSTOPPED (status
))
1777 /* Put the signal number in ARGS so that inf_ptrace_detach will
1778 pass it along with PTRACE_DETACH. */
1780 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1781 if (debug_linux_nat
)
1782 fprintf_unfiltered (gdb_stdlog
,
1783 "LND: Sending signal %s to %s\n",
1785 target_pid_to_str (main_lwp
->ptid
));
1788 delete_lwp (main_lwp
->ptid
);
1790 if (forks_exist_p ())
1792 /* Multi-fork case. The current inferior_ptid is being detached
1793 from, but there are other viable forks to debug. Detach from
1794 the current fork, and context-switch to the first
1796 linux_fork_detach (args
, from_tty
);
1798 if (non_stop
&& target_can_async_p ())
1799 target_async (inferior_event_handler
, 0);
1802 linux_ops
->to_detach (ops
, args
, from_tty
);
1808 resume_lwp (struct lwp_info
*lp
, int step
)
1812 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1814 if (inf
->vfork_child
!= NULL
)
1816 if (debug_linux_nat
)
1817 fprintf_unfiltered (gdb_stdlog
,
1818 "RC: Not resuming %s (vfork parent)\n",
1819 target_pid_to_str (lp
->ptid
));
1821 else if (lp
->status
== 0
1822 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
1824 if (debug_linux_nat
)
1825 fprintf_unfiltered (gdb_stdlog
,
1826 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1827 target_pid_to_str (lp
->ptid
));
1829 linux_ops
->to_resume (linux_ops
,
1830 pid_to_ptid (GET_LWP (lp
->ptid
)),
1831 step
, TARGET_SIGNAL_0
);
1832 if (debug_linux_nat
)
1833 fprintf_unfiltered (gdb_stdlog
,
1834 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1835 target_pid_to_str (lp
->ptid
));
1838 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1839 lp
->stopped_by_watchpoint
= 0;
1843 if (debug_linux_nat
)
1844 fprintf_unfiltered (gdb_stdlog
,
1845 "RC: Not resuming sibling %s (has pending)\n",
1846 target_pid_to_str (lp
->ptid
));
1851 if (debug_linux_nat
)
1852 fprintf_unfiltered (gdb_stdlog
,
1853 "RC: Not resuming sibling %s (not stopped)\n",
1854 target_pid_to_str (lp
->ptid
));
1859 resume_callback (struct lwp_info
*lp
, void *data
)
1866 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1869 lp
->last_resume_kind
= resume_stop
;
1874 resume_set_callback (struct lwp_info
*lp
, void *data
)
1877 lp
->last_resume_kind
= resume_continue
;
1882 linux_nat_resume (struct target_ops
*ops
,
1883 ptid_t ptid
, int step
, enum target_signal signo
)
1886 struct lwp_info
*lp
;
1889 if (debug_linux_nat
)
1890 fprintf_unfiltered (gdb_stdlog
,
1891 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1892 step
? "step" : "resume",
1893 target_pid_to_str (ptid
),
1894 (signo
!= TARGET_SIGNAL_0
1895 ? strsignal (target_signal_to_host (signo
)) : "0"),
1896 target_pid_to_str (inferior_ptid
));
1898 block_child_signals (&prev_mask
);
1900 /* A specific PTID means `step only this process id'. */
1901 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1902 || ptid_is_pid (ptid
));
1904 /* Mark the lwps we're resuming as resumed. */
1905 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1907 /* See if it's the current inferior that should be handled
1910 lp
= find_lwp_pid (inferior_ptid
);
1912 lp
= find_lwp_pid (ptid
);
1913 gdb_assert (lp
!= NULL
);
1915 /* Remember if we're stepping. */
1917 lp
->last_resume_kind
= step
? resume_step
: resume_continue
;
1919 /* If we have a pending wait status for this thread, there is no
1920 point in resuming the process. But first make sure that
1921 linux_nat_wait won't preemptively handle the event - we
1922 should never take this short-circuit if we are going to
1923 leave LP running, since we have skipped resuming all the
1924 other threads. This bit of code needs to be synchronized
1925 with linux_nat_wait. */
1927 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1930 && WSTOPSIG (lp
->status
)
1931 && sigismember (&pass_mask
, WSTOPSIG (lp
->status
)))
1933 if (debug_linux_nat
)
1934 fprintf_unfiltered (gdb_stdlog
,
1935 "LLR: Not short circuiting for ignored "
1936 "status 0x%x\n", lp
->status
);
1938 /* FIXME: What should we do if we are supposed to continue
1939 this thread with a signal? */
1940 gdb_assert (signo
== TARGET_SIGNAL_0
);
1941 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1946 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1948 /* FIXME: What should we do if we are supposed to continue
1949 this thread with a signal? */
1950 gdb_assert (signo
== TARGET_SIGNAL_0
);
1952 if (debug_linux_nat
)
1953 fprintf_unfiltered (gdb_stdlog
,
1954 "LLR: Short circuiting for status 0x%x\n",
1957 restore_child_signals_mask (&prev_mask
);
1958 if (target_can_async_p ())
1960 target_async (inferior_event_handler
, 0);
1961 /* Tell the event loop we have something to process. */
1967 /* Mark LWP as not stopped to prevent it from being continued by
1972 iterate_over_lwps (ptid
, resume_callback
, NULL
);
1974 /* Convert to something the lower layer understands. */
1975 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
1977 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
1978 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1979 lp
->stopped_by_watchpoint
= 0;
1981 if (debug_linux_nat
)
1982 fprintf_unfiltered (gdb_stdlog
,
1983 "LLR: %s %s, %s (resume event thread)\n",
1984 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
1985 target_pid_to_str (ptid
),
1986 (signo
!= TARGET_SIGNAL_0
1987 ? strsignal (target_signal_to_host (signo
)) : "0"));
1989 restore_child_signals_mask (&prev_mask
);
1990 if (target_can_async_p ())
1991 target_async (inferior_event_handler
, 0);
1994 /* Send a signal to an LWP. */
1997 kill_lwp (int lwpid
, int signo
)
1999 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2000 fails, then we are not using nptl threads and we should be using kill. */
2002 #ifdef HAVE_TKILL_SYSCALL
2004 static int tkill_failed
;
2011 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2012 if (errno
!= ENOSYS
)
2019 return kill (lwpid
, signo
);
2022 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2023 event, check if the core is interested in it: if not, ignore the
2024 event, and keep waiting; otherwise, we need to toggle the LWP's
2025 syscall entry/exit status, since the ptrace event itself doesn't
2026 indicate it, and report the trap to higher layers. */
2029 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2031 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2032 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2033 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2037 /* If we're stopping threads, there's a SIGSTOP pending, which
2038 makes it so that the LWP reports an immediate syscall return,
2039 followed by the SIGSTOP. Skip seeing that "return" using
2040 PTRACE_CONT directly, and let stop_wait_callback collect the
2041 SIGSTOP. Later when the thread is resumed, a new syscall
2042 entry event. If we didn't do this (and returned 0), we'd
2043 leave a syscall entry pending, and our caller, by using
2044 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2045 itself. Later, when the user re-resumes this LWP, we'd see
2046 another syscall entry event and we'd mistake it for a return.
2048 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2049 (leaving immediately with LWP->signalled set, without issuing
2050 a PTRACE_CONT), it would still be problematic to leave this
2051 syscall enter pending, as later when the thread is resumed,
2052 it would then see the same syscall exit mentioned above,
2053 followed by the delayed SIGSTOP, while the syscall didn't
2054 actually get to execute. It seems it would be even more
2055 confusing to the user. */
2057 if (debug_linux_nat
)
2058 fprintf_unfiltered (gdb_stdlog
,
2059 "LHST: ignoring syscall %d "
2060 "for LWP %ld (stopping threads), "
2061 "resuming with PTRACE_CONT for SIGSTOP\n",
2063 GET_LWP (lp
->ptid
));
2065 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2066 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2070 if (catch_syscall_enabled ())
2072 /* Always update the entry/return state, even if this particular
2073 syscall isn't interesting to the core now. In async mode,
2074 the user could install a new catchpoint for this syscall
2075 between syscall enter/return, and we'll need to know to
2076 report a syscall return if that happens. */
2077 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2078 ? TARGET_WAITKIND_SYSCALL_RETURN
2079 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2081 if (catching_syscall_number (syscall_number
))
2083 /* Alright, an event to report. */
2084 ourstatus
->kind
= lp
->syscall_state
;
2085 ourstatus
->value
.syscall_number
= syscall_number
;
2087 if (debug_linux_nat
)
2088 fprintf_unfiltered (gdb_stdlog
,
2089 "LHST: stopping for %s of syscall %d"
2092 == TARGET_WAITKIND_SYSCALL_ENTRY
2093 ? "entry" : "return",
2095 GET_LWP (lp
->ptid
));
2099 if (debug_linux_nat
)
2100 fprintf_unfiltered (gdb_stdlog
,
2101 "LHST: ignoring %s of syscall %d "
2103 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2104 ? "entry" : "return",
2106 GET_LWP (lp
->ptid
));
2110 /* If we had been syscall tracing, and hence used PT_SYSCALL
2111 before on this LWP, it could happen that the user removes all
2112 syscall catchpoints before we get to process this event.
2113 There are two noteworthy issues here:
2115 - When stopped at a syscall entry event, resuming with
2116 PT_STEP still resumes executing the syscall and reports a
2119 - Only PT_SYSCALL catches syscall enters. If we last
2120 single-stepped this thread, then this event can't be a
2121 syscall enter. If we last single-stepped this thread, this
2122 has to be a syscall exit.
2124 The points above mean that the next resume, be it PT_STEP or
2125 PT_CONTINUE, can not trigger a syscall trace event. */
2126 if (debug_linux_nat
)
2127 fprintf_unfiltered (gdb_stdlog
,
2128 "LHST: caught syscall event "
2129 "with no syscall catchpoints."
2130 " %d for LWP %ld, ignoring\n",
2132 GET_LWP (lp
->ptid
));
2133 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2136 /* The core isn't interested in this event. For efficiency, avoid
2137 stopping all threads only to have the core resume them all again.
2138 Since we're not stopping threads, if we're still syscall tracing
2139 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2140 subsequent syscall. Simply resume using the inf-ptrace layer,
2141 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2143 /* Note that gdbarch_get_syscall_number may access registers, hence
2145 registers_changed ();
2146 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2147 lp
->step
, TARGET_SIGNAL_0
);
2151 /* Handle a GNU/Linux extended wait response. If we see a clone
2152 event, we need to add the new LWP to our list (and not report the
2153 trap to higher layers). This function returns non-zero if the
2154 event should be ignored and we should wait again. If STOPPING is
2155 true, the new LWP remains stopped, otherwise it is continued. */
2158 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2161 int pid
= GET_LWP (lp
->ptid
);
2162 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2163 int event
= status
>> 16;
2165 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2166 || event
== PTRACE_EVENT_CLONE
)
2168 unsigned long new_pid
;
2171 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2173 /* If we haven't already seen the new PID stop, wait for it now. */
2174 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2176 /* The new child has a pending SIGSTOP. We can't affect it until it
2177 hits the SIGSTOP, but we're already attached. */
2178 ret
= my_waitpid (new_pid
, &status
,
2179 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2181 perror_with_name (_("waiting for new child"));
2182 else if (ret
!= new_pid
)
2183 internal_error (__FILE__
, __LINE__
,
2184 _("wait returned unexpected PID %d"), ret
);
2185 else if (!WIFSTOPPED (status
))
2186 internal_error (__FILE__
, __LINE__
,
2187 _("wait returned unexpected status 0x%x"), status
);
2190 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2192 if (event
== PTRACE_EVENT_FORK
2193 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2195 /* Handle checkpointing by linux-fork.c here as a special
2196 case. We don't want the follow-fork-mode or 'catch fork'
2197 to interfere with this. */
2199 /* This won't actually modify the breakpoint list, but will
2200 physically remove the breakpoints from the child. */
2201 detach_breakpoints (new_pid
);
2203 /* Retain child fork in ptrace (stopped) state. */
2204 if (!find_fork_pid (new_pid
))
2207 /* Report as spurious, so that infrun doesn't want to follow
2208 this fork. We're actually doing an infcall in
2210 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2211 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2213 /* Report the stop to the core. */
2217 if (event
== PTRACE_EVENT_FORK
)
2218 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2219 else if (event
== PTRACE_EVENT_VFORK
)
2220 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2223 struct lwp_info
*new_lp
;
2225 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2227 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2229 new_lp
->stopped
= 1;
2231 if (WSTOPSIG (status
) != SIGSTOP
)
2233 /* This can happen if someone starts sending signals to
2234 the new thread before it gets a chance to run, which
2235 have a lower number than SIGSTOP (e.g. SIGUSR1).
2236 This is an unlikely case, and harder to handle for
2237 fork / vfork than for clone, so we do not try - but
2238 we handle it for clone events here. We'll send
2239 the other signal on to the thread below. */
2241 new_lp
->signalled
= 1;
2248 /* Add the new thread to GDB's lists as soon as possible
2251 1) the frontend doesn't have to wait for a stop to
2254 2) we tag it with the correct running state. */
2256 /* If the thread_db layer is active, let it know about
2257 this new thread, and add it to GDB's list. */
2258 if (!thread_db_attach_lwp (new_lp
->ptid
))
2260 /* We're not using thread_db. Add it to GDB's
2262 target_post_attach (GET_LWP (new_lp
->ptid
));
2263 add_thread (new_lp
->ptid
);
2268 set_running (new_lp
->ptid
, 1);
2269 set_executing (new_lp
->ptid
, 1);
2273 /* Note the need to use the low target ops to resume, to
2274 handle resuming with PT_SYSCALL if we have syscall
2278 enum target_signal signo
;
2280 new_lp
->stopped
= 0;
2281 new_lp
->resumed
= 1;
2282 new_lp
->last_resume_kind
= resume_continue
;
2285 ? target_signal_from_host (WSTOPSIG (status
))
2288 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2295 /* We created NEW_LP so it cannot yet contain STATUS. */
2296 gdb_assert (new_lp
->status
== 0);
2298 /* Save the wait status to report later. */
2299 if (debug_linux_nat
)
2300 fprintf_unfiltered (gdb_stdlog
,
2301 "LHEW: waitpid of new LWP %ld, "
2302 "saving status %s\n",
2303 (long) GET_LWP (new_lp
->ptid
),
2304 status_to_str (status
));
2305 new_lp
->status
= status
;
2309 if (debug_linux_nat
)
2310 fprintf_unfiltered (gdb_stdlog
,
2311 "LHEW: Got clone event "
2312 "from LWP %ld, resuming\n",
2313 GET_LWP (lp
->ptid
));
2314 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2315 0, TARGET_SIGNAL_0
);
2323 if (event
== PTRACE_EVENT_EXEC
)
2325 if (debug_linux_nat
)
2326 fprintf_unfiltered (gdb_stdlog
,
2327 "LHEW: Got exec event from LWP %ld\n",
2328 GET_LWP (lp
->ptid
));
2330 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2331 ourstatus
->value
.execd_pathname
2332 = xstrdup (linux_child_pid_to_exec_file (pid
));
2337 if (event
== PTRACE_EVENT_VFORK_DONE
)
2339 if (current_inferior ()->waiting_for_vfork_done
)
2341 if (debug_linux_nat
)
2342 fprintf_unfiltered (gdb_stdlog
,
2343 "LHEW: Got expected PTRACE_EVENT_"
2344 "VFORK_DONE from LWP %ld: stopping\n",
2345 GET_LWP (lp
->ptid
));
2347 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2351 if (debug_linux_nat
)
2352 fprintf_unfiltered (gdb_stdlog
,
2353 "LHEW: Got PTRACE_EVENT_VFORK_DONE "
2354 "from LWP %ld: resuming\n",
2355 GET_LWP (lp
->ptid
));
2356 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2360 internal_error (__FILE__
, __LINE__
,
2361 _("unknown ptrace event %d"), event
);
2364 /* Return non-zero if LWP is a zombie. */
2367 linux_lwp_is_zombie (long lwp
)
2369 char buffer
[MAXPATHLEN
];
2373 xsnprintf (buffer
, sizeof (buffer
), "/proc/%ld/status", lwp
);
2374 procfile
= fopen (buffer
, "r");
2375 if (procfile
== NULL
)
2377 warning (_("unable to open /proc file '%s'"), buffer
);
2380 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
2381 if (strcmp (buffer
, "State:\tZ (zombie)\n") == 0)
2391 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2395 wait_lwp (struct lwp_info
*lp
)
2399 int thread_dead
= 0;
2402 gdb_assert (!lp
->stopped
);
2403 gdb_assert (lp
->status
== 0);
2405 /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */
2406 block_child_signals (&prev_mask
);
2410 /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind
2411 was right and we should just call sigsuspend. */
2413 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, WNOHANG
);
2414 if (pid
== -1 && errno
== ECHILD
)
2415 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
| WNOHANG
);
2416 if (pid
== -1 && errno
== ECHILD
)
2418 /* The thread has previously exited. We need to delete it
2419 now because, for some vendor 2.4 kernels with NPTL
2420 support backported, there won't be an exit event unless
2421 it is the main thread. 2.6 kernels will report an exit
2422 event for each thread that exits, as expected. */
2424 if (debug_linux_nat
)
2425 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2426 target_pid_to_str (lp
->ptid
));
2431 /* Bugs 10970, 12702.
2432 Thread group leader may have exited in which case we'll lock up in
2433 waitpid if there are other threads, even if they are all zombies too.
2434 Basically, we're not supposed to use waitpid this way.
2435 __WCLONE is not applicable for the leader so we can't use that.
2436 LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED
2437 process; it gets ESRCH both for the zombie and for running processes.
2439 As a workaround, check if we're waiting for the thread group leader and
2440 if it's a zombie, and avoid calling waitpid if it is.
2442 This is racy, what if the tgl becomes a zombie right after we check?
2443 Therefore always use WNOHANG with sigsuspend - it is equivalent to
2444 waiting waitpid but the linux_lwp_is_zombie is safe this way. */
2446 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
)
2447 && linux_lwp_is_zombie (GET_LWP (lp
->ptid
)))
2450 if (debug_linux_nat
)
2451 fprintf_unfiltered (gdb_stdlog
,
2452 "WL: Thread group leader %s vanished.\n",
2453 target_pid_to_str (lp
->ptid
));
2457 /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers
2458 get invoked despite our caller had them intentionally blocked by
2459 block_child_signals. This is sensitive only to the loop of
2460 linux_nat_wait_1 and there if we get called my_waitpid gets called
2461 again before it gets to sigsuspend so we can safely let the handlers
2462 get executed here. */
2464 sigsuspend (&suspend_mask
);
2467 restore_child_signals_mask (&prev_mask
);
2471 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2473 if (debug_linux_nat
)
2475 fprintf_unfiltered (gdb_stdlog
,
2476 "WL: waitpid %s received %s\n",
2477 target_pid_to_str (lp
->ptid
),
2478 status_to_str (status
));
2481 /* Check if the thread has exited. */
2482 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2485 if (debug_linux_nat
)
2486 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2487 target_pid_to_str (lp
->ptid
));
2497 gdb_assert (WIFSTOPPED (status
));
2499 /* Handle GNU/Linux's syscall SIGTRAPs. */
2500 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2502 /* No longer need the sysgood bit. The ptrace event ends up
2503 recorded in lp->waitstatus if we care for it. We can carry
2504 on handling the event like a regular SIGTRAP from here
2506 status
= W_STOPCODE (SIGTRAP
);
2507 if (linux_handle_syscall_trap (lp
, 1))
2508 return wait_lwp (lp
);
2511 /* Handle GNU/Linux's extended waitstatus for trace events. */
2512 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2514 if (debug_linux_nat
)
2515 fprintf_unfiltered (gdb_stdlog
,
2516 "WL: Handling extended status 0x%06x\n",
2518 if (linux_handle_extended_wait (lp
, status
, 1))
2519 return wait_lwp (lp
);
2525 /* Save the most recent siginfo for LP. This is currently only called
2526 for SIGTRAP; some ports use the si_addr field for
2527 target_stopped_data_address. In the future, it may also be used to
2528 restore the siginfo of requeued signals. */
2531 save_siginfo (struct lwp_info
*lp
)
2534 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2535 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2538 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2541 /* Send a SIGSTOP to LP. */
2544 stop_callback (struct lwp_info
*lp
, void *data
)
2546 if (!lp
->stopped
&& !lp
->signalled
)
2550 if (debug_linux_nat
)
2552 fprintf_unfiltered (gdb_stdlog
,
2553 "SC: kill %s **<SIGSTOP>**\n",
2554 target_pid_to_str (lp
->ptid
));
2557 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2558 if (debug_linux_nat
)
2560 fprintf_unfiltered (gdb_stdlog
,
2561 "SC: lwp kill %d %s\n",
2563 errno
? safe_strerror (errno
) : "ERRNO-OK");
2567 gdb_assert (lp
->status
== 0);
2573 /* Return non-zero if LWP PID has a pending SIGINT. */
2576 linux_nat_has_pending_sigint (int pid
)
2578 sigset_t pending
, blocked
, ignored
;
2580 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2582 if (sigismember (&pending
, SIGINT
)
2583 && !sigismember (&ignored
, SIGINT
))
2589 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2592 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2594 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2595 flag to consume the next one. */
2596 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2597 && WSTOPSIG (lp
->status
) == SIGINT
)
2600 lp
->ignore_sigint
= 1;
2605 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2606 This function is called after we know the LWP has stopped; if the LWP
2607 stopped before the expected SIGINT was delivered, then it will never have
2608 arrived. Also, if the signal was delivered to a shared queue and consumed
2609 by a different thread, it will never be delivered to this LWP. */
2612 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2614 if (!lp
->ignore_sigint
)
2617 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2619 if (debug_linux_nat
)
2620 fprintf_unfiltered (gdb_stdlog
,
2621 "MCIS: Clearing bogus flag for %s\n",
2622 target_pid_to_str (lp
->ptid
));
2623 lp
->ignore_sigint
= 0;
2627 /* Fetch the possible triggered data watchpoint info and store it in
2630 On some archs, like x86, that use debug registers to set
2631 watchpoints, it's possible that the way to know which watched
2632 address trapped, is to check the register that is used to select
2633 which address to watch. Problem is, between setting the watchpoint
2634 and reading back which data address trapped, the user may change
2635 the set of watchpoints, and, as a consequence, GDB changes the
2636 debug registers in the inferior. To avoid reading back a stale
2637 stopped-data-address when that happens, we cache in LP the fact
2638 that a watchpoint trapped, and the corresponding data address, as
2639 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2640 registers meanwhile, we have the cached data we can rely on. */
2643 save_sigtrap (struct lwp_info
*lp
)
2645 struct cleanup
*old_chain
;
2647 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2649 lp
->stopped_by_watchpoint
= 0;
2653 old_chain
= save_inferior_ptid ();
2654 inferior_ptid
= lp
->ptid
;
2656 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2658 if (lp
->stopped_by_watchpoint
)
2660 if (linux_ops
->to_stopped_data_address
!= NULL
)
2661 lp
->stopped_data_address_p
=
2662 linux_ops
->to_stopped_data_address (¤t_target
,
2663 &lp
->stopped_data_address
);
2665 lp
->stopped_data_address_p
= 0;
2668 do_cleanups (old_chain
);
2671 /* See save_sigtrap. */
2674 linux_nat_stopped_by_watchpoint (void)
2676 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2678 gdb_assert (lp
!= NULL
);
2680 return lp
->stopped_by_watchpoint
;
2684 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2686 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2688 gdb_assert (lp
!= NULL
);
2690 *addr_p
= lp
->stopped_data_address
;
2692 return lp
->stopped_data_address_p
;
2695 /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
2698 sigtrap_is_event (int status
)
2700 return WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
;
2703 /* SIGTRAP-like events recognizer. */
2705 static int (*linux_nat_status_is_event
) (int status
) = sigtrap_is_event
;
2707 /* Check for SIGTRAP-like events in LP. */
2710 linux_nat_lp_status_is_event (struct lwp_info
*lp
)
2712 /* We check for lp->waitstatus in addition to lp->status, because we can
2713 have pending process exits recorded in lp->status
2714 and W_EXITCODE(0,0) == 0. We should probably have an additional
2715 lp->status_p flag. */
2717 return (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2718 && linux_nat_status_is_event (lp
->status
));
2721 /* Set alternative SIGTRAP-like events recognizer. If
2722 breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
2726 linux_nat_set_status_is_event (struct target_ops
*t
,
2727 int (*status_is_event
) (int status
))
2729 linux_nat_status_is_event
= status_is_event
;
2732 /* Wait until LP is stopped. */
2735 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2737 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2739 /* If this is a vfork parent, bail out, it is not going to report
2740 any SIGSTOP until the vfork is done with. */
2741 if (inf
->vfork_child
!= NULL
)
2748 status
= wait_lwp (lp
);
2752 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2753 && WSTOPSIG (status
) == SIGINT
)
2755 lp
->ignore_sigint
= 0;
2758 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2759 if (debug_linux_nat
)
2760 fprintf_unfiltered (gdb_stdlog
,
2761 "PTRACE_CONT %s, 0, 0 (%s) "
2762 "(discarding SIGINT)\n",
2763 target_pid_to_str (lp
->ptid
),
2764 errno
? safe_strerror (errno
) : "OK");
2766 return stop_wait_callback (lp
, NULL
);
2769 maybe_clear_ignore_sigint (lp
);
2771 if (WSTOPSIG (status
) != SIGSTOP
)
2773 if (linux_nat_status_is_event (status
))
2775 /* If a LWP other than the LWP that we're reporting an
2776 event for has hit a GDB breakpoint (as opposed to
2777 some random trap signal), then just arrange for it to
2778 hit it again later. We don't keep the SIGTRAP status
2779 and don't forward the SIGTRAP signal to the LWP. We
2780 will handle the current event, eventually we will
2781 resume all LWPs, and this one will get its breakpoint
2784 If we do not do this, then we run the risk that the
2785 user will delete or disable the breakpoint, but the
2786 thread will have already tripped on it. */
2788 /* Save the trap's siginfo in case we need it later. */
2793 /* Now resume this LWP and get the SIGSTOP event. */
2795 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2796 if (debug_linux_nat
)
2798 fprintf_unfiltered (gdb_stdlog
,
2799 "PTRACE_CONT %s, 0, 0 (%s)\n",
2800 target_pid_to_str (lp
->ptid
),
2801 errno
? safe_strerror (errno
) : "OK");
2803 fprintf_unfiltered (gdb_stdlog
,
2804 "SWC: Candidate SIGTRAP event in %s\n",
2805 target_pid_to_str (lp
->ptid
));
2807 /* Hold this event/waitstatus while we check to see if
2808 there are any more (we still want to get that SIGSTOP). */
2809 stop_wait_callback (lp
, NULL
);
2811 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2812 there's another event, throw it back into the
2816 if (debug_linux_nat
)
2817 fprintf_unfiltered (gdb_stdlog
,
2818 "SWC: kill %s, %s\n",
2819 target_pid_to_str (lp
->ptid
),
2820 status_to_str ((int) status
));
2821 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2824 /* Save the sigtrap event. */
2825 lp
->status
= status
;
2830 /* The thread was stopped with a signal other than
2831 SIGSTOP, and didn't accidentally trip a breakpoint. */
2833 if (debug_linux_nat
)
2835 fprintf_unfiltered (gdb_stdlog
,
2836 "SWC: Pending event %s in %s\n",
2837 status_to_str ((int) status
),
2838 target_pid_to_str (lp
->ptid
));
2840 /* Now resume this LWP and get the SIGSTOP event. */
2842 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2843 if (debug_linux_nat
)
2844 fprintf_unfiltered (gdb_stdlog
,
2845 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2846 target_pid_to_str (lp
->ptid
),
2847 errno
? safe_strerror (errno
) : "OK");
2849 /* Hold this event/waitstatus while we check to see if
2850 there are any more (we still want to get that SIGSTOP). */
2851 stop_wait_callback (lp
, NULL
);
2853 /* If the lp->status field is still empty, use it to
2854 hold this event. If not, then this event must be
2855 returned to the event queue of the LWP. */
2858 if (debug_linux_nat
)
2860 fprintf_unfiltered (gdb_stdlog
,
2861 "SWC: kill %s, %s\n",
2862 target_pid_to_str (lp
->ptid
),
2863 status_to_str ((int) status
));
2865 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2868 lp
->status
= status
;
2874 /* We caught the SIGSTOP that we intended to catch, so
2875 there's no SIGSTOP pending. */
2884 /* Return non-zero if LP has a wait status pending. */
2887 status_callback (struct lwp_info
*lp
, void *data
)
2889 /* Only report a pending wait status if we pretend that this has
2890 indeed been resumed. */
2894 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2896 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2897 or a pending process exit. Note that `W_EXITCODE(0,0) ==
2898 0', so a clean process exit can not be stored pending in
2899 lp->status, it is indistinguishable from
2900 no-pending-status. */
2904 if (lp
->status
!= 0)
2910 /* Return non-zero if LP isn't stopped. */
2913 running_callback (struct lwp_info
*lp
, void *data
)
2915 return (!lp
->stopped
2916 || ((lp
->status
!= 0
2917 || lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2921 /* Count the LWP's that have had events. */
2924 count_events_callback (struct lwp_info
*lp
, void *data
)
2928 gdb_assert (count
!= NULL
);
2930 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2931 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2937 /* Select the LWP (if any) that is currently being single-stepped. */
2940 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2942 if (lp
->last_resume_kind
== resume_step
2949 /* Select the Nth LWP that has had a SIGTRAP event. */
2952 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2954 int *selector
= data
;
2956 gdb_assert (selector
!= NULL
);
2958 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2959 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2960 if ((*selector
)-- == 0)
2967 cancel_breakpoint (struct lwp_info
*lp
)
2969 /* Arrange for a breakpoint to be hit again later. We don't keep
2970 the SIGTRAP status and don't forward the SIGTRAP signal to the
2971 LWP. We will handle the current event, eventually we will resume
2972 this LWP, and this breakpoint will trap again.
2974 If we do not do this, then we run the risk that the user will
2975 delete or disable the breakpoint, but the LWP will have already
2978 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2979 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2982 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2983 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2985 if (debug_linux_nat
)
2986 fprintf_unfiltered (gdb_stdlog
,
2987 "CB: Push back breakpoint for %s\n",
2988 target_pid_to_str (lp
->ptid
));
2990 /* Back up the PC if necessary. */
2991 if (gdbarch_decr_pc_after_break (gdbarch
))
2992 regcache_write_pc (regcache
, pc
);
3000 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
3002 struct lwp_info
*event_lp
= data
;
3004 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
3008 /* If a LWP other than the LWP that we're reporting an event for has
3009 hit a GDB breakpoint (as opposed to some random trap signal),
3010 then just arrange for it to hit it again later. We don't keep
3011 the SIGTRAP status and don't forward the SIGTRAP signal to the
3012 LWP. We will handle the current event, eventually we will resume
3013 all LWPs, and this one will get its breakpoint trap again.
3015 If we do not do this, then we run the risk that the user will
3016 delete or disable the breakpoint, but the LWP will have already
3019 if (linux_nat_lp_status_is_event (lp
)
3020 && cancel_breakpoint (lp
))
3021 /* Throw away the SIGTRAP. */
3027 /* Select one LWP out of those that have events pending. */
3030 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
3033 int random_selector
;
3034 struct lwp_info
*event_lp
;
3036 /* Record the wait status for the original LWP. */
3037 (*orig_lp
)->status
= *status
;
3039 /* Give preference to any LWP that is being single-stepped. */
3040 event_lp
= iterate_over_lwps (filter
,
3041 select_singlestep_lwp_callback
, NULL
);
3042 if (event_lp
!= NULL
)
3044 if (debug_linux_nat
)
3045 fprintf_unfiltered (gdb_stdlog
,
3046 "SEL: Select single-step %s\n",
3047 target_pid_to_str (event_lp
->ptid
));
3051 /* No single-stepping LWP. Select one at random, out of those
3052 which have had SIGTRAP events. */
3054 /* First see how many SIGTRAP events we have. */
3055 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
3057 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
3058 random_selector
= (int)
3059 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
3061 if (debug_linux_nat
&& num_events
> 1)
3062 fprintf_unfiltered (gdb_stdlog
,
3063 "SEL: Found %d SIGTRAP events, selecting #%d\n",
3064 num_events
, random_selector
);
3066 event_lp
= iterate_over_lwps (filter
,
3067 select_event_lwp_callback
,
3071 if (event_lp
!= NULL
)
3073 /* Switch the event LWP. */
3074 *orig_lp
= event_lp
;
3075 *status
= event_lp
->status
;
3078 /* Flush the wait status for the event LWP. */
3079 (*orig_lp
)->status
= 0;
3082 /* Return non-zero if LP has been resumed. */
3085 resumed_callback (struct lwp_info
*lp
, void *data
)
3090 /* Stop an active thread, verify it still exists, then resume it. */
3093 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
3097 enum resume_kind last_resume_kind
= lp
->last_resume_kind
;
3098 ptid_t ptid
= lp
->ptid
;
3100 stop_callback (lp
, NULL
);
3101 stop_wait_callback (lp
, NULL
);
3103 /* Resume if the lwp still exists, and the core wanted it
3105 if (last_resume_kind
!= resume_stop
)
3107 lp
= find_lwp_pid (ptid
);
3109 resume_lwp (lp
, lp
->step
);
3115 /* Check if we should go on and pass this event to common code.
3116 Return the affected lwp if we are, or NULL otherwise. */
3117 static struct lwp_info
*
3118 linux_nat_filter_event (int lwpid
, int status
, int options
)
3120 struct lwp_info
*lp
;
3122 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3124 /* Check for stop events reported by a process we didn't already
3125 know about - anything not already in our LWP list.
3127 If we're expecting to receive stopped processes after
3128 fork, vfork, and clone events, then we'll just add the
3129 new one to our list and go back to waiting for the event
3130 to be reported - the stopped process might be returned
3131 from waitpid before or after the event is. */
3132 if (WIFSTOPPED (status
) && !lp
)
3134 add_to_pid_list (&stopped_pids
, lwpid
, status
);
3138 /* Make sure we don't report an event for the exit of an LWP not in
3139 our list, i.e. not part of the current process. This can happen
3140 if we detach from a program we originally forked and then it
3142 if (!WIFSTOPPED (status
) && !lp
)
3145 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3146 CLONE_PTRACE processes which do not use the thread library -
3147 otherwise we wouldn't find the new LWP this way. That doesn't
3148 currently work, and the following code is currently unreachable
3149 due to the two blocks above. If it's fixed some day, this code
3150 should be broken out into a function so that we can also pick up
3151 LWPs from the new interface. */
3154 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3155 if (options
& __WCLONE
)
3158 gdb_assert (WIFSTOPPED (status
)
3159 && WSTOPSIG (status
) == SIGSTOP
);
3162 if (!in_thread_list (inferior_ptid
))
3164 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3165 GET_PID (inferior_ptid
));
3166 add_thread (inferior_ptid
);
3169 add_thread (lp
->ptid
);
3172 /* Handle GNU/Linux's syscall SIGTRAPs. */
3173 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3175 /* No longer need the sysgood bit. The ptrace event ends up
3176 recorded in lp->waitstatus if we care for it. We can carry
3177 on handling the event like a regular SIGTRAP from here
3179 status
= W_STOPCODE (SIGTRAP
);
3180 if (linux_handle_syscall_trap (lp
, 0))
3184 /* Handle GNU/Linux's extended waitstatus for trace events. */
3185 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3187 if (debug_linux_nat
)
3188 fprintf_unfiltered (gdb_stdlog
,
3189 "LLW: Handling extended status 0x%06x\n",
3191 if (linux_handle_extended_wait (lp
, status
, 0))
3195 if (linux_nat_status_is_event (status
))
3197 /* Save the trap's siginfo in case we need it later. */
3203 /* Check if the thread has exited. */
3204 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3205 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3207 /* If this is the main thread, we must stop all threads and verify
3208 if they are still alive. This is because in the nptl thread model
3209 on Linux 2.4, there is no signal issued for exiting LWPs
3210 other than the main thread. We only get the main thread exit
3211 signal once all child threads have already exited. If we
3212 stop all the threads and use the stop_wait_callback to check
3213 if they have exited we can determine whether this signal
3214 should be ignored or whether it means the end of the debugged
3215 application, regardless of which threading model is being
3217 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3220 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3221 stop_and_resume_callback
, NULL
);
3224 if (debug_linux_nat
)
3225 fprintf_unfiltered (gdb_stdlog
,
3226 "LLW: %s exited.\n",
3227 target_pid_to_str (lp
->ptid
));
3229 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3231 /* If there is at least one more LWP, then the exit signal
3232 was not the end of the debugged application and should be
3239 /* Check if the current LWP has previously exited. In the nptl
3240 thread model, LWPs other than the main thread do not issue
3241 signals when they exit so we must check whenever the thread has
3242 stopped. A similar check is made in stop_wait_callback(). */
3243 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3245 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3247 if (debug_linux_nat
)
3248 fprintf_unfiltered (gdb_stdlog
,
3249 "LLW: %s exited.\n",
3250 target_pid_to_str (lp
->ptid
));
3254 /* Make sure there is at least one thread running. */
3255 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3257 /* Discard the event. */
3261 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3262 an attempt to stop an LWP. */
3264 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3266 if (debug_linux_nat
)
3267 fprintf_unfiltered (gdb_stdlog
,
3268 "LLW: Delayed SIGSTOP caught for %s.\n",
3269 target_pid_to_str (lp
->ptid
));
3273 if (lp
->last_resume_kind
!= resume_stop
)
3275 /* This is a delayed SIGSTOP. */
3277 registers_changed ();
3279 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3280 lp
->step
, TARGET_SIGNAL_0
);
3281 if (debug_linux_nat
)
3282 fprintf_unfiltered (gdb_stdlog
,
3283 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3285 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3286 target_pid_to_str (lp
->ptid
));
3289 gdb_assert (lp
->resumed
);
3291 /* Discard the event. */
3296 /* Make sure we don't report a SIGINT that we have already displayed
3297 for another thread. */
3298 if (lp
->ignore_sigint
3299 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3301 if (debug_linux_nat
)
3302 fprintf_unfiltered (gdb_stdlog
,
3303 "LLW: Delayed SIGINT caught for %s.\n",
3304 target_pid_to_str (lp
->ptid
));
3306 /* This is a delayed SIGINT. */
3307 lp
->ignore_sigint
= 0;
3309 registers_changed ();
3310 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3311 lp
->step
, TARGET_SIGNAL_0
);
3312 if (debug_linux_nat
)
3313 fprintf_unfiltered (gdb_stdlog
,
3314 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3316 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3317 target_pid_to_str (lp
->ptid
));
3320 gdb_assert (lp
->resumed
);
3322 /* Discard the event. */
3326 /* An interesting event. */
3328 lp
->status
= status
;
3333 linux_nat_wait_1 (struct target_ops
*ops
,
3334 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3337 static sigset_t prev_mask
;
3338 enum resume_kind last_resume_kind
;
3339 struct lwp_info
*lp
= NULL
;
3344 if (debug_linux_nat
)
3345 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3347 /* The first time we get here after starting a new inferior, we may
3348 not have added it to the LWP list yet - this is the earliest
3349 moment at which we know its PID. */
3350 if (ptid_is_pid (inferior_ptid
))
3352 /* Upgrade the main thread's ptid. */
3353 thread_change_ptid (inferior_ptid
,
3354 BUILD_LWP (GET_PID (inferior_ptid
),
3355 GET_PID (inferior_ptid
)));
3357 lp
= add_lwp (inferior_ptid
);
3361 /* Make sure SIGCHLD is blocked. */
3362 block_child_signals (&prev_mask
);
3364 if (ptid_equal (ptid
, minus_one_ptid
))
3366 else if (ptid_is_pid (ptid
))
3367 /* A request to wait for a specific tgid. This is not possible
3368 with waitpid, so instead, we wait for any child, and leave
3369 children we're not interested in right now with a pending
3370 status to report later. */
3373 pid
= GET_LWP (ptid
);
3379 /* Make sure that of those LWPs we want to get an event from, there
3380 is at least one LWP that has been resumed. If there's none, just
3381 bail out. The core may just be flushing asynchronously all
3383 if (iterate_over_lwps (ptid
, resumed_callback
, NULL
) == NULL
)
3385 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3387 if (debug_linux_nat
)
3388 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (no resumed LWP)\n");
3390 restore_child_signals_mask (&prev_mask
);
3391 return minus_one_ptid
;
3394 /* First check if there is a LWP with a wait status pending. */
3397 /* Any LWP that's been resumed will do. */
3398 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3401 if (debug_linux_nat
&& lp
->status
)
3402 fprintf_unfiltered (gdb_stdlog
,
3403 "LLW: Using pending wait status %s for %s.\n",
3404 status_to_str (lp
->status
),
3405 target_pid_to_str (lp
->ptid
));
3408 /* But if we don't find one, we'll have to wait, and check both
3409 cloned and uncloned processes. We start with the cloned
3411 options
= __WCLONE
| WNOHANG
;
3413 else if (is_lwp (ptid
))
3415 if (debug_linux_nat
)
3416 fprintf_unfiltered (gdb_stdlog
,
3417 "LLW: Waiting for specific LWP %s.\n",
3418 target_pid_to_str (ptid
));
3420 /* We have a specific LWP to check. */
3421 lp
= find_lwp_pid (ptid
);
3424 if (debug_linux_nat
&& lp
->status
)
3425 fprintf_unfiltered (gdb_stdlog
,
3426 "LLW: Using pending wait status %s for %s.\n",
3427 status_to_str (lp
->status
),
3428 target_pid_to_str (lp
->ptid
));
3430 /* If we have to wait, take into account whether PID is a cloned
3431 process or not. And we have to convert it to something that
3432 the layer beneath us can understand. */
3433 options
= lp
->cloned
? __WCLONE
: 0;
3434 pid
= GET_LWP (ptid
);
3436 /* We check for lp->waitstatus in addition to lp->status,
3437 because we can have pending process exits recorded in
3438 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3439 an additional lp->status_p flag. */
3440 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3444 if (lp
&& lp
->signalled
&& lp
->last_resume_kind
!= resume_stop
)
3446 /* A pending SIGSTOP may interfere with the normal stream of
3447 events. In a typical case where interference is a problem,
3448 we have a SIGSTOP signal pending for LWP A while
3449 single-stepping it, encounter an event in LWP B, and take the
3450 pending SIGSTOP while trying to stop LWP A. After processing
3451 the event in LWP B, LWP A is continued, and we'll never see
3452 the SIGTRAP associated with the last time we were
3453 single-stepping LWP A. */
3455 /* Resume the thread. It should halt immediately returning the
3457 registers_changed ();
3458 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3459 lp
->step
, TARGET_SIGNAL_0
);
3460 if (debug_linux_nat
)
3461 fprintf_unfiltered (gdb_stdlog
,
3462 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3463 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3464 target_pid_to_str (lp
->ptid
));
3466 gdb_assert (lp
->resumed
);
3468 /* Catch the pending SIGSTOP. */
3469 status
= lp
->status
;
3472 stop_wait_callback (lp
, NULL
);
3474 /* If the lp->status field isn't empty, we caught another signal
3475 while flushing the SIGSTOP. Return it back to the event
3476 queue of the LWP, as we already have an event to handle. */
3479 if (debug_linux_nat
)
3480 fprintf_unfiltered (gdb_stdlog
,
3481 "LLW: kill %s, %s\n",
3482 target_pid_to_str (lp
->ptid
),
3483 status_to_str (lp
->status
));
3484 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3487 lp
->status
= status
;
3490 if (!target_can_async_p ())
3492 /* Causes SIGINT to be passed on to the attached process. */
3496 /* Translate generic target_wait options into waitpid options. */
3497 if (target_options
& TARGET_WNOHANG
)
3504 lwpid
= my_waitpid (pid
, &status
, options
);
3508 gdb_assert (pid
== -1 || lwpid
== pid
);
3510 if (debug_linux_nat
)
3512 fprintf_unfiltered (gdb_stdlog
,
3513 "LLW: waitpid %ld received %s\n",
3514 (long) lwpid
, status_to_str (status
));
3517 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3519 /* STATUS is now no longer valid, use LP->STATUS instead. */
3523 && ptid_is_pid (ptid
)
3524 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3526 gdb_assert (lp
->resumed
);
3528 if (debug_linux_nat
)
3530 "LWP %ld got an event %06x, leaving pending.\n",
3531 ptid_get_lwp (lp
->ptid
), lp
->status
);
3533 if (WIFSTOPPED (lp
->status
))
3535 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3537 /* Cancel breakpoint hits. The breakpoint may
3538 be removed before we fetch events from this
3539 process to report to the core. It is best
3540 not to assume the moribund breakpoints
3541 heuristic always handles these cases --- it
3542 could be too many events go through to the
3543 core before this one is handled. All-stop
3544 always cancels breakpoint hits in all
3547 && linux_nat_lp_status_is_event (lp
)
3548 && cancel_breakpoint (lp
))
3550 /* Throw away the SIGTRAP. */
3553 if (debug_linux_nat
)
3555 "LLW: LWP %ld hit a breakpoint while"
3556 " waiting for another process;"
3558 ptid_get_lwp (lp
->ptid
));
3568 else if (WIFEXITED (lp
->status
) || WIFSIGNALED (lp
->status
))
3570 if (debug_linux_nat
)
3572 "Process %ld exited while stopping LWPs\n",
3573 ptid_get_lwp (lp
->ptid
));
3575 /* This was the last lwp in the process. Since
3576 events are serialized to GDB core, and we can't
3577 report this one right now, but GDB core and the
3578 other target layers will want to be notified
3579 about the exit code/signal, leave the status
3580 pending for the next time we're able to report
3583 /* Prevent trying to stop this thread again. We'll
3584 never try to resume it because it has a pending
3588 /* Dead LWP's aren't expected to reported a pending
3592 /* Store the pending event in the waitstatus as
3593 well, because W_EXITCODE(0,0) == 0. */
3594 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3608 /* waitpid did return something. Restart over. */
3609 options
|= __WCLONE
;
3617 /* Alternate between checking cloned and uncloned processes. */
3618 options
^= __WCLONE
;
3620 /* And every time we have checked both:
3621 In async mode, return to event loop;
3622 In sync mode, suspend waiting for a SIGCHLD signal. */
3623 if (options
& __WCLONE
)
3625 if (target_options
& TARGET_WNOHANG
)
3627 /* No interesting event. */
3628 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3630 if (debug_linux_nat
)
3631 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3633 restore_child_signals_mask (&prev_mask
);
3634 return minus_one_ptid
;
3637 sigsuspend (&suspend_mask
);
3640 else if (target_options
& TARGET_WNOHANG
)
3642 /* No interesting event for PID yet. */
3643 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3645 if (debug_linux_nat
)
3646 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3648 restore_child_signals_mask (&prev_mask
);
3649 return minus_one_ptid
;
3652 /* We shouldn't end up here unless we want to try again. */
3653 gdb_assert (lp
== NULL
);
3656 if (!target_can_async_p ())
3657 clear_sigint_trap ();
3661 status
= lp
->status
;
3664 /* Don't report signals that GDB isn't interested in, such as
3665 signals that are neither printed nor stopped upon. Stopping all
3666 threads can be a bit time-consuming so if we want decent
3667 performance with heavily multi-threaded programs, especially when
3668 they're using a high frequency timer, we'd better avoid it if we
3671 if (WIFSTOPPED (status
))
3673 enum target_signal signo
= target_signal_from_host (WSTOPSIG (status
));
3675 /* When using hardware single-step, we need to report every signal.
3676 Otherwise, signals in pass_mask may be short-circuited. */
3678 && WSTOPSIG (status
) && sigismember (&pass_mask
, WSTOPSIG (status
)))
3680 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3681 here? It is not clear we should. GDB may not expect
3682 other threads to run. On the other hand, not resuming
3683 newly attached threads may cause an unwanted delay in
3684 getting them running. */
3685 registers_changed ();
3686 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3688 if (debug_linux_nat
)
3689 fprintf_unfiltered (gdb_stdlog
,
3690 "LLW: %s %s, %s (preempt 'handle')\n",
3692 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3693 target_pid_to_str (lp
->ptid
),
3694 (signo
!= TARGET_SIGNAL_0
3695 ? strsignal (target_signal_to_host (signo
))
3703 /* Only do the below in all-stop, as we currently use SIGINT
3704 to implement target_stop (see linux_nat_stop) in
3706 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3708 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3709 forwarded to the entire process group, that is, all LWPs
3710 will receive it - unless they're using CLONE_THREAD to
3711 share signals. Since we only want to report it once, we
3712 mark it as ignored for all LWPs except this one. */
3713 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3714 set_ignore_sigint
, NULL
);
3715 lp
->ignore_sigint
= 0;
3718 maybe_clear_ignore_sigint (lp
);
3722 /* This LWP is stopped now. */
3725 if (debug_linux_nat
)
3726 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3727 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3731 /* Now stop all other LWP's ... */
3732 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3734 /* ... and wait until all of them have reported back that
3735 they're no longer running. */
3736 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3738 /* If we're not waiting for a specific LWP, choose an event LWP
3739 from among those that have had events. Giving equal priority
3740 to all LWPs that have had events helps prevent
3743 select_event_lwp (ptid
, &lp
, &status
);
3745 /* Now that we've selected our final event LWP, cancel any
3746 breakpoints in other LWPs that have hit a GDB breakpoint.
3747 See the comment in cancel_breakpoints_callback to find out
3749 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3751 /* We'll need this to determine whether to report a SIGSTOP as
3752 TARGET_WAITKIND_0. Need to take a copy because
3753 resume_clear_callback clears it. */
3754 last_resume_kind
= lp
->last_resume_kind
;
3756 /* In all-stop, from the core's perspective, all LWPs are now
3757 stopped until a new resume action is sent over. */
3758 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
3763 last_resume_kind
= lp
->last_resume_kind
;
3764 resume_clear_callback (lp
, NULL
);
3767 if (linux_nat_status_is_event (status
))
3769 if (debug_linux_nat
)
3770 fprintf_unfiltered (gdb_stdlog
,
3771 "LLW: trap ptid is %s.\n",
3772 target_pid_to_str (lp
->ptid
));
3775 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3777 *ourstatus
= lp
->waitstatus
;
3778 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3781 store_waitstatus (ourstatus
, status
);
3783 if (debug_linux_nat
)
3784 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3786 restore_child_signals_mask (&prev_mask
);
3788 if (last_resume_kind
== resume_stop
3789 && ourstatus
->kind
== TARGET_WAITKIND_STOPPED
3790 && WSTOPSIG (status
) == SIGSTOP
)
3792 /* A thread that has been requested to stop by GDB with
3793 target_stop, and it stopped cleanly, so report as SIG0. The
3794 use of SIGSTOP is an implementation detail. */
3795 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
3798 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
3799 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
3802 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3807 /* Resume LWPs that are currently stopped without any pending status
3808 to report, but are resumed from the core's perspective. */
3811 resume_stopped_resumed_lwps (struct lwp_info
*lp
, void *data
)
3813 ptid_t
*wait_ptid_p
= data
;
3818 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3820 gdb_assert (is_executing (lp
->ptid
));
3822 /* Don't bother if there's a breakpoint at PC that we'd hit
3823 immediately, and we're not waiting for this LWP. */
3824 if (!ptid_match (lp
->ptid
, *wait_ptid_p
))
3826 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
3827 CORE_ADDR pc
= regcache_read_pc (regcache
);
3829 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3833 if (debug_linux_nat
)
3834 fprintf_unfiltered (gdb_stdlog
,
3835 "RSRL: resuming stopped-resumed LWP %s\n",
3836 target_pid_to_str (lp
->ptid
));
3838 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3839 lp
->step
, TARGET_SIGNAL_0
);
3841 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
3842 lp
->stopped_by_watchpoint
= 0;
3849 linux_nat_wait (struct target_ops
*ops
,
3850 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3855 if (debug_linux_nat
)
3856 fprintf_unfiltered (gdb_stdlog
,
3857 "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3859 /* Flush the async file first. */
3860 if (target_can_async_p ())
3861 async_file_flush ();
3863 /* Resume LWPs that are currently stopped without any pending status
3864 to report, but are resumed from the core's perspective. LWPs get
3865 in this state if we find them stopping at a time we're not
3866 interested in reporting the event (target_wait on a
3867 specific_process, for example, see linux_nat_wait_1), and
3868 meanwhile the event became uninteresting. Don't bother resuming
3869 LWPs we're not going to wait for if they'd stop immediately. */
3871 iterate_over_lwps (minus_one_ptid
, resume_stopped_resumed_lwps
, &ptid
);
3873 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3875 /* If we requested any event, and something came out, assume there
3876 may be more. If we requested a specific lwp or process, also
3877 assume there may be more. */
3878 if (target_can_async_p ()
3879 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3880 || !ptid_equal (ptid
, minus_one_ptid
)))
3883 /* Get ready for the next event. */
3884 if (target_can_async_p ())
3885 target_async (inferior_event_handler
, 0);
3891 kill_callback (struct lwp_info
*lp
, void *data
)
3893 /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */
3896 kill (GET_LWP (lp
->ptid
), SIGKILL
);
3897 if (debug_linux_nat
)
3898 fprintf_unfiltered (gdb_stdlog
,
3899 "KC: kill (SIGKILL) %s, 0, 0 (%s)\n",
3900 target_pid_to_str (lp
->ptid
),
3901 errno
? safe_strerror (errno
) : "OK");
3903 /* Some kernels ignore even SIGKILL for processes under ptrace. */
3906 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3907 if (debug_linux_nat
)
3908 fprintf_unfiltered (gdb_stdlog
,
3909 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3910 target_pid_to_str (lp
->ptid
),
3911 errno
? safe_strerror (errno
) : "OK");
3917 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3921 /* We must make sure that there are no pending events (delayed
3922 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3923 program doesn't interfere with any following debugging session. */
3925 /* For cloned processes we must check both with __WCLONE and
3926 without, since the exit status of a cloned process isn't reported
3932 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3933 if (pid
!= (pid_t
) -1)
3935 if (debug_linux_nat
)
3936 fprintf_unfiltered (gdb_stdlog
,
3937 "KWC: wait %s received unknown.\n",
3938 target_pid_to_str (lp
->ptid
));
3939 /* The Linux kernel sometimes fails to kill a thread
3940 completely after PTRACE_KILL; that goes from the stop
3941 point in do_fork out to the one in
3942 get_signal_to_deliever and waits again. So kill it
3944 kill_callback (lp
, NULL
);
3947 while (pid
== GET_LWP (lp
->ptid
));
3949 gdb_assert (pid
== -1 && errno
== ECHILD
);
3954 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3955 if (pid
!= (pid_t
) -1)
3957 if (debug_linux_nat
)
3958 fprintf_unfiltered (gdb_stdlog
,
3959 "KWC: wait %s received unk.\n",
3960 target_pid_to_str (lp
->ptid
));
3961 /* See the call to kill_callback above. */
3962 kill_callback (lp
, NULL
);
3965 while (pid
== GET_LWP (lp
->ptid
));
3967 gdb_assert (pid
== -1 && errno
== ECHILD
);
3972 linux_nat_kill (struct target_ops
*ops
)
3974 struct target_waitstatus last
;
3978 /* If we're stopped while forking and we haven't followed yet,
3979 kill the other task. We need to do this first because the
3980 parent will be sleeping if this is a vfork. */
3982 get_last_target_status (&last_ptid
, &last
);
3984 if (last
.kind
== TARGET_WAITKIND_FORKED
3985 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3987 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3991 if (forks_exist_p ())
3992 linux_fork_killall ();
3995 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3997 /* Stop all threads before killing them, since ptrace requires
3998 that the thread is stopped to sucessfully PTRACE_KILL. */
3999 iterate_over_lwps (ptid
, stop_callback
, NULL
);
4000 /* ... and wait until all of them have reported back that
4001 they're no longer running. */
4002 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
4004 /* Kill all LWP's ... */
4005 iterate_over_lwps (ptid
, kill_callback
, NULL
);
4007 /* ... and wait until we've flushed all events. */
4008 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
4011 target_mourn_inferior ();
4015 linux_nat_mourn_inferior (struct target_ops
*ops
)
4017 purge_lwp_list (ptid_get_pid (inferior_ptid
));
4019 if (! forks_exist_p ())
4020 /* Normal case, no other forks available. */
4021 linux_ops
->to_mourn_inferior (ops
);
4023 /* Multi-fork case. The current inferior_ptid has exited, but
4024 there are other viable forks to debug. Delete the exiting
4025 one and context-switch to the first available. */
4026 linux_fork_mourn_inferior ();
4029 /* Convert a native/host siginfo object, into/from the siginfo in the
4030 layout of the inferiors' architecture. */
4033 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
4037 if (linux_nat_siginfo_fixup
!= NULL
)
4038 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4040 /* If there was no callback, or the callback didn't do anything,
4041 then just do a straight memcpy. */
4045 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
4047 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
4052 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
4053 const char *annex
, gdb_byte
*readbuf
,
4054 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
4057 struct siginfo siginfo
;
4058 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
4060 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
4061 gdb_assert (readbuf
|| writebuf
);
4063 pid
= GET_LWP (inferior_ptid
);
4065 pid
= GET_PID (inferior_ptid
);
4067 if (offset
> sizeof (siginfo
))
4071 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
4075 /* When GDB is built as a 64-bit application, ptrace writes into
4076 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4077 inferior with a 64-bit GDB should look the same as debugging it
4078 with a 32-bit GDB, we need to convert it. GDB core always sees
4079 the converted layout, so any read/write will have to be done
4081 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4083 if (offset
+ len
> sizeof (siginfo
))
4084 len
= sizeof (siginfo
) - offset
;
4086 if (readbuf
!= NULL
)
4087 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
4090 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
4092 /* Convert back to ptrace layout before flushing it out. */
4093 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
4096 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
4105 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4106 const char *annex
, gdb_byte
*readbuf
,
4107 const gdb_byte
*writebuf
,
4108 ULONGEST offset
, LONGEST len
)
4110 struct cleanup
*old_chain
;
4113 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
4114 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
4117 /* The target is connected but no live inferior is selected. Pass
4118 this request down to a lower stratum (e.g., the executable
4120 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
4123 old_chain
= save_inferior_ptid ();
4125 if (is_lwp (inferior_ptid
))
4126 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
4128 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
4131 do_cleanups (old_chain
);
4136 linux_thread_alive (ptid_t ptid
)
4140 gdb_assert (is_lwp (ptid
));
4142 /* Send signal 0 instead of anything ptrace, because ptracing a
4143 running thread errors out claiming that the thread doesn't
4145 err
= kill_lwp (GET_LWP (ptid
), 0);
4147 if (debug_linux_nat
)
4148 fprintf_unfiltered (gdb_stdlog
,
4149 "LLTA: KILL(SIG0) %s (%s)\n",
4150 target_pid_to_str (ptid
),
4151 err
? safe_strerror (tmp_errno
) : "OK");
4160 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
4162 return linux_thread_alive (ptid
);
4166 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
4168 static char buf
[64];
4171 && (GET_PID (ptid
) != GET_LWP (ptid
)
4172 || num_lwps (GET_PID (ptid
)) > 1))
4174 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
4178 return normal_pid_to_str (ptid
);
4182 linux_nat_thread_name (struct thread_info
*thr
)
4184 int pid
= ptid_get_pid (thr
->ptid
);
4185 long lwp
= ptid_get_lwp (thr
->ptid
);
4186 #define FORMAT "/proc/%d/task/%ld/comm"
4187 char buf
[sizeof (FORMAT
) + 30];
4189 char *result
= NULL
;
4191 snprintf (buf
, sizeof (buf
), FORMAT
, pid
, lwp
);
4192 comm_file
= fopen (buf
, "r");
4195 /* Not exported by the kernel, so we define it here. */
4197 static char line
[COMM_LEN
+ 1];
4199 if (fgets (line
, sizeof (line
), comm_file
))
4201 char *nl
= strchr (line
, '\n');
4218 /* Accepts an integer PID; Returns a string representing a file that
4219 can be opened to get the symbols for the child process. */
4222 linux_child_pid_to_exec_file (int pid
)
4224 char *name1
, *name2
;
4226 name1
= xmalloc (MAXPATHLEN
);
4227 name2
= xmalloc (MAXPATHLEN
);
4228 make_cleanup (xfree
, name1
);
4229 make_cleanup (xfree
, name2
);
4230 memset (name2
, 0, MAXPATHLEN
);
4232 sprintf (name1
, "/proc/%d/exe", pid
);
4233 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
4239 /* Service function for corefiles and info proc. */
4242 read_mapping (FILE *mapfile
,
4247 char *device
, long long *inode
, char *filename
)
4249 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
4250 addr
, endaddr
, permissions
, offset
, device
, inode
);
4253 if (ret
> 0 && ret
!= EOF
)
4255 /* Eat everything up to EOL for the filename. This will prevent
4256 weird filenames (such as one with embedded whitespace) from
4257 confusing this code. It also makes this code more robust in
4258 respect to annotations the kernel may add after the filename.
4260 Note the filename is used for informational purposes
4262 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4265 return (ret
!= 0 && ret
!= EOF
);
4268 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4269 regions in the inferior for a corefile. */
4272 linux_nat_find_memory_regions (find_memory_region_ftype func
, void *obfd
)
4274 int pid
= PIDGET (inferior_ptid
);
4275 char mapsfilename
[MAXPATHLEN
];
4277 long long addr
, endaddr
, size
, offset
, inode
;
4278 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4279 int read
, write
, exec
;
4280 struct cleanup
*cleanup
;
4282 /* Compose the filename for the /proc memory map, and open it. */
4283 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4284 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4285 error (_("Could not open %s."), mapsfilename
);
4286 cleanup
= make_cleanup_fclose (mapsfile
);
4289 fprintf_filtered (gdb_stdout
,
4290 "Reading memory regions from %s\n", mapsfilename
);
4292 /* Now iterate until end-of-file. */
4293 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4294 &offset
, &device
[0], &inode
, &filename
[0]))
4296 size
= endaddr
- addr
;
4298 /* Get the segment's permissions. */
4299 read
= (strchr (permissions
, 'r') != 0);
4300 write
= (strchr (permissions
, 'w') != 0);
4301 exec
= (strchr (permissions
, 'x') != 0);
4305 fprintf_filtered (gdb_stdout
,
4306 "Save segment, %s bytes at %s (%c%c%c)",
4307 plongest (size
), paddress (target_gdbarch
, addr
),
4309 write
? 'w' : ' ', exec
? 'x' : ' ');
4311 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4312 fprintf_filtered (gdb_stdout
, "\n");
4315 /* Invoke the callback function to create the corefile
4317 func (addr
, size
, read
, write
, exec
, obfd
);
4319 do_cleanups (cleanup
);
4324 find_signalled_thread (struct thread_info
*info
, void *data
)
4326 if (info
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4327 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4333 static enum target_signal
4334 find_stop_signal (void)
4336 struct thread_info
*info
=
4337 iterate_over_threads (find_signalled_thread
, NULL
);
4340 return info
->suspend
.stop_signal
;
4342 return TARGET_SIGNAL_0
;
4345 /* Records the thread's register state for the corefile note
4349 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4350 char *note_data
, int *note_size
,
4351 enum target_signal stop_signal
)
4353 unsigned long lwp
= ptid_get_lwp (ptid
);
4354 struct gdbarch
*gdbarch
= target_gdbarch
;
4355 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4356 const struct regset
*regset
;
4358 struct cleanup
*old_chain
;
4359 struct core_regset_section
*sect_list
;
4362 old_chain
= save_inferior_ptid ();
4363 inferior_ptid
= ptid
;
4364 target_fetch_registers (regcache
, -1);
4365 do_cleanups (old_chain
);
4367 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4368 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4370 /* The loop below uses the new struct core_regset_section, which stores
4371 the supported section names and sizes for the core file. Note that
4372 note PRSTATUS needs to be treated specially. But the other notes are
4373 structurally the same, so they can benefit from the new struct. */
4374 if (core_regset_p
&& sect_list
!= NULL
)
4375 while (sect_list
->sect_name
!= NULL
)
4377 regset
= gdbarch_regset_from_core_section (gdbarch
,
4378 sect_list
->sect_name
,
4380 gdb_assert (regset
&& regset
->collect_regset
);
4381 gdb_regset
= xmalloc (sect_list
->size
);
4382 regset
->collect_regset (regset
, regcache
, -1,
4383 gdb_regset
, sect_list
->size
);
4385 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4386 note_data
= (char *) elfcore_write_prstatus
4387 (obfd
, note_data
, note_size
,
4388 lwp
, target_signal_to_host (stop_signal
),
4391 note_data
= (char *) elfcore_write_register_note
4392 (obfd
, note_data
, note_size
,
4393 sect_list
->sect_name
, gdb_regset
,
4399 /* For architectures that does not have the struct core_regset_section
4400 implemented, we use the old method. When all the architectures have
4401 the new support, the code below should be deleted. */
4404 gdb_gregset_t gregs
;
4405 gdb_fpregset_t fpregs
;
4408 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4410 != NULL
&& regset
->collect_regset
!= NULL
)
4411 regset
->collect_regset (regset
, regcache
, -1,
4412 &gregs
, sizeof (gregs
));
4414 fill_gregset (regcache
, &gregs
, -1);
4416 note_data
= (char *) elfcore_write_prstatus
4417 (obfd
, note_data
, note_size
, lwp
, target_signal_to_host (stop_signal
),
4421 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4423 != NULL
&& regset
->collect_regset
!= NULL
)
4424 regset
->collect_regset (regset
, regcache
, -1,
4425 &fpregs
, sizeof (fpregs
));
4427 fill_fpregset (regcache
, &fpregs
, -1);
4429 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4432 &fpregs
, sizeof (fpregs
));
4438 struct linux_nat_corefile_thread_data
4444 enum target_signal stop_signal
;
4447 /* Called by gdbthread.c once per thread. Records the thread's
4448 register state for the corefile note section. */
4451 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4453 struct linux_nat_corefile_thread_data
*args
= data
;
4455 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4465 /* Enumerate spufs IDs for process PID. */
4468 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4472 struct dirent
*entry
;
4474 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4475 dir
= opendir (path
);
4480 while ((entry
= readdir (dir
)) != NULL
)
4486 fd
= atoi (entry
->d_name
);
4490 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4491 if (stat (path
, &st
) != 0)
4493 if (!S_ISDIR (st
.st_mode
))
4496 if (statfs (path
, &stfs
) != 0)
4498 if (stfs
.f_type
!= SPUFS_MAGIC
)
4501 callback (data
, fd
);
4507 /* Generate corefile notes for SPU contexts. */
4509 struct linux_spu_corefile_data
4517 linux_spu_corefile_callback (void *data
, int fd
)
4519 struct linux_spu_corefile_data
*args
= data
;
4522 static const char *spu_files
[] =
4544 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4546 char annex
[32], note_name
[32];
4550 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4551 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4555 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4556 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4557 args
->note_size
, note_name
,
4558 NT_SPU
, spu_data
, spu_len
);
4565 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4567 struct linux_spu_corefile_data args
;
4570 args
.note_data
= note_data
;
4571 args
.note_size
= note_size
;
4573 iterate_over_spus (PIDGET (inferior_ptid
),
4574 linux_spu_corefile_callback
, &args
);
4576 return args
.note_data
;
4579 /* Fills the "to_make_corefile_note" target vector. Builds the note
4580 section for a corefile, and returns it in a malloc buffer. */
4583 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4585 struct linux_nat_corefile_thread_data thread_args
;
4586 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4587 char fname
[16] = { '\0' };
4588 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4589 char psargs
[80] = { '\0' };
4590 char *note_data
= NULL
;
4591 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4595 if (get_exec_file (0))
4597 strncpy (fname
, lbasename (get_exec_file (0)), sizeof (fname
));
4598 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4599 if (get_inferior_args ())
4602 char *psargs_end
= psargs
+ sizeof (psargs
);
4604 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4606 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4607 if (string_end
!= NULL
)
4609 *string_end
++ = ' ';
4610 strncpy (string_end
, get_inferior_args (),
4611 psargs_end
- string_end
);
4614 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4616 note_size
, fname
, psargs
);
4619 /* Dump information for threads. */
4620 thread_args
.obfd
= obfd
;
4621 thread_args
.note_data
= note_data
;
4622 thread_args
.note_size
= note_size
;
4623 thread_args
.num_notes
= 0;
4624 thread_args
.stop_signal
= find_stop_signal ();
4625 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4626 gdb_assert (thread_args
.num_notes
!= 0);
4627 note_data
= thread_args
.note_data
;
4629 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4633 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4634 "CORE", NT_AUXV
, auxv
, auxv_len
);
4638 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4640 make_cleanup (xfree
, note_data
);
4644 /* Implement the "info proc" command. */
4647 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4649 /* A long is used for pid instead of an int to avoid a loss of precision
4650 compiler warning from the output of strtoul. */
4651 long pid
= PIDGET (inferior_ptid
);
4654 char buffer
[MAXPATHLEN
];
4655 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4667 /* Break up 'args' into an argv array. */
4668 argv
= gdb_buildargv (args
);
4669 make_cleanup_freeargv (argv
);
4671 while (argv
!= NULL
&& *argv
!= NULL
)
4673 if (isdigit (argv
[0][0]))
4675 pid
= strtoul (argv
[0], NULL
, 10);
4677 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4681 else if (strcmp (argv
[0], "status") == 0)
4685 else if (strcmp (argv
[0], "stat") == 0)
4689 else if (strcmp (argv
[0], "cmd") == 0)
4693 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4697 else if (strcmp (argv
[0], "cwd") == 0)
4701 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4707 /* [...] (future options here). */
4712 error (_("No current process: you must name one."));
4714 sprintf (fname1
, "/proc/%ld", pid
);
4715 if (stat (fname1
, &dummy
) != 0)
4716 error (_("No /proc directory: '%s'"), fname1
);
4718 printf_filtered (_("process %ld\n"), pid
);
4719 if (cmdline_f
|| all
)
4721 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4722 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4724 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4726 if (fgets (buffer
, sizeof (buffer
), procfile
))
4727 printf_filtered ("cmdline = '%s'\n", buffer
);
4729 warning (_("unable to read '%s'"), fname1
);
4730 do_cleanups (cleanup
);
4733 warning (_("unable to open /proc file '%s'"), fname1
);
4737 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4738 memset (fname2
, 0, sizeof (fname2
));
4739 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4740 printf_filtered ("cwd = '%s'\n", fname2
);
4742 warning (_("unable to read link '%s'"), fname1
);
4746 sprintf (fname1
, "/proc/%ld/exe", pid
);
4747 memset (fname2
, 0, sizeof (fname2
));
4748 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4749 printf_filtered ("exe = '%s'\n", fname2
);
4751 warning (_("unable to read link '%s'"), fname1
);
4753 if (mappings_f
|| all
)
4755 sprintf (fname1
, "/proc/%ld/maps", pid
);
4756 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4758 long long addr
, endaddr
, size
, offset
, inode
;
4759 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4760 struct cleanup
*cleanup
;
4762 cleanup
= make_cleanup_fclose (procfile
);
4763 printf_filtered (_("Mapped address spaces:\n\n"));
4764 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4766 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4769 " Size", " Offset", "objfile");
4773 printf_filtered (" %18s %18s %10s %10s %7s\n",
4776 " Size", " Offset", "objfile");
4779 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4780 &offset
, &device
[0], &inode
, &filename
[0]))
4782 size
= endaddr
- addr
;
4784 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4785 calls here (and possibly above) should be abstracted
4786 out into their own functions? Andrew suggests using
4787 a generic local_address_string instead to print out
4788 the addresses; that makes sense to me, too. */
4790 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4792 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4793 (unsigned long) addr
, /* FIXME: pr_addr */
4794 (unsigned long) endaddr
,
4796 (unsigned int) offset
,
4797 filename
[0] ? filename
: "");
4801 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4802 (unsigned long) addr
, /* FIXME: pr_addr */
4803 (unsigned long) endaddr
,
4805 (unsigned int) offset
,
4806 filename
[0] ? filename
: "");
4810 do_cleanups (cleanup
);
4813 warning (_("unable to open /proc file '%s'"), fname1
);
4815 if (status_f
|| all
)
4817 sprintf (fname1
, "/proc/%ld/status", pid
);
4818 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4820 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4822 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4823 puts_filtered (buffer
);
4824 do_cleanups (cleanup
);
4827 warning (_("unable to open /proc file '%s'"), fname1
);
4831 sprintf (fname1
, "/proc/%ld/stat", pid
);
4832 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4837 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4839 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4840 printf_filtered (_("Process: %d\n"), itmp
);
4841 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4842 printf_filtered (_("Exec file: %s\n"), buffer
);
4843 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4844 printf_filtered (_("State: %c\n"), ctmp
);
4845 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4846 printf_filtered (_("Parent process: %d\n"), itmp
);
4847 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4848 printf_filtered (_("Process group: %d\n"), itmp
);
4849 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4850 printf_filtered (_("Session id: %d\n"), itmp
);
4851 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4852 printf_filtered (_("TTY: %d\n"), itmp
);
4853 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4854 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4855 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4856 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4857 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4858 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4859 (unsigned long) ltmp
);
4860 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4861 printf_filtered (_("Minor faults, children: %lu\n"),
4862 (unsigned long) ltmp
);
4863 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4864 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4865 (unsigned long) ltmp
);
4866 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4867 printf_filtered (_("Major faults, children: %lu\n"),
4868 (unsigned long) ltmp
);
4869 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4870 printf_filtered (_("utime: %ld\n"), ltmp
);
4871 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4872 printf_filtered (_("stime: %ld\n"), ltmp
);
4873 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4874 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4875 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4876 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4877 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4878 printf_filtered (_("jiffies remaining in current "
4879 "time slice: %ld\n"), ltmp
);
4880 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4881 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4882 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4883 printf_filtered (_("jiffies until next timeout: %lu\n"),
4884 (unsigned long) ltmp
);
4885 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4886 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4887 (unsigned long) ltmp
);
4888 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4889 printf_filtered (_("start time (jiffies since "
4890 "system boot): %ld\n"), ltmp
);
4891 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4892 printf_filtered (_("Virtual memory size: %lu\n"),
4893 (unsigned long) ltmp
);
4894 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4895 printf_filtered (_("Resident set size: %lu\n"),
4896 (unsigned long) ltmp
);
4897 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4898 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4899 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4900 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4901 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4902 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4903 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4904 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4905 #if 0 /* Don't know how architecture-dependent the rest is...
4906 Anyway the signal bitmap info is available from "status". */
4907 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4908 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4909 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4910 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4911 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4912 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4913 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4914 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4915 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4916 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4917 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4918 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4919 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4920 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4922 do_cleanups (cleanup
);
4925 warning (_("unable to open /proc file '%s'"), fname1
);
4929 /* Implement the to_xfer_partial interface for memory reads using the /proc
4930 filesystem. Because we can use a single read() call for /proc, this
4931 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4932 but it doesn't support writes. */
4935 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4936 const char *annex
, gdb_byte
*readbuf
,
4937 const gdb_byte
*writebuf
,
4938 ULONGEST offset
, LONGEST len
)
4944 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4947 /* Don't bother for one word. */
4948 if (len
< 3 * sizeof (long))
4951 /* We could keep this file open and cache it - possibly one per
4952 thread. That requires some juggling, but is even faster. */
4953 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4954 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4958 /* If pread64 is available, use it. It's faster if the kernel
4959 supports it (only one syscall), and it's 64-bit safe even on
4960 32-bit platforms (for instance, SPARC debugging a SPARC64
4963 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4965 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4976 /* Enumerate spufs IDs for process PID. */
4978 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4980 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4982 LONGEST written
= 0;
4985 struct dirent
*entry
;
4987 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4988 dir
= opendir (path
);
4993 while ((entry
= readdir (dir
)) != NULL
)
4999 fd
= atoi (entry
->d_name
);
5003 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
5004 if (stat (path
, &st
) != 0)
5006 if (!S_ISDIR (st
.st_mode
))
5009 if (statfs (path
, &stfs
) != 0)
5011 if (stfs
.f_type
!= SPUFS_MAGIC
)
5014 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5016 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
5026 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
5027 object type, using the /proc file system. */
5029 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
5030 const char *annex
, gdb_byte
*readbuf
,
5031 const gdb_byte
*writebuf
,
5032 ULONGEST offset
, LONGEST len
)
5037 int pid
= PIDGET (inferior_ptid
);
5044 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5047 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
5048 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5053 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5060 ret
= write (fd
, writebuf
, (size_t) len
);
5062 ret
= read (fd
, readbuf
, (size_t) len
);
5069 /* Parse LINE as a signal set and add its set bits to SIGS. */
5072 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
5074 int len
= strlen (line
) - 1;
5078 if (line
[len
] != '\n')
5079 error (_("Could not parse signal set: %s"), line
);
5087 if (*p
>= '0' && *p
<= '9')
5089 else if (*p
>= 'a' && *p
<= 'f')
5090 digit
= *p
- 'a' + 10;
5092 error (_("Could not parse signal set: %s"), line
);
5097 sigaddset (sigs
, signum
+ 1);
5099 sigaddset (sigs
, signum
+ 2);
5101 sigaddset (sigs
, signum
+ 3);
5103 sigaddset (sigs
, signum
+ 4);
5109 /* Find process PID's pending signals from /proc/pid/status and set
5113 linux_proc_pending_signals (int pid
, sigset_t
*pending
,
5114 sigset_t
*blocked
, sigset_t
*ignored
)
5117 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
5118 struct cleanup
*cleanup
;
5120 sigemptyset (pending
);
5121 sigemptyset (blocked
);
5122 sigemptyset (ignored
);
5123 sprintf (fname
, "/proc/%d/status", pid
);
5124 procfile
= fopen (fname
, "r");
5125 if (procfile
== NULL
)
5126 error (_("Could not open %s"), fname
);
5127 cleanup
= make_cleanup_fclose (procfile
);
5129 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
5131 /* Normal queued signals are on the SigPnd line in the status
5132 file. However, 2.6 kernels also have a "shared" pending
5133 queue for delivering signals to a thread group, so check for
5136 Unfortunately some Red Hat kernels include the shared pending
5137 queue but not the ShdPnd status field. */
5139 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
5140 add_line_to_sigset (buffer
+ 8, pending
);
5141 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
5142 add_line_to_sigset (buffer
+ 8, pending
);
5143 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
5144 add_line_to_sigset (buffer
+ 8, blocked
);
5145 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
5146 add_line_to_sigset (buffer
+ 8, ignored
);
5149 do_cleanups (cleanup
);
5153 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
5154 const char *annex
, gdb_byte
*readbuf
,
5155 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5157 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
5159 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5163 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5164 const char *annex
, gdb_byte
*readbuf
,
5165 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5169 if (object
== TARGET_OBJECT_AUXV
)
5170 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5173 if (object
== TARGET_OBJECT_OSDATA
)
5174 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5177 if (object
== TARGET_OBJECT_SPU
)
5178 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5181 /* GDB calculates all the addresses in possibly larget width of the address.
5182 Address width needs to be masked before its final use - either by
5183 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5185 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5187 if (object
== TARGET_OBJECT_MEMORY
)
5189 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5191 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5192 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5195 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5200 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5204 /* Create a prototype generic GNU/Linux target. The client can override
5205 it with local methods. */
5208 linux_target_install_ops (struct target_ops
*t
)
5210 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5211 t
->to_remove_fork_catchpoint
= linux_child_remove_fork_catchpoint
;
5212 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5213 t
->to_remove_vfork_catchpoint
= linux_child_remove_vfork_catchpoint
;
5214 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5215 t
->to_remove_exec_catchpoint
= linux_child_remove_exec_catchpoint
;
5216 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5217 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5218 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5219 t
->to_post_attach
= linux_child_post_attach
;
5220 t
->to_follow_fork
= linux_child_follow_fork
;
5221 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5222 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5224 super_xfer_partial
= t
->to_xfer_partial
;
5225 t
->to_xfer_partial
= linux_xfer_partial
;
5231 struct target_ops
*t
;
5233 t
= inf_ptrace_target ();
5234 linux_target_install_ops (t
);
5240 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5242 struct target_ops
*t
;
5244 t
= inf_ptrace_trad_target (register_u_offset
);
5245 linux_target_install_ops (t
);
5250 /* target_is_async_p implementation. */
5253 linux_nat_is_async_p (void)
5255 /* NOTE: palves 2008-03-21: We're only async when the user requests
5256 it explicitly with the "set target-async" command.
5257 Someday, linux will always be async. */
5258 return target_async_permitted
;
5261 /* target_can_async_p implementation. */
5264 linux_nat_can_async_p (void)
5266 /* NOTE: palves 2008-03-21: We're only async when the user requests
5267 it explicitly with the "set target-async" command.
5268 Someday, linux will always be async. */
5269 return target_async_permitted
;
5273 linux_nat_supports_non_stop (void)
5278 /* True if we want to support multi-process. To be removed when GDB
5279 supports multi-exec. */
5281 int linux_multi_process
= 1;
5284 linux_nat_supports_multi_process (void)
5286 return linux_multi_process
;
5290 linux_nat_supports_disable_randomization (void)
5292 #ifdef HAVE_PERSONALITY
5299 static int async_terminal_is_ours
= 1;
5301 /* target_terminal_inferior implementation. */
5304 linux_nat_terminal_inferior (void)
5306 if (!target_is_async_p ())
5308 /* Async mode is disabled. */
5309 terminal_inferior ();
5313 terminal_inferior ();
5315 /* Calls to target_terminal_*() are meant to be idempotent. */
5316 if (!async_terminal_is_ours
)
5319 delete_file_handler (input_fd
);
5320 async_terminal_is_ours
= 0;
5324 /* target_terminal_ours implementation. */
5327 linux_nat_terminal_ours (void)
5329 if (!target_is_async_p ())
5331 /* Async mode is disabled. */
5336 /* GDB should never give the terminal to the inferior if the
5337 inferior is running in the background (run&, continue&, etc.),
5338 but claiming it sure should. */
5341 if (async_terminal_is_ours
)
5344 clear_sigint_trap ();
5345 add_file_handler (input_fd
, stdin_event_handler
, 0);
5346 async_terminal_is_ours
= 1;
5349 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5351 static void *async_client_context
;
5353 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5354 so we notice when any child changes state, and notify the
5355 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5356 above to wait for the arrival of a SIGCHLD. */
5359 sigchld_handler (int signo
)
5361 int old_errno
= errno
;
5363 if (debug_linux_nat
)
5364 ui_file_write_async_safe (gdb_stdlog
,
5365 "sigchld\n", sizeof ("sigchld\n") - 1);
5367 if (signo
== SIGCHLD
5368 && linux_nat_event_pipe
[0] != -1)
5369 async_file_mark (); /* Let the event loop know that there are
5370 events to handle. */
5375 /* Callback registered with the target events file descriptor. */
5378 handle_target_event (int error
, gdb_client_data client_data
)
5380 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5383 /* Create/destroy the target events pipe. Returns previous state. */
5386 linux_async_pipe (int enable
)
5388 int previous
= (linux_nat_event_pipe
[0] != -1);
5390 if (previous
!= enable
)
5394 block_child_signals (&prev_mask
);
5398 if (pipe (linux_nat_event_pipe
) == -1)
5399 internal_error (__FILE__
, __LINE__
,
5400 "creating event pipe failed.");
5402 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5403 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5407 close (linux_nat_event_pipe
[0]);
5408 close (linux_nat_event_pipe
[1]);
5409 linux_nat_event_pipe
[0] = -1;
5410 linux_nat_event_pipe
[1] = -1;
5413 restore_child_signals_mask (&prev_mask
);
5419 /* target_async implementation. */
5422 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5423 void *context
), void *context
)
5425 if (callback
!= NULL
)
5427 async_client_callback
= callback
;
5428 async_client_context
= context
;
5429 if (!linux_async_pipe (1))
5431 add_file_handler (linux_nat_event_pipe
[0],
5432 handle_target_event
, NULL
);
5433 /* There may be pending events to handle. Tell the event loop
5440 async_client_callback
= callback
;
5441 async_client_context
= context
;
5442 delete_file_handler (linux_nat_event_pipe
[0]);
5443 linux_async_pipe (0);
5448 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5452 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5456 ptid_t ptid
= lwp
->ptid
;
5458 if (debug_linux_nat
)
5459 fprintf_unfiltered (gdb_stdlog
,
5460 "LNSL: running -> suspending %s\n",
5461 target_pid_to_str (lwp
->ptid
));
5464 if (lwp
->last_resume_kind
== resume_stop
)
5466 if (debug_linux_nat
)
5467 fprintf_unfiltered (gdb_stdlog
,
5468 "linux-nat: already stopping LWP %ld at "
5470 ptid_get_lwp (lwp
->ptid
));
5474 stop_callback (lwp
, NULL
);
5475 lwp
->last_resume_kind
= resume_stop
;
5479 /* Already known to be stopped; do nothing. */
5481 if (debug_linux_nat
)
5483 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5484 fprintf_unfiltered (gdb_stdlog
,
5485 "LNSL: already stopped/stop_requested %s\n",
5486 target_pid_to_str (lwp
->ptid
));
5488 fprintf_unfiltered (gdb_stdlog
,
5489 "LNSL: already stopped/no "
5490 "stop_requested yet %s\n",
5491 target_pid_to_str (lwp
->ptid
));
5498 linux_nat_stop (ptid_t ptid
)
5501 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5503 linux_ops
->to_stop (ptid
);
5507 linux_nat_close (int quitting
)
5509 /* Unregister from the event loop. */
5510 if (target_is_async_p ())
5511 target_async (NULL
, 0);
5513 if (linux_ops
->to_close
)
5514 linux_ops
->to_close (quitting
);
5517 /* When requests are passed down from the linux-nat layer to the
5518 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5519 used. The address space pointer is stored in the inferior object,
5520 but the common code that is passed such ptid can't tell whether
5521 lwpid is a "main" process id or not (it assumes so). We reverse
5522 look up the "main" process id from the lwp here. */
5524 struct address_space
*
5525 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5527 struct lwp_info
*lwp
;
5528 struct inferior
*inf
;
5531 pid
= GET_LWP (ptid
);
5532 if (GET_LWP (ptid
) == 0)
5534 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5536 lwp
= find_lwp_pid (ptid
);
5537 pid
= GET_PID (lwp
->ptid
);
5541 /* A (pid,lwpid,0) ptid. */
5542 pid
= GET_PID (ptid
);
5545 inf
= find_inferior_pid (pid
);
5546 gdb_assert (inf
!= NULL
);
5551 linux_nat_core_of_thread_1 (ptid_t ptid
)
5553 struct cleanup
*back_to
;
5556 char *content
= NULL
;
5559 int content_read
= 0;
5563 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5564 GET_PID (ptid
), GET_LWP (ptid
));
5565 back_to
= make_cleanup (xfree
, filename
);
5567 f
= fopen (filename
, "r");
5570 do_cleanups (back_to
);
5574 make_cleanup_fclose (f
);
5580 content
= xrealloc (content
, content_read
+ 1024);
5581 n
= fread (content
+ content_read
, 1, 1024, f
);
5585 content
[content_read
] = '\0';
5590 make_cleanup (xfree
, content
);
5592 p
= strchr (content
, '(');
5596 p
= strchr (p
, ')');
5600 /* If the first field after program name has index 0, then core number is
5601 the field with index 36. There's no constant for that anywhere. */
5603 p
= strtok_r (p
, " ", &ts
);
5604 for (i
= 0; p
!= NULL
&& i
!= 36; ++i
)
5605 p
= strtok_r (NULL
, " ", &ts
);
5607 if (p
== NULL
|| sscanf (p
, "%d", &core
) == 0)
5610 do_cleanups (back_to
);
5615 /* Return the cached value of the processor core for thread PTID. */
5618 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5620 struct lwp_info
*info
= find_lwp_pid (ptid
);
5628 linux_nat_add_target (struct target_ops
*t
)
5630 /* Save the provided single-threaded target. We save this in a separate
5631 variable because another target we've inherited from (e.g. inf-ptrace)
5632 may have saved a pointer to T; we want to use it for the final
5633 process stratum target. */
5634 linux_ops_saved
= *t
;
5635 linux_ops
= &linux_ops_saved
;
5637 /* Override some methods for multithreading. */
5638 t
->to_create_inferior
= linux_nat_create_inferior
;
5639 t
->to_attach
= linux_nat_attach
;
5640 t
->to_detach
= linux_nat_detach
;
5641 t
->to_resume
= linux_nat_resume
;
5642 t
->to_wait
= linux_nat_wait
;
5643 t
->to_pass_signals
= linux_nat_pass_signals
;
5644 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5645 t
->to_kill
= linux_nat_kill
;
5646 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5647 t
->to_thread_alive
= linux_nat_thread_alive
;
5648 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5649 t
->to_thread_name
= linux_nat_thread_name
;
5650 t
->to_has_thread_control
= tc_schedlock
;
5651 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5652 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5653 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5655 t
->to_can_async_p
= linux_nat_can_async_p
;
5656 t
->to_is_async_p
= linux_nat_is_async_p
;
5657 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5658 t
->to_async
= linux_nat_async
;
5659 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5660 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5661 t
->to_close
= linux_nat_close
;
5663 /* Methods for non-stop support. */
5664 t
->to_stop
= linux_nat_stop
;
5666 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5668 t
->to_supports_disable_randomization
5669 = linux_nat_supports_disable_randomization
;
5671 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5673 /* We don't change the stratum; this target will sit at
5674 process_stratum and thread_db will set at thread_stratum. This
5675 is a little strange, since this is a multi-threaded-capable
5676 target, but we want to be on the stack below thread_db, and we
5677 also want to be used for single-threaded processes. */
5682 /* Register a method to call whenever a new thread is attached. */
5684 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5686 /* Save the pointer. We only support a single registered instance
5687 of the GNU/Linux native target, so we do not need to map this to
5689 linux_nat_new_thread
= new_thread
;
5692 /* Register a method that converts a siginfo object between the layout
5693 that ptrace returns, and the layout in the architecture of the
5696 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5697 int (*siginfo_fixup
) (struct siginfo
*,
5701 /* Save the pointer. */
5702 linux_nat_siginfo_fixup
= siginfo_fixup
;
5705 /* Return the saved siginfo associated with PTID. */
5707 linux_nat_get_siginfo (ptid_t ptid
)
5709 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5711 gdb_assert (lp
!= NULL
);
5713 return &lp
->siginfo
;
5716 /* Provide a prototype to silence -Wmissing-prototypes. */
5717 extern initialize_file_ftype _initialize_linux_nat
;
5720 _initialize_linux_nat (void)
5722 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5723 Show /proc process information about any running process.\n\
5724 Specify any process id, or use the program being debugged by default.\n\
5725 Specify any of the following keywords for detailed info:\n\
5726 mappings -- list of mapped memory regions.\n\
5727 stat -- list a bunch of random process info.\n\
5728 status -- list a different bunch of random process info.\n\
5729 all -- list all available /proc info."));
5731 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5732 &debug_linux_nat
, _("\
5733 Set debugging of GNU/Linux lwp module."), _("\
5734 Show debugging of GNU/Linux lwp module."), _("\
5735 Enables printf debugging output."),
5737 show_debug_linux_nat
,
5738 &setdebuglist
, &showdebuglist
);
5740 /* Save this mask as the default. */
5741 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5743 /* Install a SIGCHLD handler. */
5744 sigchld_action
.sa_handler
= sigchld_handler
;
5745 sigemptyset (&sigchld_action
.sa_mask
);
5746 sigchld_action
.sa_flags
= SA_RESTART
;
5748 /* Make it the default. */
5749 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5751 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5752 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5753 sigdelset (&suspend_mask
, SIGCHLD
);
5755 sigemptyset (&blocked_mask
);
5759 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5760 the GNU/Linux Threads library and therefore doesn't really belong
5763 /* Read variable NAME in the target and return its value if found.
5764 Otherwise return zero. It is assumed that the type of the variable
5768 get_signo (const char *name
)
5770 struct minimal_symbol
*ms
;
5773 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5777 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5778 sizeof (signo
)) != 0)
5784 /* Return the set of signals used by the threads library in *SET. */
5787 lin_thread_get_thread_signals (sigset_t
*set
)
5789 struct sigaction action
;
5790 int restart
, cancel
;
5792 sigemptyset (&blocked_mask
);
5795 restart
= get_signo ("__pthread_sig_restart");
5796 cancel
= get_signo ("__pthread_sig_cancel");
5798 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5799 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5800 not provide any way for the debugger to query the signal numbers -
5801 fortunately they don't change! */
5804 restart
= __SIGRTMIN
;
5807 cancel
= __SIGRTMIN
+ 1;
5809 sigaddset (set
, restart
);
5810 sigaddset (set
, cancel
);
5812 /* The GNU/Linux Threads library makes terminating threads send a
5813 special "cancel" signal instead of SIGCHLD. Make sure we catch
5814 those (to prevent them from terminating GDB itself, which is
5815 likely to be their default action) and treat them the same way as
5818 action
.sa_handler
= sigchld_handler
;
5819 sigemptyset (&action
.sa_mask
);
5820 action
.sa_flags
= SA_RESTART
;
5821 sigaction (cancel
, &action
, NULL
);
5823 /* We block the "cancel" signal throughout this code ... */
5824 sigaddset (&blocked_mask
, cancel
);
5825 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5827 /* ... except during a sigsuspend. */
5828 sigdelset (&suspend_mask
, cancel
);