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-fork.h"
35 #include "gdbthread.h"
39 #include "inf-ptrace.h"
41 #include <sys/param.h> /* for MAXPATHLEN */
42 #include <sys/procfs.h> /* for elf_gregset etc. */
43 #include "elf-bfd.h" /* for elfcore_write_* */
44 #include "gregset.h" /* for gregset */
45 #include "gdbcore.h" /* for get_exec_file */
46 #include <ctype.h> /* for isdigit */
47 #include "gdbthread.h" /* for struct thread_info etc. */
48 #include "gdb_stat.h" /* for struct stat */
49 #include <fcntl.h> /* for O_RDONLY */
51 #include "event-loop.h"
52 #include "event-top.h"
54 #include <sys/types.h>
55 #include "gdb_dirent.h"
56 #include "xml-support.h"
62 #define SPUFS_MAGIC 0x23c9b64e
65 #ifdef HAVE_PERSONALITY
66 # include <sys/personality.h>
67 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
68 # define ADDR_NO_RANDOMIZE 0x0040000
70 #endif /* HAVE_PERSONALITY */
72 /* This comment documents high-level logic of this file.
74 Waiting for events in sync mode
75 ===============================
77 When waiting for an event in a specific thread, we just use waitpid, passing
78 the specific pid, and not passing WNOHANG.
80 When waiting for an event in all threads, waitpid is not quite good. Prior to
81 version 2.4, Linux can either wait for event in main thread, or in secondary
82 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
83 miss an event. The solution is to use non-blocking waitpid, together with
84 sigsuspend. First, we use non-blocking waitpid to get an event in the main
85 process, if any. Second, we use non-blocking waitpid with the __WCLONED
86 flag to check for events in cloned processes. If nothing is found, we use
87 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
88 happened to a child process -- and SIGCHLD will be delivered both for events
89 in main debugged process and in cloned processes. As soon as we know there's
90 an event, we get back to calling nonblocking waitpid with and without
93 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
94 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
95 blocked, the signal becomes pending and sigsuspend immediately
96 notices it and returns.
98 Waiting for events in async mode
99 ================================
101 In async mode, GDB should always be ready to handle both user input
102 and target events, so neither blocking waitpid nor sigsuspend are
103 viable options. Instead, we should asynchronously notify the GDB main
104 event loop whenever there's an unprocessed event from the target. We
105 detect asynchronous target events by handling SIGCHLD signals. To
106 notify the event loop about target events, the self-pipe trick is used
107 --- a pipe is registered as waitable event source in the event loop,
108 the event loop select/poll's on the read end of this pipe (as well on
109 other event sources, e.g., stdin), and the SIGCHLD handler writes a
110 byte to this pipe. This is more portable than relying on
111 pselect/ppoll, since on kernels that lack those syscalls, libc
112 emulates them with select/poll+sigprocmask, and that is racy
113 (a.k.a. plain broken).
115 Obviously, if we fail to notify the event loop if there's a target
116 event, it's bad. OTOH, if we notify the event loop when there's no
117 event from the target, linux_nat_wait will detect that there's no real
118 event to report, and return event of type TARGET_WAITKIND_IGNORE.
119 This is mostly harmless, but it will waste time and is better avoided.
121 The main design point is that every time GDB is outside linux-nat.c,
122 we have a SIGCHLD handler installed that is called when something
123 happens to the target and notifies the GDB event loop. Whenever GDB
124 core decides to handle the event, and calls into linux-nat.c, we
125 process things as in sync mode, except that the we never block in
128 While processing an event, we may end up momentarily blocked in
129 waitpid calls. Those waitpid calls, while blocking, are guarantied to
130 return quickly. E.g., in all-stop mode, before reporting to the core
131 that an LWP hit a breakpoint, all LWPs are stopped by sending them
132 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
133 Note that this is different from blocking indefinitely waiting for the
134 next event --- here, we're already handling an event.
139 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
140 signal is not entirely significant; we just need for a signal to be delivered,
141 so that we can intercept it. SIGSTOP's advantage is that it can not be
142 blocked. A disadvantage is that it is not a real-time signal, so it can only
143 be queued once; we do not keep track of other sources of SIGSTOP.
145 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
146 use them, because they have special behavior when the signal is generated -
147 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
148 kills the entire thread group.
150 A delivered SIGSTOP would stop the entire thread group, not just the thread we
151 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
152 cancel it (by PTRACE_CONT without passing SIGSTOP).
154 We could use a real-time signal instead. This would solve those problems; we
155 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
156 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
157 generates it, and there are races with trying to find a signal that is not
161 #define O_LARGEFILE 0
164 /* Unlike other extended result codes, WSTOPSIG (status) on
165 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
166 instead SIGTRAP with bit 7 set. */
167 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
169 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
170 the use of the multi-threaded target. */
171 static struct target_ops
*linux_ops
;
172 static struct target_ops linux_ops_saved
;
174 /* The method to call, if any, when a new thread is attached. */
175 static void (*linux_nat_new_thread
) (ptid_t
);
177 /* The method to call, if any, when the siginfo object needs to be
178 converted between the layout returned by ptrace, and the layout in
179 the architecture of the inferior. */
180 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
184 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
185 Called by our to_xfer_partial. */
186 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
188 const char *, gdb_byte
*,
192 static int debug_linux_nat
;
194 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
195 struct cmd_list_element
*c
, const char *value
)
197 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
201 static int debug_linux_nat_async
= 0;
203 show_debug_linux_nat_async (struct ui_file
*file
, int from_tty
,
204 struct cmd_list_element
*c
, const char *value
)
206 fprintf_filtered (file
,
207 _("Debugging of GNU/Linux async lwp module is %s.\n"),
211 static int disable_randomization
= 1;
214 show_disable_randomization (struct ui_file
*file
, int from_tty
,
215 struct cmd_list_element
*c
, const char *value
)
217 #ifdef HAVE_PERSONALITY
218 fprintf_filtered (file
,
219 _("Disabling randomization of debuggee's "
220 "virtual address space is %s.\n"),
222 #else /* !HAVE_PERSONALITY */
223 fputs_filtered (_("Disabling randomization of debuggee's "
224 "virtual address space is unsupported on\n"
225 "this platform.\n"), file
);
226 #endif /* !HAVE_PERSONALITY */
230 set_disable_randomization (char *args
, int from_tty
,
231 struct cmd_list_element
*c
)
233 #ifndef HAVE_PERSONALITY
234 error (_("Disabling randomization of debuggee's "
235 "virtual address space is unsupported on\n"
237 #endif /* !HAVE_PERSONALITY */
240 struct simple_pid_list
244 struct simple_pid_list
*next
;
246 struct simple_pid_list
*stopped_pids
;
248 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
249 can not be used, 1 if it can. */
251 static int linux_supports_tracefork_flag
= -1;
253 /* This variable is a tri-state flag: -1 for unknown, 0 if
254 PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */
256 static int linux_supports_tracesysgood_flag
= -1;
258 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
259 PTRACE_O_TRACEVFORKDONE. */
261 static int linux_supports_tracevforkdone_flag
= -1;
263 /* Async mode support. */
265 /* Zero if the async mode, although enabled, is masked, which means
266 linux_nat_wait should behave as if async mode was off. */
267 static int linux_nat_async_mask_value
= 1;
269 /* Stores the current used ptrace() options. */
270 static int current_ptrace_options
= 0;
272 /* The read/write ends of the pipe registered as waitable file in the
274 static int linux_nat_event_pipe
[2] = { -1, -1 };
276 /* Flush the event pipe. */
279 async_file_flush (void)
286 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
288 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
291 /* Put something (anything, doesn't matter what, or how much) in event
292 pipe, so that the select/poll in the event-loop realizes we have
293 something to process. */
296 async_file_mark (void)
300 /* It doesn't really matter what the pipe contains, as long we end
301 up with something in it. Might as well flush the previous
307 ret
= write (linux_nat_event_pipe
[1], "+", 1);
309 while (ret
== -1 && errno
== EINTR
);
311 /* Ignore EAGAIN. If the pipe is full, the event loop will already
312 be awakened anyway. */
315 static void linux_nat_async (void (*callback
)
316 (enum inferior_event_type event_type
,
319 static int linux_nat_async_mask (int mask
);
320 static int kill_lwp (int lwpid
, int signo
);
322 static int stop_callback (struct lwp_info
*lp
, void *data
);
324 static void block_child_signals (sigset_t
*prev_mask
);
325 static void restore_child_signals_mask (sigset_t
*prev_mask
);
328 static struct lwp_info
*add_lwp (ptid_t ptid
);
329 static void purge_lwp_list (int pid
);
330 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
333 /* Trivial list manipulation functions to keep track of a list of
334 new stopped processes. */
336 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
338 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
341 new_pid
->status
= status
;
342 new_pid
->next
= *listp
;
347 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
349 struct simple_pid_list
**p
;
351 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
352 if ((*p
)->pid
== pid
)
354 struct simple_pid_list
*next
= (*p
)->next
;
356 *statusp
= (*p
)->status
;
365 linux_record_stopped_pid (int pid
, int status
)
367 add_to_pid_list (&stopped_pids
, pid
, status
);
371 /* A helper function for linux_test_for_tracefork, called after fork (). */
374 linux_tracefork_child (void)
376 ptrace (PTRACE_TRACEME
, 0, 0, 0);
377 kill (getpid (), SIGSTOP
);
382 /* Wrapper function for waitpid which handles EINTR. */
385 my_waitpid (int pid
, int *statusp
, int flags
)
391 ret
= waitpid (pid
, statusp
, flags
);
393 while (ret
== -1 && errno
== EINTR
);
398 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
400 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
401 we know that the feature is not available. This may change the tracing
402 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
404 However, if it succeeds, we don't know for sure that the feature is
405 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
406 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
407 fork tracing, and let it fork. If the process exits, we assume that we
408 can't use TRACEFORK; if we get the fork notification, and we can extract
409 the new child's PID, then we assume that we can. */
412 linux_test_for_tracefork (int original_pid
)
414 int child_pid
, ret
, status
;
418 /* We don't want those ptrace calls to be interrupted. */
419 block_child_signals (&prev_mask
);
421 linux_supports_tracefork_flag
= 0;
422 linux_supports_tracevforkdone_flag
= 0;
424 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
427 restore_child_signals_mask (&prev_mask
);
433 perror_with_name (("fork"));
436 linux_tracefork_child ();
438 ret
= my_waitpid (child_pid
, &status
, 0);
440 perror_with_name (("waitpid"));
441 else if (ret
!= child_pid
)
442 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
443 if (! WIFSTOPPED (status
))
444 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."),
447 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
450 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
453 warning (_("linux_test_for_tracefork: failed to kill child"));
454 restore_child_signals_mask (&prev_mask
);
458 ret
= my_waitpid (child_pid
, &status
, 0);
459 if (ret
!= child_pid
)
460 warning (_("linux_test_for_tracefork: failed "
461 "to wait for killed child"));
462 else if (!WIFSIGNALED (status
))
463 warning (_("linux_test_for_tracefork: unexpected "
464 "wait status 0x%x from killed child"), status
);
466 restore_child_signals_mask (&prev_mask
);
470 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
471 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
472 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
473 linux_supports_tracevforkdone_flag
= (ret
== 0);
475 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
477 warning (_("linux_test_for_tracefork: failed to resume child"));
479 ret
= my_waitpid (child_pid
, &status
, 0);
481 if (ret
== child_pid
&& WIFSTOPPED (status
)
482 && status
>> 16 == PTRACE_EVENT_FORK
)
485 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
486 if (ret
== 0 && second_pid
!= 0)
490 linux_supports_tracefork_flag
= 1;
491 my_waitpid (second_pid
, &second_status
, 0);
492 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
494 warning (_("linux_test_for_tracefork: "
495 "failed to kill second child"));
496 my_waitpid (second_pid
, &status
, 0);
500 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
501 "(%d, status 0x%x)"), ret
, status
);
503 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
505 warning (_("linux_test_for_tracefork: failed to kill child"));
506 my_waitpid (child_pid
, &status
, 0);
508 restore_child_signals_mask (&prev_mask
);
511 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
513 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
514 we know that the feature is not available. This may change the tracing
515 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
518 linux_test_for_tracesysgood (int original_pid
)
523 /* We don't want those ptrace calls to be interrupted. */
524 block_child_signals (&prev_mask
);
526 linux_supports_tracesysgood_flag
= 0;
528 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
532 linux_supports_tracesysgood_flag
= 1;
534 restore_child_signals_mask (&prev_mask
);
537 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
538 This function also sets linux_supports_tracesysgood_flag. */
541 linux_supports_tracesysgood (int pid
)
543 if (linux_supports_tracesysgood_flag
== -1)
544 linux_test_for_tracesysgood (pid
);
545 return linux_supports_tracesysgood_flag
;
548 /* Return non-zero iff we have tracefork functionality available.
549 This function also sets linux_supports_tracefork_flag. */
552 linux_supports_tracefork (int pid
)
554 if (linux_supports_tracefork_flag
== -1)
555 linux_test_for_tracefork (pid
);
556 return linux_supports_tracefork_flag
;
560 linux_supports_tracevforkdone (int pid
)
562 if (linux_supports_tracefork_flag
== -1)
563 linux_test_for_tracefork (pid
);
564 return linux_supports_tracevforkdone_flag
;
568 linux_enable_tracesysgood (ptid_t ptid
)
570 int pid
= ptid_get_lwp (ptid
);
573 pid
= ptid_get_pid (ptid
);
575 if (linux_supports_tracesysgood (pid
) == 0)
578 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
580 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
585 linux_enable_event_reporting (ptid_t ptid
)
587 int pid
= ptid_get_lwp (ptid
);
590 pid
= ptid_get_pid (ptid
);
592 if (! linux_supports_tracefork (pid
))
595 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
596 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
598 if (linux_supports_tracevforkdone (pid
))
599 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
601 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
602 read-only process state. */
604 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
608 linux_child_post_attach (int pid
)
610 linux_enable_event_reporting (pid_to_ptid (pid
));
611 check_for_thread_db ();
612 linux_enable_tracesysgood (pid_to_ptid (pid
));
616 linux_child_post_startup_inferior (ptid_t ptid
)
618 linux_enable_event_reporting (ptid
);
619 check_for_thread_db ();
620 linux_enable_tracesysgood (ptid
);
624 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
628 int parent_pid
, child_pid
;
630 block_child_signals (&prev_mask
);
632 has_vforked
= (inferior_thread ()->pending_follow
.kind
633 == TARGET_WAITKIND_VFORKED
);
634 parent_pid
= ptid_get_lwp (inferior_ptid
);
636 parent_pid
= ptid_get_pid (inferior_ptid
);
637 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
640 linux_enable_event_reporting (pid_to_ptid (child_pid
));
643 && !non_stop
/* Non-stop always resumes both branches. */
644 && (!target_is_async_p () || sync_execution
)
645 && !(follow_child
|| detach_fork
|| sched_multi
))
647 /* The parent stays blocked inside the vfork syscall until the
648 child execs or exits. If we don't let the child run, then
649 the parent stays blocked. If we're telling the parent to run
650 in the foreground, the user will not be able to ctrl-c to get
651 back the terminal, effectively hanging the debug session. */
652 fprintf_filtered (gdb_stderr
, _("\
653 Can not resume the parent process over vfork in the foreground while\n\
654 holding the child stopped. Try \"set detach-on-fork\" or \
655 \"set schedule-multiple\".\n"));
656 /* FIXME output string > 80 columns. */
662 struct lwp_info
*child_lp
= NULL
;
664 /* We're already attached to the parent, by default. */
666 /* Detach new forked process? */
669 /* Before detaching from the child, remove all breakpoints
670 from it. If we forked, then this has already been taken
671 care of by infrun.c. If we vforked however, any
672 breakpoint inserted in the parent is visible in the
673 child, even those added while stopped in a vfork
674 catchpoint. This will remove the breakpoints from the
675 parent also, but they'll be reinserted below. */
678 /* keep breakpoints list in sync. */
679 remove_breakpoints_pid (GET_PID (inferior_ptid
));
682 if (info_verbose
|| debug_linux_nat
)
684 target_terminal_ours ();
685 fprintf_filtered (gdb_stdlog
,
686 "Detaching after fork from "
687 "child process %d.\n",
691 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
695 struct inferior
*parent_inf
, *child_inf
;
696 struct cleanup
*old_chain
;
698 /* Add process to GDB's tables. */
699 child_inf
= add_inferior (child_pid
);
701 parent_inf
= current_inferior ();
702 child_inf
->attach_flag
= parent_inf
->attach_flag
;
703 copy_terminal_info (child_inf
, parent_inf
);
705 old_chain
= save_inferior_ptid ();
706 save_current_program_space ();
708 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
709 add_thread (inferior_ptid
);
710 child_lp
= add_lwp (inferior_ptid
);
711 child_lp
->stopped
= 1;
712 child_lp
->resumed
= 1;
714 /* If this is a vfork child, then the address-space is
715 shared with the parent. */
718 child_inf
->pspace
= parent_inf
->pspace
;
719 child_inf
->aspace
= parent_inf
->aspace
;
721 /* The parent will be frozen until the child is done
722 with the shared region. Keep track of the
724 child_inf
->vfork_parent
= parent_inf
;
725 child_inf
->pending_detach
= 0;
726 parent_inf
->vfork_child
= child_inf
;
727 parent_inf
->pending_detach
= 0;
731 child_inf
->aspace
= new_address_space ();
732 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
733 child_inf
->removable
= 1;
734 set_current_program_space (child_inf
->pspace
);
735 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
737 /* Let the shared library layer (solib-svr4) learn about
738 this new process, relocate the cloned exec, pull in
739 shared libraries, and install the solib event
740 breakpoint. If a "cloned-VM" event was propagated
741 better throughout the core, this wouldn't be
743 solib_create_inferior_hook (0);
746 /* Let the thread_db layer learn about this new process. */
747 check_for_thread_db ();
749 do_cleanups (old_chain
);
755 struct inferior
*parent_inf
;
757 parent_inf
= current_inferior ();
759 /* If we detached from the child, then we have to be careful
760 to not insert breakpoints in the parent until the child
761 is done with the shared memory region. However, if we're
762 staying attached to the child, then we can and should
763 insert breakpoints, so that we can debug it. A
764 subsequent child exec or exit is enough to know when does
765 the child stops using the parent's address space. */
766 parent_inf
->waiting_for_vfork_done
= detach_fork
;
767 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
769 lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
770 gdb_assert (linux_supports_tracefork_flag
>= 0);
771 if (linux_supports_tracevforkdone (0))
774 fprintf_unfiltered (gdb_stdlog
,
775 "LCFF: waiting for VFORK_DONE on %d\n",
781 /* We'll handle the VFORK_DONE event like any other
782 event, in target_wait. */
786 /* We can't insert breakpoints until the child has
787 finished with the shared memory region. We need to
788 wait until that happens. Ideal would be to just
790 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
791 - waitpid (parent_pid, &status, __WALL);
792 However, most architectures can't handle a syscall
793 being traced on the way out if it wasn't traced on
796 We might also think to loop, continuing the child
797 until it exits or gets a SIGTRAP. One problem is
798 that the child might call ptrace with PTRACE_TRACEME.
800 There's no simple and reliable way to figure out when
801 the vforked child will be done with its copy of the
802 shared memory. We could step it out of the syscall,
803 two instructions, let it go, and then single-step the
804 parent once. When we have hardware single-step, this
805 would work; with software single-step it could still
806 be made to work but we'd have to be able to insert
807 single-step breakpoints in the child, and we'd have
808 to insert -just- the single-step breakpoint in the
809 parent. Very awkward.
811 In the end, the best we can do is to make sure it
812 runs for a little while. Hopefully it will be out of
813 range of any breakpoints we reinsert. Usually this
814 is only the single-step breakpoint at vfork's return
818 fprintf_unfiltered (gdb_stdlog
,
819 "LCFF: no VFORK_DONE "
820 "support, sleeping a bit\n");
824 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
825 and leave it pending. The next linux_nat_resume call
826 will notice a pending event, and bypasses actually
827 resuming the inferior. */
829 lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
833 /* If we're in async mode, need to tell the event loop
834 there's something here to process. */
835 if (target_can_async_p ())
842 struct inferior
*parent_inf
, *child_inf
;
844 struct program_space
*parent_pspace
;
846 if (info_verbose
|| debug_linux_nat
)
848 target_terminal_ours ();
850 fprintf_filtered (gdb_stdlog
,
851 _("Attaching after process %d "
852 "vfork to child process %d.\n"),
853 parent_pid
, child_pid
);
855 fprintf_filtered (gdb_stdlog
,
856 _("Attaching after process %d "
857 "fork to child process %d.\n"),
858 parent_pid
, child_pid
);
861 /* Add the new inferior first, so that the target_detach below
862 doesn't unpush the target. */
864 child_inf
= add_inferior (child_pid
);
866 parent_inf
= current_inferior ();
867 child_inf
->attach_flag
= parent_inf
->attach_flag
;
868 copy_terminal_info (child_inf
, parent_inf
);
870 parent_pspace
= parent_inf
->pspace
;
872 /* If we're vforking, we want to hold on to the parent until the
873 child exits or execs. At child exec or exit time we can
874 remove the old breakpoints from the parent and detach or
875 resume debugging it. Otherwise, detach the parent now; we'll
876 want to reuse it's program/address spaces, but we can't set
877 them to the child before removing breakpoints from the
878 parent, otherwise, the breakpoints module could decide to
879 remove breakpoints from the wrong process (since they'd be
880 assigned to the same address space). */
884 gdb_assert (child_inf
->vfork_parent
== NULL
);
885 gdb_assert (parent_inf
->vfork_child
== NULL
);
886 child_inf
->vfork_parent
= parent_inf
;
887 child_inf
->pending_detach
= 0;
888 parent_inf
->vfork_child
= child_inf
;
889 parent_inf
->pending_detach
= detach_fork
;
890 parent_inf
->waiting_for_vfork_done
= 0;
892 else if (detach_fork
)
893 target_detach (NULL
, 0);
895 /* Note that the detach above makes PARENT_INF dangling. */
897 /* Add the child thread to the appropriate lists, and switch to
898 this new thread, before cloning the program space, and
899 informing the solib layer about this new process. */
901 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
902 add_thread (inferior_ptid
);
903 lp
= add_lwp (inferior_ptid
);
907 /* If this is a vfork child, then the address-space is shared
908 with the parent. If we detached from the parent, then we can
909 reuse the parent's program/address spaces. */
910 if (has_vforked
|| detach_fork
)
912 child_inf
->pspace
= parent_pspace
;
913 child_inf
->aspace
= child_inf
->pspace
->aspace
;
917 child_inf
->aspace
= new_address_space ();
918 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
919 child_inf
->removable
= 1;
920 set_current_program_space (child_inf
->pspace
);
921 clone_program_space (child_inf
->pspace
, parent_pspace
);
923 /* Let the shared library layer (solib-svr4) learn about
924 this new process, relocate the cloned exec, pull in
925 shared libraries, and install the solib event breakpoint.
926 If a "cloned-VM" event was propagated better throughout
927 the core, this wouldn't be required. */
928 solib_create_inferior_hook (0);
931 /* Let the thread_db layer learn about this new process. */
932 check_for_thread_db ();
935 restore_child_signals_mask (&prev_mask
);
941 linux_child_insert_fork_catchpoint (int pid
)
943 return !linux_supports_tracefork (pid
);
947 linux_child_remove_fork_catchpoint (int pid
)
953 linux_child_insert_vfork_catchpoint (int pid
)
955 return !linux_supports_tracefork (pid
);
959 linux_child_remove_vfork_catchpoint (int pid
)
965 linux_child_insert_exec_catchpoint (int pid
)
967 return !linux_supports_tracefork (pid
);
971 linux_child_remove_exec_catchpoint (int pid
)
977 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
978 int table_size
, int *table
)
980 if (!linux_supports_tracesysgood (pid
))
983 /* On GNU/Linux, we ignore the arguments. It means that we only
984 enable the syscall catchpoints, but do not disable them.
986 Also, we do not use the `table' information because we do not
987 filter system calls here. We let GDB do the logic for us. */
991 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
992 are processes sharing the same VM space. A multi-threaded process
993 is basically a group of such processes. However, such a grouping
994 is almost entirely a user-space issue; the kernel doesn't enforce
995 such a grouping at all (this might change in the future). In
996 general, we'll rely on the threads library (i.e. the GNU/Linux
997 Threads library) to provide such a grouping.
999 It is perfectly well possible to write a multi-threaded application
1000 without the assistance of a threads library, by using the clone
1001 system call directly. This module should be able to give some
1002 rudimentary support for debugging such applications if developers
1003 specify the CLONE_PTRACE flag in the clone system call, and are
1004 using the Linux kernel 2.4 or above.
1006 Note that there are some peculiarities in GNU/Linux that affect
1009 - In general one should specify the __WCLONE flag to waitpid in
1010 order to make it report events for any of the cloned processes
1011 (and leave it out for the initial process). However, if a cloned
1012 process has exited the exit status is only reported if the
1013 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
1014 we cannot use it since GDB must work on older systems too.
1016 - When a traced, cloned process exits and is waited for by the
1017 debugger, the kernel reassigns it to the original parent and
1018 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1019 library doesn't notice this, which leads to the "zombie problem":
1020 When debugged a multi-threaded process that spawns a lot of
1021 threads will run out of processes, even if the threads exit,
1022 because the "zombies" stay around. */
1024 /* List of known LWPs. */
1025 struct lwp_info
*lwp_list
;
1028 /* Original signal mask. */
1029 static sigset_t normal_mask
;
1031 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1032 _initialize_linux_nat. */
1033 static sigset_t suspend_mask
;
1035 /* Signals to block to make that sigsuspend work. */
1036 static sigset_t blocked_mask
;
1038 /* SIGCHLD action. */
1039 struct sigaction sigchld_action
;
1041 /* Block child signals (SIGCHLD and linux threads signals), and store
1042 the previous mask in PREV_MASK. */
1045 block_child_signals (sigset_t
*prev_mask
)
1047 /* Make sure SIGCHLD is blocked. */
1048 if (!sigismember (&blocked_mask
, SIGCHLD
))
1049 sigaddset (&blocked_mask
, SIGCHLD
);
1051 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1054 /* Restore child signals mask, previously returned by
1055 block_child_signals. */
1058 restore_child_signals_mask (sigset_t
*prev_mask
)
1060 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1063 /* Mask of signals to pass directly to the inferior. */
1064 static sigset_t pass_mask
;
1066 /* Update signals to pass to the inferior. */
1068 linux_nat_pass_signals (int numsigs
, unsigned char *pass_signals
)
1072 sigemptyset (&pass_mask
);
1074 for (signo
= 1; signo
< NSIG
; signo
++)
1076 int target_signo
= target_signal_from_host (signo
);
1077 if (target_signo
< numsigs
&& pass_signals
[target_signo
])
1078 sigaddset (&pass_mask
, signo
);
1084 /* Prototypes for local functions. */
1085 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1086 static int linux_thread_alive (ptid_t ptid
);
1087 static char *linux_child_pid_to_exec_file (int pid
);
1090 /* Convert wait status STATUS to a string. Used for printing debug
1094 status_to_str (int status
)
1096 static char buf
[64];
1098 if (WIFSTOPPED (status
))
1100 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1101 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1102 strsignal (SIGTRAP
));
1104 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1105 strsignal (WSTOPSIG (status
)));
1107 else if (WIFSIGNALED (status
))
1108 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1109 strsignal (WTERMSIG (status
)));
1111 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1116 /* Remove all LWPs belong to PID from the lwp list. */
1119 purge_lwp_list (int pid
)
1121 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1125 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1129 if (ptid_get_pid (lp
->ptid
) == pid
)
1132 lwp_list
= lp
->next
;
1134 lpprev
->next
= lp
->next
;
1143 /* Return the number of known LWPs in the tgid given by PID. */
1149 struct lwp_info
*lp
;
1151 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1152 if (ptid_get_pid (lp
->ptid
) == pid
)
1158 /* Add the LWP specified by PID to the list. Return a pointer to the
1159 structure describing the new LWP. The LWP should already be stopped
1160 (with an exception for the very first LWP). */
1162 static struct lwp_info
*
1163 add_lwp (ptid_t ptid
)
1165 struct lwp_info
*lp
;
1167 gdb_assert (is_lwp (ptid
));
1169 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1171 memset (lp
, 0, sizeof (struct lwp_info
));
1173 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1178 lp
->next
= lwp_list
;
1181 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1182 linux_nat_new_thread (ptid
);
1187 /* Remove the LWP specified by PID from the list. */
1190 delete_lwp (ptid_t ptid
)
1192 struct lwp_info
*lp
, *lpprev
;
1196 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1197 if (ptid_equal (lp
->ptid
, ptid
))
1204 lpprev
->next
= lp
->next
;
1206 lwp_list
= lp
->next
;
1211 /* Return a pointer to the structure describing the LWP corresponding
1212 to PID. If no corresponding LWP could be found, return NULL. */
1214 static struct lwp_info
*
1215 find_lwp_pid (ptid_t ptid
)
1217 struct lwp_info
*lp
;
1221 lwp
= GET_LWP (ptid
);
1223 lwp
= GET_PID (ptid
);
1225 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1226 if (lwp
== GET_LWP (lp
->ptid
))
1232 /* Call CALLBACK with its second argument set to DATA for every LWP in
1233 the list. If CALLBACK returns 1 for a particular LWP, return a
1234 pointer to the structure describing that LWP immediately.
1235 Otherwise return NULL. */
1238 iterate_over_lwps (ptid_t filter
,
1239 int (*callback
) (struct lwp_info
*, void *),
1242 struct lwp_info
*lp
, *lpnext
;
1244 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1248 if (ptid_match (lp
->ptid
, filter
))
1250 if ((*callback
) (lp
, data
))
1258 /* Update our internal state when changing from one checkpoint to
1259 another indicated by NEW_PTID. We can only switch single-threaded
1260 applications, so we only create one new LWP, and the previous list
1264 linux_nat_switch_fork (ptid_t new_ptid
)
1266 struct lwp_info
*lp
;
1268 purge_lwp_list (GET_PID (inferior_ptid
));
1270 lp
= add_lwp (new_ptid
);
1273 /* This changes the thread's ptid while preserving the gdb thread
1274 num. Also changes the inferior pid, while preserving the
1276 thread_change_ptid (inferior_ptid
, new_ptid
);
1278 /* We've just told GDB core that the thread changed target id, but,
1279 in fact, it really is a different thread, with different register
1281 registers_changed ();
1284 /* Handle the exit of a single thread LP. */
1287 exit_lwp (struct lwp_info
*lp
)
1289 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1293 if (print_thread_events
)
1294 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1296 delete_thread (lp
->ptid
);
1299 delete_lwp (lp
->ptid
);
1302 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1305 linux_proc_get_tgid (int lwpid
)
1311 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1312 status_file
= fopen (buf
, "r");
1313 if (status_file
!= NULL
)
1315 while (fgets (buf
, sizeof (buf
), status_file
))
1317 if (strncmp (buf
, "Tgid:", 5) == 0)
1319 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1324 fclose (status_file
);
1330 /* Detect `T (stopped)' in `/proc/PID/status'.
1331 Other states including `T (tracing stop)' are reported as false. */
1334 pid_is_stopped (pid_t pid
)
1340 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1341 status_file
= fopen (buf
, "r");
1342 if (status_file
!= NULL
)
1346 while (fgets (buf
, sizeof (buf
), status_file
))
1348 if (strncmp (buf
, "State:", 6) == 0)
1354 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1356 fclose (status_file
);
1361 /* Wait for the LWP specified by LP, which we have just attached to.
1362 Returns a wait status for that LWP, to cache. */
1365 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1368 pid_t new_pid
, pid
= GET_LWP (ptid
);
1371 if (pid_is_stopped (pid
))
1373 if (debug_linux_nat
)
1374 fprintf_unfiltered (gdb_stdlog
,
1375 "LNPAW: Attaching to a stopped process\n");
1377 /* The process is definitely stopped. It is in a job control
1378 stop, unless the kernel predates the TASK_STOPPED /
1379 TASK_TRACED distinction, in which case it might be in a
1380 ptrace stop. Make sure it is in a ptrace stop; from there we
1381 can kill it, signal it, et cetera.
1383 First make sure there is a pending SIGSTOP. Since we are
1384 already attached, the process can not transition from stopped
1385 to running without a PTRACE_CONT; so we know this signal will
1386 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1387 probably already in the queue (unless this kernel is old
1388 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1389 is not an RT signal, it can only be queued once. */
1390 kill_lwp (pid
, SIGSTOP
);
1392 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1393 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1394 ptrace (PTRACE_CONT
, pid
, 0, 0);
1397 /* Make sure the initial process is stopped. The user-level threads
1398 layer might want to poke around in the inferior, and that won't
1399 work if things haven't stabilized yet. */
1400 new_pid
= my_waitpid (pid
, &status
, 0);
1401 if (new_pid
== -1 && errno
== ECHILD
)
1404 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1406 /* Try again with __WCLONE to check cloned processes. */
1407 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1411 gdb_assert (pid
== new_pid
);
1413 if (!WIFSTOPPED (status
))
1415 /* The pid we tried to attach has apparently just exited. */
1416 if (debug_linux_nat
)
1417 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1418 pid
, status_to_str (status
));
1422 if (WSTOPSIG (status
) != SIGSTOP
)
1425 if (debug_linux_nat
)
1426 fprintf_unfiltered (gdb_stdlog
,
1427 "LNPAW: Received %s after attaching\n",
1428 status_to_str (status
));
1434 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1435 if the new LWP could not be attached. */
1438 lin_lwp_attach_lwp (ptid_t ptid
)
1440 struct lwp_info
*lp
;
1443 gdb_assert (is_lwp (ptid
));
1445 block_child_signals (&prev_mask
);
1447 lp
= find_lwp_pid (ptid
);
1449 /* We assume that we're already attached to any LWP that has an id
1450 equal to the overall process id, and to any LWP that is already
1451 in our list of LWPs. If we're not seeing exit events from threads
1452 and we've had PID wraparound since we last tried to stop all threads,
1453 this assumption might be wrong; fortunately, this is very unlikely
1455 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1457 int status
, cloned
= 0, signalled
= 0;
1459 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1461 /* If we fail to attach to the thread, issue a warning,
1462 but continue. One way this can happen is if thread
1463 creation is interrupted; as of Linux kernel 2.6.19, a
1464 bug may place threads in the thread list and then fail
1466 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1467 safe_strerror (errno
));
1468 restore_child_signals_mask (&prev_mask
);
1472 if (debug_linux_nat
)
1473 fprintf_unfiltered (gdb_stdlog
,
1474 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1475 target_pid_to_str (ptid
));
1477 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1478 if (!WIFSTOPPED (status
))
1481 lp
= add_lwp (ptid
);
1483 lp
->cloned
= cloned
;
1484 lp
->signalled
= signalled
;
1485 if (WSTOPSIG (status
) != SIGSTOP
)
1488 lp
->status
= status
;
1491 target_post_attach (GET_LWP (lp
->ptid
));
1493 if (debug_linux_nat
)
1495 fprintf_unfiltered (gdb_stdlog
,
1496 "LLAL: waitpid %s received %s\n",
1497 target_pid_to_str (ptid
),
1498 status_to_str (status
));
1503 /* We assume that the LWP representing the original process is
1504 already stopped. Mark it as stopped in the data structure
1505 that the GNU/linux ptrace layer uses to keep track of
1506 threads. Note that this won't have already been done since
1507 the main thread will have, we assume, been stopped by an
1508 attach from a different layer. */
1510 lp
= add_lwp (ptid
);
1514 restore_child_signals_mask (&prev_mask
);
1519 linux_nat_create_inferior (struct target_ops
*ops
,
1520 char *exec_file
, char *allargs
, char **env
,
1523 #ifdef HAVE_PERSONALITY
1524 int personality_orig
= 0, personality_set
= 0;
1525 #endif /* HAVE_PERSONALITY */
1527 /* The fork_child mechanism is synchronous and calls target_wait, so
1528 we have to mask the async mode. */
1530 #ifdef HAVE_PERSONALITY
1531 if (disable_randomization
)
1534 personality_orig
= personality (0xffffffff);
1535 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1537 personality_set
= 1;
1538 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1540 if (errno
!= 0 || (personality_set
1541 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1542 warning (_("Error disabling address space randomization: %s"),
1543 safe_strerror (errno
));
1545 #endif /* HAVE_PERSONALITY */
1547 /* Make sure we report all signals during startup. */
1548 linux_nat_pass_signals (0, NULL
);
1550 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1552 #ifdef HAVE_PERSONALITY
1553 if (personality_set
)
1556 personality (personality_orig
);
1558 warning (_("Error restoring address space randomization: %s"),
1559 safe_strerror (errno
));
1561 #endif /* HAVE_PERSONALITY */
1565 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1567 struct lwp_info
*lp
;
1571 /* Make sure we report all signals during attach. */
1572 linux_nat_pass_signals (0, NULL
);
1574 linux_ops
->to_attach (ops
, args
, from_tty
);
1576 /* The ptrace base target adds the main thread with (pid,0,0)
1577 format. Decorate it with lwp info. */
1578 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1579 thread_change_ptid (inferior_ptid
, ptid
);
1581 /* Add the initial process as the first LWP to the list. */
1582 lp
= add_lwp (ptid
);
1584 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1586 if (!WIFSTOPPED (status
))
1588 if (WIFEXITED (status
))
1590 int exit_code
= WEXITSTATUS (status
);
1592 target_terminal_ours ();
1593 target_mourn_inferior ();
1595 error (_("Unable to attach: program exited normally."));
1597 error (_("Unable to attach: program exited with code %d."),
1600 else if (WIFSIGNALED (status
))
1602 enum target_signal signo
;
1604 target_terminal_ours ();
1605 target_mourn_inferior ();
1607 signo
= target_signal_from_host (WTERMSIG (status
));
1608 error (_("Unable to attach: program terminated with signal "
1610 target_signal_to_name (signo
),
1611 target_signal_to_string (signo
));
1614 internal_error (__FILE__
, __LINE__
,
1615 _("unexpected status %d for PID %ld"),
1616 status
, (long) GET_LWP (ptid
));
1621 /* Save the wait status to report later. */
1623 if (debug_linux_nat
)
1624 fprintf_unfiltered (gdb_stdlog
,
1625 "LNA: waitpid %ld, saving status %s\n",
1626 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1628 lp
->status
= status
;
1630 if (target_can_async_p ())
1631 target_async (inferior_event_handler
, 0);
1634 /* Get pending status of LP. */
1636 get_pending_status (struct lwp_info
*lp
, int *status
)
1638 enum target_signal signo
= TARGET_SIGNAL_0
;
1640 /* If we paused threads momentarily, we may have stored pending
1641 events in lp->status or lp->waitstatus (see stop_wait_callback),
1642 and GDB core hasn't seen any signal for those threads.
1643 Otherwise, the last signal reported to the core is found in the
1644 thread object's stop_signal.
1646 There's a corner case that isn't handled here at present. Only
1647 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1648 stop_signal make sense as a real signal to pass to the inferior.
1649 Some catchpoint related events, like
1650 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1651 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1652 those traps are debug API (ptrace in our case) related and
1653 induced; the inferior wouldn't see them if it wasn't being
1654 traced. Hence, we should never pass them to the inferior, even
1655 when set to pass state. Since this corner case isn't handled by
1656 infrun.c when proceeding with a signal, for consistency, neither
1657 do we handle it here (or elsewhere in the file we check for
1658 signal pass state). Normally SIGTRAP isn't set to pass state, so
1659 this is really a corner case. */
1661 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1662 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1663 else if (lp
->status
)
1664 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1665 else if (non_stop
&& !is_executing (lp
->ptid
))
1667 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1669 signo
= tp
->suspend
.stop_signal
;
1673 struct target_waitstatus last
;
1676 get_last_target_status (&last_ptid
, &last
);
1678 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1680 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1682 signo
= tp
->suspend
.stop_signal
;
1688 if (signo
== TARGET_SIGNAL_0
)
1690 if (debug_linux_nat
)
1691 fprintf_unfiltered (gdb_stdlog
,
1692 "GPT: lwp %s has no pending signal\n",
1693 target_pid_to_str (lp
->ptid
));
1695 else if (!signal_pass_state (signo
))
1697 if (debug_linux_nat
)
1698 fprintf_unfiltered (gdb_stdlog
,
1699 "GPT: lwp %s had signal %s, "
1700 "but it is in no pass state\n",
1701 target_pid_to_str (lp
->ptid
),
1702 target_signal_to_string (signo
));
1706 *status
= W_STOPCODE (target_signal_to_host (signo
));
1708 if (debug_linux_nat
)
1709 fprintf_unfiltered (gdb_stdlog
,
1710 "GPT: lwp %s has pending signal %s\n",
1711 target_pid_to_str (lp
->ptid
),
1712 target_signal_to_string (signo
));
1719 detach_callback (struct lwp_info
*lp
, void *data
)
1721 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1723 if (debug_linux_nat
&& lp
->status
)
1724 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1725 strsignal (WSTOPSIG (lp
->status
)),
1726 target_pid_to_str (lp
->ptid
));
1728 /* If there is a pending SIGSTOP, get rid of it. */
1731 if (debug_linux_nat
)
1732 fprintf_unfiltered (gdb_stdlog
,
1733 "DC: Sending SIGCONT to %s\n",
1734 target_pid_to_str (lp
->ptid
));
1736 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1740 /* We don't actually detach from the LWP that has an id equal to the
1741 overall process id just yet. */
1742 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1746 /* Pass on any pending signal for this LWP. */
1747 get_pending_status (lp
, &status
);
1750 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1751 WSTOPSIG (status
)) < 0)
1752 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1753 safe_strerror (errno
));
1755 if (debug_linux_nat
)
1756 fprintf_unfiltered (gdb_stdlog
,
1757 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1758 target_pid_to_str (lp
->ptid
),
1759 strsignal (WSTOPSIG (status
)));
1761 delete_lwp (lp
->ptid
);
1768 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1772 struct lwp_info
*main_lwp
;
1774 pid
= GET_PID (inferior_ptid
);
1776 if (target_can_async_p ())
1777 linux_nat_async (NULL
, 0);
1779 /* Stop all threads before detaching. ptrace requires that the
1780 thread is stopped to sucessfully detach. */
1781 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1782 /* ... and wait until all of them have reported back that
1783 they're no longer running. */
1784 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1786 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1788 /* Only the initial process should be left right now. */
1789 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1791 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1793 /* Pass on any pending signal for the last LWP. */
1794 if ((args
== NULL
|| *args
== '\0')
1795 && get_pending_status (main_lwp
, &status
) != -1
1796 && WIFSTOPPED (status
))
1798 /* Put the signal number in ARGS so that inf_ptrace_detach will
1799 pass it along with PTRACE_DETACH. */
1801 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1802 if (debug_linux_nat
)
1803 fprintf_unfiltered (gdb_stdlog
,
1804 "LND: Sending signal %s to %s\n",
1806 target_pid_to_str (main_lwp
->ptid
));
1809 delete_lwp (main_lwp
->ptid
);
1811 if (forks_exist_p ())
1813 /* Multi-fork case. The current inferior_ptid is being detached
1814 from, but there are other viable forks to debug. Detach from
1815 the current fork, and context-switch to the first
1817 linux_fork_detach (args
, from_tty
);
1819 if (non_stop
&& target_can_async_p ())
1820 target_async (inferior_event_handler
, 0);
1823 linux_ops
->to_detach (ops
, args
, from_tty
);
1829 resume_callback (struct lwp_info
*lp
, void *data
)
1831 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1833 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1835 if (debug_linux_nat
)
1836 fprintf_unfiltered (gdb_stdlog
,
1837 "RC: Not resuming %s (vfork parent)\n",
1838 target_pid_to_str (lp
->ptid
));
1840 else if (lp
->stopped
&& lp
->status
== 0)
1842 if (debug_linux_nat
)
1843 fprintf_unfiltered (gdb_stdlog
,
1844 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1845 target_pid_to_str (lp
->ptid
));
1847 linux_ops
->to_resume (linux_ops
,
1848 pid_to_ptid (GET_LWP (lp
->ptid
)),
1849 0, TARGET_SIGNAL_0
);
1850 if (debug_linux_nat
)
1851 fprintf_unfiltered (gdb_stdlog
,
1852 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1853 target_pid_to_str (lp
->ptid
));
1856 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1857 lp
->stopped_by_watchpoint
= 0;
1859 else if (lp
->stopped
&& debug_linux_nat
)
1860 fprintf_unfiltered (gdb_stdlog
,
1861 "RC: Not resuming sibling %s (has pending)\n",
1862 target_pid_to_str (lp
->ptid
));
1863 else if (debug_linux_nat
)
1864 fprintf_unfiltered (gdb_stdlog
,
1865 "RC: Not resuming sibling %s (not stopped)\n",
1866 target_pid_to_str (lp
->ptid
));
1872 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1879 resume_set_callback (struct lwp_info
*lp
, void *data
)
1886 linux_nat_resume (struct target_ops
*ops
,
1887 ptid_t ptid
, int step
, enum target_signal signo
)
1890 struct lwp_info
*lp
;
1893 if (debug_linux_nat
)
1894 fprintf_unfiltered (gdb_stdlog
,
1895 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1896 step
? "step" : "resume",
1897 target_pid_to_str (ptid
),
1898 (signo
!= TARGET_SIGNAL_0
1899 ? strsignal (target_signal_to_host (signo
)) : "0"),
1900 target_pid_to_str (inferior_ptid
));
1902 block_child_signals (&prev_mask
);
1904 /* A specific PTID means `step only this process id'. */
1905 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1906 || ptid_is_pid (ptid
));
1908 /* Mark the lwps we're resuming as resumed. */
1909 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1911 /* See if it's the current inferior that should be handled
1914 lp
= find_lwp_pid (inferior_ptid
);
1916 lp
= find_lwp_pid (ptid
);
1917 gdb_assert (lp
!= NULL
);
1919 /* Remember if we're stepping. */
1922 /* If we have a pending wait status for this thread, there is no
1923 point in resuming the process. But first make sure that
1924 linux_nat_wait won't preemptively handle the event - we
1925 should never take this short-circuit if we are going to
1926 leave LP running, since we have skipped resuming all the
1927 other threads. This bit of code needs to be synchronized
1928 with linux_nat_wait. */
1930 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1933 && WSTOPSIG (lp
->status
)
1934 && sigismember (&pass_mask
, WSTOPSIG (lp
->status
)))
1936 if (debug_linux_nat
)
1937 fprintf_unfiltered (gdb_stdlog
,
1938 "LLR: Not short circuiting for ignored "
1939 "status 0x%x\n", lp
->status
);
1941 /* FIXME: What should we do if we are supposed to continue
1942 this thread with a signal? */
1943 gdb_assert (signo
== TARGET_SIGNAL_0
);
1944 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1949 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1951 /* FIXME: What should we do if we are supposed to continue
1952 this thread with a signal? */
1953 gdb_assert (signo
== TARGET_SIGNAL_0
);
1955 if (debug_linux_nat
)
1956 fprintf_unfiltered (gdb_stdlog
,
1957 "LLR: Short circuiting for status 0x%x\n",
1960 restore_child_signals_mask (&prev_mask
);
1961 if (target_can_async_p ())
1963 target_async (inferior_event_handler
, 0);
1964 /* Tell the event loop we have something to process. */
1970 /* Mark LWP as not stopped to prevent it from being continued by
1975 iterate_over_lwps (ptid
, resume_callback
, NULL
);
1977 /* Convert to something the lower layer understands. */
1978 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
1980 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
1981 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1982 lp
->stopped_by_watchpoint
= 0;
1984 if (debug_linux_nat
)
1985 fprintf_unfiltered (gdb_stdlog
,
1986 "LLR: %s %s, %s (resume event thread)\n",
1987 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
1988 target_pid_to_str (ptid
),
1989 (signo
!= TARGET_SIGNAL_0
1990 ? strsignal (target_signal_to_host (signo
)) : "0"));
1992 restore_child_signals_mask (&prev_mask
);
1993 if (target_can_async_p ())
1994 target_async (inferior_event_handler
, 0);
1997 /* Send a signal to an LWP. */
2000 kill_lwp (int lwpid
, int signo
)
2002 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2003 fails, then we are not using nptl threads and we should be using kill. */
2005 #ifdef HAVE_TKILL_SYSCALL
2007 static int tkill_failed
;
2014 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2015 if (errno
!= ENOSYS
)
2022 return kill (lwpid
, signo
);
2025 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2026 event, check if the core is interested in it: if not, ignore the
2027 event, and keep waiting; otherwise, we need to toggle the LWP's
2028 syscall entry/exit status, since the ptrace event itself doesn't
2029 indicate it, and report the trap to higher layers. */
2032 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2034 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2035 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2036 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2040 /* If we're stopping threads, there's a SIGSTOP pending, which
2041 makes it so that the LWP reports an immediate syscall return,
2042 followed by the SIGSTOP. Skip seeing that "return" using
2043 PTRACE_CONT directly, and let stop_wait_callback collect the
2044 SIGSTOP. Later when the thread is resumed, a new syscall
2045 entry event. If we didn't do this (and returned 0), we'd
2046 leave a syscall entry pending, and our caller, by using
2047 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2048 itself. Later, when the user re-resumes this LWP, we'd see
2049 another syscall entry event and we'd mistake it for a return.
2051 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2052 (leaving immediately with LWP->signalled set, without issuing
2053 a PTRACE_CONT), it would still be problematic to leave this
2054 syscall enter pending, as later when the thread is resumed,
2055 it would then see the same syscall exit mentioned above,
2056 followed by the delayed SIGSTOP, while the syscall didn't
2057 actually get to execute. It seems it would be even more
2058 confusing to the user. */
2060 if (debug_linux_nat
)
2061 fprintf_unfiltered (gdb_stdlog
,
2062 "LHST: ignoring syscall %d "
2063 "for LWP %ld (stopping threads), "
2064 "resuming with PTRACE_CONT for SIGSTOP\n",
2066 GET_LWP (lp
->ptid
));
2068 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2069 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2073 if (catch_syscall_enabled ())
2075 /* Always update the entry/return state, even if this particular
2076 syscall isn't interesting to the core now. In async mode,
2077 the user could install a new catchpoint for this syscall
2078 between syscall enter/return, and we'll need to know to
2079 report a syscall return if that happens. */
2080 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2081 ? TARGET_WAITKIND_SYSCALL_RETURN
2082 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2084 if (catching_syscall_number (syscall_number
))
2086 /* Alright, an event to report. */
2087 ourstatus
->kind
= lp
->syscall_state
;
2088 ourstatus
->value
.syscall_number
= syscall_number
;
2090 if (debug_linux_nat
)
2091 fprintf_unfiltered (gdb_stdlog
,
2092 "LHST: stopping for %s of syscall %d"
2095 == TARGET_WAITKIND_SYSCALL_ENTRY
2096 ? "entry" : "return",
2098 GET_LWP (lp
->ptid
));
2102 if (debug_linux_nat
)
2103 fprintf_unfiltered (gdb_stdlog
,
2104 "LHST: ignoring %s of syscall %d "
2106 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2107 ? "entry" : "return",
2109 GET_LWP (lp
->ptid
));
2113 /* If we had been syscall tracing, and hence used PT_SYSCALL
2114 before on this LWP, it could happen that the user removes all
2115 syscall catchpoints before we get to process this event.
2116 There are two noteworthy issues here:
2118 - When stopped at a syscall entry event, resuming with
2119 PT_STEP still resumes executing the syscall and reports a
2122 - Only PT_SYSCALL catches syscall enters. If we last
2123 single-stepped this thread, then this event can't be a
2124 syscall enter. If we last single-stepped this thread, this
2125 has to be a syscall exit.
2127 The points above mean that the next resume, be it PT_STEP or
2128 PT_CONTINUE, can not trigger a syscall trace event. */
2129 if (debug_linux_nat
)
2130 fprintf_unfiltered (gdb_stdlog
,
2131 "LHST: caught syscall event "
2132 "with no syscall catchpoints."
2133 " %d for LWP %ld, ignoring\n",
2135 GET_LWP (lp
->ptid
));
2136 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2139 /* The core isn't interested in this event. For efficiency, avoid
2140 stopping all threads only to have the core resume them all again.
2141 Since we're not stopping threads, if we're still syscall tracing
2142 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2143 subsequent syscall. Simply resume using the inf-ptrace layer,
2144 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2146 /* Note that gdbarch_get_syscall_number may access registers, hence
2148 registers_changed ();
2149 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2150 lp
->step
, TARGET_SIGNAL_0
);
2154 /* Handle a GNU/Linux extended wait response. If we see a clone
2155 event, we need to add the new LWP to our list (and not report the
2156 trap to higher layers). This function returns non-zero if the
2157 event should be ignored and we should wait again. If STOPPING is
2158 true, the new LWP remains stopped, otherwise it is continued. */
2161 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2164 int pid
= GET_LWP (lp
->ptid
);
2165 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2166 int event
= status
>> 16;
2168 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2169 || event
== PTRACE_EVENT_CLONE
)
2171 unsigned long new_pid
;
2174 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2176 /* If we haven't already seen the new PID stop, wait for it now. */
2177 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2179 /* The new child has a pending SIGSTOP. We can't affect it until it
2180 hits the SIGSTOP, but we're already attached. */
2181 ret
= my_waitpid (new_pid
, &status
,
2182 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2184 perror_with_name (_("waiting for new child"));
2185 else if (ret
!= new_pid
)
2186 internal_error (__FILE__
, __LINE__
,
2187 _("wait returned unexpected PID %d"), ret
);
2188 else if (!WIFSTOPPED (status
))
2189 internal_error (__FILE__
, __LINE__
,
2190 _("wait returned unexpected status 0x%x"), status
);
2193 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2195 if (event
== PTRACE_EVENT_FORK
2196 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2198 /* Handle checkpointing by linux-fork.c here as a special
2199 case. We don't want the follow-fork-mode or 'catch fork'
2200 to interfere with this. */
2202 /* This won't actually modify the breakpoint list, but will
2203 physically remove the breakpoints from the child. */
2204 detach_breakpoints (new_pid
);
2206 /* Retain child fork in ptrace (stopped) state. */
2207 if (!find_fork_pid (new_pid
))
2210 /* Report as spurious, so that infrun doesn't want to follow
2211 this fork. We're actually doing an infcall in
2213 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2214 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2216 /* Report the stop to the core. */
2220 if (event
== PTRACE_EVENT_FORK
)
2221 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2222 else if (event
== PTRACE_EVENT_VFORK
)
2223 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2226 struct lwp_info
*new_lp
;
2228 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2230 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2232 new_lp
->stopped
= 1;
2234 if (WSTOPSIG (status
) != SIGSTOP
)
2236 /* This can happen if someone starts sending signals to
2237 the new thread before it gets a chance to run, which
2238 have a lower number than SIGSTOP (e.g. SIGUSR1).
2239 This is an unlikely case, and harder to handle for
2240 fork / vfork than for clone, so we do not try - but
2241 we handle it for clone events here. We'll send
2242 the other signal on to the thread below. */
2244 new_lp
->signalled
= 1;
2251 /* Add the new thread to GDB's lists as soon as possible
2254 1) the frontend doesn't have to wait for a stop to
2257 2) we tag it with the correct running state. */
2259 /* If the thread_db layer is active, let it know about
2260 this new thread, and add it to GDB's list. */
2261 if (!thread_db_attach_lwp (new_lp
->ptid
))
2263 /* We're not using thread_db. Add it to GDB's
2265 target_post_attach (GET_LWP (new_lp
->ptid
));
2266 add_thread (new_lp
->ptid
);
2271 set_running (new_lp
->ptid
, 1);
2272 set_executing (new_lp
->ptid
, 1);
2276 /* Note the need to use the low target ops to resume, to
2277 handle resuming with PT_SYSCALL if we have syscall
2281 enum target_signal signo
;
2283 new_lp
->stopped
= 0;
2284 new_lp
->resumed
= 1;
2287 ? target_signal_from_host (WSTOPSIG (status
))
2290 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2297 /* We created NEW_LP so it cannot yet contain STATUS. */
2298 gdb_assert (new_lp
->status
== 0);
2300 /* Save the wait status to report later. */
2301 if (debug_linux_nat
)
2302 fprintf_unfiltered (gdb_stdlog
,
2303 "LHEW: waitpid of new LWP %ld, "
2304 "saving status %s\n",
2305 (long) GET_LWP (new_lp
->ptid
),
2306 status_to_str (status
));
2307 new_lp
->status
= status
;
2311 if (debug_linux_nat
)
2312 fprintf_unfiltered (gdb_stdlog
,
2313 "LHEW: Got clone event "
2314 "from LWP %ld, resuming\n",
2315 GET_LWP (lp
->ptid
));
2316 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2317 0, TARGET_SIGNAL_0
);
2325 if (event
== PTRACE_EVENT_EXEC
)
2327 if (debug_linux_nat
)
2328 fprintf_unfiltered (gdb_stdlog
,
2329 "LHEW: Got exec event from LWP %ld\n",
2330 GET_LWP (lp
->ptid
));
2332 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2333 ourstatus
->value
.execd_pathname
2334 = xstrdup (linux_child_pid_to_exec_file (pid
));
2339 if (event
== PTRACE_EVENT_VFORK_DONE
)
2341 if (current_inferior ()->waiting_for_vfork_done
)
2343 if (debug_linux_nat
)
2344 fprintf_unfiltered (gdb_stdlog
,
2345 "LHEW: Got expected PTRACE_EVENT_"
2346 "VFORK_DONE from LWP %ld: stopping\n",
2347 GET_LWP (lp
->ptid
));
2349 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2353 if (debug_linux_nat
)
2354 fprintf_unfiltered (gdb_stdlog
,
2355 "LHEW: Got PTRACE_EVENT_VFORK_DONE "
2356 "from LWP %ld: resuming\n",
2357 GET_LWP (lp
->ptid
));
2358 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2362 internal_error (__FILE__
, __LINE__
,
2363 _("unknown ptrace event %d"), event
);
2366 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2370 wait_lwp (struct lwp_info
*lp
)
2374 int thread_dead
= 0;
2376 gdb_assert (!lp
->stopped
);
2377 gdb_assert (lp
->status
== 0);
2379 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2380 if (pid
== -1 && errno
== ECHILD
)
2382 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2383 if (pid
== -1 && errno
== ECHILD
)
2385 /* The thread has previously exited. We need to delete it
2386 now because, for some vendor 2.4 kernels with NPTL
2387 support backported, there won't be an exit event unless
2388 it is the main thread. 2.6 kernels will report an exit
2389 event for each thread that exits, as expected. */
2391 if (debug_linux_nat
)
2392 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2393 target_pid_to_str (lp
->ptid
));
2399 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2401 if (debug_linux_nat
)
2403 fprintf_unfiltered (gdb_stdlog
,
2404 "WL: waitpid %s received %s\n",
2405 target_pid_to_str (lp
->ptid
),
2406 status_to_str (status
));
2410 /* Check if the thread has exited. */
2411 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2414 if (debug_linux_nat
)
2415 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2416 target_pid_to_str (lp
->ptid
));
2425 gdb_assert (WIFSTOPPED (status
));
2427 /* Handle GNU/Linux's syscall SIGTRAPs. */
2428 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2430 /* No longer need the sysgood bit. The ptrace event ends up
2431 recorded in lp->waitstatus if we care for it. We can carry
2432 on handling the event like a regular SIGTRAP from here
2434 status
= W_STOPCODE (SIGTRAP
);
2435 if (linux_handle_syscall_trap (lp
, 1))
2436 return wait_lwp (lp
);
2439 /* Handle GNU/Linux's extended waitstatus for trace events. */
2440 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2442 if (debug_linux_nat
)
2443 fprintf_unfiltered (gdb_stdlog
,
2444 "WL: Handling extended status 0x%06x\n",
2446 if (linux_handle_extended_wait (lp
, status
, 1))
2447 return wait_lwp (lp
);
2453 /* Save the most recent siginfo for LP. This is currently only called
2454 for SIGTRAP; some ports use the si_addr field for
2455 target_stopped_data_address. In the future, it may also be used to
2456 restore the siginfo of requeued signals. */
2459 save_siginfo (struct lwp_info
*lp
)
2462 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2463 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2466 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2469 /* Send a SIGSTOP to LP. */
2472 stop_callback (struct lwp_info
*lp
, void *data
)
2474 if (!lp
->stopped
&& !lp
->signalled
)
2478 if (debug_linux_nat
)
2480 fprintf_unfiltered (gdb_stdlog
,
2481 "SC: kill %s **<SIGSTOP>**\n",
2482 target_pid_to_str (lp
->ptid
));
2485 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2486 if (debug_linux_nat
)
2488 fprintf_unfiltered (gdb_stdlog
,
2489 "SC: lwp kill %d %s\n",
2491 errno
? safe_strerror (errno
) : "ERRNO-OK");
2495 gdb_assert (lp
->status
== 0);
2501 /* Return non-zero if LWP PID has a pending SIGINT. */
2504 linux_nat_has_pending_sigint (int pid
)
2506 sigset_t pending
, blocked
, ignored
;
2508 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2510 if (sigismember (&pending
, SIGINT
)
2511 && !sigismember (&ignored
, SIGINT
))
2517 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2520 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2522 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2523 flag to consume the next one. */
2524 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2525 && WSTOPSIG (lp
->status
) == SIGINT
)
2528 lp
->ignore_sigint
= 1;
2533 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2534 This function is called after we know the LWP has stopped; if the LWP
2535 stopped before the expected SIGINT was delivered, then it will never have
2536 arrived. Also, if the signal was delivered to a shared queue and consumed
2537 by a different thread, it will never be delivered to this LWP. */
2540 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2542 if (!lp
->ignore_sigint
)
2545 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2547 if (debug_linux_nat
)
2548 fprintf_unfiltered (gdb_stdlog
,
2549 "MCIS: Clearing bogus flag for %s\n",
2550 target_pid_to_str (lp
->ptid
));
2551 lp
->ignore_sigint
= 0;
2555 /* Fetch the possible triggered data watchpoint info and store it in
2558 On some archs, like x86, that use debug registers to set
2559 watchpoints, it's possible that the way to know which watched
2560 address trapped, is to check the register that is used to select
2561 which address to watch. Problem is, between setting the watchpoint
2562 and reading back which data address trapped, the user may change
2563 the set of watchpoints, and, as a consequence, GDB changes the
2564 debug registers in the inferior. To avoid reading back a stale
2565 stopped-data-address when that happens, we cache in LP the fact
2566 that a watchpoint trapped, and the corresponding data address, as
2567 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2568 registers meanwhile, we have the cached data we can rely on. */
2571 save_sigtrap (struct lwp_info
*lp
)
2573 struct cleanup
*old_chain
;
2575 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2577 lp
->stopped_by_watchpoint
= 0;
2581 old_chain
= save_inferior_ptid ();
2582 inferior_ptid
= lp
->ptid
;
2584 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2586 if (lp
->stopped_by_watchpoint
)
2588 if (linux_ops
->to_stopped_data_address
!= NULL
)
2589 lp
->stopped_data_address_p
=
2590 linux_ops
->to_stopped_data_address (¤t_target
,
2591 &lp
->stopped_data_address
);
2593 lp
->stopped_data_address_p
= 0;
2596 do_cleanups (old_chain
);
2599 /* See save_sigtrap. */
2602 linux_nat_stopped_by_watchpoint (void)
2604 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2606 gdb_assert (lp
!= NULL
);
2608 return lp
->stopped_by_watchpoint
;
2612 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2614 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2616 gdb_assert (lp
!= NULL
);
2618 *addr_p
= lp
->stopped_data_address
;
2620 return lp
->stopped_data_address_p
;
2623 /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
2626 sigtrap_is_event (int status
)
2628 return WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
;
2631 /* SIGTRAP-like events recognizer. */
2633 static int (*linux_nat_status_is_event
) (int status
) = sigtrap_is_event
;
2635 /* Check for SIGTRAP-like events in LP. */
2638 linux_nat_lp_status_is_event (struct lwp_info
*lp
)
2640 /* We check for lp->waitstatus in addition to lp->status, because we can
2641 have pending process exits recorded in lp->status
2642 and W_EXITCODE(0,0) == 0. We should probably have an additional
2643 lp->status_p flag. */
2645 return (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2646 && linux_nat_status_is_event (lp
->status
));
2649 /* Set alternative SIGTRAP-like events recognizer. If
2650 breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
2654 linux_nat_set_status_is_event (struct target_ops
*t
,
2655 int (*status_is_event
) (int status
))
2657 linux_nat_status_is_event
= status_is_event
;
2660 /* Wait until LP is stopped. */
2663 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2665 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2667 /* If this is a vfork parent, bail out, it is not going to report
2668 any SIGSTOP until the vfork is done with. */
2669 if (inf
->vfork_child
!= NULL
)
2676 status
= wait_lwp (lp
);
2680 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2681 && WSTOPSIG (status
) == SIGINT
)
2683 lp
->ignore_sigint
= 0;
2686 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2687 if (debug_linux_nat
)
2688 fprintf_unfiltered (gdb_stdlog
,
2689 "PTRACE_CONT %s, 0, 0 (%s) "
2690 "(discarding SIGINT)\n",
2691 target_pid_to_str (lp
->ptid
),
2692 errno
? safe_strerror (errno
) : "OK");
2694 return stop_wait_callback (lp
, NULL
);
2697 maybe_clear_ignore_sigint (lp
);
2699 if (WSTOPSIG (status
) != SIGSTOP
)
2701 if (linux_nat_status_is_event (status
))
2703 /* If a LWP other than the LWP that we're reporting an
2704 event for has hit a GDB breakpoint (as opposed to
2705 some random trap signal), then just arrange for it to
2706 hit it again later. We don't keep the SIGTRAP status
2707 and don't forward the SIGTRAP signal to the LWP. We
2708 will handle the current event, eventually we will
2709 resume all LWPs, and this one will get its breakpoint
2712 If we do not do this, then we run the risk that the
2713 user will delete or disable the breakpoint, but the
2714 thread will have already tripped on it. */
2716 /* Save the trap's siginfo in case we need it later. */
2721 /* Now resume this LWP and get the SIGSTOP event. */
2723 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2724 if (debug_linux_nat
)
2726 fprintf_unfiltered (gdb_stdlog
,
2727 "PTRACE_CONT %s, 0, 0 (%s)\n",
2728 target_pid_to_str (lp
->ptid
),
2729 errno
? safe_strerror (errno
) : "OK");
2731 fprintf_unfiltered (gdb_stdlog
,
2732 "SWC: Candidate SIGTRAP event in %s\n",
2733 target_pid_to_str (lp
->ptid
));
2735 /* Hold this event/waitstatus while we check to see if
2736 there are any more (we still want to get that SIGSTOP). */
2737 stop_wait_callback (lp
, NULL
);
2739 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2740 there's another event, throw it back into the
2744 if (debug_linux_nat
)
2745 fprintf_unfiltered (gdb_stdlog
,
2746 "SWC: kill %s, %s\n",
2747 target_pid_to_str (lp
->ptid
),
2748 status_to_str ((int) status
));
2749 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2752 /* Save the sigtrap event. */
2753 lp
->status
= status
;
2758 /* The thread was stopped with a signal other than
2759 SIGSTOP, and didn't accidentally trip a breakpoint. */
2761 if (debug_linux_nat
)
2763 fprintf_unfiltered (gdb_stdlog
,
2764 "SWC: Pending event %s in %s\n",
2765 status_to_str ((int) status
),
2766 target_pid_to_str (lp
->ptid
));
2768 /* Now resume this LWP and get the SIGSTOP event. */
2770 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2771 if (debug_linux_nat
)
2772 fprintf_unfiltered (gdb_stdlog
,
2773 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2774 target_pid_to_str (lp
->ptid
),
2775 errno
? safe_strerror (errno
) : "OK");
2777 /* Hold this event/waitstatus while we check to see if
2778 there are any more (we still want to get that SIGSTOP). */
2779 stop_wait_callback (lp
, NULL
);
2781 /* If the lp->status field is still empty, use it to
2782 hold this event. If not, then this event must be
2783 returned to the event queue of the LWP. */
2786 if (debug_linux_nat
)
2788 fprintf_unfiltered (gdb_stdlog
,
2789 "SWC: kill %s, %s\n",
2790 target_pid_to_str (lp
->ptid
),
2791 status_to_str ((int) status
));
2793 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2796 lp
->status
= status
;
2802 /* We caught the SIGSTOP that we intended to catch, so
2803 there's no SIGSTOP pending. */
2812 /* Return non-zero if LP has a wait status pending. */
2815 status_callback (struct lwp_info
*lp
, void *data
)
2817 /* Only report a pending wait status if we pretend that this has
2818 indeed been resumed. */
2822 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2824 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2825 or a pending process exit. Note that `W_EXITCODE(0,0) ==
2826 0', so a clean process exit can not be stored pending in
2827 lp->status, it is indistinguishable from
2828 no-pending-status. */
2832 if (lp
->status
!= 0)
2838 /* Return non-zero if LP isn't stopped. */
2841 running_callback (struct lwp_info
*lp
, void *data
)
2843 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2846 /* Count the LWP's that have had events. */
2849 count_events_callback (struct lwp_info
*lp
, void *data
)
2853 gdb_assert (count
!= NULL
);
2855 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2856 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2862 /* Select the LWP (if any) that is currently being single-stepped. */
2865 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2867 if (lp
->step
&& lp
->status
!= 0)
2873 /* Select the Nth LWP that has had a SIGTRAP event. */
2876 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2878 int *selector
= data
;
2880 gdb_assert (selector
!= NULL
);
2882 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2883 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2884 if ((*selector
)-- == 0)
2891 cancel_breakpoint (struct lwp_info
*lp
)
2893 /* Arrange for a breakpoint to be hit again later. We don't keep
2894 the SIGTRAP status and don't forward the SIGTRAP signal to the
2895 LWP. We will handle the current event, eventually we will resume
2896 this LWP, and this breakpoint will trap again.
2898 If we do not do this, then we run the risk that the user will
2899 delete or disable the breakpoint, but the LWP will have already
2902 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2903 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2906 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2907 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2909 if (debug_linux_nat
)
2910 fprintf_unfiltered (gdb_stdlog
,
2911 "CB: Push back breakpoint for %s\n",
2912 target_pid_to_str (lp
->ptid
));
2914 /* Back up the PC if necessary. */
2915 if (gdbarch_decr_pc_after_break (gdbarch
))
2916 regcache_write_pc (regcache
, pc
);
2924 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2926 struct lwp_info
*event_lp
= data
;
2928 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2932 /* If a LWP other than the LWP that we're reporting an event for has
2933 hit a GDB breakpoint (as opposed to some random trap signal),
2934 then just arrange for it to hit it again later. We don't keep
2935 the SIGTRAP status and don't forward the SIGTRAP signal to the
2936 LWP. We will handle the current event, eventually we will resume
2937 all LWPs, and this one will get its breakpoint trap again.
2939 If we do not do this, then we run the risk that the user will
2940 delete or disable the breakpoint, but the LWP will have already
2943 if (linux_nat_lp_status_is_event (lp
)
2944 && cancel_breakpoint (lp
))
2945 /* Throw away the SIGTRAP. */
2951 /* Select one LWP out of those that have events pending. */
2954 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2957 int random_selector
;
2958 struct lwp_info
*event_lp
;
2960 /* Record the wait status for the original LWP. */
2961 (*orig_lp
)->status
= *status
;
2963 /* Give preference to any LWP that is being single-stepped. */
2964 event_lp
= iterate_over_lwps (filter
,
2965 select_singlestep_lwp_callback
, NULL
);
2966 if (event_lp
!= NULL
)
2968 if (debug_linux_nat
)
2969 fprintf_unfiltered (gdb_stdlog
,
2970 "SEL: Select single-step %s\n",
2971 target_pid_to_str (event_lp
->ptid
));
2975 /* No single-stepping LWP. Select one at random, out of those
2976 which have had SIGTRAP events. */
2978 /* First see how many SIGTRAP events we have. */
2979 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2981 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2982 random_selector
= (int)
2983 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2985 if (debug_linux_nat
&& num_events
> 1)
2986 fprintf_unfiltered (gdb_stdlog
,
2987 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2988 num_events
, random_selector
);
2990 event_lp
= iterate_over_lwps (filter
,
2991 select_event_lwp_callback
,
2995 if (event_lp
!= NULL
)
2997 /* Switch the event LWP. */
2998 *orig_lp
= event_lp
;
2999 *status
= event_lp
->status
;
3002 /* Flush the wait status for the event LWP. */
3003 (*orig_lp
)->status
= 0;
3006 /* Return non-zero if LP has been resumed. */
3009 resumed_callback (struct lwp_info
*lp
, void *data
)
3014 /* Stop an active thread, verify it still exists, then resume it. */
3017 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
3019 struct lwp_info
*ptr
;
3021 if (!lp
->stopped
&& !lp
->signalled
)
3023 stop_callback (lp
, NULL
);
3024 stop_wait_callback (lp
, NULL
);
3025 /* Resume if the lwp still exists. */
3026 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
3029 resume_callback (lp
, NULL
);
3030 resume_set_callback (lp
, NULL
);
3036 /* Check if we should go on and pass this event to common code.
3037 Return the affected lwp if we are, or NULL otherwise. */
3038 static struct lwp_info
*
3039 linux_nat_filter_event (int lwpid
, int status
, int options
)
3041 struct lwp_info
*lp
;
3043 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3045 /* Check for stop events reported by a process we didn't already
3046 know about - anything not already in our LWP list.
3048 If we're expecting to receive stopped processes after
3049 fork, vfork, and clone events, then we'll just add the
3050 new one to our list and go back to waiting for the event
3051 to be reported - the stopped process might be returned
3052 from waitpid before or after the event is. */
3053 if (WIFSTOPPED (status
) && !lp
)
3055 linux_record_stopped_pid (lwpid
, status
);
3059 /* Make sure we don't report an event for the exit of an LWP not in
3060 our list, i.e. not part of the current process. This can happen
3061 if we detach from a program we originally forked and then it
3063 if (!WIFSTOPPED (status
) && !lp
)
3066 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3067 CLONE_PTRACE processes which do not use the thread library -
3068 otherwise we wouldn't find the new LWP this way. That doesn't
3069 currently work, and the following code is currently unreachable
3070 due to the two blocks above. If it's fixed some day, this code
3071 should be broken out into a function so that we can also pick up
3072 LWPs from the new interface. */
3075 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3076 if (options
& __WCLONE
)
3079 gdb_assert (WIFSTOPPED (status
)
3080 && WSTOPSIG (status
) == SIGSTOP
);
3083 if (!in_thread_list (inferior_ptid
))
3085 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3086 GET_PID (inferior_ptid
));
3087 add_thread (inferior_ptid
);
3090 add_thread (lp
->ptid
);
3093 /* Handle GNU/Linux's syscall SIGTRAPs. */
3094 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3096 /* No longer need the sysgood bit. The ptrace event ends up
3097 recorded in lp->waitstatus if we care for it. We can carry
3098 on handling the event like a regular SIGTRAP from here
3100 status
= W_STOPCODE (SIGTRAP
);
3101 if (linux_handle_syscall_trap (lp
, 0))
3105 /* Handle GNU/Linux's extended waitstatus for trace events. */
3106 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3108 if (debug_linux_nat
)
3109 fprintf_unfiltered (gdb_stdlog
,
3110 "LLW: Handling extended status 0x%06x\n",
3112 if (linux_handle_extended_wait (lp
, status
, 0))
3116 if (linux_nat_status_is_event (status
))
3118 /* Save the trap's siginfo in case we need it later. */
3124 /* Check if the thread has exited. */
3125 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3126 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3128 /* If this is the main thread, we must stop all threads and verify
3129 if they are still alive. This is because in the nptl thread model
3130 on Linux 2.4, there is no signal issued for exiting LWPs
3131 other than the main thread. We only get the main thread exit
3132 signal once all child threads have already exited. If we
3133 stop all the threads and use the stop_wait_callback to check
3134 if they have exited we can determine whether this signal
3135 should be ignored or whether it means the end of the debugged
3136 application, regardless of which threading model is being
3138 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3141 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3142 stop_and_resume_callback
, NULL
);
3145 if (debug_linux_nat
)
3146 fprintf_unfiltered (gdb_stdlog
,
3147 "LLW: %s exited.\n",
3148 target_pid_to_str (lp
->ptid
));
3150 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3152 /* If there is at least one more LWP, then the exit signal
3153 was not the end of the debugged application and should be
3160 /* Check if the current LWP has previously exited. In the nptl
3161 thread model, LWPs other than the main thread do not issue
3162 signals when they exit so we must check whenever the thread has
3163 stopped. A similar check is made in stop_wait_callback(). */
3164 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3166 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3168 if (debug_linux_nat
)
3169 fprintf_unfiltered (gdb_stdlog
,
3170 "LLW: %s exited.\n",
3171 target_pid_to_str (lp
->ptid
));
3175 /* Make sure there is at least one thread running. */
3176 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3178 /* Discard the event. */
3182 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3183 an attempt to stop an LWP. */
3185 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3187 if (debug_linux_nat
)
3188 fprintf_unfiltered (gdb_stdlog
,
3189 "LLW: Delayed SIGSTOP caught for %s.\n",
3190 target_pid_to_str (lp
->ptid
));
3192 /* This is a delayed SIGSTOP. */
3195 registers_changed ();
3197 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3198 lp
->step
, TARGET_SIGNAL_0
);
3199 if (debug_linux_nat
)
3200 fprintf_unfiltered (gdb_stdlog
,
3201 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3203 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3204 target_pid_to_str (lp
->ptid
));
3207 gdb_assert (lp
->resumed
);
3209 /* Discard the event. */
3213 /* Make sure we don't report a SIGINT that we have already displayed
3214 for another thread. */
3215 if (lp
->ignore_sigint
3216 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3218 if (debug_linux_nat
)
3219 fprintf_unfiltered (gdb_stdlog
,
3220 "LLW: Delayed SIGINT caught for %s.\n",
3221 target_pid_to_str (lp
->ptid
));
3223 /* This is a delayed SIGINT. */
3224 lp
->ignore_sigint
= 0;
3226 registers_changed ();
3227 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3228 lp
->step
, TARGET_SIGNAL_0
);
3229 if (debug_linux_nat
)
3230 fprintf_unfiltered (gdb_stdlog
,
3231 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3233 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3234 target_pid_to_str (lp
->ptid
));
3237 gdb_assert (lp
->resumed
);
3239 /* Discard the event. */
3243 /* An interesting event. */
3245 lp
->status
= status
;
3250 linux_nat_wait_1 (struct target_ops
*ops
,
3251 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3254 static sigset_t prev_mask
;
3255 struct lwp_info
*lp
= NULL
;
3260 if (debug_linux_nat_async
)
3261 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3263 /* The first time we get here after starting a new inferior, we may
3264 not have added it to the LWP list yet - this is the earliest
3265 moment at which we know its PID. */
3266 if (ptid_is_pid (inferior_ptid
))
3268 /* Upgrade the main thread's ptid. */
3269 thread_change_ptid (inferior_ptid
,
3270 BUILD_LWP (GET_PID (inferior_ptid
),
3271 GET_PID (inferior_ptid
)));
3273 lp
= add_lwp (inferior_ptid
);
3277 /* Make sure SIGCHLD is blocked. */
3278 block_child_signals (&prev_mask
);
3280 if (ptid_equal (ptid
, minus_one_ptid
))
3282 else if (ptid_is_pid (ptid
))
3283 /* A request to wait for a specific tgid. This is not possible
3284 with waitpid, so instead, we wait for any child, and leave
3285 children we're not interested in right now with a pending
3286 status to report later. */
3289 pid
= GET_LWP (ptid
);
3295 /* Make sure that of those LWPs we want to get an event from, there
3296 is at least one LWP that has been resumed. If there's none, just
3297 bail out. The core may just be flushing asynchronously all
3299 if (iterate_over_lwps (ptid
, resumed_callback
, NULL
) == NULL
)
3301 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3303 if (debug_linux_nat_async
)
3304 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (no resumed LWP)\n");
3306 restore_child_signals_mask (&prev_mask
);
3307 return minus_one_ptid
;
3310 /* First check if there is a LWP with a wait status pending. */
3313 /* Any LWP that's been resumed will do. */
3314 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3317 if (debug_linux_nat
&& lp
->status
)
3318 fprintf_unfiltered (gdb_stdlog
,
3319 "LLW: Using pending wait status %s for %s.\n",
3320 status_to_str (lp
->status
),
3321 target_pid_to_str (lp
->ptid
));
3324 /* But if we don't find one, we'll have to wait, and check both
3325 cloned and uncloned processes. We start with the cloned
3327 options
= __WCLONE
| WNOHANG
;
3329 else if (is_lwp (ptid
))
3331 if (debug_linux_nat
)
3332 fprintf_unfiltered (gdb_stdlog
,
3333 "LLW: Waiting for specific LWP %s.\n",
3334 target_pid_to_str (ptid
));
3336 /* We have a specific LWP to check. */
3337 lp
= find_lwp_pid (ptid
);
3340 if (debug_linux_nat
&& lp
->status
)
3341 fprintf_unfiltered (gdb_stdlog
,
3342 "LLW: Using pending wait status %s for %s.\n",
3343 status_to_str (lp
->status
),
3344 target_pid_to_str (lp
->ptid
));
3346 /* If we have to wait, take into account whether PID is a cloned
3347 process or not. And we have to convert it to something that
3348 the layer beneath us can understand. */
3349 options
= lp
->cloned
? __WCLONE
: 0;
3350 pid
= GET_LWP (ptid
);
3352 /* We check for lp->waitstatus in addition to lp->status,
3353 because we can have pending process exits recorded in
3354 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3355 an additional lp->status_p flag. */
3356 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3360 if (lp
&& lp
->signalled
)
3362 /* A pending SIGSTOP may interfere with the normal stream of
3363 events. In a typical case where interference is a problem,
3364 we have a SIGSTOP signal pending for LWP A while
3365 single-stepping it, encounter an event in LWP B, and take the
3366 pending SIGSTOP while trying to stop LWP A. After processing
3367 the event in LWP B, LWP A is continued, and we'll never see
3368 the SIGTRAP associated with the last time we were
3369 single-stepping LWP A. */
3371 /* Resume the thread. It should halt immediately returning the
3373 registers_changed ();
3374 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3375 lp
->step
, TARGET_SIGNAL_0
);
3376 if (debug_linux_nat
)
3377 fprintf_unfiltered (gdb_stdlog
,
3378 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3379 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3380 target_pid_to_str (lp
->ptid
));
3382 gdb_assert (lp
->resumed
);
3384 /* Catch the pending SIGSTOP. */
3385 status
= lp
->status
;
3388 stop_wait_callback (lp
, NULL
);
3390 /* If the lp->status field isn't empty, we caught another signal
3391 while flushing the SIGSTOP. Return it back to the event
3392 queue of the LWP, as we already have an event to handle. */
3395 if (debug_linux_nat
)
3396 fprintf_unfiltered (gdb_stdlog
,
3397 "LLW: kill %s, %s\n",
3398 target_pid_to_str (lp
->ptid
),
3399 status_to_str (lp
->status
));
3400 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3403 lp
->status
= status
;
3406 if (!target_can_async_p ())
3408 /* Causes SIGINT to be passed on to the attached process. */
3412 /* Translate generic target_wait options into waitpid options. */
3413 if (target_options
& TARGET_WNOHANG
)
3420 lwpid
= my_waitpid (pid
, &status
, options
);
3424 gdb_assert (pid
== -1 || lwpid
== pid
);
3426 if (debug_linux_nat
)
3428 fprintf_unfiltered (gdb_stdlog
,
3429 "LLW: waitpid %ld received %s\n",
3430 (long) lwpid
, status_to_str (status
));
3433 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3435 /* STATUS is now no longer valid, use LP->STATUS instead. */
3439 && ptid_is_pid (ptid
)
3440 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3442 gdb_assert (lp
->resumed
);
3444 if (debug_linux_nat
)
3446 "LWP %ld got an event %06x, leaving pending.\n",
3447 ptid_get_lwp (lp
->ptid
), lp
->status
);
3449 if (WIFSTOPPED (lp
->status
))
3451 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3453 /* Cancel breakpoint hits. The breakpoint may
3454 be removed before we fetch events from this
3455 process to report to the core. It is best
3456 not to assume the moribund breakpoints
3457 heuristic always handles these cases --- it
3458 could be too many events go through to the
3459 core before this one is handled. All-stop
3460 always cancels breakpoint hits in all
3463 && linux_nat_lp_status_is_event (lp
)
3464 && cancel_breakpoint (lp
))
3466 /* Throw away the SIGTRAP. */
3469 if (debug_linux_nat
)
3471 "LLW: LWP %ld hit a breakpoint while"
3472 " waiting for another process;"
3474 ptid_get_lwp (lp
->ptid
));
3484 else if (WIFEXITED (lp
->status
) || WIFSIGNALED (lp
->status
))
3486 if (debug_linux_nat
)
3488 "Process %ld exited while stopping LWPs\n",
3489 ptid_get_lwp (lp
->ptid
));
3491 /* This was the last lwp in the process. Since
3492 events are serialized to GDB core, and we can't
3493 report this one right now, but GDB core and the
3494 other target layers will want to be notified
3495 about the exit code/signal, leave the status
3496 pending for the next time we're able to report
3499 /* Prevent trying to stop this thread again. We'll
3500 never try to resume it because it has a pending
3504 /* Dead LWP's aren't expected to reported a pending
3508 /* Store the pending event in the waitstatus as
3509 well, because W_EXITCODE(0,0) == 0. */
3510 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3524 /* waitpid did return something. Restart over. */
3525 options
|= __WCLONE
;
3533 /* Alternate between checking cloned and uncloned processes. */
3534 options
^= __WCLONE
;
3536 /* And every time we have checked both:
3537 In async mode, return to event loop;
3538 In sync mode, suspend waiting for a SIGCHLD signal. */
3539 if (options
& __WCLONE
)
3541 if (target_options
& TARGET_WNOHANG
)
3543 /* No interesting event. */
3544 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3546 if (debug_linux_nat_async
)
3547 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3549 restore_child_signals_mask (&prev_mask
);
3550 return minus_one_ptid
;
3553 sigsuspend (&suspend_mask
);
3556 else if (target_options
& TARGET_WNOHANG
)
3558 /* No interesting event for PID yet. */
3559 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3561 if (debug_linux_nat_async
)
3562 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3564 restore_child_signals_mask (&prev_mask
);
3565 return minus_one_ptid
;
3568 /* We shouldn't end up here unless we want to try again. */
3569 gdb_assert (lp
== NULL
);
3572 if (!target_can_async_p ())
3573 clear_sigint_trap ();
3577 status
= lp
->status
;
3580 /* Don't report signals that GDB isn't interested in, such as
3581 signals that are neither printed nor stopped upon. Stopping all
3582 threads can be a bit time-consuming so if we want decent
3583 performance with heavily multi-threaded programs, especially when
3584 they're using a high frequency timer, we'd better avoid it if we
3587 if (WIFSTOPPED (status
))
3589 enum target_signal signo
= target_signal_from_host (WSTOPSIG (status
));
3591 /* When using hardware single-step, we need to report every signal.
3592 Otherwise, signals in pass_mask may be short-circuited. */
3594 && WSTOPSIG (status
) && sigismember (&pass_mask
, WSTOPSIG (status
)))
3596 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3597 here? It is not clear we should. GDB may not expect
3598 other threads to run. On the other hand, not resuming
3599 newly attached threads may cause an unwanted delay in
3600 getting them running. */
3601 registers_changed ();
3602 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3604 if (debug_linux_nat
)
3605 fprintf_unfiltered (gdb_stdlog
,
3606 "LLW: %s %s, %s (preempt 'handle')\n",
3608 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3609 target_pid_to_str (lp
->ptid
),
3610 (signo
!= TARGET_SIGNAL_0
3611 ? strsignal (target_signal_to_host (signo
))
3619 /* Only do the below in all-stop, as we currently use SIGINT
3620 to implement target_stop (see linux_nat_stop) in
3622 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3624 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3625 forwarded to the entire process group, that is, all LWPs
3626 will receive it - unless they're using CLONE_THREAD to
3627 share signals. Since we only want to report it once, we
3628 mark it as ignored for all LWPs except this one. */
3629 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3630 set_ignore_sigint
, NULL
);
3631 lp
->ignore_sigint
= 0;
3634 maybe_clear_ignore_sigint (lp
);
3638 /* This LWP is stopped now. */
3641 if (debug_linux_nat
)
3642 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3643 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3647 /* Now stop all other LWP's ... */
3648 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3650 /* ... and wait until all of them have reported back that
3651 they're no longer running. */
3652 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3654 /* If we're not waiting for a specific LWP, choose an event LWP
3655 from among those that have had events. Giving equal priority
3656 to all LWPs that have had events helps prevent
3659 select_event_lwp (ptid
, &lp
, &status
);
3661 /* Now that we've selected our final event LWP, cancel any
3662 breakpoints in other LWPs that have hit a GDB breakpoint.
3663 See the comment in cancel_breakpoints_callback to find out
3665 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3667 /* In all-stop, from the core's perspective, all LWPs are now
3668 stopped until a new resume action is sent over. */
3669 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
3674 if (linux_nat_status_is_event (status
))
3676 if (debug_linux_nat
)
3677 fprintf_unfiltered (gdb_stdlog
,
3678 "LLW: trap ptid is %s.\n",
3679 target_pid_to_str (lp
->ptid
));
3682 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3684 *ourstatus
= lp
->waitstatus
;
3685 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3688 store_waitstatus (ourstatus
, status
);
3690 if (debug_linux_nat_async
)
3691 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3693 restore_child_signals_mask (&prev_mask
);
3695 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
3696 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
3699 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3704 /* Resume LWPs that are currently stopped without any pending status
3705 to report, but are resumed from the core's perspective. */
3708 resume_stopped_resumed_lwps (struct lwp_info
*lp
, void *data
)
3710 ptid_t
*wait_ptid_p
= data
;
3715 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3717 gdb_assert (is_executing (lp
->ptid
));
3719 /* Don't bother if there's a breakpoint at PC that we'd hit
3720 immediately, and we're not waiting for this LWP. */
3721 if (!ptid_match (lp
->ptid
, *wait_ptid_p
))
3723 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
3724 CORE_ADDR pc
= regcache_read_pc (regcache
);
3726 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3730 if (debug_linux_nat
)
3731 fprintf_unfiltered (gdb_stdlog
,
3732 "RSRL: resuming stopped-resumed LWP %s\n",
3733 target_pid_to_str (lp
->ptid
));
3735 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3736 lp
->step
, TARGET_SIGNAL_0
);
3738 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
3739 lp
->stopped_by_watchpoint
= 0;
3746 linux_nat_wait (struct target_ops
*ops
,
3747 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3752 if (debug_linux_nat
)
3753 fprintf_unfiltered (gdb_stdlog
,
3754 "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3756 /* Flush the async file first. */
3757 if (target_can_async_p ())
3758 async_file_flush ();
3760 /* Resume LWPs that are currently stopped without any pending status
3761 to report, but are resumed from the core's perspective. LWPs get
3762 in this state if we find them stopping at a time we're not
3763 interested in reporting the event (target_wait on a
3764 specific_process, for example, see linux_nat_wait_1), and
3765 meanwhile the event became uninteresting. Don't bother resuming
3766 LWPs we're not going to wait for if they'd stop immediately. */
3768 iterate_over_lwps (minus_one_ptid
, resume_stopped_resumed_lwps
, &ptid
);
3770 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3772 /* If we requested any event, and something came out, assume there
3773 may be more. If we requested a specific lwp or process, also
3774 assume there may be more. */
3775 if (target_can_async_p ()
3776 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3777 || !ptid_equal (ptid
, minus_one_ptid
)))
3780 /* Get ready for the next event. */
3781 if (target_can_async_p ())
3782 target_async (inferior_event_handler
, 0);
3788 kill_callback (struct lwp_info
*lp
, void *data
)
3791 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3792 if (debug_linux_nat
)
3793 fprintf_unfiltered (gdb_stdlog
,
3794 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3795 target_pid_to_str (lp
->ptid
),
3796 errno
? safe_strerror (errno
) : "OK");
3802 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3806 /* We must make sure that there are no pending events (delayed
3807 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3808 program doesn't interfere with any following debugging session. */
3810 /* For cloned processes we must check both with __WCLONE and
3811 without, since the exit status of a cloned process isn't reported
3817 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3818 if (pid
!= (pid_t
) -1)
3820 if (debug_linux_nat
)
3821 fprintf_unfiltered (gdb_stdlog
,
3822 "KWC: wait %s received unknown.\n",
3823 target_pid_to_str (lp
->ptid
));
3824 /* The Linux kernel sometimes fails to kill a thread
3825 completely after PTRACE_KILL; that goes from the stop
3826 point in do_fork out to the one in
3827 get_signal_to_deliever and waits again. So kill it
3829 kill_callback (lp
, NULL
);
3832 while (pid
== GET_LWP (lp
->ptid
));
3834 gdb_assert (pid
== -1 && errno
== ECHILD
);
3839 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3840 if (pid
!= (pid_t
) -1)
3842 if (debug_linux_nat
)
3843 fprintf_unfiltered (gdb_stdlog
,
3844 "KWC: wait %s received unk.\n",
3845 target_pid_to_str (lp
->ptid
));
3846 /* See the call to kill_callback above. */
3847 kill_callback (lp
, NULL
);
3850 while (pid
== GET_LWP (lp
->ptid
));
3852 gdb_assert (pid
== -1 && errno
== ECHILD
);
3857 linux_nat_kill (struct target_ops
*ops
)
3859 struct target_waitstatus last
;
3863 /* If we're stopped while forking and we haven't followed yet,
3864 kill the other task. We need to do this first because the
3865 parent will be sleeping if this is a vfork. */
3867 get_last_target_status (&last_ptid
, &last
);
3869 if (last
.kind
== TARGET_WAITKIND_FORKED
3870 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3872 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3876 if (forks_exist_p ())
3877 linux_fork_killall ();
3880 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3882 /* Stop all threads before killing them, since ptrace requires
3883 that the thread is stopped to sucessfully PTRACE_KILL. */
3884 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3885 /* ... and wait until all of them have reported back that
3886 they're no longer running. */
3887 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3889 /* Kill all LWP's ... */
3890 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3892 /* ... and wait until we've flushed all events. */
3893 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3896 target_mourn_inferior ();
3900 linux_nat_mourn_inferior (struct target_ops
*ops
)
3902 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3904 if (! forks_exist_p ())
3905 /* Normal case, no other forks available. */
3906 linux_ops
->to_mourn_inferior (ops
);
3908 /* Multi-fork case. The current inferior_ptid has exited, but
3909 there are other viable forks to debug. Delete the exiting
3910 one and context-switch to the first available. */
3911 linux_fork_mourn_inferior ();
3914 /* Convert a native/host siginfo object, into/from the siginfo in the
3915 layout of the inferiors' architecture. */
3918 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3922 if (linux_nat_siginfo_fixup
!= NULL
)
3923 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3925 /* If there was no callback, or the callback didn't do anything,
3926 then just do a straight memcpy. */
3930 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3932 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3937 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3938 const char *annex
, gdb_byte
*readbuf
,
3939 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3942 struct siginfo siginfo
;
3943 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3945 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3946 gdb_assert (readbuf
|| writebuf
);
3948 pid
= GET_LWP (inferior_ptid
);
3950 pid
= GET_PID (inferior_ptid
);
3952 if (offset
> sizeof (siginfo
))
3956 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3960 /* When GDB is built as a 64-bit application, ptrace writes into
3961 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3962 inferior with a 64-bit GDB should look the same as debugging it
3963 with a 32-bit GDB, we need to convert it. GDB core always sees
3964 the converted layout, so any read/write will have to be done
3966 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3968 if (offset
+ len
> sizeof (siginfo
))
3969 len
= sizeof (siginfo
) - offset
;
3971 if (readbuf
!= NULL
)
3972 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3975 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3977 /* Convert back to ptrace layout before flushing it out. */
3978 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3981 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3990 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
3991 const char *annex
, gdb_byte
*readbuf
,
3992 const gdb_byte
*writebuf
,
3993 ULONGEST offset
, LONGEST len
)
3995 struct cleanup
*old_chain
;
3998 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
3999 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
4002 /* The target is connected but no live inferior is selected. Pass
4003 this request down to a lower stratum (e.g., the executable
4005 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
4008 old_chain
= save_inferior_ptid ();
4010 if (is_lwp (inferior_ptid
))
4011 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
4013 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
4016 do_cleanups (old_chain
);
4021 linux_thread_alive (ptid_t ptid
)
4025 gdb_assert (is_lwp (ptid
));
4027 /* Send signal 0 instead of anything ptrace, because ptracing a
4028 running thread errors out claiming that the thread doesn't
4030 err
= kill_lwp (GET_LWP (ptid
), 0);
4032 if (debug_linux_nat
)
4033 fprintf_unfiltered (gdb_stdlog
,
4034 "LLTA: KILL(SIG0) %s (%s)\n",
4035 target_pid_to_str (ptid
),
4036 err
? safe_strerror (tmp_errno
) : "OK");
4045 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
4047 return linux_thread_alive (ptid
);
4051 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
4053 static char buf
[64];
4056 && (GET_PID (ptid
) != GET_LWP (ptid
)
4057 || num_lwps (GET_PID (ptid
)) > 1))
4059 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
4063 return normal_pid_to_str (ptid
);
4067 linux_nat_thread_name (struct thread_info
*thr
)
4069 int pid
= ptid_get_pid (thr
->ptid
);
4070 long lwp
= ptid_get_lwp (thr
->ptid
);
4071 #define FORMAT "/proc/%d/task/%ld/comm"
4072 char buf
[sizeof (FORMAT
) + 30];
4074 char *result
= NULL
;
4076 snprintf (buf
, sizeof (buf
), FORMAT
, pid
, lwp
);
4077 comm_file
= fopen (buf
, "r");
4080 /* Not exported by the kernel, so we define it here. */
4082 static char line
[COMM_LEN
+ 1];
4084 if (fgets (line
, sizeof (line
), comm_file
))
4086 char *nl
= strchr (line
, '\n');
4103 /* Accepts an integer PID; Returns a string representing a file that
4104 can be opened to get the symbols for the child process. */
4107 linux_child_pid_to_exec_file (int pid
)
4109 char *name1
, *name2
;
4111 name1
= xmalloc (MAXPATHLEN
);
4112 name2
= xmalloc (MAXPATHLEN
);
4113 make_cleanup (xfree
, name1
);
4114 make_cleanup (xfree
, name2
);
4115 memset (name2
, 0, MAXPATHLEN
);
4117 sprintf (name1
, "/proc/%d/exe", pid
);
4118 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
4124 /* Service function for corefiles and info proc. */
4127 read_mapping (FILE *mapfile
,
4132 char *device
, long long *inode
, char *filename
)
4134 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
4135 addr
, endaddr
, permissions
, offset
, device
, inode
);
4138 if (ret
> 0 && ret
!= EOF
)
4140 /* Eat everything up to EOL for the filename. This will prevent
4141 weird filenames (such as one with embedded whitespace) from
4142 confusing this code. It also makes this code more robust in
4143 respect to annotations the kernel may add after the filename.
4145 Note the filename is used for informational purposes
4147 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4150 return (ret
!= 0 && ret
!= EOF
);
4153 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4154 regions in the inferior for a corefile. */
4157 linux_nat_find_memory_regions (find_memory_region_ftype func
, void *obfd
)
4159 int pid
= PIDGET (inferior_ptid
);
4160 char mapsfilename
[MAXPATHLEN
];
4162 long long addr
, endaddr
, size
, offset
, inode
;
4163 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4164 int read
, write
, exec
;
4165 struct cleanup
*cleanup
;
4167 /* Compose the filename for the /proc memory map, and open it. */
4168 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4169 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4170 error (_("Could not open %s."), mapsfilename
);
4171 cleanup
= make_cleanup_fclose (mapsfile
);
4174 fprintf_filtered (gdb_stdout
,
4175 "Reading memory regions from %s\n", mapsfilename
);
4177 /* Now iterate until end-of-file. */
4178 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4179 &offset
, &device
[0], &inode
, &filename
[0]))
4181 size
= endaddr
- addr
;
4183 /* Get the segment's permissions. */
4184 read
= (strchr (permissions
, 'r') != 0);
4185 write
= (strchr (permissions
, 'w') != 0);
4186 exec
= (strchr (permissions
, 'x') != 0);
4190 fprintf_filtered (gdb_stdout
,
4191 "Save segment, %s bytes at %s (%c%c%c)",
4192 plongest (size
), paddress (target_gdbarch
, addr
),
4194 write
? 'w' : ' ', exec
? 'x' : ' ');
4196 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4197 fprintf_filtered (gdb_stdout
, "\n");
4200 /* Invoke the callback function to create the corefile
4202 func (addr
, size
, read
, write
, exec
, obfd
);
4204 do_cleanups (cleanup
);
4209 find_signalled_thread (struct thread_info
*info
, void *data
)
4211 if (info
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4212 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4218 static enum target_signal
4219 find_stop_signal (void)
4221 struct thread_info
*info
=
4222 iterate_over_threads (find_signalled_thread
, NULL
);
4225 return info
->suspend
.stop_signal
;
4227 return TARGET_SIGNAL_0
;
4230 /* Records the thread's register state for the corefile note
4234 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4235 char *note_data
, int *note_size
,
4236 enum target_signal stop_signal
)
4238 unsigned long lwp
= ptid_get_lwp (ptid
);
4239 struct gdbarch
*gdbarch
= target_gdbarch
;
4240 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4241 const struct regset
*regset
;
4243 struct cleanup
*old_chain
;
4244 struct core_regset_section
*sect_list
;
4247 old_chain
= save_inferior_ptid ();
4248 inferior_ptid
= ptid
;
4249 target_fetch_registers (regcache
, -1);
4250 do_cleanups (old_chain
);
4252 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4253 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4255 /* The loop below uses the new struct core_regset_section, which stores
4256 the supported section names and sizes for the core file. Note that
4257 note PRSTATUS needs to be treated specially. But the other notes are
4258 structurally the same, so they can benefit from the new struct. */
4259 if (core_regset_p
&& sect_list
!= NULL
)
4260 while (sect_list
->sect_name
!= NULL
)
4262 regset
= gdbarch_regset_from_core_section (gdbarch
,
4263 sect_list
->sect_name
,
4265 gdb_assert (regset
&& regset
->collect_regset
);
4266 gdb_regset
= xmalloc (sect_list
->size
);
4267 regset
->collect_regset (regset
, regcache
, -1,
4268 gdb_regset
, sect_list
->size
);
4270 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4271 note_data
= (char *) elfcore_write_prstatus
4272 (obfd
, note_data
, note_size
,
4273 lwp
, target_signal_to_host (stop_signal
),
4276 note_data
= (char *) elfcore_write_register_note
4277 (obfd
, note_data
, note_size
,
4278 sect_list
->sect_name
, gdb_regset
,
4284 /* For architectures that does not have the struct core_regset_section
4285 implemented, we use the old method. When all the architectures have
4286 the new support, the code below should be deleted. */
4289 gdb_gregset_t gregs
;
4290 gdb_fpregset_t fpregs
;
4293 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4295 != NULL
&& regset
->collect_regset
!= NULL
)
4296 regset
->collect_regset (regset
, regcache
, -1,
4297 &gregs
, sizeof (gregs
));
4299 fill_gregset (regcache
, &gregs
, -1);
4301 note_data
= (char *) elfcore_write_prstatus
4302 (obfd
, note_data
, note_size
, lwp
, target_signal_to_host (stop_signal
),
4306 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4308 != NULL
&& regset
->collect_regset
!= NULL
)
4309 regset
->collect_regset (regset
, regcache
, -1,
4310 &fpregs
, sizeof (fpregs
));
4312 fill_fpregset (regcache
, &fpregs
, -1);
4314 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4317 &fpregs
, sizeof (fpregs
));
4323 struct linux_nat_corefile_thread_data
4329 enum target_signal stop_signal
;
4332 /* Called by gdbthread.c once per thread. Records the thread's
4333 register state for the corefile note section. */
4336 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4338 struct linux_nat_corefile_thread_data
*args
= data
;
4340 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4350 /* Enumerate spufs IDs for process PID. */
4353 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4357 struct dirent
*entry
;
4359 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4360 dir
= opendir (path
);
4365 while ((entry
= readdir (dir
)) != NULL
)
4371 fd
= atoi (entry
->d_name
);
4375 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4376 if (stat (path
, &st
) != 0)
4378 if (!S_ISDIR (st
.st_mode
))
4381 if (statfs (path
, &stfs
) != 0)
4383 if (stfs
.f_type
!= SPUFS_MAGIC
)
4386 callback (data
, fd
);
4392 /* Generate corefile notes for SPU contexts. */
4394 struct linux_spu_corefile_data
4402 linux_spu_corefile_callback (void *data
, int fd
)
4404 struct linux_spu_corefile_data
*args
= data
;
4407 static const char *spu_files
[] =
4429 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4431 char annex
[32], note_name
[32];
4435 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4436 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4440 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4441 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4442 args
->note_size
, note_name
,
4443 NT_SPU
, spu_data
, spu_len
);
4450 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4452 struct linux_spu_corefile_data args
;
4455 args
.note_data
= note_data
;
4456 args
.note_size
= note_size
;
4458 iterate_over_spus (PIDGET (inferior_ptid
),
4459 linux_spu_corefile_callback
, &args
);
4461 return args
.note_data
;
4464 /* Fills the "to_make_corefile_note" target vector. Builds the note
4465 section for a corefile, and returns it in a malloc buffer. */
4468 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4470 struct linux_nat_corefile_thread_data thread_args
;
4471 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4472 char fname
[16] = { '\0' };
4473 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4474 char psargs
[80] = { '\0' };
4475 char *note_data
= NULL
;
4476 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4480 if (get_exec_file (0))
4482 strncpy (fname
, lbasename (get_exec_file (0)), sizeof (fname
));
4483 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4484 if (get_inferior_args ())
4487 char *psargs_end
= psargs
+ sizeof (psargs
);
4489 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4491 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4492 if (string_end
!= NULL
)
4494 *string_end
++ = ' ';
4495 strncpy (string_end
, get_inferior_args (),
4496 psargs_end
- string_end
);
4499 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4501 note_size
, fname
, psargs
);
4504 /* Dump information for threads. */
4505 thread_args
.obfd
= obfd
;
4506 thread_args
.note_data
= note_data
;
4507 thread_args
.note_size
= note_size
;
4508 thread_args
.num_notes
= 0;
4509 thread_args
.stop_signal
= find_stop_signal ();
4510 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4511 gdb_assert (thread_args
.num_notes
!= 0);
4512 note_data
= thread_args
.note_data
;
4514 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4518 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4519 "CORE", NT_AUXV
, auxv
, auxv_len
);
4523 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4525 make_cleanup (xfree
, note_data
);
4529 /* Implement the "info proc" command. */
4532 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4534 /* A long is used for pid instead of an int to avoid a loss of precision
4535 compiler warning from the output of strtoul. */
4536 long pid
= PIDGET (inferior_ptid
);
4539 char buffer
[MAXPATHLEN
];
4540 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4552 /* Break up 'args' into an argv array. */
4553 argv
= gdb_buildargv (args
);
4554 make_cleanup_freeargv (argv
);
4556 while (argv
!= NULL
&& *argv
!= NULL
)
4558 if (isdigit (argv
[0][0]))
4560 pid
= strtoul (argv
[0], NULL
, 10);
4562 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4566 else if (strcmp (argv
[0], "status") == 0)
4570 else if (strcmp (argv
[0], "stat") == 0)
4574 else if (strcmp (argv
[0], "cmd") == 0)
4578 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4582 else if (strcmp (argv
[0], "cwd") == 0)
4586 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4592 /* [...] (future options here). */
4597 error (_("No current process: you must name one."));
4599 sprintf (fname1
, "/proc/%ld", pid
);
4600 if (stat (fname1
, &dummy
) != 0)
4601 error (_("No /proc directory: '%s'"), fname1
);
4603 printf_filtered (_("process %ld\n"), pid
);
4604 if (cmdline_f
|| all
)
4606 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4607 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4609 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4611 if (fgets (buffer
, sizeof (buffer
), procfile
))
4612 printf_filtered ("cmdline = '%s'\n", buffer
);
4614 warning (_("unable to read '%s'"), fname1
);
4615 do_cleanups (cleanup
);
4618 warning (_("unable to open /proc file '%s'"), fname1
);
4622 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4623 memset (fname2
, 0, sizeof (fname2
));
4624 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4625 printf_filtered ("cwd = '%s'\n", fname2
);
4627 warning (_("unable to read link '%s'"), fname1
);
4631 sprintf (fname1
, "/proc/%ld/exe", pid
);
4632 memset (fname2
, 0, sizeof (fname2
));
4633 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4634 printf_filtered ("exe = '%s'\n", fname2
);
4636 warning (_("unable to read link '%s'"), fname1
);
4638 if (mappings_f
|| all
)
4640 sprintf (fname1
, "/proc/%ld/maps", pid
);
4641 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4643 long long addr
, endaddr
, size
, offset
, inode
;
4644 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4645 struct cleanup
*cleanup
;
4647 cleanup
= make_cleanup_fclose (procfile
);
4648 printf_filtered (_("Mapped address spaces:\n\n"));
4649 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4651 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4654 " Size", " Offset", "objfile");
4658 printf_filtered (" %18s %18s %10s %10s %7s\n",
4661 " Size", " Offset", "objfile");
4664 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4665 &offset
, &device
[0], &inode
, &filename
[0]))
4667 size
= endaddr
- addr
;
4669 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4670 calls here (and possibly above) should be abstracted
4671 out into their own functions? Andrew suggests using
4672 a generic local_address_string instead to print out
4673 the addresses; that makes sense to me, too. */
4675 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4677 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4678 (unsigned long) addr
, /* FIXME: pr_addr */
4679 (unsigned long) endaddr
,
4681 (unsigned int) offset
,
4682 filename
[0] ? filename
: "");
4686 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4687 (unsigned long) addr
, /* FIXME: pr_addr */
4688 (unsigned long) endaddr
,
4690 (unsigned int) offset
,
4691 filename
[0] ? filename
: "");
4695 do_cleanups (cleanup
);
4698 warning (_("unable to open /proc file '%s'"), fname1
);
4700 if (status_f
|| all
)
4702 sprintf (fname1
, "/proc/%ld/status", pid
);
4703 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4705 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4707 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4708 puts_filtered (buffer
);
4709 do_cleanups (cleanup
);
4712 warning (_("unable to open /proc file '%s'"), fname1
);
4716 sprintf (fname1
, "/proc/%ld/stat", pid
);
4717 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4722 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4724 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4725 printf_filtered (_("Process: %d\n"), itmp
);
4726 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4727 printf_filtered (_("Exec file: %s\n"), buffer
);
4728 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4729 printf_filtered (_("State: %c\n"), ctmp
);
4730 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4731 printf_filtered (_("Parent process: %d\n"), itmp
);
4732 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4733 printf_filtered (_("Process group: %d\n"), itmp
);
4734 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4735 printf_filtered (_("Session id: %d\n"), itmp
);
4736 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4737 printf_filtered (_("TTY: %d\n"), itmp
);
4738 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4739 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4740 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4741 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4742 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4743 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4744 (unsigned long) ltmp
);
4745 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4746 printf_filtered (_("Minor faults, children: %lu\n"),
4747 (unsigned long) ltmp
);
4748 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4749 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4750 (unsigned long) ltmp
);
4751 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4752 printf_filtered (_("Major faults, children: %lu\n"),
4753 (unsigned long) ltmp
);
4754 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4755 printf_filtered (_("utime: %ld\n"), ltmp
);
4756 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4757 printf_filtered (_("stime: %ld\n"), ltmp
);
4758 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4759 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4760 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4761 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4762 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4763 printf_filtered (_("jiffies remaining in current "
4764 "time slice: %ld\n"), ltmp
);
4765 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4766 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4767 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4768 printf_filtered (_("jiffies until next timeout: %lu\n"),
4769 (unsigned long) ltmp
);
4770 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4771 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4772 (unsigned long) ltmp
);
4773 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4774 printf_filtered (_("start time (jiffies since "
4775 "system boot): %ld\n"), ltmp
);
4776 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4777 printf_filtered (_("Virtual memory size: %lu\n"),
4778 (unsigned long) ltmp
);
4779 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4780 printf_filtered (_("Resident set size: %lu\n"),
4781 (unsigned long) ltmp
);
4782 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4783 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4784 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4785 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4786 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4787 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4788 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4789 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4790 #if 0 /* Don't know how architecture-dependent the rest is...
4791 Anyway the signal bitmap info is available from "status". */
4792 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4793 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4794 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4795 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4796 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4797 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4798 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4799 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4800 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4801 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4802 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4803 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4804 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4805 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4807 do_cleanups (cleanup
);
4810 warning (_("unable to open /proc file '%s'"), fname1
);
4814 /* Implement the to_xfer_partial interface for memory reads using the /proc
4815 filesystem. Because we can use a single read() call for /proc, this
4816 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4817 but it doesn't support writes. */
4820 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4821 const char *annex
, gdb_byte
*readbuf
,
4822 const gdb_byte
*writebuf
,
4823 ULONGEST offset
, LONGEST len
)
4829 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4832 /* Don't bother for one word. */
4833 if (len
< 3 * sizeof (long))
4836 /* We could keep this file open and cache it - possibly one per
4837 thread. That requires some juggling, but is even faster. */
4838 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4839 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4843 /* If pread64 is available, use it. It's faster if the kernel
4844 supports it (only one syscall), and it's 64-bit safe even on
4845 32-bit platforms (for instance, SPARC debugging a SPARC64
4848 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4850 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4861 /* Enumerate spufs IDs for process PID. */
4863 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4865 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4867 LONGEST written
= 0;
4870 struct dirent
*entry
;
4872 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4873 dir
= opendir (path
);
4878 while ((entry
= readdir (dir
)) != NULL
)
4884 fd
= atoi (entry
->d_name
);
4888 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4889 if (stat (path
, &st
) != 0)
4891 if (!S_ISDIR (st
.st_mode
))
4894 if (statfs (path
, &stfs
) != 0)
4896 if (stfs
.f_type
!= SPUFS_MAGIC
)
4899 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4901 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4911 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4912 object type, using the /proc file system. */
4914 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4915 const char *annex
, gdb_byte
*readbuf
,
4916 const gdb_byte
*writebuf
,
4917 ULONGEST offset
, LONGEST len
)
4922 int pid
= PIDGET (inferior_ptid
);
4929 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4932 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4933 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4938 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4945 ret
= write (fd
, writebuf
, (size_t) len
);
4947 ret
= read (fd
, readbuf
, (size_t) len
);
4954 /* Parse LINE as a signal set and add its set bits to SIGS. */
4957 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4959 int len
= strlen (line
) - 1;
4963 if (line
[len
] != '\n')
4964 error (_("Could not parse signal set: %s"), line
);
4972 if (*p
>= '0' && *p
<= '9')
4974 else if (*p
>= 'a' && *p
<= 'f')
4975 digit
= *p
- 'a' + 10;
4977 error (_("Could not parse signal set: %s"), line
);
4982 sigaddset (sigs
, signum
+ 1);
4984 sigaddset (sigs
, signum
+ 2);
4986 sigaddset (sigs
, signum
+ 3);
4988 sigaddset (sigs
, signum
+ 4);
4994 /* Find process PID's pending signals from /proc/pid/status and set
4998 linux_proc_pending_signals (int pid
, sigset_t
*pending
,
4999 sigset_t
*blocked
, sigset_t
*ignored
)
5002 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
5003 struct cleanup
*cleanup
;
5005 sigemptyset (pending
);
5006 sigemptyset (blocked
);
5007 sigemptyset (ignored
);
5008 sprintf (fname
, "/proc/%d/status", pid
);
5009 procfile
= fopen (fname
, "r");
5010 if (procfile
== NULL
)
5011 error (_("Could not open %s"), fname
);
5012 cleanup
= make_cleanup_fclose (procfile
);
5014 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
5016 /* Normal queued signals are on the SigPnd line in the status
5017 file. However, 2.6 kernels also have a "shared" pending
5018 queue for delivering signals to a thread group, so check for
5021 Unfortunately some Red Hat kernels include the shared pending
5022 queue but not the ShdPnd status field. */
5024 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
5025 add_line_to_sigset (buffer
+ 8, pending
);
5026 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
5027 add_line_to_sigset (buffer
+ 8, pending
);
5028 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
5029 add_line_to_sigset (buffer
+ 8, blocked
);
5030 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
5031 add_line_to_sigset (buffer
+ 8, ignored
);
5034 do_cleanups (cleanup
);
5038 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
5039 const char *annex
, gdb_byte
*readbuf
,
5040 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5042 /* We make the process list snapshot when the object starts to be
5044 static const char *buf
;
5045 static LONGEST len_avail
= -1;
5046 static struct obstack obstack
;
5050 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
5056 if (len_avail
!= -1 && len_avail
!= 0)
5057 obstack_free (&obstack
, NULL
);
5060 obstack_init (&obstack
);
5061 obstack_grow_str (&obstack
, "<osdata type=\"types\">\n");
5063 obstack_xml_printf (&obstack
,
5065 "<column name=\"Type\">processes</column>"
5066 "<column name=\"Description\">"
5067 "Listing of all processes</column>"
5070 obstack_grow_str0 (&obstack
, "</osdata>\n");
5071 buf
= obstack_finish (&obstack
);
5072 len_avail
= strlen (buf
);
5075 if (offset
>= len_avail
)
5077 /* Done. Get rid of the obstack. */
5078 obstack_free (&obstack
, NULL
);
5084 if (len
> len_avail
- offset
)
5085 len
= len_avail
- offset
;
5086 memcpy (readbuf
, buf
+ offset
, len
);
5091 if (strcmp (annex
, "processes") != 0)
5094 gdb_assert (readbuf
&& !writebuf
);
5098 if (len_avail
!= -1 && len_avail
!= 0)
5099 obstack_free (&obstack
, NULL
);
5102 obstack_init (&obstack
);
5103 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
5105 dirp
= opendir ("/proc");
5110 while ((dp
= readdir (dirp
)) != NULL
)
5112 struct stat statbuf
;
5113 char procentry
[sizeof ("/proc/4294967295")];
5115 if (!isdigit (dp
->d_name
[0])
5116 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
5119 sprintf (procentry
, "/proc/%s", dp
->d_name
);
5120 if (stat (procentry
, &statbuf
) == 0
5121 && S_ISDIR (statbuf
.st_mode
))
5125 char cmd
[MAXPATHLEN
+ 1];
5126 struct passwd
*entry
;
5128 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
5129 entry
= getpwuid (statbuf
.st_uid
);
5131 if ((f
= fopen (pathname
, "r")) != NULL
)
5133 size_t length
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
5139 for (i
= 0; i
< length
; i
++)
5144 obstack_xml_printf (
5147 "<column name=\"pid\">%s</column>"
5148 "<column name=\"user\">%s</column>"
5149 "<column name=\"command\">%s</column>"
5152 entry
? entry
->pw_name
: "?",
5165 obstack_grow_str0 (&obstack
, "</osdata>\n");
5166 buf
= obstack_finish (&obstack
);
5167 len_avail
= strlen (buf
);
5170 if (offset
>= len_avail
)
5172 /* Done. Get rid of the obstack. */
5173 obstack_free (&obstack
, NULL
);
5179 if (len
> len_avail
- offset
)
5180 len
= len_avail
- offset
;
5181 memcpy (readbuf
, buf
+ offset
, len
);
5187 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5188 const char *annex
, gdb_byte
*readbuf
,
5189 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5193 if (object
== TARGET_OBJECT_AUXV
)
5194 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5197 if (object
== TARGET_OBJECT_OSDATA
)
5198 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5201 if (object
== TARGET_OBJECT_SPU
)
5202 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5205 /* GDB calculates all the addresses in possibly larget width of the address.
5206 Address width needs to be masked before its final use - either by
5207 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5209 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5211 if (object
== TARGET_OBJECT_MEMORY
)
5213 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5215 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5216 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5219 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5224 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5228 /* Create a prototype generic GNU/Linux target. The client can override
5229 it with local methods. */
5232 linux_target_install_ops (struct target_ops
*t
)
5234 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5235 t
->to_remove_fork_catchpoint
= linux_child_remove_fork_catchpoint
;
5236 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5237 t
->to_remove_vfork_catchpoint
= linux_child_remove_vfork_catchpoint
;
5238 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5239 t
->to_remove_exec_catchpoint
= linux_child_remove_exec_catchpoint
;
5240 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5241 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5242 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5243 t
->to_post_attach
= linux_child_post_attach
;
5244 t
->to_follow_fork
= linux_child_follow_fork
;
5245 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5246 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5248 super_xfer_partial
= t
->to_xfer_partial
;
5249 t
->to_xfer_partial
= linux_xfer_partial
;
5255 struct target_ops
*t
;
5257 t
= inf_ptrace_target ();
5258 linux_target_install_ops (t
);
5264 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5266 struct target_ops
*t
;
5268 t
= inf_ptrace_trad_target (register_u_offset
);
5269 linux_target_install_ops (t
);
5274 /* target_is_async_p implementation. */
5277 linux_nat_is_async_p (void)
5279 /* NOTE: palves 2008-03-21: We're only async when the user requests
5280 it explicitly with the "set target-async" command.
5281 Someday, linux will always be async. */
5282 if (!target_async_permitted
)
5285 /* See target.h/target_async_mask. */
5286 return linux_nat_async_mask_value
;
5289 /* target_can_async_p implementation. */
5292 linux_nat_can_async_p (void)
5294 /* NOTE: palves 2008-03-21: We're only async when the user requests
5295 it explicitly with the "set target-async" command.
5296 Someday, linux will always be async. */
5297 if (!target_async_permitted
)
5300 /* See target.h/target_async_mask. */
5301 return linux_nat_async_mask_value
;
5305 linux_nat_supports_non_stop (void)
5310 /* True if we want to support multi-process. To be removed when GDB
5311 supports multi-exec. */
5313 int linux_multi_process
= 1;
5316 linux_nat_supports_multi_process (void)
5318 return linux_multi_process
;
5321 /* target_async_mask implementation. */
5324 linux_nat_async_mask (int new_mask
)
5326 int curr_mask
= linux_nat_async_mask_value
;
5328 if (curr_mask
!= new_mask
)
5332 linux_nat_async (NULL
, 0);
5333 linux_nat_async_mask_value
= new_mask
;
5337 linux_nat_async_mask_value
= new_mask
;
5339 /* If we're going out of async-mask in all-stop, then the
5340 inferior is stopped. The next resume will call
5341 target_async. In non-stop, the target event source
5342 should be always registered in the event loop. Do so
5345 linux_nat_async (inferior_event_handler
, 0);
5352 static int async_terminal_is_ours
= 1;
5354 /* target_terminal_inferior implementation. */
5357 linux_nat_terminal_inferior (void)
5359 if (!target_is_async_p ())
5361 /* Async mode is disabled. */
5362 terminal_inferior ();
5366 terminal_inferior ();
5368 /* Calls to target_terminal_*() are meant to be idempotent. */
5369 if (!async_terminal_is_ours
)
5372 delete_file_handler (input_fd
);
5373 async_terminal_is_ours
= 0;
5377 /* target_terminal_ours implementation. */
5380 linux_nat_terminal_ours (void)
5382 if (!target_is_async_p ())
5384 /* Async mode is disabled. */
5389 /* GDB should never give the terminal to the inferior if the
5390 inferior is running in the background (run&, continue&, etc.),
5391 but claiming it sure should. */
5394 if (async_terminal_is_ours
)
5397 clear_sigint_trap ();
5398 add_file_handler (input_fd
, stdin_event_handler
, 0);
5399 async_terminal_is_ours
= 1;
5402 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5404 static void *async_client_context
;
5406 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5407 so we notice when any child changes state, and notify the
5408 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5409 above to wait for the arrival of a SIGCHLD. */
5412 sigchld_handler (int signo
)
5414 int old_errno
= errno
;
5416 if (debug_linux_nat_async
)
5417 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5419 if (signo
== SIGCHLD
5420 && linux_nat_event_pipe
[0] != -1)
5421 async_file_mark (); /* Let the event loop know that there are
5422 events to handle. */
5427 /* Callback registered with the target events file descriptor. */
5430 handle_target_event (int error
, gdb_client_data client_data
)
5432 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5435 /* Create/destroy the target events pipe. Returns previous state. */
5438 linux_async_pipe (int enable
)
5440 int previous
= (linux_nat_event_pipe
[0] != -1);
5442 if (previous
!= enable
)
5446 block_child_signals (&prev_mask
);
5450 if (pipe (linux_nat_event_pipe
) == -1)
5451 internal_error (__FILE__
, __LINE__
,
5452 "creating event pipe failed.");
5454 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5455 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5459 close (linux_nat_event_pipe
[0]);
5460 close (linux_nat_event_pipe
[1]);
5461 linux_nat_event_pipe
[0] = -1;
5462 linux_nat_event_pipe
[1] = -1;
5465 restore_child_signals_mask (&prev_mask
);
5471 /* target_async implementation. */
5474 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5475 void *context
), void *context
)
5477 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5478 internal_error (__FILE__
, __LINE__
,
5479 "Calling target_async when async is masked");
5481 if (callback
!= NULL
)
5483 async_client_callback
= callback
;
5484 async_client_context
= context
;
5485 if (!linux_async_pipe (1))
5487 add_file_handler (linux_nat_event_pipe
[0],
5488 handle_target_event
, NULL
);
5489 /* There may be pending events to handle. Tell the event loop
5496 async_client_callback
= callback
;
5497 async_client_context
= context
;
5498 delete_file_handler (linux_nat_event_pipe
[0]);
5499 linux_async_pipe (0);
5504 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5508 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5512 ptid_t ptid
= lwp
->ptid
;
5514 if (debug_linux_nat
)
5515 fprintf_unfiltered (gdb_stdlog
,
5516 "LNSL: running -> suspending %s\n",
5517 target_pid_to_str (lwp
->ptid
));
5520 stop_callback (lwp
, NULL
);
5521 stop_wait_callback (lwp
, NULL
);
5523 /* If the lwp exits while we try to stop it, there's nothing
5525 lwp
= find_lwp_pid (ptid
);
5529 /* If we didn't collect any signal other than SIGSTOP while
5530 stopping the LWP, push a SIGNAL_0 event. In either case, the
5531 event-loop will end up calling target_wait which will collect
5533 if (lwp
->status
== 0)
5534 lwp
->status
= W_STOPCODE (0);
5539 /* Already known to be stopped; do nothing. */
5541 if (debug_linux_nat
)
5543 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5544 fprintf_unfiltered (gdb_stdlog
,
5545 "LNSL: already stopped/stop_requested %s\n",
5546 target_pid_to_str (lwp
->ptid
));
5548 fprintf_unfiltered (gdb_stdlog
,
5549 "LNSL: already stopped/no "
5550 "stop_requested yet %s\n",
5551 target_pid_to_str (lwp
->ptid
));
5558 linux_nat_stop (ptid_t ptid
)
5561 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5563 linux_ops
->to_stop (ptid
);
5567 linux_nat_close (int quitting
)
5569 /* Unregister from the event loop. */
5570 if (target_is_async_p ())
5571 target_async (NULL
, 0);
5573 /* Reset the async_masking. */
5574 linux_nat_async_mask_value
= 1;
5576 if (linux_ops
->to_close
)
5577 linux_ops
->to_close (quitting
);
5580 /* When requests are passed down from the linux-nat layer to the
5581 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5582 used. The address space pointer is stored in the inferior object,
5583 but the common code that is passed such ptid can't tell whether
5584 lwpid is a "main" process id or not (it assumes so). We reverse
5585 look up the "main" process id from the lwp here. */
5587 struct address_space
*
5588 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5590 struct lwp_info
*lwp
;
5591 struct inferior
*inf
;
5594 pid
= GET_LWP (ptid
);
5595 if (GET_LWP (ptid
) == 0)
5597 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5599 lwp
= find_lwp_pid (ptid
);
5600 pid
= GET_PID (lwp
->ptid
);
5604 /* A (pid,lwpid,0) ptid. */
5605 pid
= GET_PID (ptid
);
5608 inf
= find_inferior_pid (pid
);
5609 gdb_assert (inf
!= NULL
);
5614 linux_nat_core_of_thread_1 (ptid_t ptid
)
5616 struct cleanup
*back_to
;
5619 char *content
= NULL
;
5622 int content_read
= 0;
5626 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5627 GET_PID (ptid
), GET_LWP (ptid
));
5628 back_to
= make_cleanup (xfree
, filename
);
5630 f
= fopen (filename
, "r");
5633 do_cleanups (back_to
);
5637 make_cleanup_fclose (f
);
5643 content
= xrealloc (content
, content_read
+ 1024);
5644 n
= fread (content
+ content_read
, 1, 1024, f
);
5648 content
[content_read
] = '\0';
5653 make_cleanup (xfree
, content
);
5655 p
= strchr (content
, '(');
5659 p
= strchr (p
, ')');
5663 /* If the first field after program name has index 0, then core number is
5664 the field with index 36. There's no constant for that anywhere. */
5666 p
= strtok_r (p
, " ", &ts
);
5667 for (i
= 0; p
!= NULL
&& i
!= 36; ++i
)
5668 p
= strtok_r (NULL
, " ", &ts
);
5670 if (p
== NULL
|| sscanf (p
, "%d", &core
) == 0)
5673 do_cleanups (back_to
);
5678 /* Return the cached value of the processor core for thread PTID. */
5681 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5683 struct lwp_info
*info
= find_lwp_pid (ptid
);
5691 linux_nat_add_target (struct target_ops
*t
)
5693 /* Save the provided single-threaded target. We save this in a separate
5694 variable because another target we've inherited from (e.g. inf-ptrace)
5695 may have saved a pointer to T; we want to use it for the final
5696 process stratum target. */
5697 linux_ops_saved
= *t
;
5698 linux_ops
= &linux_ops_saved
;
5700 /* Override some methods for multithreading. */
5701 t
->to_create_inferior
= linux_nat_create_inferior
;
5702 t
->to_attach
= linux_nat_attach
;
5703 t
->to_detach
= linux_nat_detach
;
5704 t
->to_resume
= linux_nat_resume
;
5705 t
->to_wait
= linux_nat_wait
;
5706 t
->to_pass_signals
= linux_nat_pass_signals
;
5707 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5708 t
->to_kill
= linux_nat_kill
;
5709 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5710 t
->to_thread_alive
= linux_nat_thread_alive
;
5711 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5712 t
->to_thread_name
= linux_nat_thread_name
;
5713 t
->to_has_thread_control
= tc_schedlock
;
5714 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5715 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5716 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5718 t
->to_can_async_p
= linux_nat_can_async_p
;
5719 t
->to_is_async_p
= linux_nat_is_async_p
;
5720 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5721 t
->to_async
= linux_nat_async
;
5722 t
->to_async_mask
= linux_nat_async_mask
;
5723 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5724 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5725 t
->to_close
= linux_nat_close
;
5727 /* Methods for non-stop support. */
5728 t
->to_stop
= linux_nat_stop
;
5730 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5732 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5734 /* We don't change the stratum; this target will sit at
5735 process_stratum and thread_db will set at thread_stratum. This
5736 is a little strange, since this is a multi-threaded-capable
5737 target, but we want to be on the stack below thread_db, and we
5738 also want to be used for single-threaded processes. */
5743 /* Register a method to call whenever a new thread is attached. */
5745 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5747 /* Save the pointer. We only support a single registered instance
5748 of the GNU/Linux native target, so we do not need to map this to
5750 linux_nat_new_thread
= new_thread
;
5753 /* Register a method that converts a siginfo object between the layout
5754 that ptrace returns, and the layout in the architecture of the
5757 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5758 int (*siginfo_fixup
) (struct siginfo
*,
5762 /* Save the pointer. */
5763 linux_nat_siginfo_fixup
= siginfo_fixup
;
5766 /* Return the saved siginfo associated with PTID. */
5768 linux_nat_get_siginfo (ptid_t ptid
)
5770 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5772 gdb_assert (lp
!= NULL
);
5774 return &lp
->siginfo
;
5777 /* Provide a prototype to silence -Wmissing-prototypes. */
5778 extern initialize_file_ftype _initialize_linux_nat
;
5781 _initialize_linux_nat (void)
5783 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5784 Show /proc process information about any running process.\n\
5785 Specify any process id, or use the program being debugged by default.\n\
5786 Specify any of the following keywords for detailed info:\n\
5787 mappings -- list of mapped memory regions.\n\
5788 stat -- list a bunch of random process info.\n\
5789 status -- list a different bunch of random process info.\n\
5790 all -- list all available /proc info."));
5792 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5793 &debug_linux_nat
, _("\
5794 Set debugging of GNU/Linux lwp module."), _("\
5795 Show debugging of GNU/Linux lwp module."), _("\
5796 Enables printf debugging output."),
5798 show_debug_linux_nat
,
5799 &setdebuglist
, &showdebuglist
);
5801 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5802 &debug_linux_nat_async
, _("\
5803 Set debugging of GNU/Linux async lwp module."), _("\
5804 Show debugging of GNU/Linux async lwp module."), _("\
5805 Enables printf debugging output."),
5807 show_debug_linux_nat_async
,
5808 &setdebuglist
, &showdebuglist
);
5810 /* Save this mask as the default. */
5811 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5813 /* Install a SIGCHLD handler. */
5814 sigchld_action
.sa_handler
= sigchld_handler
;
5815 sigemptyset (&sigchld_action
.sa_mask
);
5816 sigchld_action
.sa_flags
= SA_RESTART
;
5818 /* Make it the default. */
5819 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5821 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5822 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5823 sigdelset (&suspend_mask
, SIGCHLD
);
5825 sigemptyset (&blocked_mask
);
5827 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5828 &disable_randomization
, _("\
5829 Set disabling of debuggee's virtual address space randomization."), _("\
5830 Show disabling of debuggee's virtual address space randomization."), _("\
5831 When this mode is on (which is the default), randomization of the virtual\n\
5832 address space is disabled. Standalone programs run with the randomization\n\
5833 enabled by default on some platforms."),
5834 &set_disable_randomization
,
5835 &show_disable_randomization
,
5836 &setlist
, &showlist
);
5840 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5841 the GNU/Linux Threads library and therefore doesn't really belong
5844 /* Read variable NAME in the target and return its value if found.
5845 Otherwise return zero. It is assumed that the type of the variable
5849 get_signo (const char *name
)
5851 struct minimal_symbol
*ms
;
5854 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5858 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5859 sizeof (signo
)) != 0)
5865 /* Return the set of signals used by the threads library in *SET. */
5868 lin_thread_get_thread_signals (sigset_t
*set
)
5870 struct sigaction action
;
5871 int restart
, cancel
;
5873 sigemptyset (&blocked_mask
);
5876 restart
= get_signo ("__pthread_sig_restart");
5877 cancel
= get_signo ("__pthread_sig_cancel");
5879 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5880 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5881 not provide any way for the debugger to query the signal numbers -
5882 fortunately they don't change! */
5885 restart
= __SIGRTMIN
;
5888 cancel
= __SIGRTMIN
+ 1;
5890 sigaddset (set
, restart
);
5891 sigaddset (set
, cancel
);
5893 /* The GNU/Linux Threads library makes terminating threads send a
5894 special "cancel" signal instead of SIGCHLD. Make sure we catch
5895 those (to prevent them from terminating GDB itself, which is
5896 likely to be their default action) and treat them the same way as
5899 action
.sa_handler
= sigchld_handler
;
5900 sigemptyset (&action
.sa_mask
);
5901 action
.sa_flags
= SA_RESTART
;
5902 sigaction (cancel
, &action
, NULL
);
5904 /* We block the "cancel" signal throughout this code ... */
5905 sigaddset (&blocked_mask
, cancel
);
5906 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5908 /* ... except during a sigsuspend. */
5909 sigdelset (&suspend_mask
, cancel
);