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_insert_vfork_catchpoint (int pid
)
949 return !linux_supports_tracefork (pid
);
953 linux_child_insert_exec_catchpoint (int pid
)
955 return !linux_supports_tracefork (pid
);
959 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
960 int table_size
, int *table
)
962 if (!linux_supports_tracesysgood (pid
))
965 /* On GNU/Linux, we ignore the arguments. It means that we only
966 enable the syscall catchpoints, but do not disable them.
968 Also, we do not use the `table' information because we do not
969 filter system calls here. We let GDB do the logic for us. */
973 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
974 are processes sharing the same VM space. A multi-threaded process
975 is basically a group of such processes. However, such a grouping
976 is almost entirely a user-space issue; the kernel doesn't enforce
977 such a grouping at all (this might change in the future). In
978 general, we'll rely on the threads library (i.e. the GNU/Linux
979 Threads library) to provide such a grouping.
981 It is perfectly well possible to write a multi-threaded application
982 without the assistance of a threads library, by using the clone
983 system call directly. This module should be able to give some
984 rudimentary support for debugging such applications if developers
985 specify the CLONE_PTRACE flag in the clone system call, and are
986 using the Linux kernel 2.4 or above.
988 Note that there are some peculiarities in GNU/Linux that affect
991 - In general one should specify the __WCLONE flag to waitpid in
992 order to make it report events for any of the cloned processes
993 (and leave it out for the initial process). However, if a cloned
994 process has exited the exit status is only reported if the
995 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
996 we cannot use it since GDB must work on older systems too.
998 - When a traced, cloned process exits and is waited for by the
999 debugger, the kernel reassigns it to the original parent and
1000 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1001 library doesn't notice this, which leads to the "zombie problem":
1002 When debugged a multi-threaded process that spawns a lot of
1003 threads will run out of processes, even if the threads exit,
1004 because the "zombies" stay around. */
1006 /* List of known LWPs. */
1007 struct lwp_info
*lwp_list
;
1010 /* Original signal mask. */
1011 static sigset_t normal_mask
;
1013 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1014 _initialize_linux_nat. */
1015 static sigset_t suspend_mask
;
1017 /* Signals to block to make that sigsuspend work. */
1018 static sigset_t blocked_mask
;
1020 /* SIGCHLD action. */
1021 struct sigaction sigchld_action
;
1023 /* Block child signals (SIGCHLD and linux threads signals), and store
1024 the previous mask in PREV_MASK. */
1027 block_child_signals (sigset_t
*prev_mask
)
1029 /* Make sure SIGCHLD is blocked. */
1030 if (!sigismember (&blocked_mask
, SIGCHLD
))
1031 sigaddset (&blocked_mask
, SIGCHLD
);
1033 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1036 /* Restore child signals mask, previously returned by
1037 block_child_signals. */
1040 restore_child_signals_mask (sigset_t
*prev_mask
)
1042 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1046 /* Prototypes for local functions. */
1047 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1048 static int linux_thread_alive (ptid_t ptid
);
1049 static char *linux_child_pid_to_exec_file (int pid
);
1052 /* Convert wait status STATUS to a string. Used for printing debug
1056 status_to_str (int status
)
1058 static char buf
[64];
1060 if (WIFSTOPPED (status
))
1062 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1063 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1064 strsignal (SIGTRAP
));
1066 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1067 strsignal (WSTOPSIG (status
)));
1069 else if (WIFSIGNALED (status
))
1070 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1071 strsignal (WTERMSIG (status
)));
1073 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1078 /* Remove all LWPs belong to PID from the lwp list. */
1081 purge_lwp_list (int pid
)
1083 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1087 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1091 if (ptid_get_pid (lp
->ptid
) == pid
)
1094 lwp_list
= lp
->next
;
1096 lpprev
->next
= lp
->next
;
1105 /* Return the number of known LWPs in the tgid given by PID. */
1111 struct lwp_info
*lp
;
1113 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1114 if (ptid_get_pid (lp
->ptid
) == pid
)
1120 /* Add the LWP specified by PID to the list. Return a pointer to the
1121 structure describing the new LWP. The LWP should already be stopped
1122 (with an exception for the very first LWP). */
1124 static struct lwp_info
*
1125 add_lwp (ptid_t ptid
)
1127 struct lwp_info
*lp
;
1129 gdb_assert (is_lwp (ptid
));
1131 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1133 memset (lp
, 0, sizeof (struct lwp_info
));
1135 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1140 lp
->next
= lwp_list
;
1143 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1144 linux_nat_new_thread (ptid
);
1149 /* Remove the LWP specified by PID from the list. */
1152 delete_lwp (ptid_t ptid
)
1154 struct lwp_info
*lp
, *lpprev
;
1158 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1159 if (ptid_equal (lp
->ptid
, ptid
))
1166 lpprev
->next
= lp
->next
;
1168 lwp_list
= lp
->next
;
1173 /* Return a pointer to the structure describing the LWP corresponding
1174 to PID. If no corresponding LWP could be found, return NULL. */
1176 static struct lwp_info
*
1177 find_lwp_pid (ptid_t ptid
)
1179 struct lwp_info
*lp
;
1183 lwp
= GET_LWP (ptid
);
1185 lwp
= GET_PID (ptid
);
1187 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1188 if (lwp
== GET_LWP (lp
->ptid
))
1194 /* Call CALLBACK with its second argument set to DATA for every LWP in
1195 the list. If CALLBACK returns 1 for a particular LWP, return a
1196 pointer to the structure describing that LWP immediately.
1197 Otherwise return NULL. */
1200 iterate_over_lwps (ptid_t filter
,
1201 int (*callback
) (struct lwp_info
*, void *),
1204 struct lwp_info
*lp
, *lpnext
;
1206 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1210 if (ptid_match (lp
->ptid
, filter
))
1212 if ((*callback
) (lp
, data
))
1220 /* Update our internal state when changing from one checkpoint to
1221 another indicated by NEW_PTID. We can only switch single-threaded
1222 applications, so we only create one new LWP, and the previous list
1226 linux_nat_switch_fork (ptid_t new_ptid
)
1228 struct lwp_info
*lp
;
1230 purge_lwp_list (GET_PID (inferior_ptid
));
1232 lp
= add_lwp (new_ptid
);
1235 /* This changes the thread's ptid while preserving the gdb thread
1236 num. Also changes the inferior pid, while preserving the
1238 thread_change_ptid (inferior_ptid
, new_ptid
);
1240 /* We've just told GDB core that the thread changed target id, but,
1241 in fact, it really is a different thread, with different register
1243 registers_changed ();
1246 /* Handle the exit of a single thread LP. */
1249 exit_lwp (struct lwp_info
*lp
)
1251 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1255 if (print_thread_events
)
1256 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1258 delete_thread (lp
->ptid
);
1261 delete_lwp (lp
->ptid
);
1264 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1267 linux_proc_get_tgid (int lwpid
)
1273 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1274 status_file
= fopen (buf
, "r");
1275 if (status_file
!= NULL
)
1277 while (fgets (buf
, sizeof (buf
), status_file
))
1279 if (strncmp (buf
, "Tgid:", 5) == 0)
1281 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1286 fclose (status_file
);
1292 /* Detect `T (stopped)' in `/proc/PID/status'.
1293 Other states including `T (tracing stop)' are reported as false. */
1296 pid_is_stopped (pid_t pid
)
1302 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1303 status_file
= fopen (buf
, "r");
1304 if (status_file
!= NULL
)
1308 while (fgets (buf
, sizeof (buf
), status_file
))
1310 if (strncmp (buf
, "State:", 6) == 0)
1316 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1318 fclose (status_file
);
1323 /* Wait for the LWP specified by LP, which we have just attached to.
1324 Returns a wait status for that LWP, to cache. */
1327 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1330 pid_t new_pid
, pid
= GET_LWP (ptid
);
1333 if (pid_is_stopped (pid
))
1335 if (debug_linux_nat
)
1336 fprintf_unfiltered (gdb_stdlog
,
1337 "LNPAW: Attaching to a stopped process\n");
1339 /* The process is definitely stopped. It is in a job control
1340 stop, unless the kernel predates the TASK_STOPPED /
1341 TASK_TRACED distinction, in which case it might be in a
1342 ptrace stop. Make sure it is in a ptrace stop; from there we
1343 can kill it, signal it, et cetera.
1345 First make sure there is a pending SIGSTOP. Since we are
1346 already attached, the process can not transition from stopped
1347 to running without a PTRACE_CONT; so we know this signal will
1348 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1349 probably already in the queue (unless this kernel is old
1350 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1351 is not an RT signal, it can only be queued once. */
1352 kill_lwp (pid
, SIGSTOP
);
1354 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1355 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1356 ptrace (PTRACE_CONT
, pid
, 0, 0);
1359 /* Make sure the initial process is stopped. The user-level threads
1360 layer might want to poke around in the inferior, and that won't
1361 work if things haven't stabilized yet. */
1362 new_pid
= my_waitpid (pid
, &status
, 0);
1363 if (new_pid
== -1 && errno
== ECHILD
)
1366 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1368 /* Try again with __WCLONE to check cloned processes. */
1369 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1373 gdb_assert (pid
== new_pid
);
1375 if (!WIFSTOPPED (status
))
1377 /* The pid we tried to attach has apparently just exited. */
1378 if (debug_linux_nat
)
1379 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1380 pid
, status_to_str (status
));
1384 if (WSTOPSIG (status
) != SIGSTOP
)
1387 if (debug_linux_nat
)
1388 fprintf_unfiltered (gdb_stdlog
,
1389 "LNPAW: Received %s after attaching\n",
1390 status_to_str (status
));
1396 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1397 if the new LWP could not be attached. */
1400 lin_lwp_attach_lwp (ptid_t ptid
)
1402 struct lwp_info
*lp
;
1405 gdb_assert (is_lwp (ptid
));
1407 block_child_signals (&prev_mask
);
1409 lp
= find_lwp_pid (ptid
);
1411 /* We assume that we're already attached to any LWP that has an id
1412 equal to the overall process id, and to any LWP that is already
1413 in our list of LWPs. If we're not seeing exit events from threads
1414 and we've had PID wraparound since we last tried to stop all threads,
1415 this assumption might be wrong; fortunately, this is very unlikely
1417 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1419 int status
, cloned
= 0, signalled
= 0;
1421 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1423 /* If we fail to attach to the thread, issue a warning,
1424 but continue. One way this can happen is if thread
1425 creation is interrupted; as of Linux kernel 2.6.19, a
1426 bug may place threads in the thread list and then fail
1428 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1429 safe_strerror (errno
));
1430 restore_child_signals_mask (&prev_mask
);
1434 if (debug_linux_nat
)
1435 fprintf_unfiltered (gdb_stdlog
,
1436 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1437 target_pid_to_str (ptid
));
1439 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1440 if (!WIFSTOPPED (status
))
1443 lp
= add_lwp (ptid
);
1445 lp
->cloned
= cloned
;
1446 lp
->signalled
= signalled
;
1447 if (WSTOPSIG (status
) != SIGSTOP
)
1450 lp
->status
= status
;
1453 target_post_attach (GET_LWP (lp
->ptid
));
1455 if (debug_linux_nat
)
1457 fprintf_unfiltered (gdb_stdlog
,
1458 "LLAL: waitpid %s received %s\n",
1459 target_pid_to_str (ptid
),
1460 status_to_str (status
));
1465 /* We assume that the LWP representing the original process is
1466 already stopped. Mark it as stopped in the data structure
1467 that the GNU/linux ptrace layer uses to keep track of
1468 threads. Note that this won't have already been done since
1469 the main thread will have, we assume, been stopped by an
1470 attach from a different layer. */
1472 lp
= add_lwp (ptid
);
1476 restore_child_signals_mask (&prev_mask
);
1481 linux_nat_create_inferior (struct target_ops
*ops
,
1482 char *exec_file
, char *allargs
, char **env
,
1485 #ifdef HAVE_PERSONALITY
1486 int personality_orig
= 0, personality_set
= 0;
1487 #endif /* HAVE_PERSONALITY */
1489 /* The fork_child mechanism is synchronous and calls target_wait, so
1490 we have to mask the async mode. */
1492 #ifdef HAVE_PERSONALITY
1493 if (disable_randomization
)
1496 personality_orig
= personality (0xffffffff);
1497 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1499 personality_set
= 1;
1500 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1502 if (errno
!= 0 || (personality_set
1503 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1504 warning (_("Error disabling address space randomization: %s"),
1505 safe_strerror (errno
));
1507 #endif /* HAVE_PERSONALITY */
1509 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1511 #ifdef HAVE_PERSONALITY
1512 if (personality_set
)
1515 personality (personality_orig
);
1517 warning (_("Error restoring address space randomization: %s"),
1518 safe_strerror (errno
));
1520 #endif /* HAVE_PERSONALITY */
1524 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1526 struct lwp_info
*lp
;
1530 linux_ops
->to_attach (ops
, args
, from_tty
);
1532 /* The ptrace base target adds the main thread with (pid,0,0)
1533 format. Decorate it with lwp info. */
1534 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1535 thread_change_ptid (inferior_ptid
, ptid
);
1537 /* Add the initial process as the first LWP to the list. */
1538 lp
= add_lwp (ptid
);
1540 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1542 if (!WIFSTOPPED (status
))
1544 if (WIFEXITED (status
))
1546 int exit_code
= WEXITSTATUS (status
);
1548 target_terminal_ours ();
1549 target_mourn_inferior ();
1551 error (_("Unable to attach: program exited normally."));
1553 error (_("Unable to attach: program exited with code %d."),
1556 else if (WIFSIGNALED (status
))
1558 enum target_signal signo
;
1560 target_terminal_ours ();
1561 target_mourn_inferior ();
1563 signo
= target_signal_from_host (WTERMSIG (status
));
1564 error (_("Unable to attach: program terminated with signal "
1566 target_signal_to_name (signo
),
1567 target_signal_to_string (signo
));
1570 internal_error (__FILE__
, __LINE__
,
1571 _("unexpected status %d for PID %ld"),
1572 status
, (long) GET_LWP (ptid
));
1577 /* Save the wait status to report later. */
1579 if (debug_linux_nat
)
1580 fprintf_unfiltered (gdb_stdlog
,
1581 "LNA: waitpid %ld, saving status %s\n",
1582 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1584 lp
->status
= status
;
1586 if (target_can_async_p ())
1587 target_async (inferior_event_handler
, 0);
1590 /* Get pending status of LP. */
1592 get_pending_status (struct lwp_info
*lp
, int *status
)
1594 enum target_signal signo
= TARGET_SIGNAL_0
;
1596 /* If we paused threads momentarily, we may have stored pending
1597 events in lp->status or lp->waitstatus (see stop_wait_callback),
1598 and GDB core hasn't seen any signal for those threads.
1599 Otherwise, the last signal reported to the core is found in the
1600 thread object's stop_signal.
1602 There's a corner case that isn't handled here at present. Only
1603 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1604 stop_signal make sense as a real signal to pass to the inferior.
1605 Some catchpoint related events, like
1606 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1607 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1608 those traps are debug API (ptrace in our case) related and
1609 induced; the inferior wouldn't see them if it wasn't being
1610 traced. Hence, we should never pass them to the inferior, even
1611 when set to pass state. Since this corner case isn't handled by
1612 infrun.c when proceeding with a signal, for consistency, neither
1613 do we handle it here (or elsewhere in the file we check for
1614 signal pass state). Normally SIGTRAP isn't set to pass state, so
1615 this is really a corner case. */
1617 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1618 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1619 else if (lp
->status
)
1620 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1621 else if (non_stop
&& !is_executing (lp
->ptid
))
1623 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1625 signo
= tp
->suspend
.stop_signal
;
1629 struct target_waitstatus last
;
1632 get_last_target_status (&last_ptid
, &last
);
1634 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1636 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1638 signo
= tp
->suspend
.stop_signal
;
1644 if (signo
== TARGET_SIGNAL_0
)
1646 if (debug_linux_nat
)
1647 fprintf_unfiltered (gdb_stdlog
,
1648 "GPT: lwp %s has no pending signal\n",
1649 target_pid_to_str (lp
->ptid
));
1651 else if (!signal_pass_state (signo
))
1653 if (debug_linux_nat
)
1654 fprintf_unfiltered (gdb_stdlog
,
1655 "GPT: lwp %s had signal %s, "
1656 "but it is in no pass state\n",
1657 target_pid_to_str (lp
->ptid
),
1658 target_signal_to_string (signo
));
1662 *status
= W_STOPCODE (target_signal_to_host (signo
));
1664 if (debug_linux_nat
)
1665 fprintf_unfiltered (gdb_stdlog
,
1666 "GPT: lwp %s has pending signal %s\n",
1667 target_pid_to_str (lp
->ptid
),
1668 target_signal_to_string (signo
));
1675 detach_callback (struct lwp_info
*lp
, void *data
)
1677 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1679 if (debug_linux_nat
&& lp
->status
)
1680 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1681 strsignal (WSTOPSIG (lp
->status
)),
1682 target_pid_to_str (lp
->ptid
));
1684 /* If there is a pending SIGSTOP, get rid of it. */
1687 if (debug_linux_nat
)
1688 fprintf_unfiltered (gdb_stdlog
,
1689 "DC: Sending SIGCONT to %s\n",
1690 target_pid_to_str (lp
->ptid
));
1692 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1696 /* We don't actually detach from the LWP that has an id equal to the
1697 overall process id just yet. */
1698 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1702 /* Pass on any pending signal for this LWP. */
1703 get_pending_status (lp
, &status
);
1706 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1707 WSTOPSIG (status
)) < 0)
1708 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1709 safe_strerror (errno
));
1711 if (debug_linux_nat
)
1712 fprintf_unfiltered (gdb_stdlog
,
1713 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1714 target_pid_to_str (lp
->ptid
),
1715 strsignal (WSTOPSIG (status
)));
1717 delete_lwp (lp
->ptid
);
1724 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1728 struct lwp_info
*main_lwp
;
1730 pid
= GET_PID (inferior_ptid
);
1732 if (target_can_async_p ())
1733 linux_nat_async (NULL
, 0);
1735 /* Stop all threads before detaching. ptrace requires that the
1736 thread is stopped to sucessfully detach. */
1737 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1738 /* ... and wait until all of them have reported back that
1739 they're no longer running. */
1740 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1742 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1744 /* Only the initial process should be left right now. */
1745 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1747 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1749 /* Pass on any pending signal for the last LWP. */
1750 if ((args
== NULL
|| *args
== '\0')
1751 && get_pending_status (main_lwp
, &status
) != -1
1752 && WIFSTOPPED (status
))
1754 /* Put the signal number in ARGS so that inf_ptrace_detach will
1755 pass it along with PTRACE_DETACH. */
1757 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1758 if (debug_linux_nat
)
1759 fprintf_unfiltered (gdb_stdlog
,
1760 "LND: Sending signal %s to %s\n",
1762 target_pid_to_str (main_lwp
->ptid
));
1765 delete_lwp (main_lwp
->ptid
);
1767 if (forks_exist_p ())
1769 /* Multi-fork case. The current inferior_ptid is being detached
1770 from, but there are other viable forks to debug. Detach from
1771 the current fork, and context-switch to the first
1773 linux_fork_detach (args
, from_tty
);
1775 if (non_stop
&& target_can_async_p ())
1776 target_async (inferior_event_handler
, 0);
1779 linux_ops
->to_detach (ops
, args
, from_tty
);
1785 resume_callback (struct lwp_info
*lp
, void *data
)
1787 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1789 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1791 if (debug_linux_nat
)
1792 fprintf_unfiltered (gdb_stdlog
,
1793 "RC: Not resuming %s (vfork parent)\n",
1794 target_pid_to_str (lp
->ptid
));
1796 else if (lp
->stopped
&& lp
->status
== 0)
1798 if (debug_linux_nat
)
1799 fprintf_unfiltered (gdb_stdlog
,
1800 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1801 target_pid_to_str (lp
->ptid
));
1803 linux_ops
->to_resume (linux_ops
,
1804 pid_to_ptid (GET_LWP (lp
->ptid
)),
1805 0, TARGET_SIGNAL_0
);
1806 if (debug_linux_nat
)
1807 fprintf_unfiltered (gdb_stdlog
,
1808 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1809 target_pid_to_str (lp
->ptid
));
1812 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1813 lp
->stopped_by_watchpoint
= 0;
1815 else if (lp
->stopped
&& debug_linux_nat
)
1816 fprintf_unfiltered (gdb_stdlog
,
1817 "RC: Not resuming sibling %s (has pending)\n",
1818 target_pid_to_str (lp
->ptid
));
1819 else if (debug_linux_nat
)
1820 fprintf_unfiltered (gdb_stdlog
,
1821 "RC: Not resuming sibling %s (not stopped)\n",
1822 target_pid_to_str (lp
->ptid
));
1828 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1835 resume_set_callback (struct lwp_info
*lp
, void *data
)
1842 linux_nat_resume (struct target_ops
*ops
,
1843 ptid_t ptid
, int step
, enum target_signal signo
)
1846 struct lwp_info
*lp
;
1849 if (debug_linux_nat
)
1850 fprintf_unfiltered (gdb_stdlog
,
1851 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1852 step
? "step" : "resume",
1853 target_pid_to_str (ptid
),
1854 (signo
!= TARGET_SIGNAL_0
1855 ? strsignal (target_signal_to_host (signo
)) : "0"),
1856 target_pid_to_str (inferior_ptid
));
1858 block_child_signals (&prev_mask
);
1860 /* A specific PTID means `step only this process id'. */
1861 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1862 || ptid_is_pid (ptid
));
1864 /* Mark the lwps we're resuming as resumed. */
1865 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1867 /* See if it's the current inferior that should be handled
1870 lp
= find_lwp_pid (inferior_ptid
);
1872 lp
= find_lwp_pid (ptid
);
1873 gdb_assert (lp
!= NULL
);
1875 /* Remember if we're stepping. */
1878 /* If we have a pending wait status for this thread, there is no
1879 point in resuming the process. But first make sure that
1880 linux_nat_wait won't preemptively handle the event - we
1881 should never take this short-circuit if we are going to
1882 leave LP running, since we have skipped resuming all the
1883 other threads. This bit of code needs to be synchronized
1884 with linux_nat_wait. */
1886 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1888 enum target_signal saved_signo
;
1889 struct inferior
*inf
;
1891 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
1893 saved_signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1895 /* Defer to common code if we're gaining control of the
1897 if (inf
->control
.stop_soon
== NO_STOP_QUIETLY
1898 && signal_stop_state (saved_signo
) == 0
1899 && signal_print_state (saved_signo
) == 0
1900 && signal_pass_state (saved_signo
) == 1)
1902 if (debug_linux_nat
)
1903 fprintf_unfiltered (gdb_stdlog
,
1904 "LLR: Not short circuiting for ignored "
1905 "status 0x%x\n", lp
->status
);
1907 /* FIXME: What should we do if we are supposed to continue
1908 this thread with a signal? */
1909 gdb_assert (signo
== TARGET_SIGNAL_0
);
1910 signo
= saved_signo
;
1915 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1917 /* FIXME: What should we do if we are supposed to continue
1918 this thread with a signal? */
1919 gdb_assert (signo
== TARGET_SIGNAL_0
);
1921 if (debug_linux_nat
)
1922 fprintf_unfiltered (gdb_stdlog
,
1923 "LLR: Short circuiting for status 0x%x\n",
1926 restore_child_signals_mask (&prev_mask
);
1927 if (target_can_async_p ())
1929 target_async (inferior_event_handler
, 0);
1930 /* Tell the event loop we have something to process. */
1936 /* Mark LWP as not stopped to prevent it from being continued by
1941 iterate_over_lwps (ptid
, resume_callback
, NULL
);
1943 /* Convert to something the lower layer understands. */
1944 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
1946 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
1947 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1948 lp
->stopped_by_watchpoint
= 0;
1950 if (debug_linux_nat
)
1951 fprintf_unfiltered (gdb_stdlog
,
1952 "LLR: %s %s, %s (resume event thread)\n",
1953 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
1954 target_pid_to_str (ptid
),
1955 (signo
!= TARGET_SIGNAL_0
1956 ? strsignal (target_signal_to_host (signo
)) : "0"));
1958 restore_child_signals_mask (&prev_mask
);
1959 if (target_can_async_p ())
1960 target_async (inferior_event_handler
, 0);
1963 /* Send a signal to an LWP. */
1966 kill_lwp (int lwpid
, int signo
)
1968 /* Use tkill, if possible, in case we are using nptl threads. If tkill
1969 fails, then we are not using nptl threads and we should be using kill. */
1971 #ifdef HAVE_TKILL_SYSCALL
1973 static int tkill_failed
;
1980 ret
= syscall (__NR_tkill
, lwpid
, signo
);
1981 if (errno
!= ENOSYS
)
1988 return kill (lwpid
, signo
);
1991 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
1992 event, check if the core is interested in it: if not, ignore the
1993 event, and keep waiting; otherwise, we need to toggle the LWP's
1994 syscall entry/exit status, since the ptrace event itself doesn't
1995 indicate it, and report the trap to higher layers. */
1998 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2000 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2001 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2002 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2006 /* If we're stopping threads, there's a SIGSTOP pending, which
2007 makes it so that the LWP reports an immediate syscall return,
2008 followed by the SIGSTOP. Skip seeing that "return" using
2009 PTRACE_CONT directly, and let stop_wait_callback collect the
2010 SIGSTOP. Later when the thread is resumed, a new syscall
2011 entry event. If we didn't do this (and returned 0), we'd
2012 leave a syscall entry pending, and our caller, by using
2013 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2014 itself. Later, when the user re-resumes this LWP, we'd see
2015 another syscall entry event and we'd mistake it for a return.
2017 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2018 (leaving immediately with LWP->signalled set, without issuing
2019 a PTRACE_CONT), it would still be problematic to leave this
2020 syscall enter pending, as later when the thread is resumed,
2021 it would then see the same syscall exit mentioned above,
2022 followed by the delayed SIGSTOP, while the syscall didn't
2023 actually get to execute. It seems it would be even more
2024 confusing to the user. */
2026 if (debug_linux_nat
)
2027 fprintf_unfiltered (gdb_stdlog
,
2028 "LHST: ignoring syscall %d "
2029 "for LWP %ld (stopping threads), "
2030 "resuming with PTRACE_CONT for SIGSTOP\n",
2032 GET_LWP (lp
->ptid
));
2034 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2035 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2039 if (catch_syscall_enabled ())
2041 /* Always update the entry/return state, even if this particular
2042 syscall isn't interesting to the core now. In async mode,
2043 the user could install a new catchpoint for this syscall
2044 between syscall enter/return, and we'll need to know to
2045 report a syscall return if that happens. */
2046 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2047 ? TARGET_WAITKIND_SYSCALL_RETURN
2048 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2050 if (catching_syscall_number (syscall_number
))
2052 /* Alright, an event to report. */
2053 ourstatus
->kind
= lp
->syscall_state
;
2054 ourstatus
->value
.syscall_number
= syscall_number
;
2056 if (debug_linux_nat
)
2057 fprintf_unfiltered (gdb_stdlog
,
2058 "LHST: stopping for %s of syscall %d"
2061 == TARGET_WAITKIND_SYSCALL_ENTRY
2062 ? "entry" : "return",
2064 GET_LWP (lp
->ptid
));
2068 if (debug_linux_nat
)
2069 fprintf_unfiltered (gdb_stdlog
,
2070 "LHST: ignoring %s of syscall %d "
2072 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2073 ? "entry" : "return",
2075 GET_LWP (lp
->ptid
));
2079 /* If we had been syscall tracing, and hence used PT_SYSCALL
2080 before on this LWP, it could happen that the user removes all
2081 syscall catchpoints before we get to process this event.
2082 There are two noteworthy issues here:
2084 - When stopped at a syscall entry event, resuming with
2085 PT_STEP still resumes executing the syscall and reports a
2088 - Only PT_SYSCALL catches syscall enters. If we last
2089 single-stepped this thread, then this event can't be a
2090 syscall enter. If we last single-stepped this thread, this
2091 has to be a syscall exit.
2093 The points above mean that the next resume, be it PT_STEP or
2094 PT_CONTINUE, can not trigger a syscall trace event. */
2095 if (debug_linux_nat
)
2096 fprintf_unfiltered (gdb_stdlog
,
2097 "LHST: caught syscall event "
2098 "with no syscall catchpoints."
2099 " %d for LWP %ld, ignoring\n",
2101 GET_LWP (lp
->ptid
));
2102 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2105 /* The core isn't interested in this event. For efficiency, avoid
2106 stopping all threads only to have the core resume them all again.
2107 Since we're not stopping threads, if we're still syscall tracing
2108 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2109 subsequent syscall. Simply resume using the inf-ptrace layer,
2110 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2112 /* Note that gdbarch_get_syscall_number may access registers, hence
2114 registers_changed ();
2115 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2116 lp
->step
, TARGET_SIGNAL_0
);
2120 /* Handle a GNU/Linux extended wait response. If we see a clone
2121 event, we need to add the new LWP to our list (and not report the
2122 trap to higher layers). This function returns non-zero if the
2123 event should be ignored and we should wait again. If STOPPING is
2124 true, the new LWP remains stopped, otherwise it is continued. */
2127 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2130 int pid
= GET_LWP (lp
->ptid
);
2131 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2132 int event
= status
>> 16;
2134 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2135 || event
== PTRACE_EVENT_CLONE
)
2137 unsigned long new_pid
;
2140 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2142 /* If we haven't already seen the new PID stop, wait for it now. */
2143 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2145 /* The new child has a pending SIGSTOP. We can't affect it until it
2146 hits the SIGSTOP, but we're already attached. */
2147 ret
= my_waitpid (new_pid
, &status
,
2148 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2150 perror_with_name (_("waiting for new child"));
2151 else if (ret
!= new_pid
)
2152 internal_error (__FILE__
, __LINE__
,
2153 _("wait returned unexpected PID %d"), ret
);
2154 else if (!WIFSTOPPED (status
))
2155 internal_error (__FILE__
, __LINE__
,
2156 _("wait returned unexpected status 0x%x"), status
);
2159 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2161 if (event
== PTRACE_EVENT_FORK
2162 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2164 /* Handle checkpointing by linux-fork.c here as a special
2165 case. We don't want the follow-fork-mode or 'catch fork'
2166 to interfere with this. */
2168 /* This won't actually modify the breakpoint list, but will
2169 physically remove the breakpoints from the child. */
2170 detach_breakpoints (new_pid
);
2172 /* Retain child fork in ptrace (stopped) state. */
2173 if (!find_fork_pid (new_pid
))
2176 /* Report as spurious, so that infrun doesn't want to follow
2177 this fork. We're actually doing an infcall in
2179 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2180 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2182 /* Report the stop to the core. */
2186 if (event
== PTRACE_EVENT_FORK
)
2187 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2188 else if (event
== PTRACE_EVENT_VFORK
)
2189 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2192 struct lwp_info
*new_lp
;
2194 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2196 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2198 new_lp
->stopped
= 1;
2200 if (WSTOPSIG (status
) != SIGSTOP
)
2202 /* This can happen if someone starts sending signals to
2203 the new thread before it gets a chance to run, which
2204 have a lower number than SIGSTOP (e.g. SIGUSR1).
2205 This is an unlikely case, and harder to handle for
2206 fork / vfork than for clone, so we do not try - but
2207 we handle it for clone events here. We'll send
2208 the other signal on to the thread below. */
2210 new_lp
->signalled
= 1;
2217 /* Add the new thread to GDB's lists as soon as possible
2220 1) the frontend doesn't have to wait for a stop to
2223 2) we tag it with the correct running state. */
2225 /* If the thread_db layer is active, let it know about
2226 this new thread, and add it to GDB's list. */
2227 if (!thread_db_attach_lwp (new_lp
->ptid
))
2229 /* We're not using thread_db. Add it to GDB's
2231 target_post_attach (GET_LWP (new_lp
->ptid
));
2232 add_thread (new_lp
->ptid
);
2237 set_running (new_lp
->ptid
, 1);
2238 set_executing (new_lp
->ptid
, 1);
2242 /* Note the need to use the low target ops to resume, to
2243 handle resuming with PT_SYSCALL if we have syscall
2247 enum target_signal signo
;
2249 new_lp
->stopped
= 0;
2250 new_lp
->resumed
= 1;
2253 ? target_signal_from_host (WSTOPSIG (status
))
2256 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2263 /* We created NEW_LP so it cannot yet contain STATUS. */
2264 gdb_assert (new_lp
->status
== 0);
2266 /* Save the wait status to report later. */
2267 if (debug_linux_nat
)
2268 fprintf_unfiltered (gdb_stdlog
,
2269 "LHEW: waitpid of new LWP %ld, "
2270 "saving status %s\n",
2271 (long) GET_LWP (new_lp
->ptid
),
2272 status_to_str (status
));
2273 new_lp
->status
= status
;
2277 if (debug_linux_nat
)
2278 fprintf_unfiltered (gdb_stdlog
,
2279 "LHEW: Got clone event "
2280 "from LWP %ld, resuming\n",
2281 GET_LWP (lp
->ptid
));
2282 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2283 0, TARGET_SIGNAL_0
);
2291 if (event
== PTRACE_EVENT_EXEC
)
2293 if (debug_linux_nat
)
2294 fprintf_unfiltered (gdb_stdlog
,
2295 "LHEW: Got exec event from LWP %ld\n",
2296 GET_LWP (lp
->ptid
));
2298 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2299 ourstatus
->value
.execd_pathname
2300 = xstrdup (linux_child_pid_to_exec_file (pid
));
2305 if (event
== PTRACE_EVENT_VFORK_DONE
)
2307 if (current_inferior ()->waiting_for_vfork_done
)
2309 if (debug_linux_nat
)
2310 fprintf_unfiltered (gdb_stdlog
,
2311 "LHEW: Got expected PTRACE_EVENT_"
2312 "VFORK_DONE from LWP %ld: stopping\n",
2313 GET_LWP (lp
->ptid
));
2315 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2319 if (debug_linux_nat
)
2320 fprintf_unfiltered (gdb_stdlog
,
2321 "LHEW: Got PTRACE_EVENT_VFORK_DONE "
2322 "from LWP %ld: resuming\n",
2323 GET_LWP (lp
->ptid
));
2324 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2328 internal_error (__FILE__
, __LINE__
,
2329 _("unknown ptrace event %d"), event
);
2332 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2336 wait_lwp (struct lwp_info
*lp
)
2340 int thread_dead
= 0;
2342 gdb_assert (!lp
->stopped
);
2343 gdb_assert (lp
->status
== 0);
2345 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2346 if (pid
== -1 && errno
== ECHILD
)
2348 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2349 if (pid
== -1 && errno
== ECHILD
)
2351 /* The thread has previously exited. We need to delete it
2352 now because, for some vendor 2.4 kernels with NPTL
2353 support backported, there won't be an exit event unless
2354 it is the main thread. 2.6 kernels will report an exit
2355 event for each thread that exits, as expected. */
2357 if (debug_linux_nat
)
2358 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2359 target_pid_to_str (lp
->ptid
));
2365 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2367 if (debug_linux_nat
)
2369 fprintf_unfiltered (gdb_stdlog
,
2370 "WL: waitpid %s received %s\n",
2371 target_pid_to_str (lp
->ptid
),
2372 status_to_str (status
));
2376 /* Check if the thread has exited. */
2377 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2380 if (debug_linux_nat
)
2381 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2382 target_pid_to_str (lp
->ptid
));
2391 gdb_assert (WIFSTOPPED (status
));
2393 /* Handle GNU/Linux's syscall SIGTRAPs. */
2394 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2396 /* No longer need the sysgood bit. The ptrace event ends up
2397 recorded in lp->waitstatus if we care for it. We can carry
2398 on handling the event like a regular SIGTRAP from here
2400 status
= W_STOPCODE (SIGTRAP
);
2401 if (linux_handle_syscall_trap (lp
, 1))
2402 return wait_lwp (lp
);
2405 /* Handle GNU/Linux's extended waitstatus for trace events. */
2406 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2408 if (debug_linux_nat
)
2409 fprintf_unfiltered (gdb_stdlog
,
2410 "WL: Handling extended status 0x%06x\n",
2412 if (linux_handle_extended_wait (lp
, status
, 1))
2413 return wait_lwp (lp
);
2419 /* Save the most recent siginfo for LP. This is currently only called
2420 for SIGTRAP; some ports use the si_addr field for
2421 target_stopped_data_address. In the future, it may also be used to
2422 restore the siginfo of requeued signals. */
2425 save_siginfo (struct lwp_info
*lp
)
2428 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2429 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2432 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2435 /* Send a SIGSTOP to LP. */
2438 stop_callback (struct lwp_info
*lp
, void *data
)
2440 if (!lp
->stopped
&& !lp
->signalled
)
2444 if (debug_linux_nat
)
2446 fprintf_unfiltered (gdb_stdlog
,
2447 "SC: kill %s **<SIGSTOP>**\n",
2448 target_pid_to_str (lp
->ptid
));
2451 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2452 if (debug_linux_nat
)
2454 fprintf_unfiltered (gdb_stdlog
,
2455 "SC: lwp kill %d %s\n",
2457 errno
? safe_strerror (errno
) : "ERRNO-OK");
2461 gdb_assert (lp
->status
== 0);
2467 /* Return non-zero if LWP PID has a pending SIGINT. */
2470 linux_nat_has_pending_sigint (int pid
)
2472 sigset_t pending
, blocked
, ignored
;
2474 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2476 if (sigismember (&pending
, SIGINT
)
2477 && !sigismember (&ignored
, SIGINT
))
2483 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2486 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2488 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2489 flag to consume the next one. */
2490 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2491 && WSTOPSIG (lp
->status
) == SIGINT
)
2494 lp
->ignore_sigint
= 1;
2499 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2500 This function is called after we know the LWP has stopped; if the LWP
2501 stopped before the expected SIGINT was delivered, then it will never have
2502 arrived. Also, if the signal was delivered to a shared queue and consumed
2503 by a different thread, it will never be delivered to this LWP. */
2506 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2508 if (!lp
->ignore_sigint
)
2511 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2513 if (debug_linux_nat
)
2514 fprintf_unfiltered (gdb_stdlog
,
2515 "MCIS: Clearing bogus flag for %s\n",
2516 target_pid_to_str (lp
->ptid
));
2517 lp
->ignore_sigint
= 0;
2521 /* Fetch the possible triggered data watchpoint info and store it in
2524 On some archs, like x86, that use debug registers to set
2525 watchpoints, it's possible that the way to know which watched
2526 address trapped, is to check the register that is used to select
2527 which address to watch. Problem is, between setting the watchpoint
2528 and reading back which data address trapped, the user may change
2529 the set of watchpoints, and, as a consequence, GDB changes the
2530 debug registers in the inferior. To avoid reading back a stale
2531 stopped-data-address when that happens, we cache in LP the fact
2532 that a watchpoint trapped, and the corresponding data address, as
2533 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2534 registers meanwhile, we have the cached data we can rely on. */
2537 save_sigtrap (struct lwp_info
*lp
)
2539 struct cleanup
*old_chain
;
2541 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2543 lp
->stopped_by_watchpoint
= 0;
2547 old_chain
= save_inferior_ptid ();
2548 inferior_ptid
= lp
->ptid
;
2550 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2552 if (lp
->stopped_by_watchpoint
)
2554 if (linux_ops
->to_stopped_data_address
!= NULL
)
2555 lp
->stopped_data_address_p
=
2556 linux_ops
->to_stopped_data_address (¤t_target
,
2557 &lp
->stopped_data_address
);
2559 lp
->stopped_data_address_p
= 0;
2562 do_cleanups (old_chain
);
2565 /* See save_sigtrap. */
2568 linux_nat_stopped_by_watchpoint (void)
2570 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2572 gdb_assert (lp
!= NULL
);
2574 return lp
->stopped_by_watchpoint
;
2578 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2580 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2582 gdb_assert (lp
!= NULL
);
2584 *addr_p
= lp
->stopped_data_address
;
2586 return lp
->stopped_data_address_p
;
2589 /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
2592 sigtrap_is_event (int status
)
2594 return WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
;
2597 /* SIGTRAP-like events recognizer. */
2599 static int (*linux_nat_status_is_event
) (int status
) = sigtrap_is_event
;
2601 /* Check for SIGTRAP-like events in LP. */
2604 linux_nat_lp_status_is_event (struct lwp_info
*lp
)
2606 /* We check for lp->waitstatus in addition to lp->status, because we can
2607 have pending process exits recorded in lp->status
2608 and W_EXITCODE(0,0) == 0. We should probably have an additional
2609 lp->status_p flag. */
2611 return (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2612 && linux_nat_status_is_event (lp
->status
));
2615 /* Set alternative SIGTRAP-like events recognizer. If
2616 breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
2620 linux_nat_set_status_is_event (struct target_ops
*t
,
2621 int (*status_is_event
) (int status
))
2623 linux_nat_status_is_event
= status_is_event
;
2626 /* Wait until LP is stopped. */
2629 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2631 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2633 /* If this is a vfork parent, bail out, it is not going to report
2634 any SIGSTOP until the vfork is done with. */
2635 if (inf
->vfork_child
!= NULL
)
2642 status
= wait_lwp (lp
);
2646 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2647 && WSTOPSIG (status
) == SIGINT
)
2649 lp
->ignore_sigint
= 0;
2652 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2653 if (debug_linux_nat
)
2654 fprintf_unfiltered (gdb_stdlog
,
2655 "PTRACE_CONT %s, 0, 0 (%s) "
2656 "(discarding SIGINT)\n",
2657 target_pid_to_str (lp
->ptid
),
2658 errno
? safe_strerror (errno
) : "OK");
2660 return stop_wait_callback (lp
, NULL
);
2663 maybe_clear_ignore_sigint (lp
);
2665 if (WSTOPSIG (status
) != SIGSTOP
)
2667 if (linux_nat_status_is_event (status
))
2669 /* If a LWP other than the LWP that we're reporting an
2670 event for has hit a GDB breakpoint (as opposed to
2671 some random trap signal), then just arrange for it to
2672 hit it again later. We don't keep the SIGTRAP status
2673 and don't forward the SIGTRAP signal to the LWP. We
2674 will handle the current event, eventually we will
2675 resume all LWPs, and this one will get its breakpoint
2678 If we do not do this, then we run the risk that the
2679 user will delete or disable the breakpoint, but the
2680 thread will have already tripped on it. */
2682 /* Save the trap's siginfo in case we need it later. */
2687 /* Now resume this LWP and get the SIGSTOP event. */
2689 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2690 if (debug_linux_nat
)
2692 fprintf_unfiltered (gdb_stdlog
,
2693 "PTRACE_CONT %s, 0, 0 (%s)\n",
2694 target_pid_to_str (lp
->ptid
),
2695 errno
? safe_strerror (errno
) : "OK");
2697 fprintf_unfiltered (gdb_stdlog
,
2698 "SWC: Candidate SIGTRAP event in %s\n",
2699 target_pid_to_str (lp
->ptid
));
2701 /* Hold this event/waitstatus while we check to see if
2702 there are any more (we still want to get that SIGSTOP). */
2703 stop_wait_callback (lp
, NULL
);
2705 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2706 there's another event, throw it back into the
2710 if (debug_linux_nat
)
2711 fprintf_unfiltered (gdb_stdlog
,
2712 "SWC: kill %s, %s\n",
2713 target_pid_to_str (lp
->ptid
),
2714 status_to_str ((int) status
));
2715 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2718 /* Save the sigtrap event. */
2719 lp
->status
= status
;
2724 /* The thread was stopped with a signal other than
2725 SIGSTOP, and didn't accidentally trip a breakpoint. */
2727 if (debug_linux_nat
)
2729 fprintf_unfiltered (gdb_stdlog
,
2730 "SWC: Pending event %s in %s\n",
2731 status_to_str ((int) status
),
2732 target_pid_to_str (lp
->ptid
));
2734 /* Now resume this LWP and get the SIGSTOP event. */
2736 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2737 if (debug_linux_nat
)
2738 fprintf_unfiltered (gdb_stdlog
,
2739 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2740 target_pid_to_str (lp
->ptid
),
2741 errno
? safe_strerror (errno
) : "OK");
2743 /* Hold this event/waitstatus while we check to see if
2744 there are any more (we still want to get that SIGSTOP). */
2745 stop_wait_callback (lp
, NULL
);
2747 /* If the lp->status field is still empty, use it to
2748 hold this event. If not, then this event must be
2749 returned to the event queue of the LWP. */
2752 if (debug_linux_nat
)
2754 fprintf_unfiltered (gdb_stdlog
,
2755 "SWC: kill %s, %s\n",
2756 target_pid_to_str (lp
->ptid
),
2757 status_to_str ((int) status
));
2759 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2762 lp
->status
= status
;
2768 /* We caught the SIGSTOP that we intended to catch, so
2769 there's no SIGSTOP pending. */
2778 /* Return non-zero if LP has a wait status pending. */
2781 status_callback (struct lwp_info
*lp
, void *data
)
2783 /* Only report a pending wait status if we pretend that this has
2784 indeed been resumed. */
2788 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2790 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2791 or a pending process exit. Note that `W_EXITCODE(0,0) ==
2792 0', so a clean process exit can not be stored pending in
2793 lp->status, it is indistinguishable from
2794 no-pending-status. */
2798 if (lp
->status
!= 0)
2804 /* Return non-zero if LP isn't stopped. */
2807 running_callback (struct lwp_info
*lp
, void *data
)
2809 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2812 /* Count the LWP's that have had events. */
2815 count_events_callback (struct lwp_info
*lp
, void *data
)
2819 gdb_assert (count
!= NULL
);
2821 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2822 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2828 /* Select the LWP (if any) that is currently being single-stepped. */
2831 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2833 if (lp
->step
&& lp
->status
!= 0)
2839 /* Select the Nth LWP that has had a SIGTRAP event. */
2842 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2844 int *selector
= data
;
2846 gdb_assert (selector
!= NULL
);
2848 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2849 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2850 if ((*selector
)-- == 0)
2857 cancel_breakpoint (struct lwp_info
*lp
)
2859 /* Arrange for a breakpoint to be hit again later. We don't keep
2860 the SIGTRAP status and don't forward the SIGTRAP signal to the
2861 LWP. We will handle the current event, eventually we will resume
2862 this LWP, and this breakpoint will trap again.
2864 If we do not do this, then we run the risk that the user will
2865 delete or disable the breakpoint, but the LWP will have already
2868 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2869 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2872 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2873 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2875 if (debug_linux_nat
)
2876 fprintf_unfiltered (gdb_stdlog
,
2877 "CB: Push back breakpoint for %s\n",
2878 target_pid_to_str (lp
->ptid
));
2880 /* Back up the PC if necessary. */
2881 if (gdbarch_decr_pc_after_break (gdbarch
))
2882 regcache_write_pc (regcache
, pc
);
2890 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2892 struct lwp_info
*event_lp
= data
;
2894 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2898 /* If a LWP other than the LWP that we're reporting an event for has
2899 hit a GDB breakpoint (as opposed to some random trap signal),
2900 then just arrange for it to hit it again later. We don't keep
2901 the SIGTRAP status and don't forward the SIGTRAP signal to the
2902 LWP. We will handle the current event, eventually we will resume
2903 all LWPs, and this one will get its breakpoint trap again.
2905 If we do not do this, then we run the risk that the user will
2906 delete or disable the breakpoint, but the LWP will have already
2909 if (linux_nat_lp_status_is_event (lp
)
2910 && cancel_breakpoint (lp
))
2911 /* Throw away the SIGTRAP. */
2917 /* Select one LWP out of those that have events pending. */
2920 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2923 int random_selector
;
2924 struct lwp_info
*event_lp
;
2926 /* Record the wait status for the original LWP. */
2927 (*orig_lp
)->status
= *status
;
2929 /* Give preference to any LWP that is being single-stepped. */
2930 event_lp
= iterate_over_lwps (filter
,
2931 select_singlestep_lwp_callback
, NULL
);
2932 if (event_lp
!= NULL
)
2934 if (debug_linux_nat
)
2935 fprintf_unfiltered (gdb_stdlog
,
2936 "SEL: Select single-step %s\n",
2937 target_pid_to_str (event_lp
->ptid
));
2941 /* No single-stepping LWP. Select one at random, out of those
2942 which have had SIGTRAP events. */
2944 /* First see how many SIGTRAP events we have. */
2945 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2947 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2948 random_selector
= (int)
2949 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2951 if (debug_linux_nat
&& num_events
> 1)
2952 fprintf_unfiltered (gdb_stdlog
,
2953 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2954 num_events
, random_selector
);
2956 event_lp
= iterate_over_lwps (filter
,
2957 select_event_lwp_callback
,
2961 if (event_lp
!= NULL
)
2963 /* Switch the event LWP. */
2964 *orig_lp
= event_lp
;
2965 *status
= event_lp
->status
;
2968 /* Flush the wait status for the event LWP. */
2969 (*orig_lp
)->status
= 0;
2972 /* Return non-zero if LP has been resumed. */
2975 resumed_callback (struct lwp_info
*lp
, void *data
)
2980 /* Stop an active thread, verify it still exists, then resume it. */
2983 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
2985 struct lwp_info
*ptr
;
2987 if (!lp
->stopped
&& !lp
->signalled
)
2989 stop_callback (lp
, NULL
);
2990 stop_wait_callback (lp
, NULL
);
2991 /* Resume if the lwp still exists. */
2992 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
2995 resume_callback (lp
, NULL
);
2996 resume_set_callback (lp
, NULL
);
3002 /* Check if we should go on and pass this event to common code.
3003 Return the affected lwp if we are, or NULL otherwise. */
3004 static struct lwp_info
*
3005 linux_nat_filter_event (int lwpid
, int status
, int options
)
3007 struct lwp_info
*lp
;
3009 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3011 /* Check for stop events reported by a process we didn't already
3012 know about - anything not already in our LWP list.
3014 If we're expecting to receive stopped processes after
3015 fork, vfork, and clone events, then we'll just add the
3016 new one to our list and go back to waiting for the event
3017 to be reported - the stopped process might be returned
3018 from waitpid before or after the event is. */
3019 if (WIFSTOPPED (status
) && !lp
)
3021 linux_record_stopped_pid (lwpid
, status
);
3025 /* Make sure we don't report an event for the exit of an LWP not in
3026 our list, i.e. not part of the current process. This can happen
3027 if we detach from a program we originally forked and then it
3029 if (!WIFSTOPPED (status
) && !lp
)
3032 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3033 CLONE_PTRACE processes which do not use the thread library -
3034 otherwise we wouldn't find the new LWP this way. That doesn't
3035 currently work, and the following code is currently unreachable
3036 due to the two blocks above. If it's fixed some day, this code
3037 should be broken out into a function so that we can also pick up
3038 LWPs from the new interface. */
3041 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3042 if (options
& __WCLONE
)
3045 gdb_assert (WIFSTOPPED (status
)
3046 && WSTOPSIG (status
) == SIGSTOP
);
3049 if (!in_thread_list (inferior_ptid
))
3051 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3052 GET_PID (inferior_ptid
));
3053 add_thread (inferior_ptid
);
3056 add_thread (lp
->ptid
);
3059 /* Handle GNU/Linux's syscall SIGTRAPs. */
3060 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3062 /* No longer need the sysgood bit. The ptrace event ends up
3063 recorded in lp->waitstatus if we care for it. We can carry
3064 on handling the event like a regular SIGTRAP from here
3066 status
= W_STOPCODE (SIGTRAP
);
3067 if (linux_handle_syscall_trap (lp
, 0))
3071 /* Handle GNU/Linux's extended waitstatus for trace events. */
3072 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3074 if (debug_linux_nat
)
3075 fprintf_unfiltered (gdb_stdlog
,
3076 "LLW: Handling extended status 0x%06x\n",
3078 if (linux_handle_extended_wait (lp
, status
, 0))
3082 if (linux_nat_status_is_event (status
))
3084 /* Save the trap's siginfo in case we need it later. */
3090 /* Check if the thread has exited. */
3091 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3092 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3094 /* If this is the main thread, we must stop all threads and verify
3095 if they are still alive. This is because in the nptl thread model
3096 on Linux 2.4, there is no signal issued for exiting LWPs
3097 other than the main thread. We only get the main thread exit
3098 signal once all child threads have already exited. If we
3099 stop all the threads and use the stop_wait_callback to check
3100 if they have exited we can determine whether this signal
3101 should be ignored or whether it means the end of the debugged
3102 application, regardless of which threading model is being
3104 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3107 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3108 stop_and_resume_callback
, NULL
);
3111 if (debug_linux_nat
)
3112 fprintf_unfiltered (gdb_stdlog
,
3113 "LLW: %s exited.\n",
3114 target_pid_to_str (lp
->ptid
));
3116 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3118 /* If there is at least one more LWP, then the exit signal
3119 was not the end of the debugged application and should be
3126 /* Check if the current LWP has previously exited. In the nptl
3127 thread model, LWPs other than the main thread do not issue
3128 signals when they exit so we must check whenever the thread has
3129 stopped. A similar check is made in stop_wait_callback(). */
3130 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3132 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3134 if (debug_linux_nat
)
3135 fprintf_unfiltered (gdb_stdlog
,
3136 "LLW: %s exited.\n",
3137 target_pid_to_str (lp
->ptid
));
3141 /* Make sure there is at least one thread running. */
3142 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3144 /* Discard the event. */
3148 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3149 an attempt to stop an LWP. */
3151 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3153 if (debug_linux_nat
)
3154 fprintf_unfiltered (gdb_stdlog
,
3155 "LLW: Delayed SIGSTOP caught for %s.\n",
3156 target_pid_to_str (lp
->ptid
));
3158 /* This is a delayed SIGSTOP. */
3161 registers_changed ();
3163 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3164 lp
->step
, TARGET_SIGNAL_0
);
3165 if (debug_linux_nat
)
3166 fprintf_unfiltered (gdb_stdlog
,
3167 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3169 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3170 target_pid_to_str (lp
->ptid
));
3173 gdb_assert (lp
->resumed
);
3175 /* Discard the event. */
3179 /* Make sure we don't report a SIGINT that we have already displayed
3180 for another thread. */
3181 if (lp
->ignore_sigint
3182 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3184 if (debug_linux_nat
)
3185 fprintf_unfiltered (gdb_stdlog
,
3186 "LLW: Delayed SIGINT caught for %s.\n",
3187 target_pid_to_str (lp
->ptid
));
3189 /* This is a delayed SIGINT. */
3190 lp
->ignore_sigint
= 0;
3192 registers_changed ();
3193 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3194 lp
->step
, TARGET_SIGNAL_0
);
3195 if (debug_linux_nat
)
3196 fprintf_unfiltered (gdb_stdlog
,
3197 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3199 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3200 target_pid_to_str (lp
->ptid
));
3203 gdb_assert (lp
->resumed
);
3205 /* Discard the event. */
3209 /* An interesting event. */
3211 lp
->status
= status
;
3216 linux_nat_wait_1 (struct target_ops
*ops
,
3217 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3220 static sigset_t prev_mask
;
3221 struct lwp_info
*lp
= NULL
;
3226 if (debug_linux_nat_async
)
3227 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3229 /* The first time we get here after starting a new inferior, we may
3230 not have added it to the LWP list yet - this is the earliest
3231 moment at which we know its PID. */
3232 if (ptid_is_pid (inferior_ptid
))
3234 /* Upgrade the main thread's ptid. */
3235 thread_change_ptid (inferior_ptid
,
3236 BUILD_LWP (GET_PID (inferior_ptid
),
3237 GET_PID (inferior_ptid
)));
3239 lp
= add_lwp (inferior_ptid
);
3243 /* Make sure SIGCHLD is blocked. */
3244 block_child_signals (&prev_mask
);
3246 if (ptid_equal (ptid
, minus_one_ptid
))
3248 else if (ptid_is_pid (ptid
))
3249 /* A request to wait for a specific tgid. This is not possible
3250 with waitpid, so instead, we wait for any child, and leave
3251 children we're not interested in right now with a pending
3252 status to report later. */
3255 pid
= GET_LWP (ptid
);
3261 /* Make sure that of those LWPs we want to get an event from, there
3262 is at least one LWP that has been resumed. If there's none, just
3263 bail out. The core may just be flushing asynchronously all
3265 if (iterate_over_lwps (ptid
, resumed_callback
, NULL
) == NULL
)
3267 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3269 if (debug_linux_nat_async
)
3270 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (no resumed LWP)\n");
3272 restore_child_signals_mask (&prev_mask
);
3273 return minus_one_ptid
;
3276 /* First check if there is a LWP with a wait status pending. */
3279 /* Any LWP that's been resumed will do. */
3280 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3283 if (debug_linux_nat
&& lp
->status
)
3284 fprintf_unfiltered (gdb_stdlog
,
3285 "LLW: Using pending wait status %s for %s.\n",
3286 status_to_str (lp
->status
),
3287 target_pid_to_str (lp
->ptid
));
3290 /* But if we don't find one, we'll have to wait, and check both
3291 cloned and uncloned processes. We start with the cloned
3293 options
= __WCLONE
| WNOHANG
;
3295 else if (is_lwp (ptid
))
3297 if (debug_linux_nat
)
3298 fprintf_unfiltered (gdb_stdlog
,
3299 "LLW: Waiting for specific LWP %s.\n",
3300 target_pid_to_str (ptid
));
3302 /* We have a specific LWP to check. */
3303 lp
= find_lwp_pid (ptid
);
3306 if (debug_linux_nat
&& lp
->status
)
3307 fprintf_unfiltered (gdb_stdlog
,
3308 "LLW: Using pending wait status %s for %s.\n",
3309 status_to_str (lp
->status
),
3310 target_pid_to_str (lp
->ptid
));
3312 /* If we have to wait, take into account whether PID is a cloned
3313 process or not. And we have to convert it to something that
3314 the layer beneath us can understand. */
3315 options
= lp
->cloned
? __WCLONE
: 0;
3316 pid
= GET_LWP (ptid
);
3318 /* We check for lp->waitstatus in addition to lp->status,
3319 because we can have pending process exits recorded in
3320 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3321 an additional lp->status_p flag. */
3322 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3326 if (lp
&& lp
->signalled
)
3328 /* A pending SIGSTOP may interfere with the normal stream of
3329 events. In a typical case where interference is a problem,
3330 we have a SIGSTOP signal pending for LWP A while
3331 single-stepping it, encounter an event in LWP B, and take the
3332 pending SIGSTOP while trying to stop LWP A. After processing
3333 the event in LWP B, LWP A is continued, and we'll never see
3334 the SIGTRAP associated with the last time we were
3335 single-stepping LWP A. */
3337 /* Resume the thread. It should halt immediately returning the
3339 registers_changed ();
3340 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3341 lp
->step
, TARGET_SIGNAL_0
);
3342 if (debug_linux_nat
)
3343 fprintf_unfiltered (gdb_stdlog
,
3344 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3345 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3346 target_pid_to_str (lp
->ptid
));
3348 gdb_assert (lp
->resumed
);
3350 /* Catch the pending SIGSTOP. */
3351 status
= lp
->status
;
3354 stop_wait_callback (lp
, NULL
);
3356 /* If the lp->status field isn't empty, we caught another signal
3357 while flushing the SIGSTOP. Return it back to the event
3358 queue of the LWP, as we already have an event to handle. */
3361 if (debug_linux_nat
)
3362 fprintf_unfiltered (gdb_stdlog
,
3363 "LLW: kill %s, %s\n",
3364 target_pid_to_str (lp
->ptid
),
3365 status_to_str (lp
->status
));
3366 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3369 lp
->status
= status
;
3372 if (!target_can_async_p ())
3374 /* Causes SIGINT to be passed on to the attached process. */
3378 /* Translate generic target_wait options into waitpid options. */
3379 if (target_options
& TARGET_WNOHANG
)
3386 lwpid
= my_waitpid (pid
, &status
, options
);
3390 gdb_assert (pid
== -1 || lwpid
== pid
);
3392 if (debug_linux_nat
)
3394 fprintf_unfiltered (gdb_stdlog
,
3395 "LLW: waitpid %ld received %s\n",
3396 (long) lwpid
, status_to_str (status
));
3399 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3401 /* STATUS is now no longer valid, use LP->STATUS instead. */
3405 && ptid_is_pid (ptid
)
3406 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3408 gdb_assert (lp
->resumed
);
3410 if (debug_linux_nat
)
3412 "LWP %ld got an event %06x, leaving pending.\n",
3413 ptid_get_lwp (lp
->ptid
), lp
->status
);
3415 if (WIFSTOPPED (lp
->status
))
3417 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3419 /* Cancel breakpoint hits. The breakpoint may
3420 be removed before we fetch events from this
3421 process to report to the core. It is best
3422 not to assume the moribund breakpoints
3423 heuristic always handles these cases --- it
3424 could be too many events go through to the
3425 core before this one is handled. All-stop
3426 always cancels breakpoint hits in all
3429 && linux_nat_lp_status_is_event (lp
)
3430 && cancel_breakpoint (lp
))
3432 /* Throw away the SIGTRAP. */
3435 if (debug_linux_nat
)
3437 "LLW: LWP %ld hit a breakpoint while"
3438 " waiting for another process;"
3440 ptid_get_lwp (lp
->ptid
));
3450 else if (WIFEXITED (lp
->status
) || WIFSIGNALED (lp
->status
))
3452 if (debug_linux_nat
)
3454 "Process %ld exited while stopping LWPs\n",
3455 ptid_get_lwp (lp
->ptid
));
3457 /* This was the last lwp in the process. Since
3458 events are serialized to GDB core, and we can't
3459 report this one right now, but GDB core and the
3460 other target layers will want to be notified
3461 about the exit code/signal, leave the status
3462 pending for the next time we're able to report
3465 /* Prevent trying to stop this thread again. We'll
3466 never try to resume it because it has a pending
3470 /* Dead LWP's aren't expected to reported a pending
3474 /* Store the pending event in the waitstatus as
3475 well, because W_EXITCODE(0,0) == 0. */
3476 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3490 /* waitpid did return something. Restart over. */
3491 options
|= __WCLONE
;
3499 /* Alternate between checking cloned and uncloned processes. */
3500 options
^= __WCLONE
;
3502 /* And every time we have checked both:
3503 In async mode, return to event loop;
3504 In sync mode, suspend waiting for a SIGCHLD signal. */
3505 if (options
& __WCLONE
)
3507 if (target_options
& TARGET_WNOHANG
)
3509 /* No interesting event. */
3510 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3512 if (debug_linux_nat_async
)
3513 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3515 restore_child_signals_mask (&prev_mask
);
3516 return minus_one_ptid
;
3519 sigsuspend (&suspend_mask
);
3522 else if (target_options
& TARGET_WNOHANG
)
3524 /* No interesting event for PID yet. */
3525 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3527 if (debug_linux_nat_async
)
3528 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3530 restore_child_signals_mask (&prev_mask
);
3531 return minus_one_ptid
;
3534 /* We shouldn't end up here unless we want to try again. */
3535 gdb_assert (lp
== NULL
);
3538 if (!target_can_async_p ())
3539 clear_sigint_trap ();
3543 status
= lp
->status
;
3546 /* Don't report signals that GDB isn't interested in, such as
3547 signals that are neither printed nor stopped upon. Stopping all
3548 threads can be a bit time-consuming so if we want decent
3549 performance with heavily multi-threaded programs, especially when
3550 they're using a high frequency timer, we'd better avoid it if we
3553 if (WIFSTOPPED (status
))
3555 enum target_signal signo
= target_signal_from_host (WSTOPSIG (status
));
3556 struct inferior
*inf
;
3558 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
3561 /* Defer to common code if we get a signal while
3562 single-stepping, since that may need special care, e.g. to
3563 skip the signal handler, or, if we're gaining control of the
3566 && inf
->control
.stop_soon
== NO_STOP_QUIETLY
3567 && signal_stop_state (signo
) == 0
3568 && signal_print_state (signo
) == 0
3569 && signal_pass_state (signo
) == 1)
3571 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3572 here? It is not clear we should. GDB may not expect
3573 other threads to run. On the other hand, not resuming
3574 newly attached threads may cause an unwanted delay in
3575 getting them running. */
3576 registers_changed ();
3577 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3579 if (debug_linux_nat
)
3580 fprintf_unfiltered (gdb_stdlog
,
3581 "LLW: %s %s, %s (preempt 'handle')\n",
3583 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3584 target_pid_to_str (lp
->ptid
),
3585 (signo
!= TARGET_SIGNAL_0
3586 ? strsignal (target_signal_to_host (signo
))
3594 /* Only do the below in all-stop, as we currently use SIGINT
3595 to implement target_stop (see linux_nat_stop) in
3597 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3599 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3600 forwarded to the entire process group, that is, all LWPs
3601 will receive it - unless they're using CLONE_THREAD to
3602 share signals. Since we only want to report it once, we
3603 mark it as ignored for all LWPs except this one. */
3604 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3605 set_ignore_sigint
, NULL
);
3606 lp
->ignore_sigint
= 0;
3609 maybe_clear_ignore_sigint (lp
);
3613 /* This LWP is stopped now. */
3616 if (debug_linux_nat
)
3617 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3618 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3622 /* Now stop all other LWP's ... */
3623 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3625 /* ... and wait until all of them have reported back that
3626 they're no longer running. */
3627 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3629 /* If we're not waiting for a specific LWP, choose an event LWP
3630 from among those that have had events. Giving equal priority
3631 to all LWPs that have had events helps prevent
3634 select_event_lwp (ptid
, &lp
, &status
);
3636 /* Now that we've selected our final event LWP, cancel any
3637 breakpoints in other LWPs that have hit a GDB breakpoint.
3638 See the comment in cancel_breakpoints_callback to find out
3640 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3642 /* In all-stop, from the core's perspective, all LWPs are now
3643 stopped until a new resume action is sent over. */
3644 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
3649 if (linux_nat_status_is_event (status
))
3651 if (debug_linux_nat
)
3652 fprintf_unfiltered (gdb_stdlog
,
3653 "LLW: trap ptid is %s.\n",
3654 target_pid_to_str (lp
->ptid
));
3657 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3659 *ourstatus
= lp
->waitstatus
;
3660 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3663 store_waitstatus (ourstatus
, status
);
3665 if (debug_linux_nat_async
)
3666 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3668 restore_child_signals_mask (&prev_mask
);
3670 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
3671 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
3674 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3679 /* Resume LWPs that are currently stopped without any pending status
3680 to report, but are resumed from the core's perspective. */
3683 resume_stopped_resumed_lwps (struct lwp_info
*lp
, void *data
)
3685 ptid_t
*wait_ptid_p
= data
;
3690 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3692 gdb_assert (is_executing (lp
->ptid
));
3694 /* Don't bother if there's a breakpoint at PC that we'd hit
3695 immediately, and we're not waiting for this LWP. */
3696 if (!ptid_match (lp
->ptid
, *wait_ptid_p
))
3698 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
3699 CORE_ADDR pc
= regcache_read_pc (regcache
);
3701 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3705 if (debug_linux_nat
)
3706 fprintf_unfiltered (gdb_stdlog
,
3707 "RSRL: resuming stopped-resumed LWP %s\n",
3708 target_pid_to_str (lp
->ptid
));
3710 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3711 lp
->step
, TARGET_SIGNAL_0
);
3713 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
3714 lp
->stopped_by_watchpoint
= 0;
3721 linux_nat_wait (struct target_ops
*ops
,
3722 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3727 if (debug_linux_nat
)
3728 fprintf_unfiltered (gdb_stdlog
,
3729 "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3731 /* Flush the async file first. */
3732 if (target_can_async_p ())
3733 async_file_flush ();
3735 /* Resume LWPs that are currently stopped without any pending status
3736 to report, but are resumed from the core's perspective. LWPs get
3737 in this state if we find them stopping at a time we're not
3738 interested in reporting the event (target_wait on a
3739 specific_process, for example, see linux_nat_wait_1), and
3740 meanwhile the event became uninteresting. Don't bother resuming
3741 LWPs we're not going to wait for if they'd stop immediately. */
3743 iterate_over_lwps (minus_one_ptid
, resume_stopped_resumed_lwps
, &ptid
);
3745 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3747 /* If we requested any event, and something came out, assume there
3748 may be more. If we requested a specific lwp or process, also
3749 assume there may be more. */
3750 if (target_can_async_p ()
3751 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3752 || !ptid_equal (ptid
, minus_one_ptid
)))
3755 /* Get ready for the next event. */
3756 if (target_can_async_p ())
3757 target_async (inferior_event_handler
, 0);
3763 kill_callback (struct lwp_info
*lp
, void *data
)
3766 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3767 if (debug_linux_nat
)
3768 fprintf_unfiltered (gdb_stdlog
,
3769 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3770 target_pid_to_str (lp
->ptid
),
3771 errno
? safe_strerror (errno
) : "OK");
3777 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3781 /* We must make sure that there are no pending events (delayed
3782 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3783 program doesn't interfere with any following debugging session. */
3785 /* For cloned processes we must check both with __WCLONE and
3786 without, since the exit status of a cloned process isn't reported
3792 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3793 if (pid
!= (pid_t
) -1)
3795 if (debug_linux_nat
)
3796 fprintf_unfiltered (gdb_stdlog
,
3797 "KWC: wait %s received unknown.\n",
3798 target_pid_to_str (lp
->ptid
));
3799 /* The Linux kernel sometimes fails to kill a thread
3800 completely after PTRACE_KILL; that goes from the stop
3801 point in do_fork out to the one in
3802 get_signal_to_deliever and waits again. So kill it
3804 kill_callback (lp
, NULL
);
3807 while (pid
== GET_LWP (lp
->ptid
));
3809 gdb_assert (pid
== -1 && errno
== ECHILD
);
3814 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3815 if (pid
!= (pid_t
) -1)
3817 if (debug_linux_nat
)
3818 fprintf_unfiltered (gdb_stdlog
,
3819 "KWC: wait %s received unk.\n",
3820 target_pid_to_str (lp
->ptid
));
3821 /* See the call to kill_callback above. */
3822 kill_callback (lp
, NULL
);
3825 while (pid
== GET_LWP (lp
->ptid
));
3827 gdb_assert (pid
== -1 && errno
== ECHILD
);
3832 linux_nat_kill (struct target_ops
*ops
)
3834 struct target_waitstatus last
;
3838 /* If we're stopped while forking and we haven't followed yet,
3839 kill the other task. We need to do this first because the
3840 parent will be sleeping if this is a vfork. */
3842 get_last_target_status (&last_ptid
, &last
);
3844 if (last
.kind
== TARGET_WAITKIND_FORKED
3845 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3847 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3851 if (forks_exist_p ())
3852 linux_fork_killall ();
3855 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3857 /* Stop all threads before killing them, since ptrace requires
3858 that the thread is stopped to sucessfully PTRACE_KILL. */
3859 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3860 /* ... and wait until all of them have reported back that
3861 they're no longer running. */
3862 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3864 /* Kill all LWP's ... */
3865 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3867 /* ... and wait until we've flushed all events. */
3868 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3871 target_mourn_inferior ();
3875 linux_nat_mourn_inferior (struct target_ops
*ops
)
3877 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3879 if (! forks_exist_p ())
3880 /* Normal case, no other forks available. */
3881 linux_ops
->to_mourn_inferior (ops
);
3883 /* Multi-fork case. The current inferior_ptid has exited, but
3884 there are other viable forks to debug. Delete the exiting
3885 one and context-switch to the first available. */
3886 linux_fork_mourn_inferior ();
3889 /* Convert a native/host siginfo object, into/from the siginfo in the
3890 layout of the inferiors' architecture. */
3893 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3897 if (linux_nat_siginfo_fixup
!= NULL
)
3898 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3900 /* If there was no callback, or the callback didn't do anything,
3901 then just do a straight memcpy. */
3905 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3907 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3912 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3913 const char *annex
, gdb_byte
*readbuf
,
3914 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3917 struct siginfo siginfo
;
3918 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3920 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3921 gdb_assert (readbuf
|| writebuf
);
3923 pid
= GET_LWP (inferior_ptid
);
3925 pid
= GET_PID (inferior_ptid
);
3927 if (offset
> sizeof (siginfo
))
3931 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3935 /* When GDB is built as a 64-bit application, ptrace writes into
3936 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3937 inferior with a 64-bit GDB should look the same as debugging it
3938 with a 32-bit GDB, we need to convert it. GDB core always sees
3939 the converted layout, so any read/write will have to be done
3941 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3943 if (offset
+ len
> sizeof (siginfo
))
3944 len
= sizeof (siginfo
) - offset
;
3946 if (readbuf
!= NULL
)
3947 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3950 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3952 /* Convert back to ptrace layout before flushing it out. */
3953 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3956 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3965 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
3966 const char *annex
, gdb_byte
*readbuf
,
3967 const gdb_byte
*writebuf
,
3968 ULONGEST offset
, LONGEST len
)
3970 struct cleanup
*old_chain
;
3973 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
3974 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
3977 /* The target is connected but no live inferior is selected. Pass
3978 this request down to a lower stratum (e.g., the executable
3980 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
3983 old_chain
= save_inferior_ptid ();
3985 if (is_lwp (inferior_ptid
))
3986 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
3988 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
3991 do_cleanups (old_chain
);
3996 linux_thread_alive (ptid_t ptid
)
4000 gdb_assert (is_lwp (ptid
));
4002 /* Send signal 0 instead of anything ptrace, because ptracing a
4003 running thread errors out claiming that the thread doesn't
4005 err
= kill_lwp (GET_LWP (ptid
), 0);
4007 if (debug_linux_nat
)
4008 fprintf_unfiltered (gdb_stdlog
,
4009 "LLTA: KILL(SIG0) %s (%s)\n",
4010 target_pid_to_str (ptid
),
4011 err
? safe_strerror (tmp_errno
) : "OK");
4020 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
4022 return linux_thread_alive (ptid
);
4026 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
4028 static char buf
[64];
4031 && (GET_PID (ptid
) != GET_LWP (ptid
)
4032 || num_lwps (GET_PID (ptid
)) > 1))
4034 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
4038 return normal_pid_to_str (ptid
);
4042 linux_nat_thread_name (struct thread_info
*thr
)
4044 int pid
= ptid_get_pid (thr
->ptid
);
4045 long lwp
= ptid_get_lwp (thr
->ptid
);
4046 #define FORMAT "/proc/%d/task/%ld/comm"
4047 char buf
[sizeof (FORMAT
) + 30];
4049 char *result
= NULL
;
4051 snprintf (buf
, sizeof (buf
), FORMAT
, pid
, lwp
);
4052 comm_file
= fopen (buf
, "r");
4055 /* Not exported by the kernel, so we define it here. */
4057 static char line
[COMM_LEN
+ 1];
4059 if (fgets (line
, sizeof (line
), comm_file
))
4061 char *nl
= strchr (line
, '\n');
4078 /* Accepts an integer PID; Returns a string representing a file that
4079 can be opened to get the symbols for the child process. */
4082 linux_child_pid_to_exec_file (int pid
)
4084 char *name1
, *name2
;
4086 name1
= xmalloc (MAXPATHLEN
);
4087 name2
= xmalloc (MAXPATHLEN
);
4088 make_cleanup (xfree
, name1
);
4089 make_cleanup (xfree
, name2
);
4090 memset (name2
, 0, MAXPATHLEN
);
4092 sprintf (name1
, "/proc/%d/exe", pid
);
4093 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
4099 /* Service function for corefiles and info proc. */
4102 read_mapping (FILE *mapfile
,
4107 char *device
, long long *inode
, char *filename
)
4109 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
4110 addr
, endaddr
, permissions
, offset
, device
, inode
);
4113 if (ret
> 0 && ret
!= EOF
)
4115 /* Eat everything up to EOL for the filename. This will prevent
4116 weird filenames (such as one with embedded whitespace) from
4117 confusing this code. It also makes this code more robust in
4118 respect to annotations the kernel may add after the filename.
4120 Note the filename is used for informational purposes
4122 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4125 return (ret
!= 0 && ret
!= EOF
);
4128 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4129 regions in the inferior for a corefile. */
4132 linux_nat_find_memory_regions (find_memory_region_ftype func
, void *obfd
)
4134 int pid
= PIDGET (inferior_ptid
);
4135 char mapsfilename
[MAXPATHLEN
];
4137 long long addr
, endaddr
, size
, offset
, inode
;
4138 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4139 int read
, write
, exec
;
4140 struct cleanup
*cleanup
;
4142 /* Compose the filename for the /proc memory map, and open it. */
4143 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4144 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4145 error (_("Could not open %s."), mapsfilename
);
4146 cleanup
= make_cleanup_fclose (mapsfile
);
4149 fprintf_filtered (gdb_stdout
,
4150 "Reading memory regions from %s\n", mapsfilename
);
4152 /* Now iterate until end-of-file. */
4153 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4154 &offset
, &device
[0], &inode
, &filename
[0]))
4156 size
= endaddr
- addr
;
4158 /* Get the segment's permissions. */
4159 read
= (strchr (permissions
, 'r') != 0);
4160 write
= (strchr (permissions
, 'w') != 0);
4161 exec
= (strchr (permissions
, 'x') != 0);
4165 fprintf_filtered (gdb_stdout
,
4166 "Save segment, %s bytes at %s (%c%c%c)",
4167 plongest (size
), paddress (target_gdbarch
, addr
),
4169 write
? 'w' : ' ', exec
? 'x' : ' ');
4171 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4172 fprintf_filtered (gdb_stdout
, "\n");
4175 /* Invoke the callback function to create the corefile
4177 func (addr
, size
, read
, write
, exec
, obfd
);
4179 do_cleanups (cleanup
);
4184 find_signalled_thread (struct thread_info
*info
, void *data
)
4186 if (info
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4187 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4193 static enum target_signal
4194 find_stop_signal (void)
4196 struct thread_info
*info
=
4197 iterate_over_threads (find_signalled_thread
, NULL
);
4200 return info
->suspend
.stop_signal
;
4202 return TARGET_SIGNAL_0
;
4205 /* Records the thread's register state for the corefile note
4209 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4210 char *note_data
, int *note_size
,
4211 enum target_signal stop_signal
)
4213 unsigned long lwp
= ptid_get_lwp (ptid
);
4214 struct gdbarch
*gdbarch
= target_gdbarch
;
4215 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4216 const struct regset
*regset
;
4218 struct cleanup
*old_chain
;
4219 struct core_regset_section
*sect_list
;
4222 old_chain
= save_inferior_ptid ();
4223 inferior_ptid
= ptid
;
4224 target_fetch_registers (regcache
, -1);
4225 do_cleanups (old_chain
);
4227 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4228 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4230 /* The loop below uses the new struct core_regset_section, which stores
4231 the supported section names and sizes for the core file. Note that
4232 note PRSTATUS needs to be treated specially. But the other notes are
4233 structurally the same, so they can benefit from the new struct. */
4234 if (core_regset_p
&& sect_list
!= NULL
)
4235 while (sect_list
->sect_name
!= NULL
)
4237 regset
= gdbarch_regset_from_core_section (gdbarch
,
4238 sect_list
->sect_name
,
4240 gdb_assert (regset
&& regset
->collect_regset
);
4241 gdb_regset
= xmalloc (sect_list
->size
);
4242 regset
->collect_regset (regset
, regcache
, -1,
4243 gdb_regset
, sect_list
->size
);
4245 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4246 note_data
= (char *) elfcore_write_prstatus
4247 (obfd
, note_data
, note_size
,
4248 lwp
, target_signal_to_host (stop_signal
),
4251 note_data
= (char *) elfcore_write_register_note
4252 (obfd
, note_data
, note_size
,
4253 sect_list
->sect_name
, gdb_regset
,
4259 /* For architectures that does not have the struct core_regset_section
4260 implemented, we use the old method. When all the architectures have
4261 the new support, the code below should be deleted. */
4264 gdb_gregset_t gregs
;
4265 gdb_fpregset_t fpregs
;
4268 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4270 != NULL
&& regset
->collect_regset
!= NULL
)
4271 regset
->collect_regset (regset
, regcache
, -1,
4272 &gregs
, sizeof (gregs
));
4274 fill_gregset (regcache
, &gregs
, -1);
4276 note_data
= (char *) elfcore_write_prstatus
4277 (obfd
, note_data
, note_size
, lwp
, target_signal_to_host (stop_signal
),
4281 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4283 != NULL
&& regset
->collect_regset
!= NULL
)
4284 regset
->collect_regset (regset
, regcache
, -1,
4285 &fpregs
, sizeof (fpregs
));
4287 fill_fpregset (regcache
, &fpregs
, -1);
4289 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4292 &fpregs
, sizeof (fpregs
));
4298 struct linux_nat_corefile_thread_data
4304 enum target_signal stop_signal
;
4307 /* Called by gdbthread.c once per thread. Records the thread's
4308 register state for the corefile note section. */
4311 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4313 struct linux_nat_corefile_thread_data
*args
= data
;
4315 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4325 /* Enumerate spufs IDs for process PID. */
4328 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4332 struct dirent
*entry
;
4334 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4335 dir
= opendir (path
);
4340 while ((entry
= readdir (dir
)) != NULL
)
4346 fd
= atoi (entry
->d_name
);
4350 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4351 if (stat (path
, &st
) != 0)
4353 if (!S_ISDIR (st
.st_mode
))
4356 if (statfs (path
, &stfs
) != 0)
4358 if (stfs
.f_type
!= SPUFS_MAGIC
)
4361 callback (data
, fd
);
4367 /* Generate corefile notes for SPU contexts. */
4369 struct linux_spu_corefile_data
4377 linux_spu_corefile_callback (void *data
, int fd
)
4379 struct linux_spu_corefile_data
*args
= data
;
4382 static const char *spu_files
[] =
4404 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4406 char annex
[32], note_name
[32];
4410 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4411 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4415 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4416 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4417 args
->note_size
, note_name
,
4418 NT_SPU
, spu_data
, spu_len
);
4425 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4427 struct linux_spu_corefile_data args
;
4430 args
.note_data
= note_data
;
4431 args
.note_size
= note_size
;
4433 iterate_over_spus (PIDGET (inferior_ptid
),
4434 linux_spu_corefile_callback
, &args
);
4436 return args
.note_data
;
4439 /* Fills the "to_make_corefile_note" target vector. Builds the note
4440 section for a corefile, and returns it in a malloc buffer. */
4443 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4445 struct linux_nat_corefile_thread_data thread_args
;
4446 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4447 char fname
[16] = { '\0' };
4448 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4449 char psargs
[80] = { '\0' };
4450 char *note_data
= NULL
;
4451 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4455 if (get_exec_file (0))
4457 strncpy (fname
, lbasename (get_exec_file (0)), sizeof (fname
));
4458 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4459 if (get_inferior_args ())
4462 char *psargs_end
= psargs
+ sizeof (psargs
);
4464 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4466 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4467 if (string_end
!= NULL
)
4469 *string_end
++ = ' ';
4470 strncpy (string_end
, get_inferior_args (),
4471 psargs_end
- string_end
);
4474 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4476 note_size
, fname
, psargs
);
4479 /* Dump information for threads. */
4480 thread_args
.obfd
= obfd
;
4481 thread_args
.note_data
= note_data
;
4482 thread_args
.note_size
= note_size
;
4483 thread_args
.num_notes
= 0;
4484 thread_args
.stop_signal
= find_stop_signal ();
4485 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4486 gdb_assert (thread_args
.num_notes
!= 0);
4487 note_data
= thread_args
.note_data
;
4489 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4493 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4494 "CORE", NT_AUXV
, auxv
, auxv_len
);
4498 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4500 make_cleanup (xfree
, note_data
);
4504 /* Implement the "info proc" command. */
4507 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4509 /* A long is used for pid instead of an int to avoid a loss of precision
4510 compiler warning from the output of strtoul. */
4511 long pid
= PIDGET (inferior_ptid
);
4514 char buffer
[MAXPATHLEN
];
4515 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4527 /* Break up 'args' into an argv array. */
4528 argv
= gdb_buildargv (args
);
4529 make_cleanup_freeargv (argv
);
4531 while (argv
!= NULL
&& *argv
!= NULL
)
4533 if (isdigit (argv
[0][0]))
4535 pid
= strtoul (argv
[0], NULL
, 10);
4537 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4541 else if (strcmp (argv
[0], "status") == 0)
4545 else if (strcmp (argv
[0], "stat") == 0)
4549 else if (strcmp (argv
[0], "cmd") == 0)
4553 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4557 else if (strcmp (argv
[0], "cwd") == 0)
4561 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4567 /* [...] (future options here). */
4572 error (_("No current process: you must name one."));
4574 sprintf (fname1
, "/proc/%ld", pid
);
4575 if (stat (fname1
, &dummy
) != 0)
4576 error (_("No /proc directory: '%s'"), fname1
);
4578 printf_filtered (_("process %ld\n"), pid
);
4579 if (cmdline_f
|| all
)
4581 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4582 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4584 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4586 if (fgets (buffer
, sizeof (buffer
), procfile
))
4587 printf_filtered ("cmdline = '%s'\n", buffer
);
4589 warning (_("unable to read '%s'"), fname1
);
4590 do_cleanups (cleanup
);
4593 warning (_("unable to open /proc file '%s'"), fname1
);
4597 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4598 memset (fname2
, 0, sizeof (fname2
));
4599 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4600 printf_filtered ("cwd = '%s'\n", fname2
);
4602 warning (_("unable to read link '%s'"), fname1
);
4606 sprintf (fname1
, "/proc/%ld/exe", pid
);
4607 memset (fname2
, 0, sizeof (fname2
));
4608 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4609 printf_filtered ("exe = '%s'\n", fname2
);
4611 warning (_("unable to read link '%s'"), fname1
);
4613 if (mappings_f
|| all
)
4615 sprintf (fname1
, "/proc/%ld/maps", pid
);
4616 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4618 long long addr
, endaddr
, size
, offset
, inode
;
4619 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4620 struct cleanup
*cleanup
;
4622 cleanup
= make_cleanup_fclose (procfile
);
4623 printf_filtered (_("Mapped address spaces:\n\n"));
4624 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4626 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4629 " Size", " Offset", "objfile");
4633 printf_filtered (" %18s %18s %10s %10s %7s\n",
4636 " Size", " Offset", "objfile");
4639 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4640 &offset
, &device
[0], &inode
, &filename
[0]))
4642 size
= endaddr
- addr
;
4644 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4645 calls here (and possibly above) should be abstracted
4646 out into their own functions? Andrew suggests using
4647 a generic local_address_string instead to print out
4648 the addresses; that makes sense to me, too. */
4650 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4652 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4653 (unsigned long) addr
, /* FIXME: pr_addr */
4654 (unsigned long) endaddr
,
4656 (unsigned int) offset
,
4657 filename
[0] ? filename
: "");
4661 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4662 (unsigned long) addr
, /* FIXME: pr_addr */
4663 (unsigned long) endaddr
,
4665 (unsigned int) offset
,
4666 filename
[0] ? filename
: "");
4670 do_cleanups (cleanup
);
4673 warning (_("unable to open /proc file '%s'"), fname1
);
4675 if (status_f
|| all
)
4677 sprintf (fname1
, "/proc/%ld/status", pid
);
4678 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4680 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4682 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4683 puts_filtered (buffer
);
4684 do_cleanups (cleanup
);
4687 warning (_("unable to open /proc file '%s'"), fname1
);
4691 sprintf (fname1
, "/proc/%ld/stat", pid
);
4692 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4697 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4699 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4700 printf_filtered (_("Process: %d\n"), itmp
);
4701 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4702 printf_filtered (_("Exec file: %s\n"), buffer
);
4703 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4704 printf_filtered (_("State: %c\n"), ctmp
);
4705 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4706 printf_filtered (_("Parent process: %d\n"), itmp
);
4707 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4708 printf_filtered (_("Process group: %d\n"), itmp
);
4709 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4710 printf_filtered (_("Session id: %d\n"), itmp
);
4711 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4712 printf_filtered (_("TTY: %d\n"), itmp
);
4713 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4714 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4715 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4716 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4717 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4718 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4719 (unsigned long) ltmp
);
4720 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4721 printf_filtered (_("Minor faults, children: %lu\n"),
4722 (unsigned long) ltmp
);
4723 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4724 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4725 (unsigned long) ltmp
);
4726 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4727 printf_filtered (_("Major faults, children: %lu\n"),
4728 (unsigned long) ltmp
);
4729 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4730 printf_filtered (_("utime: %ld\n"), ltmp
);
4731 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4732 printf_filtered (_("stime: %ld\n"), ltmp
);
4733 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4734 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4735 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4736 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4737 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4738 printf_filtered (_("jiffies remaining in current "
4739 "time slice: %ld\n"), ltmp
);
4740 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4741 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4742 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4743 printf_filtered (_("jiffies until next timeout: %lu\n"),
4744 (unsigned long) ltmp
);
4745 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4746 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4747 (unsigned long) ltmp
);
4748 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4749 printf_filtered (_("start time (jiffies since "
4750 "system boot): %ld\n"), ltmp
);
4751 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4752 printf_filtered (_("Virtual memory size: %lu\n"),
4753 (unsigned long) ltmp
);
4754 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4755 printf_filtered (_("Resident set size: %lu\n"),
4756 (unsigned long) ltmp
);
4757 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4758 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4759 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4760 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4761 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4762 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4763 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4764 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4765 #if 0 /* Don't know how architecture-dependent the rest is...
4766 Anyway the signal bitmap info is available from "status". */
4767 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4768 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4769 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4770 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4771 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4772 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4773 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4774 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4775 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4776 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4777 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4778 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4779 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4780 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4782 do_cleanups (cleanup
);
4785 warning (_("unable to open /proc file '%s'"), fname1
);
4789 /* Implement the to_xfer_partial interface for memory reads using the /proc
4790 filesystem. Because we can use a single read() call for /proc, this
4791 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4792 but it doesn't support writes. */
4795 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4796 const char *annex
, gdb_byte
*readbuf
,
4797 const gdb_byte
*writebuf
,
4798 ULONGEST offset
, LONGEST len
)
4804 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4807 /* Don't bother for one word. */
4808 if (len
< 3 * sizeof (long))
4811 /* We could keep this file open and cache it - possibly one per
4812 thread. That requires some juggling, but is even faster. */
4813 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4814 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4818 /* If pread64 is available, use it. It's faster if the kernel
4819 supports it (only one syscall), and it's 64-bit safe even on
4820 32-bit platforms (for instance, SPARC debugging a SPARC64
4823 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4825 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4836 /* Enumerate spufs IDs for process PID. */
4838 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4840 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4842 LONGEST written
= 0;
4845 struct dirent
*entry
;
4847 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4848 dir
= opendir (path
);
4853 while ((entry
= readdir (dir
)) != NULL
)
4859 fd
= atoi (entry
->d_name
);
4863 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4864 if (stat (path
, &st
) != 0)
4866 if (!S_ISDIR (st
.st_mode
))
4869 if (statfs (path
, &stfs
) != 0)
4871 if (stfs
.f_type
!= SPUFS_MAGIC
)
4874 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4876 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4886 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4887 object type, using the /proc file system. */
4889 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4890 const char *annex
, gdb_byte
*readbuf
,
4891 const gdb_byte
*writebuf
,
4892 ULONGEST offset
, LONGEST len
)
4897 int pid
= PIDGET (inferior_ptid
);
4904 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4907 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4908 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4913 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4920 ret
= write (fd
, writebuf
, (size_t) len
);
4922 ret
= read (fd
, readbuf
, (size_t) len
);
4929 /* Parse LINE as a signal set and add its set bits to SIGS. */
4932 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4934 int len
= strlen (line
) - 1;
4938 if (line
[len
] != '\n')
4939 error (_("Could not parse signal set: %s"), line
);
4947 if (*p
>= '0' && *p
<= '9')
4949 else if (*p
>= 'a' && *p
<= 'f')
4950 digit
= *p
- 'a' + 10;
4952 error (_("Could not parse signal set: %s"), line
);
4957 sigaddset (sigs
, signum
+ 1);
4959 sigaddset (sigs
, signum
+ 2);
4961 sigaddset (sigs
, signum
+ 3);
4963 sigaddset (sigs
, signum
+ 4);
4969 /* Find process PID's pending signals from /proc/pid/status and set
4973 linux_proc_pending_signals (int pid
, sigset_t
*pending
,
4974 sigset_t
*blocked
, sigset_t
*ignored
)
4977 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
4978 struct cleanup
*cleanup
;
4980 sigemptyset (pending
);
4981 sigemptyset (blocked
);
4982 sigemptyset (ignored
);
4983 sprintf (fname
, "/proc/%d/status", pid
);
4984 procfile
= fopen (fname
, "r");
4985 if (procfile
== NULL
)
4986 error (_("Could not open %s"), fname
);
4987 cleanup
= make_cleanup_fclose (procfile
);
4989 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
4991 /* Normal queued signals are on the SigPnd line in the status
4992 file. However, 2.6 kernels also have a "shared" pending
4993 queue for delivering signals to a thread group, so check for
4996 Unfortunately some Red Hat kernels include the shared pending
4997 queue but not the ShdPnd status field. */
4999 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
5000 add_line_to_sigset (buffer
+ 8, pending
);
5001 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
5002 add_line_to_sigset (buffer
+ 8, pending
);
5003 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
5004 add_line_to_sigset (buffer
+ 8, blocked
);
5005 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
5006 add_line_to_sigset (buffer
+ 8, ignored
);
5009 do_cleanups (cleanup
);
5013 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
5014 const char *annex
, gdb_byte
*readbuf
,
5015 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5017 /* We make the process list snapshot when the object starts to be
5019 static const char *buf
;
5020 static LONGEST len_avail
= -1;
5021 static struct obstack obstack
;
5025 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
5031 if (len_avail
!= -1 && len_avail
!= 0)
5032 obstack_free (&obstack
, NULL
);
5035 obstack_init (&obstack
);
5036 obstack_grow_str (&obstack
, "<osdata type=\"types\">\n");
5038 obstack_xml_printf (&obstack
,
5040 "<column name=\"Type\">processes</column>"
5041 "<column name=\"Description\">"
5042 "Listing of all processes</column>"
5045 obstack_grow_str0 (&obstack
, "</osdata>\n");
5046 buf
= obstack_finish (&obstack
);
5047 len_avail
= strlen (buf
);
5050 if (offset
>= len_avail
)
5052 /* Done. Get rid of the obstack. */
5053 obstack_free (&obstack
, NULL
);
5059 if (len
> len_avail
- offset
)
5060 len
= len_avail
- offset
;
5061 memcpy (readbuf
, buf
+ offset
, len
);
5066 if (strcmp (annex
, "processes") != 0)
5069 gdb_assert (readbuf
&& !writebuf
);
5073 if (len_avail
!= -1 && len_avail
!= 0)
5074 obstack_free (&obstack
, NULL
);
5077 obstack_init (&obstack
);
5078 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
5080 dirp
= opendir ("/proc");
5085 while ((dp
= readdir (dirp
)) != NULL
)
5087 struct stat statbuf
;
5088 char procentry
[sizeof ("/proc/4294967295")];
5090 if (!isdigit (dp
->d_name
[0])
5091 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
5094 sprintf (procentry
, "/proc/%s", dp
->d_name
);
5095 if (stat (procentry
, &statbuf
) == 0
5096 && S_ISDIR (statbuf
.st_mode
))
5100 char cmd
[MAXPATHLEN
+ 1];
5101 struct passwd
*entry
;
5103 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
5104 entry
= getpwuid (statbuf
.st_uid
);
5106 if ((f
= fopen (pathname
, "r")) != NULL
)
5108 size_t length
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
5114 for (i
= 0; i
< length
; i
++)
5119 obstack_xml_printf (
5122 "<column name=\"pid\">%s</column>"
5123 "<column name=\"user\">%s</column>"
5124 "<column name=\"command\">%s</column>"
5127 entry
? entry
->pw_name
: "?",
5140 obstack_grow_str0 (&obstack
, "</osdata>\n");
5141 buf
= obstack_finish (&obstack
);
5142 len_avail
= strlen (buf
);
5145 if (offset
>= len_avail
)
5147 /* Done. Get rid of the obstack. */
5148 obstack_free (&obstack
, NULL
);
5154 if (len
> len_avail
- offset
)
5155 len
= len_avail
- offset
;
5156 memcpy (readbuf
, buf
+ offset
, len
);
5162 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5163 const char *annex
, gdb_byte
*readbuf
,
5164 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5168 if (object
== TARGET_OBJECT_AUXV
)
5169 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5172 if (object
== TARGET_OBJECT_OSDATA
)
5173 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5176 if (object
== TARGET_OBJECT_SPU
)
5177 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5180 /* GDB calculates all the addresses in possibly larget width of the address.
5181 Address width needs to be masked before its final use - either by
5182 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5184 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5186 if (object
== TARGET_OBJECT_MEMORY
)
5188 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5190 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5191 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5194 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5199 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5203 /* Create a prototype generic GNU/Linux target. The client can override
5204 it with local methods. */
5207 linux_target_install_ops (struct target_ops
*t
)
5209 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5210 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5211 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5212 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5213 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5214 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5215 t
->to_post_attach
= linux_child_post_attach
;
5216 t
->to_follow_fork
= linux_child_follow_fork
;
5217 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5218 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5220 super_xfer_partial
= t
->to_xfer_partial
;
5221 t
->to_xfer_partial
= linux_xfer_partial
;
5227 struct target_ops
*t
;
5229 t
= inf_ptrace_target ();
5230 linux_target_install_ops (t
);
5236 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5238 struct target_ops
*t
;
5240 t
= inf_ptrace_trad_target (register_u_offset
);
5241 linux_target_install_ops (t
);
5246 /* target_is_async_p implementation. */
5249 linux_nat_is_async_p (void)
5251 /* NOTE: palves 2008-03-21: We're only async when the user requests
5252 it explicitly with the "set target-async" command.
5253 Someday, linux will always be async. */
5254 if (!target_async_permitted
)
5257 /* See target.h/target_async_mask. */
5258 return linux_nat_async_mask_value
;
5261 /* target_can_async_p implementation. */
5264 linux_nat_can_async_p (void)
5266 /* NOTE: palves 2008-03-21: We're only async when the user requests
5267 it explicitly with the "set target-async" command.
5268 Someday, linux will always be async. */
5269 if (!target_async_permitted
)
5272 /* See target.h/target_async_mask. */
5273 return linux_nat_async_mask_value
;
5277 linux_nat_supports_non_stop (void)
5282 /* True if we want to support multi-process. To be removed when GDB
5283 supports multi-exec. */
5285 int linux_multi_process
= 1;
5288 linux_nat_supports_multi_process (void)
5290 return linux_multi_process
;
5293 /* target_async_mask implementation. */
5296 linux_nat_async_mask (int new_mask
)
5298 int curr_mask
= linux_nat_async_mask_value
;
5300 if (curr_mask
!= new_mask
)
5304 linux_nat_async (NULL
, 0);
5305 linux_nat_async_mask_value
= new_mask
;
5309 linux_nat_async_mask_value
= new_mask
;
5311 /* If we're going out of async-mask in all-stop, then the
5312 inferior is stopped. The next resume will call
5313 target_async. In non-stop, the target event source
5314 should be always registered in the event loop. Do so
5317 linux_nat_async (inferior_event_handler
, 0);
5324 static int async_terminal_is_ours
= 1;
5326 /* target_terminal_inferior implementation. */
5329 linux_nat_terminal_inferior (void)
5331 if (!target_is_async_p ())
5333 /* Async mode is disabled. */
5334 terminal_inferior ();
5338 terminal_inferior ();
5340 /* Calls to target_terminal_*() are meant to be idempotent. */
5341 if (!async_terminal_is_ours
)
5344 delete_file_handler (input_fd
);
5345 async_terminal_is_ours
= 0;
5349 /* target_terminal_ours implementation. */
5352 linux_nat_terminal_ours (void)
5354 if (!target_is_async_p ())
5356 /* Async mode is disabled. */
5361 /* GDB should never give the terminal to the inferior if the
5362 inferior is running in the background (run&, continue&, etc.),
5363 but claiming it sure should. */
5366 if (async_terminal_is_ours
)
5369 clear_sigint_trap ();
5370 add_file_handler (input_fd
, stdin_event_handler
, 0);
5371 async_terminal_is_ours
= 1;
5374 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5376 static void *async_client_context
;
5378 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5379 so we notice when any child changes state, and notify the
5380 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5381 above to wait for the arrival of a SIGCHLD. */
5384 sigchld_handler (int signo
)
5386 int old_errno
= errno
;
5388 if (debug_linux_nat_async
)
5389 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5391 if (signo
== SIGCHLD
5392 && linux_nat_event_pipe
[0] != -1)
5393 async_file_mark (); /* Let the event loop know that there are
5394 events to handle. */
5399 /* Callback registered with the target events file descriptor. */
5402 handle_target_event (int error
, gdb_client_data client_data
)
5404 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5407 /* Create/destroy the target events pipe. Returns previous state. */
5410 linux_async_pipe (int enable
)
5412 int previous
= (linux_nat_event_pipe
[0] != -1);
5414 if (previous
!= enable
)
5418 block_child_signals (&prev_mask
);
5422 if (pipe (linux_nat_event_pipe
) == -1)
5423 internal_error (__FILE__
, __LINE__
,
5424 "creating event pipe failed.");
5426 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5427 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5431 close (linux_nat_event_pipe
[0]);
5432 close (linux_nat_event_pipe
[1]);
5433 linux_nat_event_pipe
[0] = -1;
5434 linux_nat_event_pipe
[1] = -1;
5437 restore_child_signals_mask (&prev_mask
);
5443 /* target_async implementation. */
5446 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5447 void *context
), void *context
)
5449 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5450 internal_error (__FILE__
, __LINE__
,
5451 "Calling target_async when async is masked");
5453 if (callback
!= NULL
)
5455 async_client_callback
= callback
;
5456 async_client_context
= context
;
5457 if (!linux_async_pipe (1))
5459 add_file_handler (linux_nat_event_pipe
[0],
5460 handle_target_event
, NULL
);
5461 /* There may be pending events to handle. Tell the event loop
5468 async_client_callback
= callback
;
5469 async_client_context
= context
;
5470 delete_file_handler (linux_nat_event_pipe
[0]);
5471 linux_async_pipe (0);
5476 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5480 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5484 ptid_t ptid
= lwp
->ptid
;
5486 if (debug_linux_nat
)
5487 fprintf_unfiltered (gdb_stdlog
,
5488 "LNSL: running -> suspending %s\n",
5489 target_pid_to_str (lwp
->ptid
));
5492 stop_callback (lwp
, NULL
);
5493 stop_wait_callback (lwp
, NULL
);
5495 /* If the lwp exits while we try to stop it, there's nothing
5497 lwp
= find_lwp_pid (ptid
);
5501 /* If we didn't collect any signal other than SIGSTOP while
5502 stopping the LWP, push a SIGNAL_0 event. In either case, the
5503 event-loop will end up calling target_wait which will collect
5505 if (lwp
->status
== 0)
5506 lwp
->status
= W_STOPCODE (0);
5511 /* Already known to be stopped; do nothing. */
5513 if (debug_linux_nat
)
5515 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5516 fprintf_unfiltered (gdb_stdlog
,
5517 "LNSL: already stopped/stop_requested %s\n",
5518 target_pid_to_str (lwp
->ptid
));
5520 fprintf_unfiltered (gdb_stdlog
,
5521 "LNSL: already stopped/no "
5522 "stop_requested yet %s\n",
5523 target_pid_to_str (lwp
->ptid
));
5530 linux_nat_stop (ptid_t ptid
)
5533 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5535 linux_ops
->to_stop (ptid
);
5539 linux_nat_close (int quitting
)
5541 /* Unregister from the event loop. */
5542 if (target_is_async_p ())
5543 target_async (NULL
, 0);
5545 /* Reset the async_masking. */
5546 linux_nat_async_mask_value
= 1;
5548 if (linux_ops
->to_close
)
5549 linux_ops
->to_close (quitting
);
5552 /* When requests are passed down from the linux-nat layer to the
5553 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5554 used. The address space pointer is stored in the inferior object,
5555 but the common code that is passed such ptid can't tell whether
5556 lwpid is a "main" process id or not (it assumes so). We reverse
5557 look up the "main" process id from the lwp here. */
5559 struct address_space
*
5560 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5562 struct lwp_info
*lwp
;
5563 struct inferior
*inf
;
5566 pid
= GET_LWP (ptid
);
5567 if (GET_LWP (ptid
) == 0)
5569 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5571 lwp
= find_lwp_pid (ptid
);
5572 pid
= GET_PID (lwp
->ptid
);
5576 /* A (pid,lwpid,0) ptid. */
5577 pid
= GET_PID (ptid
);
5580 inf
= find_inferior_pid (pid
);
5581 gdb_assert (inf
!= NULL
);
5586 linux_nat_core_of_thread_1 (ptid_t ptid
)
5588 struct cleanup
*back_to
;
5591 char *content
= NULL
;
5594 int content_read
= 0;
5598 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5599 GET_PID (ptid
), GET_LWP (ptid
));
5600 back_to
= make_cleanup (xfree
, filename
);
5602 f
= fopen (filename
, "r");
5605 do_cleanups (back_to
);
5609 make_cleanup_fclose (f
);
5615 content
= xrealloc (content
, content_read
+ 1024);
5616 n
= fread (content
+ content_read
, 1, 1024, f
);
5620 content
[content_read
] = '\0';
5625 make_cleanup (xfree
, content
);
5627 p
= strchr (content
, '(');
5631 p
= strchr (p
, ')');
5635 /* If the first field after program name has index 0, then core number is
5636 the field with index 36. There's no constant for that anywhere. */
5638 p
= strtok_r (p
, " ", &ts
);
5639 for (i
= 0; p
!= NULL
&& i
!= 36; ++i
)
5640 p
= strtok_r (NULL
, " ", &ts
);
5642 if (p
== NULL
|| sscanf (p
, "%d", &core
) == 0)
5645 do_cleanups (back_to
);
5650 /* Return the cached value of the processor core for thread PTID. */
5653 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5655 struct lwp_info
*info
= find_lwp_pid (ptid
);
5663 linux_nat_add_target (struct target_ops
*t
)
5665 /* Save the provided single-threaded target. We save this in a separate
5666 variable because another target we've inherited from (e.g. inf-ptrace)
5667 may have saved a pointer to T; we want to use it for the final
5668 process stratum target. */
5669 linux_ops_saved
= *t
;
5670 linux_ops
= &linux_ops_saved
;
5672 /* Override some methods for multithreading. */
5673 t
->to_create_inferior
= linux_nat_create_inferior
;
5674 t
->to_attach
= linux_nat_attach
;
5675 t
->to_detach
= linux_nat_detach
;
5676 t
->to_resume
= linux_nat_resume
;
5677 t
->to_wait
= linux_nat_wait
;
5678 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5679 t
->to_kill
= linux_nat_kill
;
5680 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5681 t
->to_thread_alive
= linux_nat_thread_alive
;
5682 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5683 t
->to_thread_name
= linux_nat_thread_name
;
5684 t
->to_has_thread_control
= tc_schedlock
;
5685 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5686 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5687 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5689 t
->to_can_async_p
= linux_nat_can_async_p
;
5690 t
->to_is_async_p
= linux_nat_is_async_p
;
5691 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5692 t
->to_async
= linux_nat_async
;
5693 t
->to_async_mask
= linux_nat_async_mask
;
5694 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5695 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5696 t
->to_close
= linux_nat_close
;
5698 /* Methods for non-stop support. */
5699 t
->to_stop
= linux_nat_stop
;
5701 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5703 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5705 /* We don't change the stratum; this target will sit at
5706 process_stratum and thread_db will set at thread_stratum. This
5707 is a little strange, since this is a multi-threaded-capable
5708 target, but we want to be on the stack below thread_db, and we
5709 also want to be used for single-threaded processes. */
5714 /* Register a method to call whenever a new thread is attached. */
5716 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5718 /* Save the pointer. We only support a single registered instance
5719 of the GNU/Linux native target, so we do not need to map this to
5721 linux_nat_new_thread
= new_thread
;
5724 /* Register a method that converts a siginfo object between the layout
5725 that ptrace returns, and the layout in the architecture of the
5728 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5729 int (*siginfo_fixup
) (struct siginfo
*,
5733 /* Save the pointer. */
5734 linux_nat_siginfo_fixup
= siginfo_fixup
;
5737 /* Return the saved siginfo associated with PTID. */
5739 linux_nat_get_siginfo (ptid_t ptid
)
5741 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5743 gdb_assert (lp
!= NULL
);
5745 return &lp
->siginfo
;
5748 /* Provide a prototype to silence -Wmissing-prototypes. */
5749 extern initialize_file_ftype _initialize_linux_nat
;
5752 _initialize_linux_nat (void)
5754 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5755 Show /proc process information about any running process.\n\
5756 Specify any process id, or use the program being debugged by default.\n\
5757 Specify any of the following keywords for detailed info:\n\
5758 mappings -- list of mapped memory regions.\n\
5759 stat -- list a bunch of random process info.\n\
5760 status -- list a different bunch of random process info.\n\
5761 all -- list all available /proc info."));
5763 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5764 &debug_linux_nat
, _("\
5765 Set debugging of GNU/Linux lwp module."), _("\
5766 Show debugging of GNU/Linux lwp module."), _("\
5767 Enables printf debugging output."),
5769 show_debug_linux_nat
,
5770 &setdebuglist
, &showdebuglist
);
5772 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5773 &debug_linux_nat_async
, _("\
5774 Set debugging of GNU/Linux async lwp module."), _("\
5775 Show debugging of GNU/Linux async lwp module."), _("\
5776 Enables printf debugging output."),
5778 show_debug_linux_nat_async
,
5779 &setdebuglist
, &showdebuglist
);
5781 /* Save this mask as the default. */
5782 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5784 /* Install a SIGCHLD handler. */
5785 sigchld_action
.sa_handler
= sigchld_handler
;
5786 sigemptyset (&sigchld_action
.sa_mask
);
5787 sigchld_action
.sa_flags
= SA_RESTART
;
5789 /* Make it the default. */
5790 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5792 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5793 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5794 sigdelset (&suspend_mask
, SIGCHLD
);
5796 sigemptyset (&blocked_mask
);
5798 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5799 &disable_randomization
, _("\
5800 Set disabling of debuggee's virtual address space randomization."), _("\
5801 Show disabling of debuggee's virtual address space randomization."), _("\
5802 When this mode is on (which is the default), randomization of the virtual\n\
5803 address space is disabled. Standalone programs run with the randomization\n\
5804 enabled by default on some platforms."),
5805 &set_disable_randomization
,
5806 &show_disable_randomization
,
5807 &setlist
, &showlist
);
5811 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5812 the GNU/Linux Threads library and therefore doesn't really belong
5815 /* Read variable NAME in the target and return its value if found.
5816 Otherwise return zero. It is assumed that the type of the variable
5820 get_signo (const char *name
)
5822 struct minimal_symbol
*ms
;
5825 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5829 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5830 sizeof (signo
)) != 0)
5836 /* Return the set of signals used by the threads library in *SET. */
5839 lin_thread_get_thread_signals (sigset_t
*set
)
5841 struct sigaction action
;
5842 int restart
, cancel
;
5844 sigemptyset (&blocked_mask
);
5847 restart
= get_signo ("__pthread_sig_restart");
5848 cancel
= get_signo ("__pthread_sig_cancel");
5850 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5851 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5852 not provide any way for the debugger to query the signal numbers -
5853 fortunately they don't change! */
5856 restart
= __SIGRTMIN
;
5859 cancel
= __SIGRTMIN
+ 1;
5861 sigaddset (set
, restart
);
5862 sigaddset (set
, cancel
);
5864 /* The GNU/Linux Threads library makes terminating threads send a
5865 special "cancel" signal instead of SIGCHLD. Make sure we catch
5866 those (to prevent them from terminating GDB itself, which is
5867 likely to be their default action) and treat them the same way as
5870 action
.sa_handler
= sigchld_handler
;
5871 sigemptyset (&action
.sa_mask
);
5872 action
.sa_flags
= SA_RESTART
;
5873 sigaction (cancel
, &action
, NULL
);
5875 /* We block the "cancel" signal throughout this code ... */
5876 sigaddset (&blocked_mask
, cancel
);
5877 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5879 /* ... except during a sigsuspend. */
5880 sigdelset (&suspend_mask
, cancel
);