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-fork.h"
34 #include "gdbthread.h"
38 #include "inf-ptrace.h"
40 #include <sys/param.h> /* for MAXPATHLEN */
41 #include <sys/procfs.h> /* for elf_gregset etc. */
42 #include "elf-bfd.h" /* for elfcore_write_* */
43 #include "gregset.h" /* for gregset */
44 #include "gdbcore.h" /* for get_exec_file */
45 #include <ctype.h> /* for isdigit */
46 #include "gdbthread.h" /* for struct thread_info etc. */
47 #include "gdb_stat.h" /* for struct stat */
48 #include <fcntl.h> /* for O_RDONLY */
50 #include "event-loop.h"
51 #include "event-top.h"
53 #include <sys/types.h>
54 #include "gdb_dirent.h"
55 #include "xml-support.h"
61 #define SPUFS_MAGIC 0x23c9b64e
64 #ifdef HAVE_PERSONALITY
65 # include <sys/personality.h>
66 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
67 # define ADDR_NO_RANDOMIZE 0x0040000
69 #endif /* HAVE_PERSONALITY */
71 /* This comment documents high-level logic of this file.
73 Waiting for events in sync mode
74 ===============================
76 When waiting for an event in a specific thread, we just use waitpid, passing
77 the specific pid, and not passing WNOHANG.
79 When waiting for an event in all threads, waitpid is not quite good. Prior to
80 version 2.4, Linux can either wait for event in main thread, or in secondary
81 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
82 miss an event. The solution is to use non-blocking waitpid, together with
83 sigsuspend. First, we use non-blocking waitpid to get an event in the main
84 process, if any. Second, we use non-blocking waitpid with the __WCLONED
85 flag to check for events in cloned processes. If nothing is found, we use
86 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
87 happened to a child process -- and SIGCHLD will be delivered both for events
88 in main debugged process and in cloned processes. As soon as we know there's
89 an event, we get back to calling nonblocking waitpid with and without
92 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
93 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
94 blocked, the signal becomes pending and sigsuspend immediately
95 notices it and returns.
97 Waiting for events in async mode
98 ================================
100 In async mode, GDB should always be ready to handle both user input
101 and target events, so neither blocking waitpid nor sigsuspend are
102 viable options. Instead, we should asynchronously notify the GDB main
103 event loop whenever there's an unprocessed event from the target. We
104 detect asynchronous target events by handling SIGCHLD signals. To
105 notify the event loop about target events, the self-pipe trick is used
106 --- a pipe is registered as waitable event source in the event loop,
107 the event loop select/poll's on the read end of this pipe (as well on
108 other event sources, e.g., stdin), and the SIGCHLD handler writes a
109 byte to this pipe. This is more portable than relying on
110 pselect/ppoll, since on kernels that lack those syscalls, libc
111 emulates them with select/poll+sigprocmask, and that is racy
112 (a.k.a. plain broken).
114 Obviously, if we fail to notify the event loop if there's a target
115 event, it's bad. OTOH, if we notify the event loop when there's no
116 event from the target, linux_nat_wait will detect that there's no real
117 event to report, and return event of type TARGET_WAITKIND_IGNORE.
118 This is mostly harmless, but it will waste time and is better avoided.
120 The main design point is that every time GDB is outside linux-nat.c,
121 we have a SIGCHLD handler installed that is called when something
122 happens to the target and notifies the GDB event loop. Whenever GDB
123 core decides to handle the event, and calls into linux-nat.c, we
124 process things as in sync mode, except that the we never block in
127 While processing an event, we may end up momentarily blocked in
128 waitpid calls. Those waitpid calls, while blocking, are guarantied to
129 return quickly. E.g., in all-stop mode, before reporting to the core
130 that an LWP hit a breakpoint, all LWPs are stopped by sending them
131 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
132 Note that this is different from blocking indefinitely waiting for the
133 next event --- here, we're already handling an event.
138 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
139 signal is not entirely significant; we just need for a signal to be delivered,
140 so that we can intercept it. SIGSTOP's advantage is that it can not be
141 blocked. A disadvantage is that it is not a real-time signal, so it can only
142 be queued once; we do not keep track of other sources of SIGSTOP.
144 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
145 use them, because they have special behavior when the signal is generated -
146 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
147 kills the entire thread group.
149 A delivered SIGSTOP would stop the entire thread group, not just the thread we
150 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
151 cancel it (by PTRACE_CONT without passing SIGSTOP).
153 We could use a real-time signal instead. This would solve those problems; we
154 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
155 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
156 generates it, and there are races with trying to find a signal that is not
160 #define O_LARGEFILE 0
163 /* If the system headers did not provide the constants, hard-code the normal
165 #ifndef PTRACE_EVENT_FORK
167 #define PTRACE_SETOPTIONS 0x4200
168 #define PTRACE_GETEVENTMSG 0x4201
170 /* options set using PTRACE_SETOPTIONS */
171 #define PTRACE_O_TRACESYSGOOD 0x00000001
172 #define PTRACE_O_TRACEFORK 0x00000002
173 #define PTRACE_O_TRACEVFORK 0x00000004
174 #define PTRACE_O_TRACECLONE 0x00000008
175 #define PTRACE_O_TRACEEXEC 0x00000010
176 #define PTRACE_O_TRACEVFORKDONE 0x00000020
177 #define PTRACE_O_TRACEEXIT 0x00000040
179 /* Wait extended result codes for the above trace options. */
180 #define PTRACE_EVENT_FORK 1
181 #define PTRACE_EVENT_VFORK 2
182 #define PTRACE_EVENT_CLONE 3
183 #define PTRACE_EVENT_EXEC 4
184 #define PTRACE_EVENT_VFORK_DONE 5
185 #define PTRACE_EVENT_EXIT 6
187 #endif /* PTRACE_EVENT_FORK */
189 /* Unlike other extended result codes, WSTOPSIG (status) on
190 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
191 instead SIGTRAP with bit 7 set. */
192 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
194 /* We can't always assume that this flag is available, but all systems
195 with the ptrace event handlers also have __WALL, so it's safe to use
198 #define __WALL 0x40000000 /* Wait for any child. */
201 #ifndef PTRACE_GETSIGINFO
202 # define PTRACE_GETSIGINFO 0x4202
203 # define PTRACE_SETSIGINFO 0x4203
206 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
207 the use of the multi-threaded target. */
208 static struct target_ops
*linux_ops
;
209 static struct target_ops linux_ops_saved
;
211 /* The method to call, if any, when a new thread is attached. */
212 static void (*linux_nat_new_thread
) (ptid_t
);
214 /* The method to call, if any, when the siginfo object needs to be
215 converted between the layout returned by ptrace, and the layout in
216 the architecture of the inferior. */
217 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
221 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
222 Called by our to_xfer_partial. */
223 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
225 const char *, gdb_byte
*,
229 static int debug_linux_nat
;
231 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
232 struct cmd_list_element
*c
, const char *value
)
234 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
238 static int debug_linux_nat_async
= 0;
240 show_debug_linux_nat_async (struct ui_file
*file
, int from_tty
,
241 struct cmd_list_element
*c
, const char *value
)
243 fprintf_filtered (file
,
244 _("Debugging of GNU/Linux async lwp module is %s.\n"),
248 static int disable_randomization
= 1;
251 show_disable_randomization (struct ui_file
*file
, int from_tty
,
252 struct cmd_list_element
*c
, const char *value
)
254 #ifdef HAVE_PERSONALITY
255 fprintf_filtered (file
,
256 _("Disabling randomization of debuggee's "
257 "virtual address space is %s.\n"),
259 #else /* !HAVE_PERSONALITY */
260 fputs_filtered (_("Disabling randomization of debuggee's "
261 "virtual address space is unsupported on\n"
262 "this platform.\n"), file
);
263 #endif /* !HAVE_PERSONALITY */
267 set_disable_randomization (char *args
, int from_tty
,
268 struct cmd_list_element
*c
)
270 #ifndef HAVE_PERSONALITY
271 error (_("Disabling randomization of debuggee's "
272 "virtual address space is unsupported on\n"
274 #endif /* !HAVE_PERSONALITY */
277 struct simple_pid_list
281 struct simple_pid_list
*next
;
283 struct simple_pid_list
*stopped_pids
;
285 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
286 can not be used, 1 if it can. */
288 static int linux_supports_tracefork_flag
= -1;
290 /* This variable is a tri-state flag: -1 for unknown, 0 if
291 PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */
293 static int linux_supports_tracesysgood_flag
= -1;
295 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
296 PTRACE_O_TRACEVFORKDONE. */
298 static int linux_supports_tracevforkdone_flag
= -1;
300 /* Async mode support */
302 /* Zero if the async mode, although enabled, is masked, which means
303 linux_nat_wait should behave as if async mode was off. */
304 static int linux_nat_async_mask_value
= 1;
306 /* Stores the current used ptrace() options. */
307 static int current_ptrace_options
= 0;
309 /* The read/write ends of the pipe registered as waitable file in the
311 static int linux_nat_event_pipe
[2] = { -1, -1 };
313 /* Flush the event pipe. */
316 async_file_flush (void)
323 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
325 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
328 /* Put something (anything, doesn't matter what, or how much) in event
329 pipe, so that the select/poll in the event-loop realizes we have
330 something to process. */
333 async_file_mark (void)
337 /* It doesn't really matter what the pipe contains, as long we end
338 up with something in it. Might as well flush the previous
344 ret
= write (linux_nat_event_pipe
[1], "+", 1);
346 while (ret
== -1 && errno
== EINTR
);
348 /* Ignore EAGAIN. If the pipe is full, the event loop will already
349 be awakened anyway. */
352 static void linux_nat_async (void (*callback
)
353 (enum inferior_event_type event_type
,
356 static int linux_nat_async_mask (int mask
);
357 static int kill_lwp (int lwpid
, int signo
);
359 static int stop_callback (struct lwp_info
*lp
, void *data
);
361 static void block_child_signals (sigset_t
*prev_mask
);
362 static void restore_child_signals_mask (sigset_t
*prev_mask
);
365 static struct lwp_info
*add_lwp (ptid_t ptid
);
366 static void purge_lwp_list (int pid
);
367 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
370 /* Trivial list manipulation functions to keep track of a list of
371 new stopped processes. */
373 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
375 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
378 new_pid
->status
= status
;
379 new_pid
->next
= *listp
;
384 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
386 struct simple_pid_list
**p
;
388 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
389 if ((*p
)->pid
== pid
)
391 struct simple_pid_list
*next
= (*p
)->next
;
393 *statusp
= (*p
)->status
;
402 linux_record_stopped_pid (int pid
, int status
)
404 add_to_pid_list (&stopped_pids
, pid
, status
);
408 /* A helper function for linux_test_for_tracefork, called after fork (). */
411 linux_tracefork_child (void)
413 ptrace (PTRACE_TRACEME
, 0, 0, 0);
414 kill (getpid (), SIGSTOP
);
419 /* Wrapper function for waitpid which handles EINTR. */
422 my_waitpid (int pid
, int *statusp
, int flags
)
428 ret
= waitpid (pid
, statusp
, flags
);
430 while (ret
== -1 && errno
== EINTR
);
435 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
437 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
438 we know that the feature is not available. This may change the tracing
439 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
441 However, if it succeeds, we don't know for sure that the feature is
442 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
443 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
444 fork tracing, and let it fork. If the process exits, we assume that we
445 can't use TRACEFORK; if we get the fork notification, and we can extract
446 the new child's PID, then we assume that we can. */
449 linux_test_for_tracefork (int original_pid
)
451 int child_pid
, ret
, status
;
455 /* We don't want those ptrace calls to be interrupted. */
456 block_child_signals (&prev_mask
);
458 linux_supports_tracefork_flag
= 0;
459 linux_supports_tracevforkdone_flag
= 0;
461 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
464 restore_child_signals_mask (&prev_mask
);
470 perror_with_name (("fork"));
473 linux_tracefork_child ();
475 ret
= my_waitpid (child_pid
, &status
, 0);
477 perror_with_name (("waitpid"));
478 else if (ret
!= child_pid
)
479 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
480 if (! WIFSTOPPED (status
))
481 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."),
484 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
487 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
490 warning (_("linux_test_for_tracefork: failed to kill child"));
491 restore_child_signals_mask (&prev_mask
);
495 ret
= my_waitpid (child_pid
, &status
, 0);
496 if (ret
!= child_pid
)
497 warning (_("linux_test_for_tracefork: failed "
498 "to wait for killed child"));
499 else if (!WIFSIGNALED (status
))
500 warning (_("linux_test_for_tracefork: unexpected "
501 "wait status 0x%x from killed child"), status
);
503 restore_child_signals_mask (&prev_mask
);
507 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
508 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
509 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
510 linux_supports_tracevforkdone_flag
= (ret
== 0);
512 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
514 warning (_("linux_test_for_tracefork: failed to resume child"));
516 ret
= my_waitpid (child_pid
, &status
, 0);
518 if (ret
== child_pid
&& WIFSTOPPED (status
)
519 && status
>> 16 == PTRACE_EVENT_FORK
)
522 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
523 if (ret
== 0 && second_pid
!= 0)
527 linux_supports_tracefork_flag
= 1;
528 my_waitpid (second_pid
, &second_status
, 0);
529 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
531 warning (_("linux_test_for_tracefork: "
532 "failed to kill second child"));
533 my_waitpid (second_pid
, &status
, 0);
537 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
538 "(%d, status 0x%x)"), ret
, status
);
540 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
542 warning (_("linux_test_for_tracefork: failed to kill child"));
543 my_waitpid (child_pid
, &status
, 0);
545 restore_child_signals_mask (&prev_mask
);
548 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
550 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
551 we know that the feature is not available. This may change the tracing
552 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
555 linux_test_for_tracesysgood (int original_pid
)
560 /* We don't want those ptrace calls to be interrupted. */
561 block_child_signals (&prev_mask
);
563 linux_supports_tracesysgood_flag
= 0;
565 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
569 linux_supports_tracesysgood_flag
= 1;
571 restore_child_signals_mask (&prev_mask
);
574 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
575 This function also sets linux_supports_tracesysgood_flag. */
578 linux_supports_tracesysgood (int pid
)
580 if (linux_supports_tracesysgood_flag
== -1)
581 linux_test_for_tracesysgood (pid
);
582 return linux_supports_tracesysgood_flag
;
585 /* Return non-zero iff we have tracefork functionality available.
586 This function also sets linux_supports_tracefork_flag. */
589 linux_supports_tracefork (int pid
)
591 if (linux_supports_tracefork_flag
== -1)
592 linux_test_for_tracefork (pid
);
593 return linux_supports_tracefork_flag
;
597 linux_supports_tracevforkdone (int pid
)
599 if (linux_supports_tracefork_flag
== -1)
600 linux_test_for_tracefork (pid
);
601 return linux_supports_tracevforkdone_flag
;
605 linux_enable_tracesysgood (ptid_t ptid
)
607 int pid
= ptid_get_lwp (ptid
);
610 pid
= ptid_get_pid (ptid
);
612 if (linux_supports_tracesysgood (pid
) == 0)
615 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
617 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
622 linux_enable_event_reporting (ptid_t ptid
)
624 int pid
= ptid_get_lwp (ptid
);
627 pid
= ptid_get_pid (ptid
);
629 if (! linux_supports_tracefork (pid
))
632 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
633 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
635 if (linux_supports_tracevforkdone (pid
))
636 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
638 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
639 read-only process state. */
641 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
645 linux_child_post_attach (int pid
)
647 linux_enable_event_reporting (pid_to_ptid (pid
));
648 check_for_thread_db ();
649 linux_enable_tracesysgood (pid_to_ptid (pid
));
653 linux_child_post_startup_inferior (ptid_t ptid
)
655 linux_enable_event_reporting (ptid
);
656 check_for_thread_db ();
657 linux_enable_tracesysgood (ptid
);
661 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
665 int parent_pid
, child_pid
;
667 block_child_signals (&prev_mask
);
669 has_vforked
= (inferior_thread ()->pending_follow
.kind
670 == TARGET_WAITKIND_VFORKED
);
671 parent_pid
= ptid_get_lwp (inferior_ptid
);
673 parent_pid
= ptid_get_pid (inferior_ptid
);
674 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
677 linux_enable_event_reporting (pid_to_ptid (child_pid
));
680 && !non_stop
/* Non-stop always resumes both branches. */
681 && (!target_is_async_p () || sync_execution
)
682 && !(follow_child
|| detach_fork
|| sched_multi
))
684 /* The parent stays blocked inside the vfork syscall until the
685 child execs or exits. If we don't let the child run, then
686 the parent stays blocked. If we're telling the parent to run
687 in the foreground, the user will not be able to ctrl-c to get
688 back the terminal, effectively hanging the debug session. */
689 fprintf_filtered (gdb_stderr
,
690 _("Can not resume the parent process "
691 "over vfork in the foreground while\n"
692 "holding the child stopped. "
693 "Try \"set detach-on-fork\" or "
694 "\"set schedule-multiple\".\n"));
700 struct lwp_info
*child_lp
= NULL
;
702 /* We're already attached to the parent, by default. */
704 /* Detach new forked process? */
707 /* Before detaching from the child, remove all breakpoints
708 from it. If we forked, then this has already been taken
709 care of by infrun.c. If we vforked however, any
710 breakpoint inserted in the parent is visible in the
711 child, even those added while stopped in a vfork
712 catchpoint. This will remove the breakpoints from the
713 parent also, but they'll be reinserted below. */
716 /* keep breakpoints list in sync. */
717 remove_breakpoints_pid (GET_PID (inferior_ptid
));
720 if (info_verbose
|| debug_linux_nat
)
722 target_terminal_ours ();
723 fprintf_filtered (gdb_stdlog
,
724 "Detaching after fork from "
725 "child process %d.\n",
729 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
733 struct inferior
*parent_inf
, *child_inf
;
734 struct cleanup
*old_chain
;
736 /* Add process to GDB's tables. */
737 child_inf
= add_inferior (child_pid
);
739 parent_inf
= current_inferior ();
740 child_inf
->attach_flag
= parent_inf
->attach_flag
;
741 copy_terminal_info (child_inf
, parent_inf
);
743 old_chain
= save_inferior_ptid ();
744 save_current_program_space ();
746 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
747 add_thread (inferior_ptid
);
748 child_lp
= add_lwp (inferior_ptid
);
749 child_lp
->stopped
= 1;
750 child_lp
->resumed
= 1;
752 /* If this is a vfork child, then the address-space is
753 shared with the parent. */
756 child_inf
->pspace
= parent_inf
->pspace
;
757 child_inf
->aspace
= parent_inf
->aspace
;
759 /* The parent will be frozen until the child is done
760 with the shared region. Keep track of the
762 child_inf
->vfork_parent
= parent_inf
;
763 child_inf
->pending_detach
= 0;
764 parent_inf
->vfork_child
= child_inf
;
765 parent_inf
->pending_detach
= 0;
769 child_inf
->aspace
= new_address_space ();
770 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
771 child_inf
->removable
= 1;
772 set_current_program_space (child_inf
->pspace
);
773 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
775 /* Let the shared library layer (solib-svr4) learn about
776 this new process, relocate the cloned exec, pull in
777 shared libraries, and install the solib event
778 breakpoint. If a "cloned-VM" event was propagated
779 better throughout the core, this wouldn't be
781 solib_create_inferior_hook (0);
784 /* Let the thread_db layer learn about this new process. */
785 check_for_thread_db ();
787 do_cleanups (old_chain
);
793 struct inferior
*parent_inf
;
795 parent_inf
= current_inferior ();
797 /* If we detached from the child, then we have to be careful
798 to not insert breakpoints in the parent until the child
799 is done with the shared memory region. However, if we're
800 staying attached to the child, then we can and should
801 insert breakpoints, so that we can debug it. A
802 subsequent child exec or exit is enough to know when does
803 the child stops using the parent's address space. */
804 parent_inf
->waiting_for_vfork_done
= detach_fork
;
805 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
807 lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
808 gdb_assert (linux_supports_tracefork_flag
>= 0);
809 if (linux_supports_tracevforkdone (0))
812 fprintf_unfiltered (gdb_stdlog
,
813 "LCFF: waiting for VFORK_DONE on %d\n",
819 /* We'll handle the VFORK_DONE event like any other
820 event, in target_wait. */
824 /* We can't insert breakpoints until the child has
825 finished with the shared memory region. We need to
826 wait until that happens. Ideal would be to just
828 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
829 - waitpid (parent_pid, &status, __WALL);
830 However, most architectures can't handle a syscall
831 being traced on the way out if it wasn't traced on
834 We might also think to loop, continuing the child
835 until it exits or gets a SIGTRAP. One problem is
836 that the child might call ptrace with PTRACE_TRACEME.
838 There's no simple and reliable way to figure out when
839 the vforked child will be done with its copy of the
840 shared memory. We could step it out of the syscall,
841 two instructions, let it go, and then single-step the
842 parent once. When we have hardware single-step, this
843 would work; with software single-step it could still
844 be made to work but we'd have to be able to insert
845 single-step breakpoints in the child, and we'd have
846 to insert -just- the single-step breakpoint in the
847 parent. Very awkward.
849 In the end, the best we can do is to make sure it
850 runs for a little while. Hopefully it will be out of
851 range of any breakpoints we reinsert. Usually this
852 is only the single-step breakpoint at vfork's return
856 fprintf_unfiltered (gdb_stdlog
,
857 "LCFF: no VFORK_DONE "
858 "support, sleeping a bit\n");
862 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
863 and leave it pending. The next linux_nat_resume call
864 will notice a pending event, and bypasses actually
865 resuming the inferior. */
867 lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
871 /* If we're in async mode, need to tell the event loop
872 there's something here to process. */
873 if (target_can_async_p ())
880 struct inferior
*parent_inf
, *child_inf
;
882 struct program_space
*parent_pspace
;
884 if (info_verbose
|| debug_linux_nat
)
886 target_terminal_ours ();
888 fprintf_filtered (gdb_stdlog
,
889 _("Attaching after process %d "
890 "vfork to child process %d.\n"),
891 parent_pid
, child_pid
);
893 fprintf_filtered (gdb_stdlog
,
894 _("Attaching after process %d "
895 "fork to child process %d.\n"),
896 parent_pid
, child_pid
);
899 /* Add the new inferior first, so that the target_detach below
900 doesn't unpush the target. */
902 child_inf
= add_inferior (child_pid
);
904 parent_inf
= current_inferior ();
905 child_inf
->attach_flag
= parent_inf
->attach_flag
;
906 copy_terminal_info (child_inf
, parent_inf
);
908 parent_pspace
= parent_inf
->pspace
;
910 /* If we're vforking, we want to hold on to the parent until the
911 child exits or execs. At child exec or exit time we can
912 remove the old breakpoints from the parent and detach or
913 resume debugging it. Otherwise, detach the parent now; we'll
914 want to reuse it's program/address spaces, but we can't set
915 them to the child before removing breakpoints from the
916 parent, otherwise, the breakpoints module could decide to
917 remove breakpoints from the wrong process (since they'd be
918 assigned to the same address space). */
922 gdb_assert (child_inf
->vfork_parent
== NULL
);
923 gdb_assert (parent_inf
->vfork_child
== NULL
);
924 child_inf
->vfork_parent
= parent_inf
;
925 child_inf
->pending_detach
= 0;
926 parent_inf
->vfork_child
= child_inf
;
927 parent_inf
->pending_detach
= detach_fork
;
928 parent_inf
->waiting_for_vfork_done
= 0;
930 else if (detach_fork
)
931 target_detach (NULL
, 0);
933 /* Note that the detach above makes PARENT_INF dangling. */
935 /* Add the child thread to the appropriate lists, and switch to
936 this new thread, before cloning the program space, and
937 informing the solib layer about this new process. */
939 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
940 add_thread (inferior_ptid
);
941 lp
= add_lwp (inferior_ptid
);
945 /* If this is a vfork child, then the address-space is shared
946 with the parent. If we detached from the parent, then we can
947 reuse the parent's program/address spaces. */
948 if (has_vforked
|| detach_fork
)
950 child_inf
->pspace
= parent_pspace
;
951 child_inf
->aspace
= child_inf
->pspace
->aspace
;
955 child_inf
->aspace
= new_address_space ();
956 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
957 child_inf
->removable
= 1;
958 set_current_program_space (child_inf
->pspace
);
959 clone_program_space (child_inf
->pspace
, parent_pspace
);
961 /* Let the shared library layer (solib-svr4) learn about
962 this new process, relocate the cloned exec, pull in
963 shared libraries, and install the solib event breakpoint.
964 If a "cloned-VM" event was propagated better throughout
965 the core, this wouldn't be required. */
966 solib_create_inferior_hook (0);
969 /* Let the thread_db layer learn about this new process. */
970 check_for_thread_db ();
973 restore_child_signals_mask (&prev_mask
);
979 linux_child_insert_fork_catchpoint (int pid
)
981 if (! linux_supports_tracefork (pid
))
982 error (_("Your system does not support fork catchpoints."));
986 linux_child_insert_vfork_catchpoint (int pid
)
988 if (!linux_supports_tracefork (pid
))
989 error (_("Your system does not support vfork catchpoints."));
993 linux_child_insert_exec_catchpoint (int pid
)
995 if (!linux_supports_tracefork (pid
))
996 error (_("Your system does not support exec catchpoints."));
1000 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
1001 int table_size
, int *table
)
1003 if (! linux_supports_tracesysgood (pid
))
1004 error (_("Your system does not support syscall catchpoints."));
1005 /* On GNU/Linux, we ignore the arguments. It means that we only
1006 enable the syscall catchpoints, but do not disable them.
1008 Also, we do not use the `table' information because we do not
1009 filter system calls here. We let GDB do the logic for us. */
1013 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
1014 are processes sharing the same VM space. A multi-threaded process
1015 is basically a group of such processes. However, such a grouping
1016 is almost entirely a user-space issue; the kernel doesn't enforce
1017 such a grouping at all (this might change in the future). In
1018 general, we'll rely on the threads library (i.e. the GNU/Linux
1019 Threads library) to provide such a grouping.
1021 It is perfectly well possible to write a multi-threaded application
1022 without the assistance of a threads library, by using the clone
1023 system call directly. This module should be able to give some
1024 rudimentary support for debugging such applications if developers
1025 specify the CLONE_PTRACE flag in the clone system call, and are
1026 using the Linux kernel 2.4 or above.
1028 Note that there are some peculiarities in GNU/Linux that affect
1031 - In general one should specify the __WCLONE flag to waitpid in
1032 order to make it report events for any of the cloned processes
1033 (and leave it out for the initial process). However, if a cloned
1034 process has exited the exit status is only reported if the
1035 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
1036 we cannot use it since GDB must work on older systems too.
1038 - When a traced, cloned process exits and is waited for by the
1039 debugger, the kernel reassigns it to the original parent and
1040 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1041 library doesn't notice this, which leads to the "zombie problem":
1042 When debugged a multi-threaded process that spawns a lot of
1043 threads will run out of processes, even if the threads exit,
1044 because the "zombies" stay around. */
1046 /* List of known LWPs. */
1047 struct lwp_info
*lwp_list
;
1050 /* Original signal mask. */
1051 static sigset_t normal_mask
;
1053 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1054 _initialize_linux_nat. */
1055 static sigset_t suspend_mask
;
1057 /* Signals to block to make that sigsuspend work. */
1058 static sigset_t blocked_mask
;
1060 /* SIGCHLD action. */
1061 struct sigaction sigchld_action
;
1063 /* Block child signals (SIGCHLD and linux threads signals), and store
1064 the previous mask in PREV_MASK. */
1067 block_child_signals (sigset_t
*prev_mask
)
1069 /* Make sure SIGCHLD is blocked. */
1070 if (!sigismember (&blocked_mask
, SIGCHLD
))
1071 sigaddset (&blocked_mask
, SIGCHLD
);
1073 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1076 /* Restore child signals mask, previously returned by
1077 block_child_signals. */
1080 restore_child_signals_mask (sigset_t
*prev_mask
)
1082 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1086 /* Prototypes for local functions. */
1087 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1088 static int linux_thread_alive (ptid_t ptid
);
1089 static char *linux_child_pid_to_exec_file (int pid
);
1092 /* Convert wait status STATUS to a string. Used for printing debug
1096 status_to_str (int status
)
1098 static char buf
[64];
1100 if (WIFSTOPPED (status
))
1102 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1103 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1104 strsignal (SIGTRAP
));
1106 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1107 strsignal (WSTOPSIG (status
)));
1109 else if (WIFSIGNALED (status
))
1110 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1111 strsignal (WTERMSIG (status
)));
1113 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1118 /* Remove all LWPs belong to PID from the lwp list. */
1121 purge_lwp_list (int pid
)
1123 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1127 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1131 if (ptid_get_pid (lp
->ptid
) == pid
)
1134 lwp_list
= lp
->next
;
1136 lpprev
->next
= lp
->next
;
1145 /* Return the number of known LWPs in the tgid given by PID. */
1151 struct lwp_info
*lp
;
1153 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1154 if (ptid_get_pid (lp
->ptid
) == pid
)
1160 /* Add the LWP specified by PID to the list. Return a pointer to the
1161 structure describing the new LWP. The LWP should already be stopped
1162 (with an exception for the very first LWP). */
1164 static struct lwp_info
*
1165 add_lwp (ptid_t ptid
)
1167 struct lwp_info
*lp
;
1169 gdb_assert (is_lwp (ptid
));
1171 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1173 memset (lp
, 0, sizeof (struct lwp_info
));
1175 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1180 lp
->next
= lwp_list
;
1183 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1184 linux_nat_new_thread (ptid
);
1189 /* Remove the LWP specified by PID from the list. */
1192 delete_lwp (ptid_t ptid
)
1194 struct lwp_info
*lp
, *lpprev
;
1198 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1199 if (ptid_equal (lp
->ptid
, ptid
))
1206 lpprev
->next
= lp
->next
;
1208 lwp_list
= lp
->next
;
1213 /* Return a pointer to the structure describing the LWP corresponding
1214 to PID. If no corresponding LWP could be found, return NULL. */
1216 static struct lwp_info
*
1217 find_lwp_pid (ptid_t ptid
)
1219 struct lwp_info
*lp
;
1223 lwp
= GET_LWP (ptid
);
1225 lwp
= GET_PID (ptid
);
1227 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1228 if (lwp
== GET_LWP (lp
->ptid
))
1234 /* Call CALLBACK with its second argument set to DATA for every LWP in
1235 the list. If CALLBACK returns 1 for a particular LWP, return a
1236 pointer to the structure describing that LWP immediately.
1237 Otherwise return NULL. */
1240 iterate_over_lwps (ptid_t filter
,
1241 int (*callback
) (struct lwp_info
*, void *),
1244 struct lwp_info
*lp
, *lpnext
;
1246 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1250 if (ptid_match (lp
->ptid
, filter
))
1252 if ((*callback
) (lp
, data
))
1260 /* Update our internal state when changing from one checkpoint to
1261 another indicated by NEW_PTID. We can only switch single-threaded
1262 applications, so we only create one new LWP, and the previous list
1266 linux_nat_switch_fork (ptid_t new_ptid
)
1268 struct lwp_info
*lp
;
1270 purge_lwp_list (GET_PID (inferior_ptid
));
1272 lp
= add_lwp (new_ptid
);
1275 /* This changes the thread's ptid while preserving the gdb thread
1276 num. Also changes the inferior pid, while preserving the
1278 thread_change_ptid (inferior_ptid
, new_ptid
);
1280 /* We've just told GDB core that the thread changed target id, but,
1281 in fact, it really is a different thread, with different register
1283 registers_changed ();
1286 /* Handle the exit of a single thread LP. */
1289 exit_lwp (struct lwp_info
*lp
)
1291 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1295 if (print_thread_events
)
1296 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1298 delete_thread (lp
->ptid
);
1301 delete_lwp (lp
->ptid
);
1304 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1307 linux_proc_get_tgid (int lwpid
)
1313 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1314 status_file
= fopen (buf
, "r");
1315 if (status_file
!= NULL
)
1317 while (fgets (buf
, sizeof (buf
), status_file
))
1319 if (strncmp (buf
, "Tgid:", 5) == 0)
1321 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1326 fclose (status_file
);
1332 /* Detect `T (stopped)' in `/proc/PID/status'.
1333 Other states including `T (tracing stop)' are reported as false. */
1336 pid_is_stopped (pid_t pid
)
1342 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1343 status_file
= fopen (buf
, "r");
1344 if (status_file
!= NULL
)
1348 while (fgets (buf
, sizeof (buf
), status_file
))
1350 if (strncmp (buf
, "State:", 6) == 0)
1356 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1358 fclose (status_file
);
1363 /* Wait for the LWP specified by LP, which we have just attached to.
1364 Returns a wait status for that LWP, to cache. */
1367 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1370 pid_t new_pid
, pid
= GET_LWP (ptid
);
1373 if (pid_is_stopped (pid
))
1375 if (debug_linux_nat
)
1376 fprintf_unfiltered (gdb_stdlog
,
1377 "LNPAW: Attaching to a stopped process\n");
1379 /* The process is definitely stopped. It is in a job control
1380 stop, unless the kernel predates the TASK_STOPPED /
1381 TASK_TRACED distinction, in which case it might be in a
1382 ptrace stop. Make sure it is in a ptrace stop; from there we
1383 can kill it, signal it, et cetera.
1385 First make sure there is a pending SIGSTOP. Since we are
1386 already attached, the process can not transition from stopped
1387 to running without a PTRACE_CONT; so we know this signal will
1388 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1389 probably already in the queue (unless this kernel is old
1390 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1391 is not an RT signal, it can only be queued once. */
1392 kill_lwp (pid
, SIGSTOP
);
1394 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1395 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1396 ptrace (PTRACE_CONT
, pid
, 0, 0);
1399 /* Make sure the initial process is stopped. The user-level threads
1400 layer might want to poke around in the inferior, and that won't
1401 work if things haven't stabilized yet. */
1402 new_pid
= my_waitpid (pid
, &status
, 0);
1403 if (new_pid
== -1 && errno
== ECHILD
)
1406 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1408 /* Try again with __WCLONE to check cloned processes. */
1409 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1413 gdb_assert (pid
== new_pid
);
1415 if (!WIFSTOPPED (status
))
1417 /* The pid we tried to attach has apparently just exited. */
1418 if (debug_linux_nat
)
1419 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1420 pid
, status_to_str (status
));
1424 if (WSTOPSIG (status
) != SIGSTOP
)
1427 if (debug_linux_nat
)
1428 fprintf_unfiltered (gdb_stdlog
,
1429 "LNPAW: Received %s after attaching\n",
1430 status_to_str (status
));
1436 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1437 if the new LWP could not be attached. */
1440 lin_lwp_attach_lwp (ptid_t ptid
)
1442 struct lwp_info
*lp
;
1445 gdb_assert (is_lwp (ptid
));
1447 block_child_signals (&prev_mask
);
1449 lp
= find_lwp_pid (ptid
);
1451 /* We assume that we're already attached to any LWP that has an id
1452 equal to the overall process id, and to any LWP that is already
1453 in our list of LWPs. If we're not seeing exit events from threads
1454 and we've had PID wraparound since we last tried to stop all threads,
1455 this assumption might be wrong; fortunately, this is very unlikely
1457 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1459 int status
, cloned
= 0, signalled
= 0;
1461 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1463 /* If we fail to attach to the thread, issue a warning,
1464 but continue. One way this can happen is if thread
1465 creation is interrupted; as of Linux kernel 2.6.19, a
1466 bug may place threads in the thread list and then fail
1468 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1469 safe_strerror (errno
));
1470 restore_child_signals_mask (&prev_mask
);
1474 if (debug_linux_nat
)
1475 fprintf_unfiltered (gdb_stdlog
,
1476 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1477 target_pid_to_str (ptid
));
1479 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1480 if (!WIFSTOPPED (status
))
1483 lp
= add_lwp (ptid
);
1485 lp
->cloned
= cloned
;
1486 lp
->signalled
= signalled
;
1487 if (WSTOPSIG (status
) != SIGSTOP
)
1490 lp
->status
= status
;
1493 target_post_attach (GET_LWP (lp
->ptid
));
1495 if (debug_linux_nat
)
1497 fprintf_unfiltered (gdb_stdlog
,
1498 "LLAL: waitpid %s received %s\n",
1499 target_pid_to_str (ptid
),
1500 status_to_str (status
));
1505 /* We assume that the LWP representing the original process is
1506 already stopped. Mark it as stopped in the data structure
1507 that the GNU/linux ptrace layer uses to keep track of
1508 threads. Note that this won't have already been done since
1509 the main thread will have, we assume, been stopped by an
1510 attach from a different layer. */
1512 lp
= add_lwp (ptid
);
1516 restore_child_signals_mask (&prev_mask
);
1521 linux_nat_create_inferior (struct target_ops
*ops
,
1522 char *exec_file
, char *allargs
, char **env
,
1525 #ifdef HAVE_PERSONALITY
1526 int personality_orig
= 0, personality_set
= 0;
1527 #endif /* HAVE_PERSONALITY */
1529 /* The fork_child mechanism is synchronous and calls target_wait, so
1530 we have to mask the async mode. */
1532 #ifdef HAVE_PERSONALITY
1533 if (disable_randomization
)
1536 personality_orig
= personality (0xffffffff);
1537 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1539 personality_set
= 1;
1540 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1542 if (errno
!= 0 || (personality_set
1543 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1544 warning (_("Error disabling address space randomization: %s"),
1545 safe_strerror (errno
));
1547 #endif /* HAVE_PERSONALITY */
1549 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1551 #ifdef HAVE_PERSONALITY
1552 if (personality_set
)
1555 personality (personality_orig
);
1557 warning (_("Error restoring address space randomization: %s"),
1558 safe_strerror (errno
));
1560 #endif /* HAVE_PERSONALITY */
1564 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1566 struct lwp_info
*lp
;
1570 linux_ops
->to_attach (ops
, args
, from_tty
);
1572 /* The ptrace base target adds the main thread with (pid,0,0)
1573 format. Decorate it with lwp info. */
1574 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1575 thread_change_ptid (inferior_ptid
, ptid
);
1577 /* Add the initial process as the first LWP to the list. */
1578 lp
= add_lwp (ptid
);
1580 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1582 if (!WIFSTOPPED (status
))
1584 if (WIFEXITED (status
))
1586 int exit_code
= WEXITSTATUS (status
);
1588 target_terminal_ours ();
1589 target_mourn_inferior ();
1591 error (_("Unable to attach: program exited normally."));
1593 error (_("Unable to attach: program exited with code %d."),
1596 else if (WIFSIGNALED (status
))
1598 enum target_signal signo
;
1600 target_terminal_ours ();
1601 target_mourn_inferior ();
1603 signo
= target_signal_from_host (WTERMSIG (status
));
1604 error (_("Unable to attach: program terminated with signal "
1606 target_signal_to_name (signo
),
1607 target_signal_to_string (signo
));
1610 internal_error (__FILE__
, __LINE__
,
1611 _("unexpected status %d for PID %ld"),
1612 status
, (long) GET_LWP (ptid
));
1617 /* Save the wait status to report later. */
1619 if (debug_linux_nat
)
1620 fprintf_unfiltered (gdb_stdlog
,
1621 "LNA: waitpid %ld, saving status %s\n",
1622 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1624 lp
->status
= status
;
1626 if (target_can_async_p ())
1627 target_async (inferior_event_handler
, 0);
1630 /* Get pending status of LP. */
1632 get_pending_status (struct lwp_info
*lp
, int *status
)
1634 enum target_signal signo
= TARGET_SIGNAL_0
;
1636 /* If we paused threads momentarily, we may have stored pending
1637 events in lp->status or lp->waitstatus (see stop_wait_callback),
1638 and GDB core hasn't seen any signal for those threads.
1639 Otherwise, the last signal reported to the core is found in the
1640 thread object's stop_signal.
1642 There's a corner case that isn't handled here at present. Only
1643 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1644 stop_signal make sense as a real signal to pass to the inferior.
1645 Some catchpoint related events, like
1646 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1647 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1648 those traps are debug API (ptrace in our case) related and
1649 induced; the inferior wouldn't see them if it wasn't being
1650 traced. Hence, we should never pass them to the inferior, even
1651 when set to pass state. Since this corner case isn't handled by
1652 infrun.c when proceeding with a signal, for consistency, neither
1653 do we handle it here (or elsewhere in the file we check for
1654 signal pass state). Normally SIGTRAP isn't set to pass state, so
1655 this is really a corner case. */
1657 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1658 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1659 else if (lp
->status
)
1660 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1661 else if (non_stop
&& !is_executing (lp
->ptid
))
1663 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1665 signo
= tp
->suspend
.stop_signal
;
1669 struct target_waitstatus last
;
1672 get_last_target_status (&last_ptid
, &last
);
1674 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1676 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1678 signo
= tp
->suspend
.stop_signal
;
1684 if (signo
== TARGET_SIGNAL_0
)
1686 if (debug_linux_nat
)
1687 fprintf_unfiltered (gdb_stdlog
,
1688 "GPT: lwp %s has no pending signal\n",
1689 target_pid_to_str (lp
->ptid
));
1691 else if (!signal_pass_state (signo
))
1693 if (debug_linux_nat
)
1694 fprintf_unfiltered (gdb_stdlog
,
1695 "GPT: lwp %s had signal %s, "
1696 "but it is in no pass state\n",
1697 target_pid_to_str (lp
->ptid
),
1698 target_signal_to_string (signo
));
1702 *status
= W_STOPCODE (target_signal_to_host (signo
));
1704 if (debug_linux_nat
)
1705 fprintf_unfiltered (gdb_stdlog
,
1706 "GPT: lwp %s has pending signal %s\n",
1707 target_pid_to_str (lp
->ptid
),
1708 target_signal_to_string (signo
));
1715 detach_callback (struct lwp_info
*lp
, void *data
)
1717 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1719 if (debug_linux_nat
&& lp
->status
)
1720 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1721 strsignal (WSTOPSIG (lp
->status
)),
1722 target_pid_to_str (lp
->ptid
));
1724 /* If there is a pending SIGSTOP, get rid of it. */
1727 if (debug_linux_nat
)
1728 fprintf_unfiltered (gdb_stdlog
,
1729 "DC: Sending SIGCONT to %s\n",
1730 target_pid_to_str (lp
->ptid
));
1732 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1736 /* We don't actually detach from the LWP that has an id equal to the
1737 overall process id just yet. */
1738 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1742 /* Pass on any pending signal for this LWP. */
1743 get_pending_status (lp
, &status
);
1746 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1747 WSTOPSIG (status
)) < 0)
1748 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1749 safe_strerror (errno
));
1751 if (debug_linux_nat
)
1752 fprintf_unfiltered (gdb_stdlog
,
1753 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1754 target_pid_to_str (lp
->ptid
),
1755 strsignal (WSTOPSIG (status
)));
1757 delete_lwp (lp
->ptid
);
1764 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1768 struct lwp_info
*main_lwp
;
1770 pid
= GET_PID (inferior_ptid
);
1772 if (target_can_async_p ())
1773 linux_nat_async (NULL
, 0);
1775 /* Stop all threads before detaching. ptrace requires that the
1776 thread is stopped to sucessfully detach. */
1777 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1778 /* ... and wait until all of them have reported back that
1779 they're no longer running. */
1780 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1782 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1784 /* Only the initial process should be left right now. */
1785 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1787 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1789 /* Pass on any pending signal for the last LWP. */
1790 if ((args
== NULL
|| *args
== '\0')
1791 && get_pending_status (main_lwp
, &status
) != -1
1792 && WIFSTOPPED (status
))
1794 /* Put the signal number in ARGS so that inf_ptrace_detach will
1795 pass it along with PTRACE_DETACH. */
1797 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1798 if (debug_linux_nat
)
1799 fprintf_unfiltered (gdb_stdlog
,
1800 "LND: Sending signal %s to %s\n",
1802 target_pid_to_str (main_lwp
->ptid
));
1805 delete_lwp (main_lwp
->ptid
);
1807 if (forks_exist_p ())
1809 /* Multi-fork case. The current inferior_ptid is being detached
1810 from, but there are other viable forks to debug. Detach from
1811 the current fork, and context-switch to the first
1813 linux_fork_detach (args
, from_tty
);
1815 if (non_stop
&& target_can_async_p ())
1816 target_async (inferior_event_handler
, 0);
1819 linux_ops
->to_detach (ops
, args
, from_tty
);
1825 resume_callback (struct lwp_info
*lp
, void *data
)
1827 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1829 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1831 if (debug_linux_nat
)
1832 fprintf_unfiltered (gdb_stdlog
,
1833 "RC: Not resuming %s (vfork parent)\n",
1834 target_pid_to_str (lp
->ptid
));
1836 else if (lp
->stopped
&& lp
->status
== 0)
1838 if (debug_linux_nat
)
1839 fprintf_unfiltered (gdb_stdlog
,
1840 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1841 target_pid_to_str (lp
->ptid
));
1843 linux_ops
->to_resume (linux_ops
,
1844 pid_to_ptid (GET_LWP (lp
->ptid
)),
1845 0, TARGET_SIGNAL_0
);
1846 if (debug_linux_nat
)
1847 fprintf_unfiltered (gdb_stdlog
,
1848 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1849 target_pid_to_str (lp
->ptid
));
1852 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1853 lp
->stopped_by_watchpoint
= 0;
1855 else if (lp
->stopped
&& debug_linux_nat
)
1856 fprintf_unfiltered (gdb_stdlog
,
1857 "RC: Not resuming sibling %s (has pending)\n",
1858 target_pid_to_str (lp
->ptid
));
1859 else if (debug_linux_nat
)
1860 fprintf_unfiltered (gdb_stdlog
,
1861 "RC: Not resuming sibling %s (not stopped)\n",
1862 target_pid_to_str (lp
->ptid
));
1868 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1875 resume_set_callback (struct lwp_info
*lp
, void *data
)
1882 linux_nat_resume (struct target_ops
*ops
,
1883 ptid_t ptid
, int step
, enum target_signal signo
)
1886 struct lwp_info
*lp
;
1889 if (debug_linux_nat
)
1890 fprintf_unfiltered (gdb_stdlog
,
1891 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1892 step
? "step" : "resume",
1893 target_pid_to_str (ptid
),
1894 (signo
!= TARGET_SIGNAL_0
1895 ? strsignal (target_signal_to_host (signo
)) : "0"),
1896 target_pid_to_str (inferior_ptid
));
1898 block_child_signals (&prev_mask
);
1900 /* A specific PTID means `step only this process id'. */
1901 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1902 || ptid_is_pid (ptid
));
1904 /* Mark the lwps we're resuming as resumed. */
1905 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1907 /* See if it's the current inferior that should be handled
1910 lp
= find_lwp_pid (inferior_ptid
);
1912 lp
= find_lwp_pid (ptid
);
1913 gdb_assert (lp
!= NULL
);
1915 /* Remember if we're stepping. */
1918 /* If we have a pending wait status for this thread, there is no
1919 point in resuming the process. But first make sure that
1920 linux_nat_wait won't preemptively handle the event - we
1921 should never take this short-circuit if we are going to
1922 leave LP running, since we have skipped resuming all the
1923 other threads. This bit of code needs to be synchronized
1924 with linux_nat_wait. */
1926 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1928 enum target_signal saved_signo
;
1929 struct inferior
*inf
;
1931 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
1933 saved_signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1935 /* Defer to common code if we're gaining control of the
1937 if (inf
->control
.stop_soon
== NO_STOP_QUIETLY
1938 && signal_stop_state (saved_signo
) == 0
1939 && signal_print_state (saved_signo
) == 0
1940 && signal_pass_state (saved_signo
) == 1)
1942 if (debug_linux_nat
)
1943 fprintf_unfiltered (gdb_stdlog
,
1944 "LLR: Not short circuiting for ignored "
1945 "status 0x%x\n", lp
->status
);
1947 /* FIXME: What should we do if we are supposed to continue
1948 this thread with a signal? */
1949 gdb_assert (signo
== TARGET_SIGNAL_0
);
1950 signo
= saved_signo
;
1955 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1957 /* FIXME: What should we do if we are supposed to continue
1958 this thread with a signal? */
1959 gdb_assert (signo
== TARGET_SIGNAL_0
);
1961 if (debug_linux_nat
)
1962 fprintf_unfiltered (gdb_stdlog
,
1963 "LLR: Short circuiting for status 0x%x\n",
1966 restore_child_signals_mask (&prev_mask
);
1967 if (target_can_async_p ())
1969 target_async (inferior_event_handler
, 0);
1970 /* Tell the event loop we have something to process. */
1976 /* Mark LWP as not stopped to prevent it from being continued by
1981 iterate_over_lwps (ptid
, resume_callback
, NULL
);
1983 /* Convert to something the lower layer understands. */
1984 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
1986 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
1987 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1988 lp
->stopped_by_watchpoint
= 0;
1990 if (debug_linux_nat
)
1991 fprintf_unfiltered (gdb_stdlog
,
1992 "LLR: %s %s, %s (resume event thread)\n",
1993 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
1994 target_pid_to_str (ptid
),
1995 (signo
!= TARGET_SIGNAL_0
1996 ? strsignal (target_signal_to_host (signo
)) : "0"));
1998 restore_child_signals_mask (&prev_mask
);
1999 if (target_can_async_p ())
2000 target_async (inferior_event_handler
, 0);
2003 /* Send a signal to an LWP. */
2006 kill_lwp (int lwpid
, int signo
)
2008 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2009 fails, then we are not using nptl threads and we should be using kill. */
2011 #ifdef HAVE_TKILL_SYSCALL
2013 static int tkill_failed
;
2020 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2021 if (errno
!= ENOSYS
)
2028 return kill (lwpid
, signo
);
2031 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2032 event, check if the core is interested in it: if not, ignore the
2033 event, and keep waiting; otherwise, we need to toggle the LWP's
2034 syscall entry/exit status, since the ptrace event itself doesn't
2035 indicate it, and report the trap to higher layers. */
2038 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2040 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2041 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2042 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2046 /* If we're stopping threads, there's a SIGSTOP pending, which
2047 makes it so that the LWP reports an immediate syscall return,
2048 followed by the SIGSTOP. Skip seeing that "return" using
2049 PTRACE_CONT directly, and let stop_wait_callback collect the
2050 SIGSTOP. Later when the thread is resumed, a new syscall
2051 entry event. If we didn't do this (and returned 0), we'd
2052 leave a syscall entry pending, and our caller, by using
2053 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2054 itself. Later, when the user re-resumes this LWP, we'd see
2055 another syscall entry event and we'd mistake it for a return.
2057 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2058 (leaving immediately with LWP->signalled set, without issuing
2059 a PTRACE_CONT), it would still be problematic to leave this
2060 syscall enter pending, as later when the thread is resumed,
2061 it would then see the same syscall exit mentioned above,
2062 followed by the delayed SIGSTOP, while the syscall didn't
2063 actually get to execute. It seems it would be even more
2064 confusing to the user. */
2066 if (debug_linux_nat
)
2067 fprintf_unfiltered (gdb_stdlog
,
2068 "LHST: ignoring syscall %d "
2069 "for LWP %ld (stopping threads), "
2070 "resuming with PTRACE_CONT for SIGSTOP\n",
2072 GET_LWP (lp
->ptid
));
2074 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2075 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2079 if (catch_syscall_enabled ())
2081 /* Always update the entry/return state, even if this particular
2082 syscall isn't interesting to the core now. In async mode,
2083 the user could install a new catchpoint for this syscall
2084 between syscall enter/return, and we'll need to know to
2085 report a syscall return if that happens. */
2086 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2087 ? TARGET_WAITKIND_SYSCALL_RETURN
2088 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2090 if (catching_syscall_number (syscall_number
))
2092 /* Alright, an event to report. */
2093 ourstatus
->kind
= lp
->syscall_state
;
2094 ourstatus
->value
.syscall_number
= syscall_number
;
2096 if (debug_linux_nat
)
2097 fprintf_unfiltered (gdb_stdlog
,
2098 "LHST: stopping for %s of syscall %d"
2101 == TARGET_WAITKIND_SYSCALL_ENTRY
2102 ? "entry" : "return",
2104 GET_LWP (lp
->ptid
));
2108 if (debug_linux_nat
)
2109 fprintf_unfiltered (gdb_stdlog
,
2110 "LHST: ignoring %s of syscall %d "
2112 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2113 ? "entry" : "return",
2115 GET_LWP (lp
->ptid
));
2119 /* If we had been syscall tracing, and hence used PT_SYSCALL
2120 before on this LWP, it could happen that the user removes all
2121 syscall catchpoints before we get to process this event.
2122 There are two noteworthy issues here:
2124 - When stopped at a syscall entry event, resuming with
2125 PT_STEP still resumes executing the syscall and reports a
2128 - Only PT_SYSCALL catches syscall enters. If we last
2129 single-stepped this thread, then this event can't be a
2130 syscall enter. If we last single-stepped this thread, this
2131 has to be a syscall exit.
2133 The points above mean that the next resume, be it PT_STEP or
2134 PT_CONTINUE, can not trigger a syscall trace event. */
2135 if (debug_linux_nat
)
2136 fprintf_unfiltered (gdb_stdlog
,
2137 "LHST: caught syscall event "
2138 "with no syscall catchpoints."
2139 " %d for LWP %ld, ignoring\n",
2141 GET_LWP (lp
->ptid
));
2142 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2145 /* The core isn't interested in this event. For efficiency, avoid
2146 stopping all threads only to have the core resume them all again.
2147 Since we're not stopping threads, if we're still syscall tracing
2148 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2149 subsequent syscall. Simply resume using the inf-ptrace layer,
2150 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2152 /* Note that gdbarch_get_syscall_number may access registers, hence
2154 registers_changed ();
2155 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2156 lp
->step
, TARGET_SIGNAL_0
);
2160 /* Handle a GNU/Linux extended wait response. If we see a clone
2161 event, we need to add the new LWP to our list (and not report the
2162 trap to higher layers). This function returns non-zero if the
2163 event should be ignored and we should wait again. If STOPPING is
2164 true, the new LWP remains stopped, otherwise it is continued. */
2167 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2170 int pid
= GET_LWP (lp
->ptid
);
2171 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2172 int event
= status
>> 16;
2174 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2175 || event
== PTRACE_EVENT_CLONE
)
2177 unsigned long new_pid
;
2180 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2182 /* If we haven't already seen the new PID stop, wait for it now. */
2183 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2185 /* The new child has a pending SIGSTOP. We can't affect it until it
2186 hits the SIGSTOP, but we're already attached. */
2187 ret
= my_waitpid (new_pid
, &status
,
2188 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2190 perror_with_name (_("waiting for new child"));
2191 else if (ret
!= new_pid
)
2192 internal_error (__FILE__
, __LINE__
,
2193 _("wait returned unexpected PID %d"), ret
);
2194 else if (!WIFSTOPPED (status
))
2195 internal_error (__FILE__
, __LINE__
,
2196 _("wait returned unexpected status 0x%x"), status
);
2199 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2201 if (event
== PTRACE_EVENT_FORK
2202 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2204 struct fork_info
*fp
;
2206 /* Handle checkpointing by linux-fork.c here as a special
2207 case. We don't want the follow-fork-mode or 'catch fork'
2208 to interfere with this. */
2210 /* This won't actually modify the breakpoint list, but will
2211 physically remove the breakpoints from the child. */
2212 detach_breakpoints (new_pid
);
2214 /* Retain child fork in ptrace (stopped) state. */
2215 fp
= find_fork_pid (new_pid
);
2217 fp
= add_fork (new_pid
);
2219 /* Report as spurious, so that infrun doesn't want to follow
2220 this fork. We're actually doing an infcall in
2222 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2223 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2225 /* Report the stop to the core. */
2229 if (event
== PTRACE_EVENT_FORK
)
2230 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2231 else if (event
== PTRACE_EVENT_VFORK
)
2232 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2235 struct lwp_info
*new_lp
;
2237 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2239 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2241 new_lp
->stopped
= 1;
2243 if (WSTOPSIG (status
) != SIGSTOP
)
2245 /* This can happen if someone starts sending signals to
2246 the new thread before it gets a chance to run, which
2247 have a lower number than SIGSTOP (e.g. SIGUSR1).
2248 This is an unlikely case, and harder to handle for
2249 fork / vfork than for clone, so we do not try - but
2250 we handle it for clone events here. We'll send
2251 the other signal on to the thread below. */
2253 new_lp
->signalled
= 1;
2260 /* Add the new thread to GDB's lists as soon as possible
2263 1) the frontend doesn't have to wait for a stop to
2266 2) we tag it with the correct running state. */
2268 /* If the thread_db layer is active, let it know about
2269 this new thread, and add it to GDB's list. */
2270 if (!thread_db_attach_lwp (new_lp
->ptid
))
2272 /* We're not using thread_db. Add it to GDB's
2274 target_post_attach (GET_LWP (new_lp
->ptid
));
2275 add_thread (new_lp
->ptid
);
2280 set_running (new_lp
->ptid
, 1);
2281 set_executing (new_lp
->ptid
, 1);
2285 /* Note the need to use the low target ops to resume, to
2286 handle resuming with PT_SYSCALL if we have syscall
2290 enum target_signal signo
;
2292 new_lp
->stopped
= 0;
2293 new_lp
->resumed
= 1;
2296 ? target_signal_from_host (WSTOPSIG (status
))
2299 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2306 /* We created NEW_LP so it cannot yet contain STATUS. */
2307 gdb_assert (new_lp
->status
== 0);
2309 /* Save the wait status to report later. */
2310 if (debug_linux_nat
)
2311 fprintf_unfiltered (gdb_stdlog
,
2312 "LHEW: waitpid of new LWP %ld, "
2313 "saving status %s\n",
2314 (long) GET_LWP (new_lp
->ptid
),
2315 status_to_str (status
));
2316 new_lp
->status
= status
;
2320 if (debug_linux_nat
)
2321 fprintf_unfiltered (gdb_stdlog
,
2322 "LHEW: Got clone event "
2323 "from LWP %ld, resuming\n",
2324 GET_LWP (lp
->ptid
));
2325 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2326 0, TARGET_SIGNAL_0
);
2334 if (event
== PTRACE_EVENT_EXEC
)
2336 if (debug_linux_nat
)
2337 fprintf_unfiltered (gdb_stdlog
,
2338 "LHEW: Got exec event from LWP %ld\n",
2339 GET_LWP (lp
->ptid
));
2341 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2342 ourstatus
->value
.execd_pathname
2343 = xstrdup (linux_child_pid_to_exec_file (pid
));
2348 if (event
== PTRACE_EVENT_VFORK_DONE
)
2350 if (current_inferior ()->waiting_for_vfork_done
)
2352 if (debug_linux_nat
)
2353 fprintf_unfiltered (gdb_stdlog
,
2354 "LHEW: Got expected PTRACE_EVENT_"
2355 "VFORK_DONE from LWP %ld: stopping\n",
2356 GET_LWP (lp
->ptid
));
2358 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2362 if (debug_linux_nat
)
2363 fprintf_unfiltered (gdb_stdlog
,
2364 "LHEW: Got PTRACE_EVENT_VFORK_DONE "
2365 "from LWP %ld: resuming\n",
2366 GET_LWP (lp
->ptid
));
2367 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2371 internal_error (__FILE__
, __LINE__
,
2372 _("unknown ptrace event %d"), event
);
2375 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2379 wait_lwp (struct lwp_info
*lp
)
2383 int thread_dead
= 0;
2385 gdb_assert (!lp
->stopped
);
2386 gdb_assert (lp
->status
== 0);
2388 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2389 if (pid
== -1 && errno
== ECHILD
)
2391 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2392 if (pid
== -1 && errno
== ECHILD
)
2394 /* The thread has previously exited. We need to delete it
2395 now because, for some vendor 2.4 kernels with NPTL
2396 support backported, there won't be an exit event unless
2397 it is the main thread. 2.6 kernels will report an exit
2398 event for each thread that exits, as expected. */
2400 if (debug_linux_nat
)
2401 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2402 target_pid_to_str (lp
->ptid
));
2408 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2410 if (debug_linux_nat
)
2412 fprintf_unfiltered (gdb_stdlog
,
2413 "WL: waitpid %s received %s\n",
2414 target_pid_to_str (lp
->ptid
),
2415 status_to_str (status
));
2419 /* Check if the thread has exited. */
2420 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2423 if (debug_linux_nat
)
2424 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2425 target_pid_to_str (lp
->ptid
));
2434 gdb_assert (WIFSTOPPED (status
));
2436 /* Handle GNU/Linux's syscall SIGTRAPs. */
2437 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2439 /* No longer need the sysgood bit. The ptrace event ends up
2440 recorded in lp->waitstatus if we care for it. We can carry
2441 on handling the event like a regular SIGTRAP from here
2443 status
= W_STOPCODE (SIGTRAP
);
2444 if (linux_handle_syscall_trap (lp
, 1))
2445 return wait_lwp (lp
);
2448 /* Handle GNU/Linux's extended waitstatus for trace events. */
2449 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2451 if (debug_linux_nat
)
2452 fprintf_unfiltered (gdb_stdlog
,
2453 "WL: Handling extended status 0x%06x\n",
2455 if (linux_handle_extended_wait (lp
, status
, 1))
2456 return wait_lwp (lp
);
2462 /* Save the most recent siginfo for LP. This is currently only called
2463 for SIGTRAP; some ports use the si_addr field for
2464 target_stopped_data_address. In the future, it may also be used to
2465 restore the siginfo of requeued signals. */
2468 save_siginfo (struct lwp_info
*lp
)
2471 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2472 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2475 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2478 /* Send a SIGSTOP to LP. */
2481 stop_callback (struct lwp_info
*lp
, void *data
)
2483 if (!lp
->stopped
&& !lp
->signalled
)
2487 if (debug_linux_nat
)
2489 fprintf_unfiltered (gdb_stdlog
,
2490 "SC: kill %s **<SIGSTOP>**\n",
2491 target_pid_to_str (lp
->ptid
));
2494 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2495 if (debug_linux_nat
)
2497 fprintf_unfiltered (gdb_stdlog
,
2498 "SC: lwp kill %d %s\n",
2500 errno
? safe_strerror (errno
) : "ERRNO-OK");
2504 gdb_assert (lp
->status
== 0);
2510 /* Return non-zero if LWP PID has a pending SIGINT. */
2513 linux_nat_has_pending_sigint (int pid
)
2515 sigset_t pending
, blocked
, ignored
;
2517 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2519 if (sigismember (&pending
, SIGINT
)
2520 && !sigismember (&ignored
, SIGINT
))
2526 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2529 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2531 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2532 flag to consume the next one. */
2533 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2534 && WSTOPSIG (lp
->status
) == SIGINT
)
2537 lp
->ignore_sigint
= 1;
2542 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2543 This function is called after we know the LWP has stopped; if the LWP
2544 stopped before the expected SIGINT was delivered, then it will never have
2545 arrived. Also, if the signal was delivered to a shared queue and consumed
2546 by a different thread, it will never be delivered to this LWP. */
2549 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2551 if (!lp
->ignore_sigint
)
2554 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2556 if (debug_linux_nat
)
2557 fprintf_unfiltered (gdb_stdlog
,
2558 "MCIS: Clearing bogus flag for %s\n",
2559 target_pid_to_str (lp
->ptid
));
2560 lp
->ignore_sigint
= 0;
2564 /* Fetch the possible triggered data watchpoint info and store it in
2567 On some archs, like x86, that use debug registers to set
2568 watchpoints, it's possible that the way to know which watched
2569 address trapped, is to check the register that is used to select
2570 which address to watch. Problem is, between setting the watchpoint
2571 and reading back which data address trapped, the user may change
2572 the set of watchpoints, and, as a consequence, GDB changes the
2573 debug registers in the inferior. To avoid reading back a stale
2574 stopped-data-address when that happens, we cache in LP the fact
2575 that a watchpoint trapped, and the corresponding data address, as
2576 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2577 registers meanwhile, we have the cached data we can rely on. */
2580 save_sigtrap (struct lwp_info
*lp
)
2582 struct cleanup
*old_chain
;
2584 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2586 lp
->stopped_by_watchpoint
= 0;
2590 old_chain
= save_inferior_ptid ();
2591 inferior_ptid
= lp
->ptid
;
2593 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2595 if (lp
->stopped_by_watchpoint
)
2597 if (linux_ops
->to_stopped_data_address
!= NULL
)
2598 lp
->stopped_data_address_p
=
2599 linux_ops
->to_stopped_data_address (¤t_target
,
2600 &lp
->stopped_data_address
);
2602 lp
->stopped_data_address_p
= 0;
2605 do_cleanups (old_chain
);
2608 /* See save_sigtrap. */
2611 linux_nat_stopped_by_watchpoint (void)
2613 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2615 gdb_assert (lp
!= NULL
);
2617 return lp
->stopped_by_watchpoint
;
2621 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2623 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2625 gdb_assert (lp
!= NULL
);
2627 *addr_p
= lp
->stopped_data_address
;
2629 return lp
->stopped_data_address_p
;
2632 /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
2635 sigtrap_is_event (int status
)
2637 return WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
;
2640 /* SIGTRAP-like events recognizer. */
2642 static int (*linux_nat_status_is_event
) (int status
) = sigtrap_is_event
;
2644 /* Check for SIGTRAP-like events in LP. */
2647 linux_nat_lp_status_is_event (struct lwp_info
*lp
)
2649 /* We check for lp->waitstatus in addition to lp->status, because we can
2650 have pending process exits recorded in lp->status
2651 and W_EXITCODE(0,0) == 0. We should probably have an additional
2652 lp->status_p flag. */
2654 return (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2655 && linux_nat_status_is_event (lp
->status
));
2658 /* Set alternative SIGTRAP-like events recognizer. If
2659 breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
2663 linux_nat_set_status_is_event (struct target_ops
*t
,
2664 int (*status_is_event
) (int status
))
2666 linux_nat_status_is_event
= status_is_event
;
2669 /* Wait until LP is stopped. */
2672 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2674 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2676 /* If this is a vfork parent, bail out, it is not going to report
2677 any SIGSTOP until the vfork is done with. */
2678 if (inf
->vfork_child
!= NULL
)
2685 status
= wait_lwp (lp
);
2689 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2690 && WSTOPSIG (status
) == SIGINT
)
2692 lp
->ignore_sigint
= 0;
2695 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2696 if (debug_linux_nat
)
2697 fprintf_unfiltered (gdb_stdlog
,
2698 "PTRACE_CONT %s, 0, 0 (%s) "
2699 "(discarding SIGINT)\n",
2700 target_pid_to_str (lp
->ptid
),
2701 errno
? safe_strerror (errno
) : "OK");
2703 return stop_wait_callback (lp
, NULL
);
2706 maybe_clear_ignore_sigint (lp
);
2708 if (WSTOPSIG (status
) != SIGSTOP
)
2710 if (linux_nat_status_is_event (status
))
2712 /* If a LWP other than the LWP that we're reporting an
2713 event for has hit a GDB breakpoint (as opposed to
2714 some random trap signal), then just arrange for it to
2715 hit it again later. We don't keep the SIGTRAP status
2716 and don't forward the SIGTRAP signal to the LWP. We
2717 will handle the current event, eventually we will
2718 resume all LWPs, and this one will get its breakpoint
2721 If we do not do this, then we run the risk that the
2722 user will delete or disable the breakpoint, but the
2723 thread will have already tripped on it. */
2725 /* Save the trap's siginfo in case we need it later. */
2730 /* Now resume this LWP and get the SIGSTOP event. */
2732 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2733 if (debug_linux_nat
)
2735 fprintf_unfiltered (gdb_stdlog
,
2736 "PTRACE_CONT %s, 0, 0 (%s)\n",
2737 target_pid_to_str (lp
->ptid
),
2738 errno
? safe_strerror (errno
) : "OK");
2740 fprintf_unfiltered (gdb_stdlog
,
2741 "SWC: Candidate SIGTRAP event in %s\n",
2742 target_pid_to_str (lp
->ptid
));
2744 /* Hold this event/waitstatus while we check to see if
2745 there are any more (we still want to get that SIGSTOP). */
2746 stop_wait_callback (lp
, NULL
);
2748 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2749 there's another event, throw it back into the
2753 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
));
2758 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2761 /* Save the sigtrap event. */
2762 lp
->status
= status
;
2767 /* The thread was stopped with a signal other than
2768 SIGSTOP, and didn't accidentally trip a breakpoint. */
2770 if (debug_linux_nat
)
2772 fprintf_unfiltered (gdb_stdlog
,
2773 "SWC: Pending event %s in %s\n",
2774 status_to_str ((int) status
),
2775 target_pid_to_str (lp
->ptid
));
2777 /* Now resume this LWP and get the SIGSTOP event. */
2779 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2780 if (debug_linux_nat
)
2781 fprintf_unfiltered (gdb_stdlog
,
2782 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2783 target_pid_to_str (lp
->ptid
),
2784 errno
? safe_strerror (errno
) : "OK");
2786 /* Hold this event/waitstatus while we check to see if
2787 there are any more (we still want to get that SIGSTOP). */
2788 stop_wait_callback (lp
, NULL
);
2790 /* If the lp->status field is still empty, use it to
2791 hold this event. If not, then this event must be
2792 returned to the event queue of the LWP. */
2795 if (debug_linux_nat
)
2797 fprintf_unfiltered (gdb_stdlog
,
2798 "SWC: kill %s, %s\n",
2799 target_pid_to_str (lp
->ptid
),
2800 status_to_str ((int) status
));
2802 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2805 lp
->status
= status
;
2811 /* We caught the SIGSTOP that we intended to catch, so
2812 there's no SIGSTOP pending. */
2821 /* Return non-zero if LP has a wait status pending. */
2824 status_callback (struct lwp_info
*lp
, void *data
)
2826 /* Only report a pending wait status if we pretend that this has
2827 indeed been resumed. */
2831 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2833 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2834 or a a pending process exit. Note that `W_EXITCODE(0,0) ==
2835 0', so a clean process exit can not be stored pending in
2836 lp->status, it is indistinguishable from
2837 no-pending-status. */
2841 if (lp
->status
!= 0)
2847 /* Return non-zero if LP isn't stopped. */
2850 running_callback (struct lwp_info
*lp
, void *data
)
2852 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2855 /* Count the LWP's that have had events. */
2858 count_events_callback (struct lwp_info
*lp
, void *data
)
2862 gdb_assert (count
!= NULL
);
2864 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2865 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2871 /* Select the LWP (if any) that is currently being single-stepped. */
2874 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2876 if (lp
->step
&& lp
->status
!= 0)
2882 /* Select the Nth LWP that has had a SIGTRAP event. */
2885 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2887 int *selector
= data
;
2889 gdb_assert (selector
!= NULL
);
2891 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2892 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2893 if ((*selector
)-- == 0)
2900 cancel_breakpoint (struct lwp_info
*lp
)
2902 /* Arrange for a breakpoint to be hit again later. We don't keep
2903 the SIGTRAP status and don't forward the SIGTRAP signal to the
2904 LWP. We will handle the current event, eventually we will resume
2905 this LWP, and this breakpoint will trap again.
2907 If we do not do this, then we run the risk that the user will
2908 delete or disable the breakpoint, but the LWP will have already
2911 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2912 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2915 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2916 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2918 if (debug_linux_nat
)
2919 fprintf_unfiltered (gdb_stdlog
,
2920 "CB: Push back breakpoint for %s\n",
2921 target_pid_to_str (lp
->ptid
));
2923 /* Back up the PC if necessary. */
2924 if (gdbarch_decr_pc_after_break (gdbarch
))
2925 regcache_write_pc (regcache
, pc
);
2933 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2935 struct lwp_info
*event_lp
= data
;
2937 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2941 /* If a LWP other than the LWP that we're reporting an event for has
2942 hit a GDB breakpoint (as opposed to some random trap signal),
2943 then just arrange for it to hit it again later. We don't keep
2944 the SIGTRAP status and don't forward the SIGTRAP signal to the
2945 LWP. We will handle the current event, eventually we will resume
2946 all LWPs, and this one will get its breakpoint trap again.
2948 If we do not do this, then we run the risk that the user will
2949 delete or disable the breakpoint, but the LWP will have already
2952 if (linux_nat_lp_status_is_event (lp
)
2953 && cancel_breakpoint (lp
))
2954 /* Throw away the SIGTRAP. */
2960 /* Select one LWP out of those that have events pending. */
2963 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2966 int random_selector
;
2967 struct lwp_info
*event_lp
;
2969 /* Record the wait status for the original LWP. */
2970 (*orig_lp
)->status
= *status
;
2972 /* Give preference to any LWP that is being single-stepped. */
2973 event_lp
= iterate_over_lwps (filter
,
2974 select_singlestep_lwp_callback
, NULL
);
2975 if (event_lp
!= NULL
)
2977 if (debug_linux_nat
)
2978 fprintf_unfiltered (gdb_stdlog
,
2979 "SEL: Select single-step %s\n",
2980 target_pid_to_str (event_lp
->ptid
));
2984 /* No single-stepping LWP. Select one at random, out of those
2985 which have had SIGTRAP events. */
2987 /* First see how many SIGTRAP events we have. */
2988 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2990 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2991 random_selector
= (int)
2992 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2994 if (debug_linux_nat
&& num_events
> 1)
2995 fprintf_unfiltered (gdb_stdlog
,
2996 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2997 num_events
, random_selector
);
2999 event_lp
= iterate_over_lwps (filter
,
3000 select_event_lwp_callback
,
3004 if (event_lp
!= NULL
)
3006 /* Switch the event LWP. */
3007 *orig_lp
= event_lp
;
3008 *status
= event_lp
->status
;
3011 /* Flush the wait status for the event LWP. */
3012 (*orig_lp
)->status
= 0;
3015 /* Return non-zero if LP has been resumed. */
3018 resumed_callback (struct lwp_info
*lp
, void *data
)
3023 /* Stop an active thread, verify it still exists, then resume it. */
3026 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
3028 struct lwp_info
*ptr
;
3030 if (!lp
->stopped
&& !lp
->signalled
)
3032 stop_callback (lp
, NULL
);
3033 stop_wait_callback (lp
, NULL
);
3034 /* Resume if the lwp still exists. */
3035 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
3038 resume_callback (lp
, NULL
);
3039 resume_set_callback (lp
, NULL
);
3045 /* Check if we should go on and pass this event to common code.
3046 Return the affected lwp if we are, or NULL otherwise. */
3047 static struct lwp_info
*
3048 linux_nat_filter_event (int lwpid
, int status
, int options
)
3050 struct lwp_info
*lp
;
3052 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3054 /* Check for stop events reported by a process we didn't already
3055 know about - anything not already in our LWP list.
3057 If we're expecting to receive stopped processes after
3058 fork, vfork, and clone events, then we'll just add the
3059 new one to our list and go back to waiting for the event
3060 to be reported - the stopped process might be returned
3061 from waitpid before or after the event is. */
3062 if (WIFSTOPPED (status
) && !lp
)
3064 linux_record_stopped_pid (lwpid
, status
);
3068 /* Make sure we don't report an event for the exit of an LWP not in
3069 our list, i.e. not part of the current process. This can happen
3070 if we detach from a program we original forked and then it
3072 if (!WIFSTOPPED (status
) && !lp
)
3075 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3076 CLONE_PTRACE processes which do not use the thread library -
3077 otherwise we wouldn't find the new LWP this way. That doesn't
3078 currently work, and the following code is currently unreachable
3079 due to the two blocks above. If it's fixed some day, this code
3080 should be broken out into a function so that we can also pick up
3081 LWPs from the new interface. */
3084 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3085 if (options
& __WCLONE
)
3088 gdb_assert (WIFSTOPPED (status
)
3089 && WSTOPSIG (status
) == SIGSTOP
);
3092 if (!in_thread_list (inferior_ptid
))
3094 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3095 GET_PID (inferior_ptid
));
3096 add_thread (inferior_ptid
);
3099 add_thread (lp
->ptid
);
3102 /* Handle GNU/Linux's syscall SIGTRAPs. */
3103 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3105 /* No longer need the sysgood bit. The ptrace event ends up
3106 recorded in lp->waitstatus if we care for it. We can carry
3107 on handling the event like a regular SIGTRAP from here
3109 status
= W_STOPCODE (SIGTRAP
);
3110 if (linux_handle_syscall_trap (lp
, 0))
3114 /* Handle GNU/Linux's extended waitstatus for trace events. */
3115 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3117 if (debug_linux_nat
)
3118 fprintf_unfiltered (gdb_stdlog
,
3119 "LLW: Handling extended status 0x%06x\n",
3121 if (linux_handle_extended_wait (lp
, status
, 0))
3125 if (linux_nat_status_is_event (status
))
3127 /* Save the trap's siginfo in case we need it later. */
3133 /* Check if the thread has exited. */
3134 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3135 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3137 /* If this is the main thread, we must stop all threads and verify
3138 if they are still alive. This is because in the nptl thread model
3139 on Linux 2.4, there is no signal issued for exiting LWPs
3140 other than the main thread. We only get the main thread exit
3141 signal once all child threads have already exited. If we
3142 stop all the threads and use the stop_wait_callback to check
3143 if they have exited we can determine whether this signal
3144 should be ignored or whether it means the end of the debugged
3145 application, regardless of which threading model is being
3147 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3150 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3151 stop_and_resume_callback
, NULL
);
3154 if (debug_linux_nat
)
3155 fprintf_unfiltered (gdb_stdlog
,
3156 "LLW: %s exited.\n",
3157 target_pid_to_str (lp
->ptid
));
3159 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3161 /* If there is at least one more LWP, then the exit signal
3162 was not the end of the debugged application and should be
3169 /* Check if the current LWP has previously exited. In the nptl
3170 thread model, LWPs other than the main thread do not issue
3171 signals when they exit so we must check whenever the thread has
3172 stopped. A similar check is made in stop_wait_callback(). */
3173 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3175 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3177 if (debug_linux_nat
)
3178 fprintf_unfiltered (gdb_stdlog
,
3179 "LLW: %s exited.\n",
3180 target_pid_to_str (lp
->ptid
));
3184 /* Make sure there is at least one thread running. */
3185 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3187 /* Discard the event. */
3191 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3192 an attempt to stop an LWP. */
3194 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3196 if (debug_linux_nat
)
3197 fprintf_unfiltered (gdb_stdlog
,
3198 "LLW: Delayed SIGSTOP caught for %s.\n",
3199 target_pid_to_str (lp
->ptid
));
3201 /* This is a delayed SIGSTOP. */
3204 registers_changed ();
3206 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3207 lp
->step
, TARGET_SIGNAL_0
);
3208 if (debug_linux_nat
)
3209 fprintf_unfiltered (gdb_stdlog
,
3210 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3212 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3213 target_pid_to_str (lp
->ptid
));
3216 gdb_assert (lp
->resumed
);
3218 /* Discard the event. */
3222 /* Make sure we don't report a SIGINT that we have already displayed
3223 for another thread. */
3224 if (lp
->ignore_sigint
3225 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3227 if (debug_linux_nat
)
3228 fprintf_unfiltered (gdb_stdlog
,
3229 "LLW: Delayed SIGINT caught for %s.\n",
3230 target_pid_to_str (lp
->ptid
));
3232 /* This is a delayed SIGINT. */
3233 lp
->ignore_sigint
= 0;
3235 registers_changed ();
3236 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3237 lp
->step
, TARGET_SIGNAL_0
);
3238 if (debug_linux_nat
)
3239 fprintf_unfiltered (gdb_stdlog
,
3240 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3242 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3243 target_pid_to_str (lp
->ptid
));
3246 gdb_assert (lp
->resumed
);
3248 /* Discard the event. */
3252 /* An interesting event. */
3254 lp
->status
= status
;
3259 linux_nat_wait_1 (struct target_ops
*ops
,
3260 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3263 static sigset_t prev_mask
;
3264 struct lwp_info
*lp
= NULL
;
3269 if (debug_linux_nat_async
)
3270 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3272 /* The first time we get here after starting a new inferior, we may
3273 not have added it to the LWP list yet - this is the earliest
3274 moment at which we know its PID. */
3275 if (ptid_is_pid (inferior_ptid
))
3277 /* Upgrade the main thread's ptid. */
3278 thread_change_ptid (inferior_ptid
,
3279 BUILD_LWP (GET_PID (inferior_ptid
),
3280 GET_PID (inferior_ptid
)));
3282 lp
= add_lwp (inferior_ptid
);
3286 /* Make sure SIGCHLD is blocked. */
3287 block_child_signals (&prev_mask
);
3289 if (ptid_equal (ptid
, minus_one_ptid
))
3291 else if (ptid_is_pid (ptid
))
3292 /* A request to wait for a specific tgid. This is not possible
3293 with waitpid, so instead, we wait for any child, and leave
3294 children we're not interested in right now with a pending
3295 status to report later. */
3298 pid
= GET_LWP (ptid
);
3304 /* Make sure that of those LWPs we want to get an event from, there
3305 is at least one LWP that has been resumed. If there's none, just
3306 bail out. The core may just be flushing asynchronously all
3308 if (iterate_over_lwps (ptid
, resumed_callback
, NULL
) == NULL
)
3310 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3312 if (debug_linux_nat_async
)
3313 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (no resumed LWP)\n");
3315 restore_child_signals_mask (&prev_mask
);
3316 return minus_one_ptid
;
3319 /* First check if there is a LWP with a wait status pending. */
3322 /* Any LWP that's been resumed will do. */
3323 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3326 if (debug_linux_nat
&& lp
->status
)
3327 fprintf_unfiltered (gdb_stdlog
,
3328 "LLW: Using pending wait status %s for %s.\n",
3329 status_to_str (lp
->status
),
3330 target_pid_to_str (lp
->ptid
));
3333 /* But if we don't find one, we'll have to wait, and check both
3334 cloned and uncloned processes. We start with the cloned
3336 options
= __WCLONE
| WNOHANG
;
3338 else if (is_lwp (ptid
))
3340 if (debug_linux_nat
)
3341 fprintf_unfiltered (gdb_stdlog
,
3342 "LLW: Waiting for specific LWP %s.\n",
3343 target_pid_to_str (ptid
));
3345 /* We have a specific LWP to check. */
3346 lp
= find_lwp_pid (ptid
);
3349 if (debug_linux_nat
&& lp
->status
)
3350 fprintf_unfiltered (gdb_stdlog
,
3351 "LLW: Using pending wait status %s for %s.\n",
3352 status_to_str (lp
->status
),
3353 target_pid_to_str (lp
->ptid
));
3355 /* If we have to wait, take into account whether PID is a cloned
3356 process or not. And we have to convert it to something that
3357 the layer beneath us can understand. */
3358 options
= lp
->cloned
? __WCLONE
: 0;
3359 pid
= GET_LWP (ptid
);
3361 /* We check for lp->waitstatus in addition to lp->status,
3362 because we can have pending process exits recorded in
3363 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3364 an additional lp->status_p flag. */
3365 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3369 if (lp
&& lp
->signalled
)
3371 /* A pending SIGSTOP may interfere with the normal stream of
3372 events. In a typical case where interference is a problem,
3373 we have a SIGSTOP signal pending for LWP A while
3374 single-stepping it, encounter an event in LWP B, and take the
3375 pending SIGSTOP while trying to stop LWP A. After processing
3376 the event in LWP B, LWP A is continued, and we'll never see
3377 the SIGTRAP associated with the last time we were
3378 single-stepping LWP A. */
3380 /* Resume the thread. It should halt immediately returning the
3382 registers_changed ();
3383 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3384 lp
->step
, TARGET_SIGNAL_0
);
3385 if (debug_linux_nat
)
3386 fprintf_unfiltered (gdb_stdlog
,
3387 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3388 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3389 target_pid_to_str (lp
->ptid
));
3391 gdb_assert (lp
->resumed
);
3393 /* Catch the pending SIGSTOP. */
3394 status
= lp
->status
;
3397 stop_wait_callback (lp
, NULL
);
3399 /* If the lp->status field isn't empty, we caught another signal
3400 while flushing the SIGSTOP. Return it back to the event
3401 queue of the LWP, as we already have an event to handle. */
3404 if (debug_linux_nat
)
3405 fprintf_unfiltered (gdb_stdlog
,
3406 "LLW: kill %s, %s\n",
3407 target_pid_to_str (lp
->ptid
),
3408 status_to_str (lp
->status
));
3409 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3412 lp
->status
= status
;
3415 if (!target_can_async_p ())
3417 /* Causes SIGINT to be passed on to the attached process. */
3421 /* Translate generic target_wait options into waitpid options. */
3422 if (target_options
& TARGET_WNOHANG
)
3429 lwpid
= my_waitpid (pid
, &status
, options
);
3433 gdb_assert (pid
== -1 || lwpid
== pid
);
3435 if (debug_linux_nat
)
3437 fprintf_unfiltered (gdb_stdlog
,
3438 "LLW: waitpid %ld received %s\n",
3439 (long) lwpid
, status_to_str (status
));
3442 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3444 /* STATUS is now no longer valid, use LP->STATUS instead. */
3448 && ptid_is_pid (ptid
)
3449 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3451 gdb_assert (lp
->resumed
);
3453 if (debug_linux_nat
)
3455 "LWP %ld got an event %06x, leaving pending.\n",
3456 ptid_get_lwp (lp
->ptid
), lp
->status
);
3458 if (WIFSTOPPED (lp
->status
))
3460 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3462 /* Cancel breakpoint hits. The breakpoint may
3463 be removed before we fetch events from this
3464 process to report to the core. It is best
3465 not to assume the moribund breakpoints
3466 heuristic always handles these cases --- it
3467 could be too many events go through to the
3468 core before this one is handled. All-stop
3469 always cancels breakpoint hits in all
3472 && linux_nat_lp_status_is_event (lp
)
3473 && cancel_breakpoint (lp
))
3475 /* Throw away the SIGTRAP. */
3478 if (debug_linux_nat
)
3480 "LLW: LWP %ld hit a breakpoint while"
3481 " waiting for another process;"
3483 ptid_get_lwp (lp
->ptid
));
3493 else if (WIFEXITED (lp
->status
) || WIFSIGNALED (lp
->status
))
3495 if (debug_linux_nat
)
3497 "Process %ld exited while stopping LWPs\n",
3498 ptid_get_lwp (lp
->ptid
));
3500 /* This was the last lwp in the process. Since
3501 events are serialized to GDB core, and we can't
3502 report this one right now, but GDB core and the
3503 other target layers will want to be notified
3504 about the exit code/signal, leave the status
3505 pending for the next time we're able to report
3508 /* Prevent trying to stop this thread again. We'll
3509 never try to resume it because it has a pending
3513 /* Dead LWP's aren't expected to reported a pending
3517 /* Store the pending event in the waitstatus as
3518 well, because W_EXITCODE(0,0) == 0. */
3519 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3533 /* waitpid did return something. Restart over. */
3534 options
|= __WCLONE
;
3542 /* Alternate between checking cloned and uncloned processes. */
3543 options
^= __WCLONE
;
3545 /* And every time we have checked both:
3546 In async mode, return to event loop;
3547 In sync mode, suspend waiting for a SIGCHLD signal. */
3548 if (options
& __WCLONE
)
3550 if (target_options
& TARGET_WNOHANG
)
3552 /* No interesting event. */
3553 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3555 if (debug_linux_nat_async
)
3556 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3558 restore_child_signals_mask (&prev_mask
);
3559 return minus_one_ptid
;
3562 sigsuspend (&suspend_mask
);
3565 else if (target_options
& TARGET_WNOHANG
)
3567 /* No interesting event for PID yet. */
3568 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3570 if (debug_linux_nat_async
)
3571 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3573 restore_child_signals_mask (&prev_mask
);
3574 return minus_one_ptid
;
3577 /* We shouldn't end up here unless we want to try again. */
3578 gdb_assert (lp
== NULL
);
3581 if (!target_can_async_p ())
3582 clear_sigint_trap ();
3586 status
= lp
->status
;
3589 /* Don't report signals that GDB isn't interested in, such as
3590 signals that are neither printed nor stopped upon. Stopping all
3591 threads can be a bit time-consuming so if we want decent
3592 performance with heavily multi-threaded programs, especially when
3593 they're using a high frequency timer, we'd better avoid it if we
3596 if (WIFSTOPPED (status
))
3598 enum target_signal signo
= target_signal_from_host (WSTOPSIG (status
));
3599 struct inferior
*inf
;
3601 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
3604 /* Defer to common code if we get a signal while
3605 single-stepping, since that may need special care, e.g. to
3606 skip the signal handler, or, if we're gaining control of the
3609 && inf
->control
.stop_soon
== NO_STOP_QUIETLY
3610 && signal_stop_state (signo
) == 0
3611 && signal_print_state (signo
) == 0
3612 && signal_pass_state (signo
) == 1)
3614 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3615 here? It is not clear we should. GDB may not expect
3616 other threads to run. On the other hand, not resuming
3617 newly attached threads may cause an unwanted delay in
3618 getting them running. */
3619 registers_changed ();
3620 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3622 if (debug_linux_nat
)
3623 fprintf_unfiltered (gdb_stdlog
,
3624 "LLW: %s %s, %s (preempt 'handle')\n",
3626 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3627 target_pid_to_str (lp
->ptid
),
3628 (signo
!= TARGET_SIGNAL_0
3629 ? strsignal (target_signal_to_host (signo
))
3637 /* Only do the below in all-stop, as we currently use SIGINT
3638 to implement target_stop (see linux_nat_stop) in
3640 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3642 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3643 forwarded to the entire process group, that is, all LWPs
3644 will receive it - unless they're using CLONE_THREAD to
3645 share signals. Since we only want to report it once, we
3646 mark it as ignored for all LWPs except this one. */
3647 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3648 set_ignore_sigint
, NULL
);
3649 lp
->ignore_sigint
= 0;
3652 maybe_clear_ignore_sigint (lp
);
3656 /* This LWP is stopped now. */
3659 if (debug_linux_nat
)
3660 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3661 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3665 /* Now stop all other LWP's ... */
3666 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3668 /* ... and wait until all of them have reported back that
3669 they're no longer running. */
3670 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3672 /* If we're not waiting for a specific LWP, choose an event LWP
3673 from among those that have had events. Giving equal priority
3674 to all LWPs that have had events helps prevent
3677 select_event_lwp (ptid
, &lp
, &status
);
3679 /* Now that we've selected our final event LWP, cancel any
3680 breakpoints in other LWPs that have hit a GDB breakpoint.
3681 See the comment in cancel_breakpoints_callback to find out
3683 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3685 /* In all-stop, from the core's perspective, all LWPs are now
3686 stopped until a new resume action is sent over. */
3687 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
3692 if (linux_nat_status_is_event (status
))
3694 if (debug_linux_nat
)
3695 fprintf_unfiltered (gdb_stdlog
,
3696 "LLW: trap ptid is %s.\n",
3697 target_pid_to_str (lp
->ptid
));
3700 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3702 *ourstatus
= lp
->waitstatus
;
3703 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3706 store_waitstatus (ourstatus
, status
);
3708 if (debug_linux_nat_async
)
3709 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3711 restore_child_signals_mask (&prev_mask
);
3713 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
3714 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
3717 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3722 /* Resume LWPs that are currently stopped without any pending status
3723 to report, but are resumed from the core's perspective. */
3726 resume_stopped_resumed_lwps (struct lwp_info
*lp
, void *data
)
3728 ptid_t
*wait_ptid_p
= data
;
3733 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3735 gdb_assert (is_executing (lp
->ptid
));
3737 /* Don't bother if there's a breakpoint at PC that we'd hit
3738 immediately, and we're not waiting for this LWP. */
3739 if (!ptid_match (lp
->ptid
, *wait_ptid_p
))
3741 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
3742 CORE_ADDR pc
= regcache_read_pc (regcache
);
3744 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3748 if (debug_linux_nat
)
3749 fprintf_unfiltered (gdb_stdlog
,
3750 "RSRL: resuming stopped-resumed LWP %s\n",
3751 target_pid_to_str (lp
->ptid
));
3753 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3754 lp
->step
, TARGET_SIGNAL_0
);
3756 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
3757 lp
->stopped_by_watchpoint
= 0;
3764 linux_nat_wait (struct target_ops
*ops
,
3765 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3770 if (debug_linux_nat
)
3771 fprintf_unfiltered (gdb_stdlog
,
3772 "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3774 /* Flush the async file first. */
3775 if (target_can_async_p ())
3776 async_file_flush ();
3778 /* Resume LWPs that are currently stopped without any pending status
3779 to report, but are resumed from the core's perspective. LWPs get
3780 in this state if we find them stopping at a time we're not
3781 interested in reporting the event (target_wait on a
3782 specific_process, for example, see linux_nat_wait_1), and
3783 meanwhile the event became uninteresting. Don't bother resuming
3784 LWPs we're not going to wait for if they'd stop immediately. */
3786 iterate_over_lwps (minus_one_ptid
, resume_stopped_resumed_lwps
, &ptid
);
3788 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3790 /* If we requested any event, and something came out, assume there
3791 may be more. If we requested a specific lwp or process, also
3792 assume there may be more. */
3793 if (target_can_async_p ()
3794 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3795 || !ptid_equal (ptid
, minus_one_ptid
)))
3798 /* Get ready for the next event. */
3799 if (target_can_async_p ())
3800 target_async (inferior_event_handler
, 0);
3806 kill_callback (struct lwp_info
*lp
, void *data
)
3809 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3810 if (debug_linux_nat
)
3811 fprintf_unfiltered (gdb_stdlog
,
3812 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3813 target_pid_to_str (lp
->ptid
),
3814 errno
? safe_strerror (errno
) : "OK");
3820 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3824 /* We must make sure that there are no pending events (delayed
3825 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3826 program doesn't interfere with any following debugging session. */
3828 /* For cloned processes we must check both with __WCLONE and
3829 without, since the exit status of a cloned process isn't reported
3835 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3836 if (pid
!= (pid_t
) -1)
3838 if (debug_linux_nat
)
3839 fprintf_unfiltered (gdb_stdlog
,
3840 "KWC: wait %s received unknown.\n",
3841 target_pid_to_str (lp
->ptid
));
3842 /* The Linux kernel sometimes fails to kill a thread
3843 completely after PTRACE_KILL; that goes from the stop
3844 point in do_fork out to the one in
3845 get_signal_to_deliever and waits again. So kill it
3847 kill_callback (lp
, NULL
);
3850 while (pid
== GET_LWP (lp
->ptid
));
3852 gdb_assert (pid
== -1 && errno
== ECHILD
);
3857 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3858 if (pid
!= (pid_t
) -1)
3860 if (debug_linux_nat
)
3861 fprintf_unfiltered (gdb_stdlog
,
3862 "KWC: wait %s received unk.\n",
3863 target_pid_to_str (lp
->ptid
));
3864 /* See the call to kill_callback above. */
3865 kill_callback (lp
, NULL
);
3868 while (pid
== GET_LWP (lp
->ptid
));
3870 gdb_assert (pid
== -1 && errno
== ECHILD
);
3875 linux_nat_kill (struct target_ops
*ops
)
3877 struct target_waitstatus last
;
3881 /* If we're stopped while forking and we haven't followed yet,
3882 kill the other task. We need to do this first because the
3883 parent will be sleeping if this is a vfork. */
3885 get_last_target_status (&last_ptid
, &last
);
3887 if (last
.kind
== TARGET_WAITKIND_FORKED
3888 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3890 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3894 if (forks_exist_p ())
3895 linux_fork_killall ();
3898 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3900 /* Stop all threads before killing them, since ptrace requires
3901 that the thread is stopped to sucessfully PTRACE_KILL. */
3902 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3903 /* ... and wait until all of them have reported back that
3904 they're no longer running. */
3905 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3907 /* Kill all LWP's ... */
3908 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3910 /* ... and wait until we've flushed all events. */
3911 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3914 target_mourn_inferior ();
3918 linux_nat_mourn_inferior (struct target_ops
*ops
)
3920 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3922 if (! forks_exist_p ())
3923 /* Normal case, no other forks available. */
3924 linux_ops
->to_mourn_inferior (ops
);
3926 /* Multi-fork case. The current inferior_ptid has exited, but
3927 there are other viable forks to debug. Delete the exiting
3928 one and context-switch to the first available. */
3929 linux_fork_mourn_inferior ();
3932 /* Convert a native/host siginfo object, into/from the siginfo in the
3933 layout of the inferiors' architecture. */
3936 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3940 if (linux_nat_siginfo_fixup
!= NULL
)
3941 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3943 /* If there was no callback, or the callback didn't do anything,
3944 then just do a straight memcpy. */
3948 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3950 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3955 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3956 const char *annex
, gdb_byte
*readbuf
,
3957 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3960 struct siginfo siginfo
;
3961 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3963 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3964 gdb_assert (readbuf
|| writebuf
);
3966 pid
= GET_LWP (inferior_ptid
);
3968 pid
= GET_PID (inferior_ptid
);
3970 if (offset
> sizeof (siginfo
))
3974 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3978 /* When GDB is built as a 64-bit application, ptrace writes into
3979 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3980 inferior with a 64-bit GDB should look the same as debugging it
3981 with a 32-bit GDB, we need to convert it. GDB core always sees
3982 the converted layout, so any read/write will have to be done
3984 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3986 if (offset
+ len
> sizeof (siginfo
))
3987 len
= sizeof (siginfo
) - offset
;
3989 if (readbuf
!= NULL
)
3990 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3993 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3995 /* Convert back to ptrace layout before flushing it out. */
3996 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3999 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
4008 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4009 const char *annex
, gdb_byte
*readbuf
,
4010 const gdb_byte
*writebuf
,
4011 ULONGEST offset
, LONGEST len
)
4013 struct cleanup
*old_chain
;
4016 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
4017 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
4020 /* The target is connected but no live inferior is selected. Pass
4021 this request down to a lower stratum (e.g., the executable
4023 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
4026 old_chain
= save_inferior_ptid ();
4028 if (is_lwp (inferior_ptid
))
4029 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
4031 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
4034 do_cleanups (old_chain
);
4039 linux_thread_alive (ptid_t ptid
)
4043 gdb_assert (is_lwp (ptid
));
4045 /* Send signal 0 instead of anything ptrace, because ptracing a
4046 running thread errors out claiming that the thread doesn't
4048 err
= kill_lwp (GET_LWP (ptid
), 0);
4050 if (debug_linux_nat
)
4051 fprintf_unfiltered (gdb_stdlog
,
4052 "LLTA: KILL(SIG0) %s (%s)\n",
4053 target_pid_to_str (ptid
),
4054 err
? safe_strerror (err
) : "OK");
4063 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
4065 return linux_thread_alive (ptid
);
4069 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
4071 static char buf
[64];
4074 && (GET_PID (ptid
) != GET_LWP (ptid
)
4075 || num_lwps (GET_PID (ptid
)) > 1))
4077 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
4081 return normal_pid_to_str (ptid
);
4084 /* Accepts an integer PID; Returns a string representing a file that
4085 can be opened to get the symbols for the child process. */
4088 linux_child_pid_to_exec_file (int pid
)
4090 char *name1
, *name2
;
4092 name1
= xmalloc (MAXPATHLEN
);
4093 name2
= xmalloc (MAXPATHLEN
);
4094 make_cleanup (xfree
, name1
);
4095 make_cleanup (xfree
, name2
);
4096 memset (name2
, 0, MAXPATHLEN
);
4098 sprintf (name1
, "/proc/%d/exe", pid
);
4099 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
4105 /* Service function for corefiles and info proc. */
4108 read_mapping (FILE *mapfile
,
4113 char *device
, long long *inode
, char *filename
)
4115 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
4116 addr
, endaddr
, permissions
, offset
, device
, inode
);
4119 if (ret
> 0 && ret
!= EOF
)
4121 /* Eat everything up to EOL for the filename. This will prevent
4122 weird filenames (such as one with embedded whitespace) from
4123 confusing this code. It also makes this code more robust in
4124 respect to annotations the kernel may add after the filename.
4126 Note the filename is used for informational purposes
4128 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4131 return (ret
!= 0 && ret
!= EOF
);
4134 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4135 regions in the inferior for a corefile. */
4138 linux_nat_find_memory_regions (find_memory_region_ftype func
, void *obfd
)
4140 int pid
= PIDGET (inferior_ptid
);
4141 char mapsfilename
[MAXPATHLEN
];
4143 long long addr
, endaddr
, size
, offset
, inode
;
4144 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4145 int read
, write
, exec
;
4146 struct cleanup
*cleanup
;
4148 /* Compose the filename for the /proc memory map, and open it. */
4149 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4150 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4151 error (_("Could not open %s."), mapsfilename
);
4152 cleanup
= make_cleanup_fclose (mapsfile
);
4155 fprintf_filtered (gdb_stdout
,
4156 "Reading memory regions from %s\n", mapsfilename
);
4158 /* Now iterate until end-of-file. */
4159 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4160 &offset
, &device
[0], &inode
, &filename
[0]))
4162 size
= endaddr
- addr
;
4164 /* Get the segment's permissions. */
4165 read
= (strchr (permissions
, 'r') != 0);
4166 write
= (strchr (permissions
, 'w') != 0);
4167 exec
= (strchr (permissions
, 'x') != 0);
4171 fprintf_filtered (gdb_stdout
,
4172 "Save segment, %s bytes at %s (%c%c%c)",
4173 plongest (size
), paddress (target_gdbarch
, addr
),
4175 write
? 'w' : ' ', exec
? 'x' : ' ');
4177 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4178 fprintf_filtered (gdb_stdout
, "\n");
4181 /* Invoke the callback function to create the corefile
4183 func (addr
, size
, read
, write
, exec
, obfd
);
4185 do_cleanups (cleanup
);
4190 find_signalled_thread (struct thread_info
*info
, void *data
)
4192 if (info
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4193 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4199 static enum target_signal
4200 find_stop_signal (void)
4202 struct thread_info
*info
=
4203 iterate_over_threads (find_signalled_thread
, NULL
);
4206 return info
->suspend
.stop_signal
;
4208 return TARGET_SIGNAL_0
;
4211 /* Records the thread's register state for the corefile note
4215 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4216 char *note_data
, int *note_size
,
4217 enum target_signal stop_signal
)
4219 unsigned long lwp
= ptid_get_lwp (ptid
);
4220 struct gdbarch
*gdbarch
= target_gdbarch
;
4221 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4222 const struct regset
*regset
;
4224 struct cleanup
*old_chain
;
4225 struct core_regset_section
*sect_list
;
4228 old_chain
= save_inferior_ptid ();
4229 inferior_ptid
= ptid
;
4230 target_fetch_registers (regcache
, -1);
4231 do_cleanups (old_chain
);
4233 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4234 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4236 /* The loop below uses the new struct core_regset_section, which stores
4237 the supported section names and sizes for the core file. Note that
4238 note PRSTATUS needs to be treated specially. But the other notes are
4239 structurally the same, so they can benefit from the new struct. */
4240 if (core_regset_p
&& sect_list
!= NULL
)
4241 while (sect_list
->sect_name
!= NULL
)
4243 regset
= gdbarch_regset_from_core_section (gdbarch
,
4244 sect_list
->sect_name
,
4246 gdb_assert (regset
&& regset
->collect_regset
);
4247 gdb_regset
= xmalloc (sect_list
->size
);
4248 regset
->collect_regset (regset
, regcache
, -1,
4249 gdb_regset
, sect_list
->size
);
4251 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4252 note_data
= (char *) elfcore_write_prstatus
4253 (obfd
, note_data
, note_size
,
4254 lwp
, target_signal_to_host (stop_signal
),
4257 note_data
= (char *) elfcore_write_register_note
4258 (obfd
, note_data
, note_size
,
4259 sect_list
->sect_name
, gdb_regset
,
4265 /* For architectures that does not have the struct core_regset_section
4266 implemented, we use the old method. When all the architectures have
4267 the new support, the code below should be deleted. */
4270 gdb_gregset_t gregs
;
4271 gdb_fpregset_t fpregs
;
4274 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4276 != NULL
&& regset
->collect_regset
!= NULL
)
4277 regset
->collect_regset (regset
, regcache
, -1,
4278 &gregs
, sizeof (gregs
));
4280 fill_gregset (regcache
, &gregs
, -1);
4282 note_data
= (char *) elfcore_write_prstatus
4283 (obfd
, note_data
, note_size
, lwp
, target_signal_to_host (stop_signal
),
4287 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4289 != NULL
&& regset
->collect_regset
!= NULL
)
4290 regset
->collect_regset (regset
, regcache
, -1,
4291 &fpregs
, sizeof (fpregs
));
4293 fill_fpregset (regcache
, &fpregs
, -1);
4295 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4298 &fpregs
, sizeof (fpregs
));
4304 struct linux_nat_corefile_thread_data
4310 enum target_signal stop_signal
;
4313 /* Called by gdbthread.c once per thread. Records the thread's
4314 register state for the corefile note section. */
4317 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4319 struct linux_nat_corefile_thread_data
*args
= data
;
4321 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4331 /* Enumerate spufs IDs for process PID. */
4334 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4338 struct dirent
*entry
;
4340 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4341 dir
= opendir (path
);
4346 while ((entry
= readdir (dir
)) != NULL
)
4352 fd
= atoi (entry
->d_name
);
4356 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4357 if (stat (path
, &st
) != 0)
4359 if (!S_ISDIR (st
.st_mode
))
4362 if (statfs (path
, &stfs
) != 0)
4364 if (stfs
.f_type
!= SPUFS_MAGIC
)
4367 callback (data
, fd
);
4373 /* Generate corefile notes for SPU contexts. */
4375 struct linux_spu_corefile_data
4383 linux_spu_corefile_callback (void *data
, int fd
)
4385 struct linux_spu_corefile_data
*args
= data
;
4388 static const char *spu_files
[] =
4410 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4412 char annex
[32], note_name
[32];
4416 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4417 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4421 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4422 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4423 args
->note_size
, note_name
,
4424 NT_SPU
, spu_data
, spu_len
);
4431 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4433 struct linux_spu_corefile_data args
;
4436 args
.note_data
= note_data
;
4437 args
.note_size
= note_size
;
4439 iterate_over_spus (PIDGET (inferior_ptid
),
4440 linux_spu_corefile_callback
, &args
);
4442 return args
.note_data
;
4445 /* Fills the "to_make_corefile_note" target vector. Builds the note
4446 section for a corefile, and returns it in a malloc buffer. */
4449 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4451 struct linux_nat_corefile_thread_data thread_args
;
4452 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4453 char fname
[16] = { '\0' };
4454 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4455 char psargs
[80] = { '\0' };
4456 char *note_data
= NULL
;
4457 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4461 if (get_exec_file (0))
4463 strncpy (fname
, strrchr (get_exec_file (0), '/') + 1, sizeof (fname
));
4464 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4465 if (get_inferior_args ())
4468 char *psargs_end
= psargs
+ sizeof (psargs
);
4470 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4472 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4473 if (string_end
!= NULL
)
4475 *string_end
++ = ' ';
4476 strncpy (string_end
, get_inferior_args (),
4477 psargs_end
- string_end
);
4480 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4482 note_size
, fname
, psargs
);
4485 /* Dump information for threads. */
4486 thread_args
.obfd
= obfd
;
4487 thread_args
.note_data
= note_data
;
4488 thread_args
.note_size
= note_size
;
4489 thread_args
.num_notes
= 0;
4490 thread_args
.stop_signal
= find_stop_signal ();
4491 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4492 gdb_assert (thread_args
.num_notes
!= 0);
4493 note_data
= thread_args
.note_data
;
4495 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4499 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4500 "CORE", NT_AUXV
, auxv
, auxv_len
);
4504 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4506 make_cleanup (xfree
, note_data
);
4510 /* Implement the "info proc" command. */
4513 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4515 /* A long is used for pid instead of an int to avoid a loss of precision
4516 compiler warning from the output of strtoul. */
4517 long pid
= PIDGET (inferior_ptid
);
4520 char buffer
[MAXPATHLEN
];
4521 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4533 /* Break up 'args' into an argv array. */
4534 argv
= gdb_buildargv (args
);
4535 make_cleanup_freeargv (argv
);
4537 while (argv
!= NULL
&& *argv
!= NULL
)
4539 if (isdigit (argv
[0][0]))
4541 pid
= strtoul (argv
[0], NULL
, 10);
4543 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4547 else if (strcmp (argv
[0], "status") == 0)
4551 else if (strcmp (argv
[0], "stat") == 0)
4555 else if (strcmp (argv
[0], "cmd") == 0)
4559 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4563 else if (strcmp (argv
[0], "cwd") == 0)
4567 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4573 /* [...] (future options here) */
4578 error (_("No current process: you must name one."));
4580 sprintf (fname1
, "/proc/%ld", pid
);
4581 if (stat (fname1
, &dummy
) != 0)
4582 error (_("No /proc directory: '%s'"), fname1
);
4584 printf_filtered (_("process %ld\n"), pid
);
4585 if (cmdline_f
|| all
)
4587 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4588 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4590 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4592 if (fgets (buffer
, sizeof (buffer
), procfile
))
4593 printf_filtered ("cmdline = '%s'\n", buffer
);
4595 warning (_("unable to read '%s'"), fname1
);
4596 do_cleanups (cleanup
);
4599 warning (_("unable to open /proc file '%s'"), fname1
);
4603 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4604 memset (fname2
, 0, sizeof (fname2
));
4605 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4606 printf_filtered ("cwd = '%s'\n", fname2
);
4608 warning (_("unable to read link '%s'"), fname1
);
4612 sprintf (fname1
, "/proc/%ld/exe", pid
);
4613 memset (fname2
, 0, sizeof (fname2
));
4614 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4615 printf_filtered ("exe = '%s'\n", fname2
);
4617 warning (_("unable to read link '%s'"), fname1
);
4619 if (mappings_f
|| all
)
4621 sprintf (fname1
, "/proc/%ld/maps", pid
);
4622 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4624 long long addr
, endaddr
, size
, offset
, inode
;
4625 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4626 struct cleanup
*cleanup
;
4628 cleanup
= make_cleanup_fclose (procfile
);
4629 printf_filtered (_("Mapped address spaces:\n\n"));
4630 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4632 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4635 " Size", " Offset", "objfile");
4639 printf_filtered (" %18s %18s %10s %10s %7s\n",
4642 " Size", " Offset", "objfile");
4645 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4646 &offset
, &device
[0], &inode
, &filename
[0]))
4648 size
= endaddr
- addr
;
4650 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4651 calls here (and possibly above) should be abstracted
4652 out into their own functions? Andrew suggests using
4653 a generic local_address_string instead to print out
4654 the addresses; that makes sense to me, too. */
4656 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4658 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4659 (unsigned long) addr
, /* FIXME: pr_addr */
4660 (unsigned long) endaddr
,
4662 (unsigned int) offset
,
4663 filename
[0] ? filename
: "");
4667 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4668 (unsigned long) addr
, /* FIXME: pr_addr */
4669 (unsigned long) endaddr
,
4671 (unsigned int) offset
,
4672 filename
[0] ? filename
: "");
4676 do_cleanups (cleanup
);
4679 warning (_("unable to open /proc file '%s'"), fname1
);
4681 if (status_f
|| all
)
4683 sprintf (fname1
, "/proc/%ld/status", pid
);
4684 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4686 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4688 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4689 puts_filtered (buffer
);
4690 do_cleanups (cleanup
);
4693 warning (_("unable to open /proc file '%s'"), fname1
);
4697 sprintf (fname1
, "/proc/%ld/stat", pid
);
4698 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4703 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4705 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4706 printf_filtered (_("Process: %d\n"), itmp
);
4707 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4708 printf_filtered (_("Exec file: %s\n"), buffer
);
4709 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4710 printf_filtered (_("State: %c\n"), ctmp
);
4711 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4712 printf_filtered (_("Parent process: %d\n"), itmp
);
4713 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4714 printf_filtered (_("Process group: %d\n"), itmp
);
4715 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4716 printf_filtered (_("Session id: %d\n"), itmp
);
4717 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4718 printf_filtered (_("TTY: %d\n"), itmp
);
4719 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4720 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4721 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4722 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4723 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4724 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4725 (unsigned long) ltmp
);
4726 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4727 printf_filtered (_("Minor faults, children: %lu\n"),
4728 (unsigned long) ltmp
);
4729 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4730 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4731 (unsigned long) ltmp
);
4732 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4733 printf_filtered (_("Major faults, children: %lu\n"),
4734 (unsigned long) ltmp
);
4735 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4736 printf_filtered (_("utime: %ld\n"), ltmp
);
4737 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4738 printf_filtered (_("stime: %ld\n"), ltmp
);
4739 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4740 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4741 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4742 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4743 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4744 printf_filtered (_("jiffies remaining in current "
4745 "time slice: %ld\n"), ltmp
);
4746 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4747 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4748 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4749 printf_filtered (_("jiffies until next timeout: %lu\n"),
4750 (unsigned long) ltmp
);
4751 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4752 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4753 (unsigned long) ltmp
);
4754 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4755 printf_filtered (_("start time (jiffies since "
4756 "system boot): %ld\n"), ltmp
);
4757 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4758 printf_filtered (_("Virtual memory size: %lu\n"),
4759 (unsigned long) ltmp
);
4760 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4761 printf_filtered (_("Resident set size: %lu\n"),
4762 (unsigned long) ltmp
);
4763 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4764 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4765 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4766 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4767 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4768 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4769 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4770 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4771 #if 0 /* Don't know how architecture-dependent the rest is...
4772 Anyway the signal bitmap info is available from "status". */
4773 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4774 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4775 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4776 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4777 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4778 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4779 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4780 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4781 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4782 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4783 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4784 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4785 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4786 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4788 do_cleanups (cleanup
);
4791 warning (_("unable to open /proc file '%s'"), fname1
);
4795 /* Implement the to_xfer_partial interface for memory reads using the /proc
4796 filesystem. Because we can use a single read() call for /proc, this
4797 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4798 but it doesn't support writes. */
4801 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4802 const char *annex
, gdb_byte
*readbuf
,
4803 const gdb_byte
*writebuf
,
4804 ULONGEST offset
, LONGEST len
)
4810 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4813 /* Don't bother for one word. */
4814 if (len
< 3 * sizeof (long))
4817 /* We could keep this file open and cache it - possibly one per
4818 thread. That requires some juggling, but is even faster. */
4819 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4820 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4824 /* If pread64 is available, use it. It's faster if the kernel
4825 supports it (only one syscall), and it's 64-bit safe even on
4826 32-bit platforms (for instance, SPARC debugging a SPARC64
4829 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4831 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4842 /* Enumerate spufs IDs for process PID. */
4844 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4846 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4848 LONGEST written
= 0;
4851 struct dirent
*entry
;
4853 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4854 dir
= opendir (path
);
4859 while ((entry
= readdir (dir
)) != NULL
)
4865 fd
= atoi (entry
->d_name
);
4869 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4870 if (stat (path
, &st
) != 0)
4872 if (!S_ISDIR (st
.st_mode
))
4875 if (statfs (path
, &stfs
) != 0)
4877 if (stfs
.f_type
!= SPUFS_MAGIC
)
4880 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4882 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4892 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4893 object type, using the /proc file system. */
4895 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4896 const char *annex
, gdb_byte
*readbuf
,
4897 const gdb_byte
*writebuf
,
4898 ULONGEST offset
, LONGEST len
)
4903 int pid
= PIDGET (inferior_ptid
);
4910 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4913 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4914 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4919 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4926 ret
= write (fd
, writebuf
, (size_t) len
);
4928 ret
= read (fd
, readbuf
, (size_t) len
);
4935 /* Parse LINE as a signal set and add its set bits to SIGS. */
4938 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4940 int len
= strlen (line
) - 1;
4944 if (line
[len
] != '\n')
4945 error (_("Could not parse signal set: %s"), line
);
4953 if (*p
>= '0' && *p
<= '9')
4955 else if (*p
>= 'a' && *p
<= 'f')
4956 digit
= *p
- 'a' + 10;
4958 error (_("Could not parse signal set: %s"), line
);
4963 sigaddset (sigs
, signum
+ 1);
4965 sigaddset (sigs
, signum
+ 2);
4967 sigaddset (sigs
, signum
+ 3);
4969 sigaddset (sigs
, signum
+ 4);
4975 /* Find process PID's pending signals from /proc/pid/status and set
4979 linux_proc_pending_signals (int pid
, sigset_t
*pending
,
4980 sigset_t
*blocked
, sigset_t
*ignored
)
4983 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
4984 struct cleanup
*cleanup
;
4986 sigemptyset (pending
);
4987 sigemptyset (blocked
);
4988 sigemptyset (ignored
);
4989 sprintf (fname
, "/proc/%d/status", pid
);
4990 procfile
= fopen (fname
, "r");
4991 if (procfile
== NULL
)
4992 error (_("Could not open %s"), fname
);
4993 cleanup
= make_cleanup_fclose (procfile
);
4995 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
4997 /* Normal queued signals are on the SigPnd line in the status
4998 file. However, 2.6 kernels also have a "shared" pending
4999 queue for delivering signals to a thread group, so check for
5002 Unfortunately some Red Hat kernels include the shared pending
5003 queue but not the ShdPnd status field. */
5005 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
5006 add_line_to_sigset (buffer
+ 8, pending
);
5007 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
5008 add_line_to_sigset (buffer
+ 8, pending
);
5009 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
5010 add_line_to_sigset (buffer
+ 8, blocked
);
5011 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
5012 add_line_to_sigset (buffer
+ 8, ignored
);
5015 do_cleanups (cleanup
);
5019 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
5020 const char *annex
, gdb_byte
*readbuf
,
5021 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5023 /* We make the process list snapshot when the object starts to be
5025 static const char *buf
;
5026 static LONGEST len_avail
= -1;
5027 static struct obstack obstack
;
5031 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
5037 if (len_avail
!= -1 && len_avail
!= 0)
5038 obstack_free (&obstack
, NULL
);
5041 obstack_init (&obstack
);
5042 obstack_grow_str (&obstack
, "<osdata type=\"types\">\n");
5044 obstack_xml_printf (&obstack
,
5046 "<column name=\"Type\">processes</column>"
5047 "<column name=\"Description\">"
5048 "Listing of all processes</column>"
5051 obstack_grow_str0 (&obstack
, "</osdata>\n");
5052 buf
= obstack_finish (&obstack
);
5053 len_avail
= strlen (buf
);
5056 if (offset
>= len_avail
)
5058 /* Done. Get rid of the obstack. */
5059 obstack_free (&obstack
, NULL
);
5065 if (len
> len_avail
- offset
)
5066 len
= len_avail
- offset
;
5067 memcpy (readbuf
, buf
+ offset
, len
);
5072 if (strcmp (annex
, "processes") != 0)
5075 gdb_assert (readbuf
&& !writebuf
);
5079 if (len_avail
!= -1 && len_avail
!= 0)
5080 obstack_free (&obstack
, NULL
);
5083 obstack_init (&obstack
);
5084 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
5086 dirp
= opendir ("/proc");
5091 while ((dp
= readdir (dirp
)) != NULL
)
5093 struct stat statbuf
;
5094 char procentry
[sizeof ("/proc/4294967295")];
5096 if (!isdigit (dp
->d_name
[0])
5097 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
5100 sprintf (procentry
, "/proc/%s", dp
->d_name
);
5101 if (stat (procentry
, &statbuf
) == 0
5102 && S_ISDIR (statbuf
.st_mode
))
5106 char cmd
[MAXPATHLEN
+ 1];
5107 struct passwd
*entry
;
5109 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
5110 entry
= getpwuid (statbuf
.st_uid
);
5112 if ((f
= fopen (pathname
, "r")) != NULL
)
5114 size_t len
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
5120 for (i
= 0; i
< len
; i
++)
5125 obstack_xml_printf (
5128 "<column name=\"pid\">%s</column>"
5129 "<column name=\"user\">%s</column>"
5130 "<column name=\"command\">%s</column>"
5133 entry
? entry
->pw_name
: "?",
5146 obstack_grow_str0 (&obstack
, "</osdata>\n");
5147 buf
= obstack_finish (&obstack
);
5148 len_avail
= strlen (buf
);
5151 if (offset
>= len_avail
)
5153 /* Done. Get rid of the obstack. */
5154 obstack_free (&obstack
, NULL
);
5160 if (len
> len_avail
- offset
)
5161 len
= len_avail
- offset
;
5162 memcpy (readbuf
, buf
+ offset
, len
);
5168 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5169 const char *annex
, gdb_byte
*readbuf
,
5170 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5174 if (object
== TARGET_OBJECT_AUXV
)
5175 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5178 if (object
== TARGET_OBJECT_OSDATA
)
5179 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5182 if (object
== TARGET_OBJECT_SPU
)
5183 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5186 /* GDB calculates all the addresses in possibly larget width of the address.
5187 Address width needs to be masked before its final use - either by
5188 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5190 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5192 if (object
== TARGET_OBJECT_MEMORY
)
5194 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5196 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5197 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5200 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5205 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5209 /* Create a prototype generic GNU/Linux target. The client can override
5210 it with local methods. */
5213 linux_target_install_ops (struct target_ops
*t
)
5215 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5216 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5217 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5218 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5219 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5220 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5221 t
->to_post_attach
= linux_child_post_attach
;
5222 t
->to_follow_fork
= linux_child_follow_fork
;
5223 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5224 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5226 super_xfer_partial
= t
->to_xfer_partial
;
5227 t
->to_xfer_partial
= linux_xfer_partial
;
5233 struct target_ops
*t
;
5235 t
= inf_ptrace_target ();
5236 linux_target_install_ops (t
);
5242 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5244 struct target_ops
*t
;
5246 t
= inf_ptrace_trad_target (register_u_offset
);
5247 linux_target_install_ops (t
);
5252 /* target_is_async_p implementation. */
5255 linux_nat_is_async_p (void)
5257 /* NOTE: palves 2008-03-21: We're only async when the user requests
5258 it explicitly with the "set target-async" command.
5259 Someday, linux will always be async. */
5260 if (!target_async_permitted
)
5263 /* See target.h/target_async_mask. */
5264 return linux_nat_async_mask_value
;
5267 /* target_can_async_p implementation. */
5270 linux_nat_can_async_p (void)
5272 /* NOTE: palves 2008-03-21: We're only async when the user requests
5273 it explicitly with the "set target-async" command.
5274 Someday, linux will always be async. */
5275 if (!target_async_permitted
)
5278 /* See target.h/target_async_mask. */
5279 return linux_nat_async_mask_value
;
5283 linux_nat_supports_non_stop (void)
5288 /* True if we want to support multi-process. To be removed when GDB
5289 supports multi-exec. */
5291 int linux_multi_process
= 1;
5294 linux_nat_supports_multi_process (void)
5296 return linux_multi_process
;
5299 /* target_async_mask implementation. */
5302 linux_nat_async_mask (int new_mask
)
5304 int curr_mask
= linux_nat_async_mask_value
;
5306 if (curr_mask
!= new_mask
)
5310 linux_nat_async (NULL
, 0);
5311 linux_nat_async_mask_value
= new_mask
;
5315 linux_nat_async_mask_value
= new_mask
;
5317 /* If we're going out of async-mask in all-stop, then the
5318 inferior is stopped. The next resume will call
5319 target_async. In non-stop, the target event source
5320 should be always registered in the event loop. Do so
5323 linux_nat_async (inferior_event_handler
, 0);
5330 static int async_terminal_is_ours
= 1;
5332 /* target_terminal_inferior implementation. */
5335 linux_nat_terminal_inferior (void)
5337 if (!target_is_async_p ())
5339 /* Async mode is disabled. */
5340 terminal_inferior ();
5344 terminal_inferior ();
5346 /* Calls to target_terminal_*() are meant to be idempotent. */
5347 if (!async_terminal_is_ours
)
5350 delete_file_handler (input_fd
);
5351 async_terminal_is_ours
= 0;
5355 /* target_terminal_ours implementation. */
5358 linux_nat_terminal_ours (void)
5360 if (!target_is_async_p ())
5362 /* Async mode is disabled. */
5367 /* GDB should never give the terminal to the inferior if the
5368 inferior is running in the background (run&, continue&, etc.),
5369 but claiming it sure should. */
5372 if (async_terminal_is_ours
)
5375 clear_sigint_trap ();
5376 add_file_handler (input_fd
, stdin_event_handler
, 0);
5377 async_terminal_is_ours
= 1;
5380 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5382 static void *async_client_context
;
5384 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5385 so we notice when any child changes state, and notify the
5386 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5387 above to wait for the arrival of a SIGCHLD. */
5390 sigchld_handler (int signo
)
5392 int old_errno
= errno
;
5394 if (debug_linux_nat_async
)
5395 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5397 if (signo
== SIGCHLD
5398 && linux_nat_event_pipe
[0] != -1)
5399 async_file_mark (); /* Let the event loop know that there are
5400 events to handle. */
5405 /* Callback registered with the target events file descriptor. */
5408 handle_target_event (int error
, gdb_client_data client_data
)
5410 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5413 /* Create/destroy the target events pipe. Returns previous state. */
5416 linux_async_pipe (int enable
)
5418 int previous
= (linux_nat_event_pipe
[0] != -1);
5420 if (previous
!= enable
)
5424 block_child_signals (&prev_mask
);
5428 if (pipe (linux_nat_event_pipe
) == -1)
5429 internal_error (__FILE__
, __LINE__
,
5430 "creating event pipe failed.");
5432 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5433 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5437 close (linux_nat_event_pipe
[0]);
5438 close (linux_nat_event_pipe
[1]);
5439 linux_nat_event_pipe
[0] = -1;
5440 linux_nat_event_pipe
[1] = -1;
5443 restore_child_signals_mask (&prev_mask
);
5449 /* target_async implementation. */
5452 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5453 void *context
), void *context
)
5455 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5456 internal_error (__FILE__
, __LINE__
,
5457 "Calling target_async when async is masked");
5459 if (callback
!= NULL
)
5461 async_client_callback
= callback
;
5462 async_client_context
= context
;
5463 if (!linux_async_pipe (1))
5465 add_file_handler (linux_nat_event_pipe
[0],
5466 handle_target_event
, NULL
);
5467 /* There may be pending events to handle. Tell the event loop
5474 async_client_callback
= callback
;
5475 async_client_context
= context
;
5476 delete_file_handler (linux_nat_event_pipe
[0]);
5477 linux_async_pipe (0);
5482 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5486 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5490 ptid_t ptid
= lwp
->ptid
;
5492 if (debug_linux_nat
)
5493 fprintf_unfiltered (gdb_stdlog
,
5494 "LNSL: running -> suspending %s\n",
5495 target_pid_to_str (lwp
->ptid
));
5498 stop_callback (lwp
, NULL
);
5499 stop_wait_callback (lwp
, NULL
);
5501 /* If the lwp exits while we try to stop it, there's nothing
5503 lwp
= find_lwp_pid (ptid
);
5507 /* If we didn't collect any signal other than SIGSTOP while
5508 stopping the LWP, push a SIGNAL_0 event. In either case, the
5509 event-loop will end up calling target_wait which will collect
5511 if (lwp
->status
== 0)
5512 lwp
->status
= W_STOPCODE (0);
5517 /* Already known to be stopped; do nothing. */
5519 if (debug_linux_nat
)
5521 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5522 fprintf_unfiltered (gdb_stdlog
,
5523 "LNSL: already stopped/stop_requested %s\n",
5524 target_pid_to_str (lwp
->ptid
));
5526 fprintf_unfiltered (gdb_stdlog
,
5527 "LNSL: already stopped/no "
5528 "stop_requested yet %s\n",
5529 target_pid_to_str (lwp
->ptid
));
5536 linux_nat_stop (ptid_t ptid
)
5539 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5541 linux_ops
->to_stop (ptid
);
5545 linux_nat_close (int quitting
)
5547 /* Unregister from the event loop. */
5548 if (target_is_async_p ())
5549 target_async (NULL
, 0);
5551 /* Reset the async_masking. */
5552 linux_nat_async_mask_value
= 1;
5554 if (linux_ops
->to_close
)
5555 linux_ops
->to_close (quitting
);
5558 /* When requests are passed down from the linux-nat layer to the
5559 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5560 used. The address space pointer is stored in the inferior object,
5561 but the common code that is passed such ptid can't tell whether
5562 lwpid is a "main" process id or not (it assumes so). We reverse
5563 look up the "main" process id from the lwp here. */
5565 struct address_space
*
5566 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5568 struct lwp_info
*lwp
;
5569 struct inferior
*inf
;
5572 pid
= GET_LWP (ptid
);
5573 if (GET_LWP (ptid
) == 0)
5575 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5577 lwp
= find_lwp_pid (ptid
);
5578 pid
= GET_PID (lwp
->ptid
);
5582 /* A (pid,lwpid,0) ptid. */
5583 pid
= GET_PID (ptid
);
5586 inf
= find_inferior_pid (pid
);
5587 gdb_assert (inf
!= NULL
);
5592 linux_nat_core_of_thread_1 (ptid_t ptid
)
5594 struct cleanup
*back_to
;
5597 char *content
= NULL
;
5600 int content_read
= 0;
5604 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5605 GET_PID (ptid
), GET_LWP (ptid
));
5606 back_to
= make_cleanup (xfree
, filename
);
5608 f
= fopen (filename
, "r");
5611 do_cleanups (back_to
);
5615 make_cleanup_fclose (f
);
5621 content
= xrealloc (content
, content_read
+ 1024);
5622 n
= fread (content
+ content_read
, 1, 1024, f
);
5626 content
[content_read
] = '\0';
5631 make_cleanup (xfree
, content
);
5633 p
= strchr (content
, '(');
5637 p
= strchr (p
, ')');
5641 /* If the first field after program name has index 0, then core number is
5642 the field with index 36. There's no constant for that anywhere. */
5644 p
= strtok_r (p
, " ", &ts
);
5645 for (i
= 0; p
!= NULL
&& i
!= 36; ++i
)
5646 p
= strtok_r (NULL
, " ", &ts
);
5648 if (p
== NULL
|| sscanf (p
, "%d", &core
) == 0)
5651 do_cleanups (back_to
);
5656 /* Return the cached value of the processor core for thread PTID. */
5659 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5661 struct lwp_info
*info
= find_lwp_pid (ptid
);
5669 linux_nat_add_target (struct target_ops
*t
)
5671 /* Save the provided single-threaded target. We save this in a separate
5672 variable because another target we've inherited from (e.g. inf-ptrace)
5673 may have saved a pointer to T; we want to use it for the final
5674 process stratum target. */
5675 linux_ops_saved
= *t
;
5676 linux_ops
= &linux_ops_saved
;
5678 /* Override some methods for multithreading. */
5679 t
->to_create_inferior
= linux_nat_create_inferior
;
5680 t
->to_attach
= linux_nat_attach
;
5681 t
->to_detach
= linux_nat_detach
;
5682 t
->to_resume
= linux_nat_resume
;
5683 t
->to_wait
= linux_nat_wait
;
5684 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5685 t
->to_kill
= linux_nat_kill
;
5686 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5687 t
->to_thread_alive
= linux_nat_thread_alive
;
5688 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5689 t
->to_has_thread_control
= tc_schedlock
;
5690 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5691 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5692 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5694 t
->to_can_async_p
= linux_nat_can_async_p
;
5695 t
->to_is_async_p
= linux_nat_is_async_p
;
5696 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5697 t
->to_async
= linux_nat_async
;
5698 t
->to_async_mask
= linux_nat_async_mask
;
5699 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5700 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5701 t
->to_close
= linux_nat_close
;
5703 /* Methods for non-stop support. */
5704 t
->to_stop
= linux_nat_stop
;
5706 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5708 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5710 /* We don't change the stratum; this target will sit at
5711 process_stratum and thread_db will set at thread_stratum. This
5712 is a little strange, since this is a multi-threaded-capable
5713 target, but we want to be on the stack below thread_db, and we
5714 also want to be used for single-threaded processes. */
5719 /* Register a method to call whenever a new thread is attached. */
5721 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5723 /* Save the pointer. We only support a single registered instance
5724 of the GNU/Linux native target, so we do not need to map this to
5726 linux_nat_new_thread
= new_thread
;
5729 /* Register a method that converts a siginfo object between the layout
5730 that ptrace returns, and the layout in the architecture of the
5733 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5734 int (*siginfo_fixup
) (struct siginfo
*,
5738 /* Save the pointer. */
5739 linux_nat_siginfo_fixup
= siginfo_fixup
;
5742 /* Return the saved siginfo associated with PTID. */
5744 linux_nat_get_siginfo (ptid_t ptid
)
5746 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5748 gdb_assert (lp
!= NULL
);
5750 return &lp
->siginfo
;
5753 /* Provide a prototype to silence -Wmissing-prototypes. */
5754 extern initialize_file_ftype _initialize_linux_nat
;
5757 _initialize_linux_nat (void)
5759 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5760 Show /proc process information about any running process.\n\
5761 Specify any process id, or use the program being debugged by default.\n\
5762 Specify any of the following keywords for detailed info:\n\
5763 mappings -- list of mapped memory regions.\n\
5764 stat -- list a bunch of random process info.\n\
5765 status -- list a different bunch of random process info.\n\
5766 all -- list all available /proc info."));
5768 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5769 &debug_linux_nat
, _("\
5770 Set debugging of GNU/Linux lwp module."), _("\
5771 Show debugging of GNU/Linux lwp module."), _("\
5772 Enables printf debugging output."),
5774 show_debug_linux_nat
,
5775 &setdebuglist
, &showdebuglist
);
5777 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5778 &debug_linux_nat_async
, _("\
5779 Set debugging of GNU/Linux async lwp module."), _("\
5780 Show debugging of GNU/Linux async lwp module."), _("\
5781 Enables printf debugging output."),
5783 show_debug_linux_nat_async
,
5784 &setdebuglist
, &showdebuglist
);
5786 /* Save this mask as the default. */
5787 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5789 /* Install a SIGCHLD handler. */
5790 sigchld_action
.sa_handler
= sigchld_handler
;
5791 sigemptyset (&sigchld_action
.sa_mask
);
5792 sigchld_action
.sa_flags
= SA_RESTART
;
5794 /* Make it the default. */
5795 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5797 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5798 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5799 sigdelset (&suspend_mask
, SIGCHLD
);
5801 sigemptyset (&blocked_mask
);
5803 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5804 &disable_randomization
, _("\
5805 Set disabling of debuggee's virtual address space randomization."), _("\
5806 Show disabling of debuggee's virtual address space randomization."), _("\
5807 When this mode is on (which is the default), randomization of the virtual\n\
5808 address space is disabled. Standalone programs run with the randomization\n\
5809 enabled by default on some platforms."),
5810 &set_disable_randomization
,
5811 &show_disable_randomization
,
5812 &setlist
, &showlist
);
5816 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5817 the GNU/Linux Threads library and therefore doesn't really belong
5820 /* Read variable NAME in the target and return its value if found.
5821 Otherwise return zero. It is assumed that the type of the variable
5825 get_signo (const char *name
)
5827 struct minimal_symbol
*ms
;
5830 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5834 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5835 sizeof (signo
)) != 0)
5841 /* Return the set of signals used by the threads library in *SET. */
5844 lin_thread_get_thread_signals (sigset_t
*set
)
5846 struct sigaction action
;
5847 int restart
, cancel
;
5849 sigemptyset (&blocked_mask
);
5852 restart
= get_signo ("__pthread_sig_restart");
5853 cancel
= get_signo ("__pthread_sig_cancel");
5855 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5856 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5857 not provide any way for the debugger to query the signal numbers -
5858 fortunately they don't change! */
5861 restart
= __SIGRTMIN
;
5864 cancel
= __SIGRTMIN
+ 1;
5866 sigaddset (set
, restart
);
5867 sigaddset (set
, cancel
);
5869 /* The GNU/Linux Threads library makes terminating threads send a
5870 special "cancel" signal instead of SIGCHLD. Make sure we catch
5871 those (to prevent them from terminating GDB itself, which is
5872 likely to be their default action) and treat them the same way as
5875 action
.sa_handler
= sigchld_handler
;
5876 sigemptyset (&action
.sa_mask
);
5877 action
.sa_flags
= SA_RESTART
;
5878 sigaction (cancel
, &action
, NULL
);
5880 /* We block the "cancel" signal throughout this code ... */
5881 sigaddset (&blocked_mask
, cancel
);
5882 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5884 /* ... except during a sigsuspend. */
5885 sigdelset (&suspend_mask
, cancel
);