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beed38b827
This patch enhances GDB on GNU/Linux systems in the situation where
we are debugging an inferior that was created from GDB (as opposed
to attached to), by asking the kernel to kill the inferior if GDB
terminates without doing it itself.
This would typically happen when GDB encounters a problem and
crashes, or when it gets killed by an external process. This can
be observed by starting a program under GDB, and then killing
GDB with signal 9. After GDB is killed, the inferior still remains.
This patch also fixes GDBserver similarly.
This fix is conditional on the kernel supporting the PTRACE_O_EXITKILL
feature. On older kernels, the behavior remains unchanged.
gdb/ChangeLog:
* nat/linux-ptrace.h (PTRACE_O_EXITKILL): Define if not
already defined.
(linux_enable_event_reporting): Add parameter "attached".
* nat/linux-ptrace.c (linux_test_for_exitkill): New forward
declaration. New function.
(linux_check_ptrace_features): Add linux_test_for_exitkill call.
(linux_enable_event_reporting): Add new parameter "attached".
Do not call ptrace with the PTRACE_O_EXITKILL if ATTACHED is
nonzero.
* linux-nat.c (linux_init_ptrace): Add parameter "attached".
Use it. Update function description.
(linux_child_post_attach, linux_child_post_startup_inferior):
Update call to linux_enable_event_reporting.
gdb/gdbserver/ChangeLog:
* linux-low.c (linux_low_filter_event): Update call to
linux_enable_event_reporting following the addition of
a new parameter to that function.
Tested on x86_64-linux, native and native-gdbserver.
I also verified by hand that the inferior gets killed when killing
GDB in the "run" case, while the inferior remains in the "attach"
case. Same for GDBserver.
104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/* Copyright (C) 2011-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_LINUX_PTRACE_H
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#define COMMON_LINUX_PTRACE_H
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struct buffer;
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#include <sys/ptrace.h>
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#ifdef __UCLIBC__
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#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
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/* PTRACE_TEXT_ADDR and friends. */
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#include <asm/ptrace.h>
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#define HAS_NOMMU
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#endif
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#endif
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#if !defined(PTRACE_TYPE_ARG3)
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#define PTRACE_TYPE_ARG3 void *
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#endif
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#if !defined(PTRACE_TYPE_ARG4)
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#define PTRACE_TYPE_ARG4 void *
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#endif
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#ifndef PTRACE_GETSIGINFO
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# define PTRACE_GETSIGINFO 0x4202
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# define PTRACE_SETSIGINFO 0x4203
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#endif /* PTRACE_GETSIGINF */
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/* If the system headers did not provide the constants, hard-code the normal
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values. */
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#ifndef PTRACE_EVENT_FORK
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_GETEVENTMSG 0x4201
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/* options set using PTRACE_SETOPTIONS */
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#define PTRACE_O_TRACESYSGOOD 0x00000001
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#define PTRACE_O_TRACEFORK 0x00000002
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#define PTRACE_O_TRACEVFORK 0x00000004
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#define PTRACE_O_TRACECLONE 0x00000008
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#define PTRACE_O_TRACEEXEC 0x00000010
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#define PTRACE_O_TRACEVFORKDONE 0x00000020
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#define PTRACE_O_TRACEEXIT 0x00000040
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/* Wait extended result codes for the above trace options. */
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_EXEC 4
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#define PTRACE_EVENT_VFORK_DONE 5
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#define PTRACE_EVENT_EXIT 6
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#endif /* PTRACE_EVENT_FORK */
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#ifndef PTRACE_O_EXITKILL
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/* Only defined in Linux Kernel 3.8 or later. */
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#define PTRACE_O_EXITKILL 0x00100000
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#endif
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#if (defined __bfin__ || defined __frv__ || defined __sh__) \
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&& !defined PTRACE_GETFDPIC
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#define PTRACE_GETFDPIC 31
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#define PTRACE_GETFDPIC_EXEC 0
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#define PTRACE_GETFDPIC_INTERP 1
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#endif
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/* We can't always assume that this flag is available, but all systems
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with the ptrace event handlers also have __WALL, so it's safe to use
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in some contexts. */
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#ifndef __WALL
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#define __WALL 0x40000000 /* Wait for any child. */
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#endif
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extern void linux_ptrace_attach_fail_reason (pid_t pid, struct buffer *buffer);
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extern void linux_ptrace_init_warnings (void);
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extern void linux_enable_event_reporting (pid_t pid, int attached);
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extern void linux_disable_event_reporting (pid_t pid);
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extern int linux_supports_tracefork (void);
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extern int linux_supports_traceclone (void);
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extern int linux_supports_tracevforkdone (void);
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extern int linux_supports_tracesysgood (void);
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extern void linux_ptrace_set_additional_flags (int);
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extern int linux_ptrace_get_extended_event (int wstat);
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extern int linux_is_extended_waitstatus (int wstat);
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#endif /* COMMON_LINUX_PTRACE_H */
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