1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <signal.h>
#include <internal-signals.h>
#include <libc-lock.h>
#include <pthreadP.h>
#include <unistd.h>
/* Try to get a machine dependent instruction which will make the
program crash. This is used in case everything else fails. */
#include <abort-instr.h>
#ifndef ABORT_INSTRUCTION
/* No such instruction is available. */
# define ABORT_INSTRUCTION
#endif
/* Exported variable to locate abort message in core files etc. */
struct abort_msg_s *__abort_msg;
libc_hidden_def (__abort_msg)
/* The lock is used to prevent multiple thread to change the SIGABRT
to SIG_IGN while abort tries to change to SIG_DFL, and to avoid
a new process to see a wrong disposition if there is a SIGABRT
handler installed. */
__libc_lock_define_initialized (static, lock);
void
__abort_fork_reset_child (void)
{
__libc_lock_init (lock);
}
void
__abort_lock_lock (internal_sigset_t *set)
{
internal_signal_block_all (set);
__libc_lock_lock (lock);
}
void
__abort_lock_unlock (const internal_sigset_t *set)
{
__libc_lock_unlock (lock);
internal_signal_restore_set (set);
}
/* Cause an abnormal program termination with core-dump. */
_Noreturn void
abort (void)
{
raise (SIGABRT);
/* There is a SIGABRT handler installed and it returned, or SIGABRT was
blocked or ignored. In this case use a AS-safe lock to prevent sigaction
to change the signal dispositioni (it will block on __abort_lock),
reinstall the handle to abort the process, and re-raise the signal. */
__abort_lock_lock (NULL);
struct sigaction act = {.sa_handler = SIG_DFL, .sa_flags = 0 };
__sigfillset (&act.sa_mask);
__libc_sigaction (SIGABRT, &act, NULL);
__pthread_raise_internal (SIGABRT);
internal_signal_unblock_signal (SIGABRT);
/* This code should be unreachable, try the arch-specific code and the
syscall fallback. */
ABORT_INSTRUCTION;
_exit (127);
}
libc_hidden_def (abort)
|
