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
|
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
<http://www.gnu.org/licenses/>. */
#include <signal.h>
#include <sysdep.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <nptl-signals.h>
int
raise (int sig)
{
/* raise is an async-safe function so it could be called while the
fork/vfork function temporarily invalidated the PID field. To avoid
relying on cached value we block all user-defined signal handler
(which might call fork/vfork) and issue the getpid and gettid
syscalls directly. */
/* rt_sigprocmask may fail if:
1. sigsetsize != sizeof (sigset_t) (EINVAL)
2. a failure in copy from/to user space (EFAULT)
3. an invalid 'how' operation (EINVAL)
The first case is already handle in glibc syscall call by using the arch
defined _NSIG. Second case is handled by using a stack allocated mask.
The last one should be handled by the block/unblock functions. */
sigset_t set;
__libc_signal_block_app (&set);
INTERNAL_SYSCALL_DECL (err);
pid_t pid = INTERNAL_SYSCALL (getpid, err, 0);
pid_t tid = INTERNAL_SYSCALL (gettid, err, 0);
int ret = INLINE_SYSCALL (tgkill, 3, pid, tid, sig);
__libc_signal_restore_set (&set);
return ret;
}
libc_hidden_def (raise)
weak_alias (raise, gsignal)
|
