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
|
/* Copyright (C) 1991, 1992, 1996, 1997, 2005 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
/* Tolerate non-threads versions of Posix */
#ifndef SA_ONESHOT
#define SA_ONESHOT 0
#endif
#ifndef SA_NOMASK
#define SA_NOMASK 0
#endif
#ifndef SA_INTERRUPT
#define SA_INTERRUPT 0
#endif
/* Set the handler for the signal SIG to HANDLER,
returning the old handler, or SIG_ERR on error. */
__sighandler_t __sysv_signal (int sig, __sighandler_t handler)
{
struct sigaction act, oact;
/* Check signal extents to protect __sigismember. */
if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
{
__set_errno (EINVAL);
return SIG_ERR;
}
act.sa_handler = handler;
__sigemptyset (&act.sa_mask);
act.sa_flags = (SA_ONESHOT | SA_NOMASK | SA_INTERRUPT) & ~SA_RESTART;
/* In Linux (as of 2.6.25), fails only if sig is SIGKILL or SIGSTOP */
if (sigaction (sig, &act, &oact) < 0)
return SIG_ERR;
return oact.sa_handler;
}
strong_alias(__sysv_signal,sysv_signal)
|
