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sourceware.org Git - glibc.git/blob - sysdeps/posix/sysv_signal.c
1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
20 #include <string.h> /* For the real memset prototype. */
23 /* Tolerate non-threads versions of Posix */
31 #define SA_INTERRUPT 0
34 /* Set the handler for the signal SIG to HANDLER,
35 returning the old handler, or SIG_ERR on error. */
37 __sysv_signal (int sig
, __sighandler_t handler
)
39 struct sigaction act
, oact
;
41 /* Check signal extents to protect __sigismember. */
42 if (handler
== SIG_ERR
|| sig
< 1 || sig
>= NSIG
)
48 act
.sa_handler
= handler
;
49 if (__sigemptyset (&act
.sa_mask
) < 0)
51 act
.sa_flags
= SA_ONESHOT
| SA_NOMASK
| SA_INTERRUPT
;
52 act
.sa_flags
&= ~SA_RESTART
;
53 if (__sigaction (sig
, &act
, &oact
) < 0)
56 return oact
.sa_handler
;
59 weak_alias (__sysv_signal
, sysv_signal
)
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