1 /* BSD-like signal function.
2 Copyright (C) 1991-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
21 #include <string.h> /* For the real memset prototype. */
24 sigset_t _sigintr attribute_hidden
; /* Set by siginterrupt. */
26 /* Set the handler for the signal SIG to HANDLER,
27 returning the old handler, or SIG_ERR on error. */
29 __bsd_signal (int sig
, __sighandler_t handler
)
31 struct sigaction act
, oact
;
33 /* Check signal extents to protect __sigismember. */
34 if (handler
== SIG_ERR
|| sig
< 1 || sig
>= NSIG
)
40 act
.sa_handler
= handler
;
41 if (__sigemptyset (&act
.sa_mask
) < 0
42 || __sigaddset (&act
.sa_mask
, sig
) < 0)
44 act
.sa_flags
= __sigismember (&_sigintr
, sig
) ? 0 : SA_RESTART
;
45 if (__sigaction (sig
, &act
, &oact
) < 0)
48 return oact
.sa_handler
;
50 weak_alias (__bsd_signal
, bsd_signal
)
51 weak_alias (__bsd_signal
, signal
)
52 weak_alias (__bsd_signal
, ssignal
)