1 /* Copyright (C) 1991, 1992, 1996, 1997, 2005 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <string.h> /* For the real memset prototype. */
23 libc_hidden_proto(sigaction)
25 /* Tolerate non-threads versions of Posix */
33 #define SA_INTERRUPT 0
36 /* Set the handler for the signal SIG to HANDLER,
37 returning the old handler, or SIG_ERR on error. */
39 __sysv_signal (sig, handler)
41 __sighandler_t handler;
43 struct sigaction act, oact;
45 /* Check signal extents to protect __sigismember. */
46 if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
52 act.sa_handler = handler;
53 if (__sigemptyset (&act.sa_mask) < 0)
55 act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT;
56 act.sa_flags &= ~SA_RESTART;
57 if (sigaction (sig, &act, &oact) < 0)
60 return oact.sa_handler;
62 strong_alias(__sysv_signal,sysv_signal)