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
22 /* Tolerate non-threads versions of Posix */
30 #define SA_INTERRUPT 0
33 /* Set the handler for the signal SIG to HANDLER,
34 returning the old handler, or SIG_ERR on error. */
35 __sighandler_t __sysv_signal (int sig, __sighandler_t handler)
37 struct sigaction act, oact;
39 /* Check signal extents to protect __sigismember. */
40 if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
46 act.sa_handler = handler;
47 __sigemptyset (&act.sa_mask);
48 act.sa_flags = (SA_ONESHOT | SA_NOMASK | SA_INTERRUPT) & ~SA_RESTART;
49 /* In Linux (as of 2.6.25), fails only if sig is SIGKILL or SIGSTOP */
50 if (sigaction (sig, &act, &oact) < 0)
53 return oact.sa_handler;
55 strong_alias(__sysv_signal,sysv_signal)