/* BSD-like signal function. Copyright (C) 1991,1992,1996,1997,2000,2002,2005 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> #include <string.h> /* For the real memset prototype. */ sigset_t _sigintr; /* Set by siginterrupt. */ /* Set the handler for the signal SIG to HANDLER, returning the old handler, or SIG_ERR on error. */ __sighandler_t 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); __sigaddset (&act.sa_mask, sig); act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : 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; } libc_hidden_def(signal) #ifdef __UCLIBC_SUSV3_LEGACY__ strong_alias(signal,bsd_signal) #endif