| /* BSD-like signal function. |
| Copyright (C) 1991-2016 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 attribute_hidden; /* Set by siginterrupt. */ |
| |
| /* Set the handler for the signal SIG to HANDLER, |
| returning the old handler, or SIG_ERR on error. */ |
| __sighandler_t |
| __bsd_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; |
| if (__sigemptyset (&act.sa_mask) < 0 |
| || __sigaddset (&act.sa_mask, sig) < 0) |
| return SIG_ERR; |
| act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART; |
| if (__sigaction (sig, &act, &oact) < 0) |
| return SIG_ERR; |
| |
| return oact.sa_handler; |
| } |
| weak_alias (__bsd_signal, bsd_signal) |
| weak_alias (__bsd_signal, signal) |
| weak_alias (__bsd_signal, ssignal) |