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/*
* libmowgli: A collection of useful routines for programming.
* mowgli_signal.c: Safe signal handling.
*
* Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _WIN32
#include <signal.h>
#include "mowgli.h"
#if defined(__linux__) && defined(__GNUC__) && defined(__STRICT_ANSI__)
# error GCC/Linux in -std=c99 mode will not compile mowgli_signal; use -std=gnu99 instead
#endif
static mowgli_signal_handler_t
mowgli_signal_install_handler_full(int signum, mowgli_signal_handler_t handler, int *sigtoblock, size_t sigtoblocksize)
{
struct sigaction action, old_action;
size_t i;
action.sa_handler = handler;
action.sa_flags = SA_RESTART;
sigemptyset(&action.sa_mask);
for (i = 0; i < sigtoblocksize; i++)
sigaddset(&action.sa_mask, sigtoblock[i]);
if (sigaction(signum, &action, &old_action) == -1)
{
mowgli_log("Failed to install signal handler for signal %d", signum);
return NULL;
}
return old_action.sa_handler;
}
/*
* A version of signal(2) that works more reliably across different
* platforms.
*
* It restarts interrupted system calls, does not reset the handler,
* and blocks the same signal from within the handler.
*/
mowgli_signal_handler_t
mowgli_signal_install_handler(int signum, mowgli_signal_handler_t handler)
{
return mowgli_signal_install_handler_full(signum, handler, NULL, 0);
}
#endif
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