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/* $OpenBSD: signal.c,v 1.10 2016/10/10 21:29:23 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
* Copyright (c) 2010 Romain Francoise <rfrancoise@debian.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <string.h>
#include <signal.h>
#include "tmux.h"
static struct event ev_sighup;
static struct event ev_sigchld;
static struct event ev_sigcont;
static struct event ev_sigterm;
static struct event ev_sigusr1;
static struct event ev_sigwinch;
void
set_signals(void (*handler)(int, short, void *), void *arg)
{
struct sigaction sigact;
memset(&sigact, 0, sizeof sigact);
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigact.sa_handler = SIG_IGN;
if (sigaction(SIGINT, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGPIPE, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
fatal("sigaction failed");
signal_set(&ev_sighup, SIGHUP, handler, arg);
signal_add(&ev_sighup, NULL);
signal_set(&ev_sigchld, SIGCHLD, handler, arg);
signal_add(&ev_sigchld, NULL);
signal_set(&ev_sigcont, SIGCONT, handler, arg);
signal_add(&ev_sigcont, NULL);
signal_set(&ev_sigterm, SIGTERM, handler, arg);
signal_add(&ev_sigterm, NULL);
signal_set(&ev_sigusr1, SIGUSR1, handler, arg);
signal_add(&ev_sigusr1, NULL);
signal_set(&ev_sigwinch, SIGWINCH, handler, arg);
signal_add(&ev_sigwinch, NULL);
}
void
clear_signals(int after_fork)
{
struct sigaction sigact;
memset(&sigact, 0, sizeof sigact);
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigact.sa_handler = SIG_DFL;
if (sigaction(SIGINT, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGPIPE, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
fatal("sigaction failed");
if (after_fork) {
if (sigaction(SIGHUP, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCHLD, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCONT, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTERM, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR1, &sigact, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGWINCH, &sigact, NULL) != 0)
fatal("sigaction failed");
} else {
event_del(&ev_sighup);
event_del(&ev_sigchld);
event_del(&ev_sigcont);
event_del(&ev_sigterm);
event_del(&ev_sigusr1);
event_del(&ev_sigwinch);
}
}
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