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tmux 2.4

    1: /* $OpenBSD$ */
    2: 
    3: /*
    4:  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
    5:  * Copyright (c) 2010 Romain Francoise <rfrancoise@debian.org>
    6:  *
    7:  * Permission to use, copy, modify, and distribute this software for any
    8:  * purpose with or without fee is hereby granted, provided that the above
    9:  * copyright notice and this permission notice appear in all copies.
   10:  *
   11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
   16:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
   17:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18:  */
   19: 
   20: #include <sys/types.h>
   21: 
   22: #include <string.h>
   23: #include <signal.h>
   24: 
   25: #include "tmux.h"
   26: 
   27: static struct event	ev_sighup;
   28: static struct event	ev_sigchld;
   29: static struct event	ev_sigcont;
   30: static struct event	ev_sigterm;
   31: static struct event	ev_sigusr1;
   32: static struct event	ev_sigwinch;
   33: 
   34: void
   35: set_signals(void (*handler)(int, short, void *), void *arg)
   36: {
   37: 	struct sigaction	sigact;
   38: 
   39: 	memset(&sigact, 0, sizeof sigact);
   40: 	sigemptyset(&sigact.sa_mask);
   41: 	sigact.sa_flags = SA_RESTART;
   42: 	sigact.sa_handler = SIG_IGN;
   43: 	if (sigaction(SIGINT, &sigact, NULL) != 0)
   44: 		fatal("sigaction failed");
   45: 	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
   46: 		fatal("sigaction failed");
   47: 	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
   48: 		fatal("sigaction failed");
   49: 	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
   50: 		fatal("sigaction failed");
   51: 
   52: 	signal_set(&ev_sighup, SIGHUP, handler, arg);
   53: 	signal_add(&ev_sighup, NULL);
   54: 	signal_set(&ev_sigchld, SIGCHLD, handler, arg);
   55: 	signal_add(&ev_sigchld, NULL);
   56: 	signal_set(&ev_sigcont, SIGCONT, handler, arg);
   57: 	signal_add(&ev_sigcont, NULL);
   58: 	signal_set(&ev_sigterm, SIGTERM, handler, arg);
   59: 	signal_add(&ev_sigterm, NULL);
   60: 	signal_set(&ev_sigusr1, SIGUSR1, handler, arg);
   61: 	signal_add(&ev_sigusr1, NULL);
   62: 	signal_set(&ev_sigwinch, SIGWINCH, handler, arg);
   63: 	signal_add(&ev_sigwinch, NULL);
   64: }
   65: 
   66: void
   67: clear_signals(int after_fork)
   68: {
   69: 	struct sigaction	sigact;
   70: 
   71: 	memset(&sigact, 0, sizeof sigact);
   72: 	sigemptyset(&sigact.sa_mask);
   73: 	sigact.sa_flags = SA_RESTART;
   74: 	sigact.sa_handler = SIG_DFL;
   75: 	if (sigaction(SIGINT, &sigact, NULL) != 0)
   76: 		fatal("sigaction failed");
   77: 	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
   78: 		fatal("sigaction failed");
   79: 	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
   80: 		fatal("sigaction failed");
   81: 	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
   82: 		fatal("sigaction failed");
   83: 
   84: 	if (after_fork) {
   85: 		if (sigaction(SIGHUP, &sigact, NULL) != 0)
   86: 			fatal("sigaction failed");
   87: 		if (sigaction(SIGCHLD, &sigact, NULL) != 0)
   88: 			fatal("sigaction failed");
   89: 		if (sigaction(SIGCONT, &sigact, NULL) != 0)
   90: 			fatal("sigaction failed");
   91: 		if (sigaction(SIGTERM, &sigact, NULL) != 0)
   92: 			fatal("sigaction failed");
   93: 		if (sigaction(SIGUSR1, &sigact, NULL) != 0)
   94: 			fatal("sigaction failed");
   95: 		if (sigaction(SIGWINCH, &sigact, NULL) != 0)
   96: 			fatal("sigaction failed");
   97: 	} else {
   98: 		event_del(&ev_sighup);
   99: 		event_del(&ev_sigchld);
  100: 		event_del(&ev_sigcont);
  101: 		event_del(&ev_sigterm);
  102: 		event_del(&ev_sigusr1);
  103: 		event_del(&ev_sigwinch);
  104: 	}
  105: }