signal.c

   1 /* $Id$ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
   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 <string.h>
  21 #include <signal.h>
  22
  23 #include "tmux.h"
  24
  25 struct event    ev_sigchld;
  26 struct event    ev_sigcont;
  27 struct event    ev_sigterm;
  28 struct event    ev_sigusr1;
  29 struct event    ev_sigwinch;
  30
  31 void
  32 set_signals(void(*handler)(int, short, unused void *))
  33 {
  34         struct sigaction        sigact;
  35
  36         memset(&sigact, 0, sizeof sigact);
  37         sigemptyset(&sigact.sa_mask);
  38         sigact.sa_flags = SA_RESTART;
  39         sigact.sa_handler = SIG_IGN;
  40         if (sigaction(SIGINT, &sigact, NULL) != 0)
  41                 fatal("sigaction failed");
  42         if (sigaction(SIGPIPE, &sigact, NULL) != 0)
  43                 fatal("sigaction failed");
  44         if (sigaction(SIGUSR2, &sigact, NULL) != 0)
  45                 fatal("sigaction failed");
  46         if (sigaction(SIGTSTP, &sigact, NULL) != 0)
  47                 fatal("sigaction failed");
  48         if (sigaction(SIGHUP, &sigact, NULL) != 0)
  49                 fatal("sigaction failed");
  50
  51         signal_set(&ev_sigchld, SIGCHLD, handler, NULL);
  52         signal_add(&ev_sigchld, NULL);
  53         signal_set(&ev_sigcont, SIGCONT, handler, NULL);
  54         signal_add(&ev_sigcont, NULL);
  55         signal_set(&ev_sigterm, SIGTERM, handler, NULL);
  56         signal_add(&ev_sigterm, NULL);
  57         signal_set(&ev_sigusr1, SIGUSR1, handler, NULL);
  58         signal_add(&ev_sigusr1, NULL);
  59         signal_set(&ev_sigwinch, SIGWINCH, handler, NULL);
  60         signal_add(&ev_sigwinch, NULL);
  61 }
  62
  63 void
  64 clear_signals(void)
  65 {
  66         struct sigaction        sigact;
  67
  68         memset(&sigact, 0, sizeof sigact);
  69         sigemptyset(&sigact.sa_mask);
  70         sigact.sa_flags = SA_RESTART;
  71         sigact.sa_handler = SIG_DFL;
  72         if (sigaction(SIGINT, &sigact, NULL) != 0)
  73                 fatal("sigaction failed");
  74         if (sigaction(SIGPIPE, &sigact, NULL) != 0)
  75                 fatal("sigaction failed");
  76         if (sigaction(SIGUSR2, &sigact, NULL) != 0)
  77                 fatal("sigaction failed");
  78         if (sigaction(SIGTSTP, &sigact, NULL) != 0)
  79                 fatal("sigaction failed");
  80         if (sigaction(SIGHUP, &sigact, NULL) != 0)
  81                 fatal("sigaction failed");
  82
  83         event_del(&ev_sigchld);
  84         event_del(&ev_sigcont);
  85         event_del(&ev_sigterm);
  86         event_del(&ev_sigusr1);
  87         event_del(&ev_sigwinch);
  88 }