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Annotation of embedaddon/tmux/signal.c, revision 1.1

1.1     ! misho       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: }