107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/* $calcurse: sigs.c,v 1.11 2010/03/20 10:54:48 culot Exp $ */
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/*
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* Calcurse - text-based organizer
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*
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* Copyright (c) 2007-2010 Frederic Culot <frederic@culot.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Send your feedback or comments to : calcurse@culot.org
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* Calcurse home page : http://culot.org/calcurse
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*
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include "calcurse.h"
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/*
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* General signal handling routine.
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* Catch return values from children (user-defined notification commands).
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* This is needed to avoid zombie processes running on system.
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* Also catch CTRL-C (SIGINT), and SIGWINCH to resize screen automatically.
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*/
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static void
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generic_hdlr (int sig)
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{
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switch (sig)
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{
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case SIGCHLD:
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while (waitpid (WAIT_MYPGRP, NULL, WNOHANG) > 0)
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;
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break;
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case SIGWINCH:
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clearok (curscr, TRUE);
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(void)ungetch (KEY_RESIZE);
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break;
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case SIGTERM:
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if (unlink (path_cpid) != 0)
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{
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EXIT (_("Could not remove calcurse lock file: %s\n"),
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strerror (errno));
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}
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exit (EXIT_SUCCESS);
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break;
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}
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}
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unsigned
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sigs_set_hdlr (int sig, void (*handler)(int))
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{
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struct sigaction sa;
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memset (&sa, 0, sizeof sa);
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sigemptyset (&sa.sa_mask);
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sa.sa_handler = handler;
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sa.sa_flags = 0;
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if (sigaction (sig, &sa, (struct sigaction *)0) == -1)
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{
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ERROR_MSG (_("Error setting signal #%d : %s\n"),
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sig, strerror (errno));
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return 0;
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}
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return 1;
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}
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/* Signal handling init. */
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void
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sigs_init ()
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{
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if (!sigs_set_hdlr (SIGCHLD, generic_hdlr)
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|| !sigs_set_hdlr (SIGWINCH, generic_hdlr)
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|| !sigs_set_hdlr (SIGTERM, generic_hdlr)
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|| !sigs_set_hdlr (SIGINT, SIG_IGN))
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exit_calcurse (1);
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}
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