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