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/*
* Calcurse - text-based organizer
*
* Copyright (c) 2004-2017 calcurse Development Team <misc@calcurse.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 : misc@calcurse.org
* Calcurse home page : http://calcurse.org
*
*/
#ifndef _BSD_SOURCE
/* Needed for SIGWINCH on OpenBSD. */
#define _BSD_SOURCE
/* Silence compiler warning about _BSD_SOURCE being deprecated. */
#ifndef _DEFAULT_SOURCE
#define _DEFAULT_SOURCE
#endif
#endif
#ifndef __BSD_VISIBLE
/* Needed for SIGWINCH on FreeBSD. */
#define __BSD_VISIBLE 1
#endif
#ifndef _DARWIN_C_SOURCE
/* Needed for SIGWINCH on Darwin. */
#define _DARWIN_C_SOURCE 1
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "calcurse.h"
#ifndef WAIT_MYPGRP
#define WAIT_MYPGRP 0
#endif
/*
* 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:
resize = 1;
clearok(curscr, TRUE);
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;
case SIGUSR1:
want_reload = 1;
ungetch(KEY_RESIZE);
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, NULL) == -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(SIGUSR1, generic_hdlr)
|| !sigs_set_hdlr(SIGINT, SIG_IGN))
exit_calcurse(1);
}
/* Ignore SIGWINCH and SIGTERM signals. */
void sigs_ignore(void)
{
sigs_set_hdlr(SIGWINCH, SIG_IGN);
sigs_set_hdlr(SIGTERM, SIG_IGN);
}
/* No longer ignore SIGWINCH and SIGTERM signals. */
void sigs_unignore(void)
{
sigs_set_hdlr(SIGWINCH, generic_hdlr);
sigs_set_hdlr(SIGTERM, generic_hdlr);
}
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