f743eab5ac
The purpose is to make child_wait() reliable. The handler is meant for the notify main thread, but signal handlers are shared by all threads. In the calcurse main thread and the periodic save thread (hooks) the handler and child_wait() will compete (if the signal handler kicks in first, the waitpid() call in child_wait() will fail with errno ECHILD). All child processes in the main thread, the notify thread, the periodic save thread and the notify demon are explicitly waited for. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
|
|
* Calcurse - text-based organizer
|
|
*
|
|
* Copyright (c) 2004-2020 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 SIGWINCH to resize screen automatically.
|
|
*/
|
|
static void generic_hdlr(int sig)
|
|
{
|
|
switch (sig) {
|
|
case SIGWINCH:
|
|
resize = 1;
|
|
clearok(curscr, TRUE);
|
|
ungetch(KEY_RESIZE);
|
|
break;
|
|
case SIGTERM:
|
|
exit_calcurse(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(SIGWINCH, generic_hdlr)
|
|
|| !sigs_set_hdlr(SIGTERM, generic_hdlr)
|
|
|| !sigs_set_hdlr(SIGUSR1, generic_hdlr)
|
|
|| !sigs_set_hdlr(SIGINT, SIG_IGN))
|
|
exit_calcurse(EXIT_FAILURE);
|
|
}
|
|
|
|
/* 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);
|
|
}
|