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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* (c) 2004 Nick Welch (mack@incise.org)
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sig_handlers.h"
#include "playlist.h"
#include "directory.h"
#include "update.h"
#include "command.h"
#include "signal_check.h"
#include "log.h"
#include <sys/signal.h>
#include <sys/wait.h>
#include <errno.h>
int handlePendingSignals(void)
{
if (signal_is_pending(SIGINT) || signal_is_pending(SIGTERM)) {
DEBUG("main process got SIGINT or SIGTERM, exiting\n");
return COMMAND_RETURN_KILL;
}
if (signal_is_pending(SIGHUP)) {
DEBUG("got SIGHUP, rereading DB\n");
signal_clear(SIGHUP);
if (!isUpdatingDB()) {
readDirectoryDB();
playlistVersionChange();
}
if (cycle_log_files() < 0)
return COMMAND_RETURN_KILL;
}
return 0;
}
static void chldSigHandler(mpd_unused int sig)
{
int status;
int pid;
/* DEBUG("main process got SIGCHLD\n"); */
while (0 != (pid = wait3(&status, WNOHANG, NULL))) {
if (pid < 0) {
if (errno == EINTR)
continue;
else
break;
}
}
}
void initSigHandlers(void)
{
struct sigaction sa;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
while (sigaction(SIGPIPE, &sa, NULL) < 0 && errno == EINTR) ;
sa.sa_handler = chldSigHandler;
while (sigaction(SIGCHLD, &sa, NULL) < 0 && errno == EINTR) ;
signal_handle(SIGUSR1);
signal_handle(SIGINT);
signal_handle(SIGTERM);
signal_handle(SIGHUP);
}
void finishSigHandlers(void)
{
signal_unhandle(SIGINT);
signal_unhandle(SIGUSR1);
signal_unhandle(SIGTERM);
signal_unhandle(SIGHUP);
}
void ignoreSignals(void)
{
struct sigaction sa;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_sigaction = NULL;
while (sigaction(SIGPIPE, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGCHLD, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGUSR1, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGINT, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGTERM, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGHUP, &sa, NULL) < 0 && errno == EINTR) ;
}
void blockSignals(void)
{
sigset_t sset;
sigemptyset(&sset);
sigaddset(&sset, SIGCHLD);
sigaddset(&sset, SIGUSR1);
sigaddset(&sset, SIGHUP);
sigaddset(&sset, SIGINT);
sigaddset(&sset, SIGTERM);
while (sigprocmask(SIG_BLOCK, &sset, NULL) < 0 && errno == EINTR) ;
}
void unblockSignals(void)
{
sigset_t sset;
sigemptyset(&sset);
sigaddset(&sset, SIGCHLD);
sigaddset(&sset, SIGUSR1);
sigaddset(&sset, SIGHUP);
sigaddset(&sset, SIGINT);
sigaddset(&sset, SIGTERM);
while (sigprocmask(SIG_UNBLOCK, &sset, NULL) < 0 && errno == EINTR) ;
}
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