/* the Music Player Daemon (MPD)
* (c)2003-2006 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 "player.h"
#include "playerData.h"
#include "playlist.h"
#include "directory.h"
#include "command.h"
#include "signal_check.h"
#include "log.h"
#include "player.h"
#include "decode.h"
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
extern volatile int masterPid;
extern volatile int mainPid;
int masterHandlePendingSignals()
{
if (signal_is_pending(SIGINT) || signal_is_pending(SIGTERM)) {
DEBUG("master process got SIGINT or SIGTERM, exiting\n");
return COMMAND_RETURN_KILL;
}
if (signal_is_pending(SIGHUP)) {
signal_clear(SIGHUP);
/* Forward it to the main process, which will update the DB */
kill(mainPid, SIGHUP);
}
return 0;
}
int handlePendingSignals()
{
/* this SIGUSR1 signal comes before the KILL signals, because there if the process is
* looping, waiting for this signal, it will not respond to the KILL signal. This might be
* better implemented by using bit-wise defines and or'ing of the COMMAND_FOO as return.
*/
if (signal_is_pending(SIGUSR1)) {
signal_clear(SIGUSR1);
DEBUG("The master process is ready to receive signals\n");
return COMMAND_MASTER_READY;
}
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;
playerCycleLogFiles();
}
return 0;
}
void chldSigHandler(int signal)
{
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;
}
directory_sigChldHandler(pid, status);
}
}
void masterChldSigHandler(int signal)
{
int status;
int pid;
DEBUG("master process got SIGCHLD\n");
while (0 != (pid = wait3(&status, WNOHANG, NULL))) {
if (pid < 0) {
if (errno == EINTR)
continue;
else
break;
}
DEBUG("PID: %d\n", pid);
if (pid == mainPid)
kill(getpid(), SIGTERM);
player_sigChldHandler(pid, status);
}
}
int playerInitReal();
void masterSigUsr2Handler(int signal)
{
DEBUG("Master process got SIGUSR2 starting a new player process\n");
if (getPlayerPid() <= 0)
playerInitReal();
}
void masterInitSigHandlers()
{
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 = masterChldSigHandler;
while (sigaction(SIGCHLD, &sa, NULL) < 0 && errno == EINTR) ;
sa.sa_handler = masterSigUsr2Handler;
while (sigaction(SIGUSR2, &sa, NULL) < 0 && errno == EINTR) ;
signal_handle(SIGUSR1);
signal_handle(SIGINT);
signal_handle(SIGTERM);
signal_handle(SIGHUP);
}
void initSigHandlers()
{
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(SIGUSR2);
signal_handle(SIGUSR1);
signal_handle(SIGINT);
signal_handle(SIGTERM);
signal_handle(SIGHUP);
}
void finishSigHandlers()
{
signal_unhandle(SIGINT);
signal_unhandle(SIGUSR1);
signal_unhandle(SIGTERM);
signal_unhandle(SIGHUP);
}
void setSigHandlersForDecoder()
{
struct sigaction sa;
finishSigHandlers();
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
while (sigaction(SIGHUP, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGINT, &sa, NULL) < 0 && errno == EINTR) ;
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = decodeSigHandler;
while (sigaction(SIGCHLD, &sa, NULL) < 0 && errno == EINTR) ;
while (sigaction(SIGTERM, &sa, NULL) < 0 && errno == EINTR) ;
}
void ignoreSignals()
{
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(SIGUSR2, &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 waitOnSignals()
{
sigset_t sset;
sigfillset(&sset);
sigdelset(&sset, SIGCHLD);
sigdelset(&sset, SIGUSR1);
sigdelset(&sset, SIGUSR2);
sigdelset(&sset, SIGHUP);
sigdelset(&sset, SIGINT);
sigdelset(&sset, SIGTERM);
sigsuspend(&sset);
}
void blockSignals()
{
sigset_t sset;
sigemptyset(&sset);
sigaddset(&sset, SIGCHLD);
sigaddset(&sset, SIGUSR1);
sigaddset(&sset, SIGUSR2);
sigaddset(&sset, SIGHUP);
sigaddset(&sset, SIGINT);
sigaddset(&sset, SIGTERM);
while (sigprocmask(SIG_BLOCK, &sset, NULL) < 0 && errno == EINTR) ;
}
void unblockSignals()
{
sigset_t sset;
sigemptyset(&sset);
sigaddset(&sset, SIGCHLD);
sigaddset(&sset, SIGUSR1);
sigaddset(&sset, SIGUSR2);
sigaddset(&sset, SIGHUP);
sigaddset(&sset, SIGINT);
sigaddset(&sset, SIGTERM);
while (sigprocmask(SIG_UNBLOCK, &sset, NULL) < 0 && errno == EINTR) ;
}
