diff options
Diffstat (limited to 'trunk/src/sig_handlers.c')
| -rw-r--r-- | trunk/src/sig_handlers.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/trunk/src/sig_handlers.c b/trunk/src/sig_handlers.c new file mode 100644 index 000000000..fc29d2522 --- /dev/null +++ b/trunk/src/sig_handlers.c @@ -0,0 +1,159 @@ +/* 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 "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> + +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; + playerCycleLogFiles(); + } + + return 0; +} + +static 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; + } + player_sigChldHandler(pid, status); + directory_sigChldHandler(pid, status); + } +} + +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 setSigHandlersForDecoder(void) +{ + 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(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) ; +} |