/* 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 "database.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> #include <glib.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()) { db_load(); playlistVersionChange(); } if (cycle_log_files() < 0) return COMMAND_RETURN_KILL; } return 0; } static void chldSigHandler(G_GNUC_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) ; }