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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#include <sys/types.h>
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#define G_LOG_DOMAIN "daemon"
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/** the Unix user name which MPD runs as */
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static char *user_name;
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/** the Unix user id which MPD runs as */
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static uid_t user_uid;
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/** the Unix group id which MPD runs as */
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static gid_t user_gid;
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/** the absolute path of the pidfile */
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g_error("no pid_file specified in the config file");
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fp = fopen(pidfile, "r");
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g_error("unable to open pid file \"%s\": %s",
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pidfile, g_strerror(errno));
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if (fscanf(fp, "%i", &pid) != 1) {
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g_error("unable to read the pid from file \"%s\"",
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ret = kill(pid, SIGTERM);
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g_error("unable to kill proccess %i: %s",
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pid, g_strerror(errno));
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g_error("--kill is not available on WIN32");
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daemonize_close_stdin(void)
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int fd = open("/dev/null", O_RDONLY);
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else if (fd != STDIN_FILENO) {
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dup2(fd, STDIN_FILENO);
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daemonize_set_user(void)
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if (user_name == NULL)
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if (setgid(user_gid) == -1) {
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g_error("cannot setgid for user \"%s\": %s",
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user_name, g_strerror(errno));
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/* init suplementary groups
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* (must be done before we change our uid)
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if (initgroups(user_name, user_gid) == -1) {
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g_warning("cannot init supplementary groups "
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"of user \"%s\": %s",
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user_name, g_strerror(errno));
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if (setuid(user_uid) == -1) {
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g_error("cannot change to uid of user \"%s\": %s",
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user_name, g_strerror(errno));
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daemonize_detach(void)
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/* flush all file handles before duplicating the buffers */
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/* detach from parent process */
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g_error("fork() failed: %s", g_strerror(errno));
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/* exit the parent process */
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/* release the current working directory */
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g_error("problems changing to root directory");
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/* detach from the current session */
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g_debug("daemonized!");
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daemonize(bool detach)
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if (pidfile != NULL) {
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/* do this before daemon'izing so we can fail gracefully if we can't
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* write to the pid file */
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g_debug("opening pid file");
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fp = fopen(pidfile, "w+");
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g_error("could not create pid file \"%s\": %s",
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pidfile, g_strerror(errno));
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if (pidfile != NULL) {
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g_debug("writing pid file");
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fprintf(fp, "%lu\n", (unsigned long)getpid());
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/* no daemonization on WIN32 */
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daemonize_init(const char *user, const char *_pidfile)
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if (user != NULL && strcmp(user, g_get_user_name()) != 0) {
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user_name = g_strdup(user);
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pwd = getpwnam(user_name);
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g_error("no such user \"%s\"", user_name);
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user_uid = pwd->pw_uid;
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user_gid = pwd->pw_gid;
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/* this is needed by libs such as arts */
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g_setenv("HOME", pwd->pw_dir, true);
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pidfile = g_strdup(_pidfile);
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daemonize_finish(void)
added
removed
src/daemon.c
