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/*
* Copyright (C) 2003-2008 The Music Player Daemon Project
* 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 "daemon.h"
#include "conf.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void
daemonize_close_stdin(void)
{
int fd, st;
struct stat ss;
if ((st = fstat(STDIN_FILENO, &ss)) < 0) {
if ((fd = open("/dev/null", O_RDONLY) > 0)) {
g_debug("stdin closed, and could not open /dev/null "
"as fd=0, some external library bugs "
"may be exposed...");
close(fd);
}
return;
}
if (!isatty(STDIN_FILENO))
return;
if ((fd = open("/dev/null", O_RDONLY)) < 0)
g_error("failed to open /dev/null %s", strerror(errno));
if (dup2(fd, STDIN_FILENO) < 0)
g_error("dup2 stdin: %s", strerror(errno));
}
void
daemonize(Options *options)
{
#ifndef WIN32
FILE *fp = NULL;
ConfigParam *pidFileParam = parseConfigFilePath(CONF_PID_FILE, 0);
if (pidFileParam) {
/* do this before daemon'izing so we can fail gracefully if we can't
* write to the pid file */
g_debug("opening pid file");
fp = fopen(pidFileParam->value, "w+");
if (!fp) {
g_error("could not open %s \"%s\" (at line %i) for writing: %s",
CONF_PID_FILE, pidFileParam->value,
pidFileParam->line, strerror(errno));
}
}
if (options->daemon) {
int pid;
fflush(NULL);
pid = fork();
if (pid > 0)
_exit(EXIT_SUCCESS);
else if (pid < 0) {
g_error("problems fork'ing for daemon!");
}
if (chdir("/") < 0) {
g_error("problems changing to root directory");
}
if (setsid() < 0) {
g_error("problems setsid'ing");
}
fflush(NULL);
pid = fork();
if (pid > 0)
_exit(EXIT_SUCCESS);
else if (pid < 0) {
g_error("problems fork'ing for daemon!");
}
g_debug("daemonized!");
}
if (pidFileParam) {
g_debug("writing pid file");
fprintf(fp, "%lu\n", (unsigned long)getpid());
fclose(fp);
}
#else
/* no daemonization on WIN32 */
(void)options;
#endif
}
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