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/*
* Copyright (c) 1997, 98, 2000, 01
* Motoyuki Kasahara
*
* 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, 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.
*/
/*
* This program requires the following Autoconf macros:
* AC_TYPE_PID_T
* AC_CHECK_HEADERS(fcntl.h, unistd.h)
* AC_CHECK_FUNCS(setsid)
* AC_FUNC_SETPGRP
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#include <syslog.h>
#include <errno.h>
#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
#if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)
#include <memory.h>
#endif /* not STDC_HEADERS and HAVE_MEMORY_H */
#else /* not STDC_HEADERS and not HAVE_STRING_H */
#include <strings.h>
#endif /* not STDC_HEADERS and not HAVE_STRING_H */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#else
#include <sys/file.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef HAVE_SETSID
#include <sys/ioctl.h>
#endif
#ifdef USE_FAKELOG
#include "fakelog.h"
#endif
/*
* Run the current process as daemon.
*/
int
daemonize()
{
pid_t pid;
#ifndef HAVE_SETSID
int fd = -1;
#endif
/*
* Fork, and then the parent exits.
*/
pid = fork();
if (pid < 0) {
syslog(LOG_ERR, "fork() failed, %s", strerror(errno));
goto failed;
} else if (0 < pid)
exit(0);
/*
* Close a tty.
*/
#ifdef HAVE_SETSID
if ((int)setsid() < 0) {
syslog(LOG_ERR, "setsid() failed, %s", strerror(errno));
goto failed;
}
#else
#ifdef SETPGRP_VOID
setpgrp();
#else /* not SETPGRP_VOID */
if (setpgrp(0, getpid()) < 0) {
syslog(LOG_ERR, "setpgrp() failed, %s", strerror(errno));
goto failed;
}
#endif /* not SETPGRP_VOID */
#ifdef TIOCNOTTY
fd = open("/dev/tty" , O_RDWR);
if (0 <= fd) {
if (ioctl(fd, TIOCNOTTY, NULL) < 0) {
syslog(LOG_ERR, "ioctl(TIOCNOTTY) failed", strerror(errno));
goto failed;
}
if (close(fd) < 0) {
syslog(LOG_ERR, "failed to close the file, %s: /dev/tty",
strerror(errno));
fd = -1;
goto failed;
}
}
#endif /* TIOCNOTTY */
#endif /* HAVE_SETSID */
/*
* Change the current directory to root (`/').
*/
if (chdir("/") < 0) {
syslog(LOG_ERR, "failed to change directory to root, %s",
strerror(errno));
goto failed;
}
syslog(LOG_DEBUG, "debug: run as daemon");
return 0;
/*
* An error occurs...
*/
failed:
#ifndef HAVE_SETSID
if (0 <= fd && close(fd) < 0) {
syslog(LOG_ERR, "failed to close the file, %s: /dev/tty",
strerror(errno));
}
#endif
syslog(LOG_ERR, "failed to run as daemon");
return -1;
}
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