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/* $Id$ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
*
* Copyright (c) 2006, Thomas Bernard
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "daemonize.h"
#include "config.h"
#include "log.h"
#ifndef USE_DAEMON
int
daemonize(void)
{
int pid, i;
switch(fork())
{
/* fork error */
case -1:
perror("fork()");
exit(1);
/* child process */
case 0:
/* obtain a new process group */
if( (pid = setsid()) < 0)
{
perror("setsid()");
exit(1);
}
/* close all descriptors */
for (i=getdtablesize();i>=0;--i) close(i);
i = open("/dev/null",O_RDWR); /* open stdin */
dup(i); /* stdout */
dup(i); /* stderr */
umask(027);
chdir("/"); /* chdir to /tmp ? */
return pid;
/* parent process */
default:
exit(0);
}
}
#endif
int
writepidfile(const char * fname, int pid)
{
char pidstring[16];
int pidstringlen;
int pidfile;
if(!fname || (strlen(fname) == 0))
return -1;
if( (pidfile = open(fname, O_WRONLY|O_CREAT, 0644)) < 0)
{
DPRINTF(E_ERROR, L_GENERAL, "Unable to open pidfile for writing %s: %s\n", fname, strerror(errno));
return -1;
}
pidstringlen = snprintf(pidstring, sizeof(pidstring), "%d\n", pid);
if(pidstringlen <= 0)
{
DPRINTF(E_ERROR, L_GENERAL,
"Unable to write to pidfile %s: snprintf(): FAILED\n", fname);
close(pidfile);
return -1;
}
else
{
if(write(pidfile, pidstring, pidstringlen) < 0)
DPRINTF(E_ERROR, L_GENERAL, "Unable to write to pidfile %s: %s\n", fname, strerror(errno));
}
close(pidfile);
return 0;
}
int
checkforrunning(const char * fname)
{
char buffer[64];
int pidfile;
pid_t pid;
if(!fname || (strlen(fname) == 0))
return -1;
if( (pidfile = open(fname, O_RDONLY)) < 0)
return 0;
memset(buffer, 0, 64);
if(read(pidfile, buffer, 63))
{
if( (pid = atol(buffer)) > 0)
{
if(!kill(pid, 0))
{
close(pidfile);
return -2;
}
}
}
close(pidfile);
return 0;
}