130 lines
2.1 KiB
C
130 lines
2.1 KiB
C
/* $Id: daemonize.c,v 1.12 2011/05/27 09:35:02 nanard Exp $ */
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/* MiniUPnP project
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* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
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* (c) 2006 Thomas Bernard
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* This software is subject to the conditions detailed
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* in the LICENCE file provided within the distribution */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <string.h>
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#include <signal.h>
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#include "daemonize.h"
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#include "config.h"
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#ifndef USE_DAEMON
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int
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daemonize(void)
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{
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int pid, i;
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switch(fork())
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{
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/* fork error */
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case -1:
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perror("fork()");
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exit(1);
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/* child process */
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case 0:
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/* obtain a new process group */
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if( (pid = setsid()) < 0)
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{
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perror("setsid()");
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exit(1);
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}
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/* close all descriptors */
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for (i=getdtablesize();i>=0;--i) close(i);
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i = open("/dev/null", O_RDWR); /* open stdin */
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dup(i); /* stdout */
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dup(i); /* stderr */
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umask(027);
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chdir("/"); /* chdir to /tmp ? */
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return pid;
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/* parent process */
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default:
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exit(0);
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}
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}
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#endif
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int
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writepidfile(const char * fname, int pid)
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{
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char pidstring[16];
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int pidstringlen;
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int pidfile;
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if(!fname || fname[0] == '\0')
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return -1;
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if( (pidfile = open(fname, O_WRONLY|O_CREAT, 0644)) < 0)
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{
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syslog(LOG_ERR, "Unable to open pidfile for writing %s: %m", fname);
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return -1;
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}
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pidstringlen = snprintf(pidstring, sizeof(pidstring), "%d\n", pid);
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if(pidstringlen <= 0)
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{
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syslog(LOG_ERR,
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"Unable to write to pidfile %s: snprintf(): FAILED", fname);
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close(pidfile);
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return -1;
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}
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else
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{
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if(write(pidfile, pidstring, pidstringlen) < 0)
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syslog(LOG_ERR, "Unable to write to pidfile %s: %m", fname);
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}
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close(pidfile);
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return 0;
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}
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int
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checkforrunning(const char * fname)
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{
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char buffer[64];
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int pidfile;
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pid_t pid;
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if(!fname || fname[0] == '\0')
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return -1;
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if( (pidfile = open(fname, O_RDONLY)) < 0)
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return 0;
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memset(buffer, 0, 64);
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if(read(pidfile, buffer, 63))
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{
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if( (pid = atol(buffer)) > 0)
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{
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if(!kill(pid, 0))
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{
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close(pidfile);
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return -2;
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}
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}
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}
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close(pidfile);
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return 0;
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}
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