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daemon.c
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daemon.c
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/* daemon,c
* $Id: daemon.c,v 1.3 2004/06/25 08:39:35 becker Exp $
* Ralf Becker <nctop@web.de>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sysexits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "daemon.h"
static char cvsid[] = "$Id: daemon.c,v 1.3 2004/06/25 08:39:35 becker Exp $";
int daemonmode(void) {
pid_t pid;
int status;
switch (pid = fork()) {
case -1: {
perror(NULL);
exit(EX_OSERR);
}
case 0: {
if (setsid() == -1) {
perror(NULL);
exit(EX_OSERR);
}
switch (pid = fork()) {
case -1: {
perror(NULL);
exit(EX_OSERR);
}
case 0: {
/* change umask */
umask(0);
/* nothing for stdin */
if (freopen("/dev/null","r",stdin) == NULL) {
perror("/dev/null");
}
/* open stdout/stderr to console */
if (freopen("/dev/console","w",stdout) == NULL) {
perror("/dev/console");
}
if (freopen("/dev/console","w",stderr) == NULL) {
perror("/dev/console");
}
return(0);
}
default: {
exit(EXIT_SUCCESS);
}
}
}
default: {
waitpid(pid,&status, 0);
exit(status);
}
}
}