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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <syslog.h>
#include <time.h>
static void daemonize(void)
{
int i;
/* fork once to go into the background */
switch(fork())
{
case 0: break; /* child */
case -1: exit(1); /* error */
default: exit(0); /* parent */
}
/* get a new process group/session, no controlling terminal */
if(setsid()<0) exit(1);
/* change the file mode mask */
umask(0);
/* close all descriptors */
for (i=sysconf(_SC_OPEN_MAX);i>=0;--i) close(i);
/* run in a specific directory */
chdir("/");
/* redirect stdio */
open ("/dev/null",O_RDWR);
(void) dup(0);
(void) dup(0);
/* we are now a daemon */
}
void hup_handler(int x)
{
syslog(LOG_DAEMON | LOG_INFO, "Server received SIGHUP at %d\n",
time(0));
signal(SIGHUP, hup_handler);
}
int main()
{
daemonize();
if (signal(SIGHUP, hup_handler) == SIG_ERR) {
syslog(LOG_DAEMON | LOG_INFO, "Server failed to install signal handler\n");
}
while(1) {
sleep(1);
}
}
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