#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main()
{
  pid_t pid;
  pid_t sid;

  pid = fork();

  if (pid < 0)
    exit(1);

  else if (pid == 0) {
    /* Daemonize the child */
    sid = setsid();
    if (sid < 0)
      exit(1);

    if (chdir("/") < 0)
      exit(1);

    freopen("/dev/null", "r", stdin);
    freopen("/dev/null", "w", stdout);
    /* But omit stderr... */
    /* freopen("/dev/null", "w", stderr); */
  }

  /* Do something */
  while(1) {
    sleep(2);
  }

  return 0;
}