#define _GNU_SOURCE	/* needed to get the defines */
  #include <fcntl.h>	/* in glibc 2.2 this has the needed
  				   values defined */
  #include <signal.h>
  #include <stdio.h>
  #include <unistd.h>
  
  static volatile int event_fd;
  
  static void handler(int sig, siginfo_t *si, void *data)
  {
  	event_fd = si->si_fd;
  }
  
  int main(void)
  {
  	struct sigaction act;
  	int fd;
  
  	act.sa_sigaction = handler;
  	sigemptyset(&act.sa_mask);
  	act.sa_flags = SA_SIGINFO;
  	sigaction(SIGRTMIN + 1, &act, NULL);
  
  	fd = open(".", O_RDONLY);
  	fcntl(fd, F_SETSIG, SIGRTMIN + 1);
  	fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
  	/* we will now be notified if any of the files
  	   in "." is modified or new files are created */
  	while (1) {
  		pause();
  		printf("Got event on fd=%d
  ", event_fd);
  	}
  }