#define _GNU_SOURCE

#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>

int	event_fd;
struct sigaction	act;

void handler(int sig, siginfo_t *si, void *data)
{
	event_fd = si->si_fd;
	printf("handler called!\n");
	exit(0);
}

int main(void)
{
	int fd;
	act.sa_sigaction = handler;
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_SIGINFO;
	sigaction(SIGRTMIN, &act, NULL);
	if ((fd = open("/tmp/mytest", O_RDONLY|O_CREAT,0777)) == -1)
		printf("Create file failed: %d, %s \n", errno, strerror(errno));

	fcntl(fd, F_SETSIG, SIGRTMIN);
	if(fcntl(fd, F_SETLEASE, F_WRLCK) == -1) {
		printf("F_SETLEASE, F_WRLCK failed: %d, %s \n", 
				errno, strerror(errno));
		exit(1);
	}
	fd = open("/tmp/mytest", O_RDWR|O_CREAT,0777);
	while(1) 
		sleep(1);
}