/*
 * Sample program for alarm system clock  - No.27
 *
 * alarm(2) - set an alarm clock for delivery of a signal
 *
 * Synopsis
 *     #include <unistd.h>
 *
 *     unsigned int alarm(unsigned int seconds);
 *
 * Description
 *     alarm arranges for a SIGALRM signal to be delivered to the
 *     process in seconds seconds.
 *
 *     If seconds is zero, no new alarm is scheduled.
 *
 *     In any event any previously set alarm is cancelled.
 */

#include <stdio.h>
#include <signal.h>

/* signal handler for SIGALRM signal */
void sig_alarm(int sig)
{
	printf("recieved SIGALRM\n");
}

main()
{
	/* entry signal handler for SIGALRM signal to
	   the signal handler table */
	signal(SIGALRM, sig_alarm);

	alarm(2);
	printf("Please wait\n");

	/* invoking this process sleep until SIGALRM is recieved */
	pause();

	printf("End\n");

	exit(0);
}