/*
 * Sapmple program for pause system call  - No.29
 *
 * pause(2) - wait for signal
 *
 * Synopsis
 *     #include <unistd.h>
 *
 *     int pause(void);
 *
 * Description
 *     The pause library function causes the invoking process (or
 *     thered) to sleep unitil a signal is received that either
 *     terminates it or causes it to call a signal-catching function.
 */

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

/* signal-catching function */
void sig_alarm(int sig)
{
	printf("SIGALRM\n");
}

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

	printf("Waiting\n");
	alarm(2);
	pause();

	exit(0);
}