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BSD 4.2

/*	alarm.c	4.1	83/06/10	*/

/*
 * Backwards compatible alarm.
 */
#include <sys/time.h>

alarm(secs)
	int secs;
{
	struct itimerval it, oitv;
	register struct itimerval *itp = &it;

	timerclear(&itp->it_interval);
	itp->it_value.tv_sec = secs;
	itp->it_value.tv_usec = 0;
	if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
		return (-1);
	return (oitv.it_value.tv_sec);
}

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