[unix-history] / usr / src / lib / libc / gen / ualarm.c

/* @(#)ualarm.c	1.1	(Berkeley)	%G% */

#include <sys/time.h>

#define	USPS	1000000		/* # of microseconds in a second */

/*
 * Generate a SIGALRM signal in ``usecs'' microseconds.
 * If ``reload'' is non-zero, keep generating SIGALRM
 * every ``reload'' microseconds after the first signal.
 */
unsigned
ualarm(usecs, reload)
	register unsigned usecs;
	register unsigned reload;
{
	struct itimerval new, old;

	new.it_interval.tv_usec = reload % USPS;
	new.it_interval.tv_sec = reload / USPS;
	
	new.it_value.tv_usec = usecs % USPS;
	new.it_value.tv_sec = usecs / USPS;

	if (setitimer(ITIMER_REAL, &new, &old) == 0)
		return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
	/* else */
		return (-1);
}
Commit	Line	Data
63dcf418 S	1	/* @(#)ualarm.c 1.1 (Berkeley) %G% */
	2
	3	#include <sys/time.h>
	4
	5	#define USPS 1000000 /* # of microseconds in a second */
	6
	7	/*
	8	* Generate a SIGALRM signal in ``usecs'' microseconds.
	9	* If ``reload'' is non-zero, keep generating SIGALRM
	10	* every ``reload'' microseconds after the first signal.
	11	*/
	12	unsigned
	13	ualarm(usecs, reload)
	14	register unsigned usecs;
	15	register unsigned reload;
	16	{
	17	struct itimerval new, old;
	18
	19	new.it_interval.tv_usec = reload % USPS;
	20	new.it_interval.tv_sec = reload / USPS;
	21
	22	new.it_value.tv_usec = usecs % USPS;
	23	new.it_value.tv_sec = usecs / USPS;
	24
	25	if (setitimer(ITIMER_REAL, &new, &old) == 0)
	26	return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
	27	/* else */
	28	return (-1);
	29	}