usr/src/lib/libc/gen/alarm.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)alarm.c     5.1 (Berkeley) %G%";
#endif not lint

/*
 * 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);
        if (oitv.it_value.tv_usec)
                oitv.it_value.tv_sec++;
        return (oitv.it_value.tv_sec);
}