38 lines
994 B
C
38 lines
994 B
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)ualarm.c 1.1 92/07/30 SMI"; /* from UCB 5.1 85/06/05 */
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#endif
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/*
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* Copyright (c) 1985 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#include <sys/time.h>
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#define USPS 1000000 /* # of microseconds in a second */
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/*
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* Generate a SIGALRM signal in ``usecs'' microseconds.
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* If ``reload'' is non-zero, keep generating SIGALRM
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* every ``reload'' microseconds after the first signal.
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*/
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unsigned
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ualarm(usecs, reload)
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register unsigned usecs;
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register unsigned reload;
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{
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struct itimerval new, old;
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new.it_interval.tv_usec = reload % USPS;
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new.it_interval.tv_sec = reload / USPS;
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new.it_value.tv_usec = usecs % USPS;
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new.it_value.tv_sec = usecs / USPS;
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if (setitimer(ITIMER_REAL, &new, &old) == 0)
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return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
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/* else */
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return (-1);
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}
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