10Sstevel@tonic-gate /*
2*6812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
30Sstevel@tonic-gate * Use is subject to license terms.
40Sstevel@tonic-gate */
50Sstevel@tonic-gate
60Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
70Sstevel@tonic-gate /* All Rights Reserved */
80Sstevel@tonic-gate
90Sstevel@tonic-gate /*
100Sstevel@tonic-gate * Copyright (c) 1985 Regents of the University of California.
110Sstevel@tonic-gate * All rights reserved. The Berkeley software License Agreement
120Sstevel@tonic-gate * specifies the terms and conditions for redistribution.
130Sstevel@tonic-gate */
140Sstevel@tonic-gate
15*6812Sraf #pragma ident "%Z%%M% %I% %E% SMI"
16*6812Sraf
17*6812Sraf #include "lint.h"
180Sstevel@tonic-gate #include <sys/types.h>
190Sstevel@tonic-gate #include <sys/time.h>
200Sstevel@tonic-gate #include <unistd.h>
210Sstevel@tonic-gate
220Sstevel@tonic-gate #define USPS 1000000 /* # of microseconds in a second */
230Sstevel@tonic-gate
240Sstevel@tonic-gate /*
250Sstevel@tonic-gate * Generate a SIGALRM signal in ``usecs'' microseconds.
260Sstevel@tonic-gate * If ``reload'' is non-zero, keep generating SIGALRM
270Sstevel@tonic-gate * every ``reload'' microseconds after the first signal.
280Sstevel@tonic-gate */
290Sstevel@tonic-gate useconds_t
ualarm(useconds_t usecs,useconds_t reload)300Sstevel@tonic-gate ualarm(useconds_t usecs, useconds_t reload)
310Sstevel@tonic-gate {
320Sstevel@tonic-gate struct itimerval new, old;
330Sstevel@tonic-gate
340Sstevel@tonic-gate new.it_interval.tv_usec = reload % USPS;
350Sstevel@tonic-gate new.it_interval.tv_sec = reload / USPS;
360Sstevel@tonic-gate
370Sstevel@tonic-gate new.it_value.tv_usec = usecs % USPS;
380Sstevel@tonic-gate new.it_value.tv_sec = usecs / USPS;
390Sstevel@tonic-gate
400Sstevel@tonic-gate if (setitimer(ITIMER_REAL, &new, &old) != 0)
410Sstevel@tonic-gate return (0); /* no errors are defined */
420Sstevel@tonic-gate return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
430Sstevel@tonic-gate }
44