ualarm.c (6c06b4e2aa2a28d1f0bbd29ecdce35aaaf600ce8) ualarm.c (22626efa0f96cbca4edae882e46cb56b1879706b)
1/*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)ualarm.c 8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
1/*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 20 unchanged lines hidden (view full) ---

29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)ualarm.c 8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
37
38#include <sys/time.h>
39#include <unistd.h>
40
41#define USPS 1000000 /* # of microseconds in a second */
42
43/*
44 * Generate a SIGALRM signal in ``usecs'' microseconds.
45 * If ``reload'' is non-zero, keep generating SIGALRM
46 * every ``reload'' microseconds after the first signal.
47 */
48unsigned
49ualarm(usecs, reload)
39
40#include <sys/time.h>
41#include <unistd.h>
42
43#define USPS 1000000 /* # of microseconds in a second */
44
45/*
46 * Generate a SIGALRM signal in ``usecs'' microseconds.
47 * If ``reload'' is non-zero, keep generating SIGALRM
48 * every ``reload'' microseconds after the first signal.
49 */
50unsigned
51ualarm(usecs, reload)
50 register unsigned usecs;
51 register unsigned reload;
52 unsigned usecs;
53 unsigned reload;
52{
53 struct itimerval new, old;
54
55 new.it_interval.tv_usec = reload % USPS;
56 new.it_interval.tv_sec = reload / USPS;
57
58 new.it_value.tv_usec = usecs % USPS;
59 new.it_value.tv_sec = usecs / USPS;
60
61 if (setitimer(ITIMER_REAL, &new, &old) == 0)
62 return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
63 /* else */
64 return (-1);
65}
54{
55 struct itimerval new, old;
56
57 new.it_interval.tv_usec = reload % USPS;
58 new.it_interval.tv_sec = reload / USPS;
59
60 new.it_value.tv_usec = usecs % USPS;
61 new.it_value.tv_sec = usecs / USPS;
62
63 if (setitimer(ITIMER_REAL, &new, &old) == 0)
64 return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
65 /* else */
66 return (-1);
67}