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sleep.c (30493) sleep.c (30510)
1/*
2 * Copyright (c) 1989, 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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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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)
1/*
2 * Copyright (c) 1989, 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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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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)
35#if 0
35static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
36static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
37#endif
38static char rcsid[] =
39 "$Id$";
36#endif /* LIBC_SCCS and not lint */
37
40#endif /* LIBC_SCCS and not lint */
41
42#include <errno.h>
43#include <limits.h>
38#include <time.h>
39#include <unistd.h>
40
41unsigned int
42sleep(seconds)
43 unsigned int seconds;
44{
45 struct timespec time_to_sleep;
46 struct timespec time_remaining;
47
44#include <time.h>
45#include <unistd.h>
46
47unsigned int
48sleep(seconds)
49 unsigned int seconds;
50{
51 struct timespec time_to_sleep;
52 struct timespec time_remaining;
53
48 if (seconds != 0) {
49 time_to_sleep.tv_sec = seconds;
50 time_to_sleep.tv_nsec = 0;
51 time_remaining = time_to_sleep;
52 (void)nanosleep(&time_to_sleep, &time_remaining);
53 seconds = time_remaining.tv_sec;
54 if (time_remaining.tv_nsec > 0)
55 seconds++; /* round up */
56 }
57 return (seconds);
54 /*
55 * Avoid overflow when `seconds' is huge. This assumes that
56 * the maximum value for a time_t is >= LONG_MAX.
57 */
58 if (seconds > LONG_MAX)
59 return (seconds - LONG_MAX + sleep(LONG_MAX));
60
61 time_to_sleep.tv_sec = seconds;
62 time_to_sleep.tv_nsec = 0;
63 if (nanosleep(&time_to_sleep, &time_remaining) != -1)
64 return (0);
65 if (errno != EINTR)
66 return (seconds); /* best guess */
67 return (time_remaining.tv_sec +
68 (time_remaining.tv_nsec != 0)); /* round up */
58}
69}