| | 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 |
| | 9 | * notice, this list of conditions and the following disclaimer. |
| | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 11 | * notice, this list of conditions and the following disclaimer in the |
| | 12 | * documentation and/or other materials provided with the distribution. |
| | 13 | * 4. Neither the name of the University nor the names of its contributors |
| | 14 | * may be used to endorse or promote products derived from this software |
| | 15 | * without specific prior written permission. |
| | 16 | * |
| | 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 27 | * SUCH DAMAGE. |
| | 28 | */ |
| | 29 | |
| | 30 | #if defined(VARIANT_CANCELABLE) && __DARWIN_NON_CANCELABLE != 0 |
| | 31 | #error cancellable call vs. __DARWIN_NON_CANCELABLE mismatch |
| | 32 | #endif |
| | 33 | |
| | 34 | #if defined(LIBC_SCCS) && !defined(lint) |
| | 35 | static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93"; |
| | 36 | #endif /* LIBC_SCCS and not lint */ |
| | 37 | #include <sys/cdefs.h> |
| | 38 | __FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.33 2009/12/05 19:31:38 ed Exp $"); |
| | 39 | |
| | 40 | #include "namespace.h" |
| | 41 | #include <errno.h> |
| | 42 | #include <limits.h> |
| | 43 | #include <time.h> |
| | 44 | #include <unistd.h> |
| | 45 | #include "un-namespace.h" |
| | 46 | |
| | 47 | unsigned int |
| | 48 | __sleep(unsigned int seconds) |
| | 49 | { |
| | 50 | struct timespec time_to_sleep; |
| | 51 | struct timespec time_remaining; |
| | 52 | |
| | 53 | /* |
| | 54 | * Avoid overflow when `seconds' is huge. This assumes that |
| | 55 | * the maximum value for a time_t is >= INT_MAX. |
| | 56 | */ |
| | 57 | if (seconds > INT_MAX) |
| | 58 | return (seconds - INT_MAX + __sleep(INT_MAX)); |
| | 59 | |
| | 60 | time_to_sleep.tv_sec = seconds; |
| | 61 | time_to_sleep.tv_nsec = 0; |
| | 62 | if (_nanosleep(&time_to_sleep, &time_remaining) != -1) |
| | 63 | return (0); |
| | 64 | if (errno != EINTR) |
| | 65 | return (seconds); /* best guess */ |
| | 66 | return (time_remaining.tv_sec + |
| | 67 | (time_remaining.tv_nsec != 0)); /* round up */ |
| | 68 | } |
| | 69 | |
| | 70 | __weak_reference(__sleep, sleep); |
| | 71 | __weak_reference(__sleep, _sleep); |
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