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1/* nanosleep -- sleep for a period specified with a struct timespec
2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <mach.h>
21#include <sys/time.h>
22#include <time.h>
23#include <unistd.h>
24
25int
26__libc_nanosleep (const struct timespec *requested_time,
27 struct timespec *remaining)
28{
29 mach_port_t recv;
30 struct timeval before, after;
31
32 if (requested_time->tv_sec < 0
33 || requested_time->tv_nsec < 0
34 || requested_time->tv_nsec >= 1000000000)
35 {
36 errno = EINVAL;
37 return -1;
38 }
39
40 const mach_msg_timeout_t ms
41 = requested_time->tv_sec * 1000
42 + (requested_time->tv_nsec + 999999) / 1000000;
43
44 recv = __mach_reply_port ();
45
46 if (remaining && __gettimeofday (&before, NULL) < 0)
47 return -1;
48 error_t err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
49 0, 0, recv, ms, MACH_PORT_NULL);
50 __mach_port_destroy (mach_task_self (), recv);
51 if (err == EMACH_RCV_INTERRUPTED)
52 {
53 if (remaining && __gettimeofday (&after, NULL) >= 0)
54 {
55 struct timeval req_time, elapsed, rem;
56 TIMESPEC_TO_TIMEVAL (&req_time, requested_time);
57 timersub (&after, &before, &elapsed);
58 timersub (&req_time, &elapsed, &rem);
59 TIMEVAL_TO_TIMESPEC (&rem, remaining);
60 }
61
62 errno = EINTR;
63 return -1;
64 }
65
66 return 0;
67}
68weak_alias(__libc_nanosleep, __nanosleep)
69libc_hidden_def (__nanosleep)
70weak_alias (__libc_nanosleep, nanosleep)
71

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