xref: /freebsd/lib/libsys/clock_gettime.c (revision 8e95079e175854b84e57c521b34b4b52f7ae9cb1)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/syscall.h>
29 #include <sys/time.h>
30 #include <sys/vdso.h>
31 #include <errno.h>
32 #include <time.h>
33 #include "libc_private.h"
34 
35 int __clock_gettime(clockid_t, struct timespec *ts);
36 
37 __weak_reference(__clock_gettime, clock_gettime);
38 
39 int
40 __clock_gettime(clockid_t clock_id, struct timespec *ts)
41 {
42 	int error;
43 
44 	if (__vdso_clock_gettime != NULL && __vdso_gettc != NULL)
45 		error = __vdso_clock_gettime(clock_id, ts);
46 	else
47 		error = ENOSYS;
48 	if (error == ENOSYS) {
49 		error = __sys_clock_gettime(clock_id, ts);
50 	} else if (error != 0) {
51 		errno = error;
52 		error = -1;
53 	}
54 	return (error);
55 }
56