1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * 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 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _SYS_TIME_H_
30#define _SYS_TIME_H_
31
32#include <sys/cdefs.h>
33#include <sys/types.h>
34#include <linux/time.h>
35
36/* POSIX says <sys/time.h> gets you most of <sys/select.h> and may get you all of it. */
37#include <sys/select.h>
38
39__BEGIN_DECLS
40
41int gettimeofday(struct timeval* __tv, struct timezone* __tz);
42int settimeofday(const struct timeval* __tv, const struct timezone* __tz);
43
44int getitimer(int __which, struct itimerval* __current_value);
45int setitimer(int __which, const struct itimerval* __new_value, struct itimerval* __old_value);
46
47int utimes(const char* __path, const struct timeval __times[2]);
48
49#if defined(__USE_BSD)
50int futimes(int __fd, const struct timeval __times[2]) __INTRODUCED_IN(26);
51int lutimes(const char* __path, const struct timeval __times[2]) __INTRODUCED_IN(26);
52#endif
53
54#if defined(__USE_GNU)
55int futimesat(int __dir_fd, const char* __path, const struct timeval __times[2]) __INTRODUCED_IN(26);
56#endif
57
58#define timerclear(a)   \
59        ((a)->tv_sec = (a)->tv_usec = 0)
60
61#define timerisset(a)    \
62        ((a)->tv_sec != 0 || (a)->tv_usec != 0)
63
64#define timercmp(a, b, op)               \
65        ((a)->tv_sec == (b)->tv_sec      \
66        ? (a)->tv_usec op (b)->tv_usec   \
67        : (a)->tv_sec op (b)->tv_sec)
68
69#define timeradd(a, b, res)                           \
70    do {                                              \
71        (res)->tv_sec  = (a)->tv_sec  + (b)->tv_sec;  \
72        (res)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
73        if ((res)->tv_usec >= 1000000) {              \
74            (res)->tv_usec -= 1000000;                \
75            (res)->tv_sec  += 1;                      \
76        }                                             \
77    } while (0)
78
79#define timersub(a, b, res)                           \
80    do {                                              \
81        (res)->tv_sec  = (a)->tv_sec  - (b)->tv_sec;  \
82        (res)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
83        if ((res)->tv_usec < 0) {                     \
84            (res)->tv_usec += 1000000;                \
85            (res)->tv_sec  -= 1;                      \
86        }                                             \
87    } while (0)
88
89#define TIMEVAL_TO_TIMESPEC(tv, ts) {     \
90    (ts)->tv_sec = (tv)->tv_sec;          \
91    (ts)->tv_nsec = (tv)->tv_usec * 1000; \
92}
93#define TIMESPEC_TO_TIMEVAL(tv, ts) {     \
94    (tv)->tv_sec = (ts)->tv_sec;          \
95    (tv)->tv_usec = (ts)->tv_nsec / 1000; \
96}
97
98__END_DECLS
99
100#endif
101