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#ifndef _SYS_TIME_H_
29#define _SYS_TIME_H_
30
31#include <sys/cdefs.h>
32#include <sys/types.h>
33#include <linux/time.h>
34
35__BEGIN_DECLS
36
37extern int gettimeofday(struct timeval *, struct timezone *);
38extern int settimeofday(const struct timeval *, const struct timezone *);
39
40extern int getitimer(int, struct itimerval *);
41extern int setitimer(int, const struct itimerval *, struct itimerval *);
42
43extern int utimes(const char *, const struct timeval *);
44
45#define timerclear(a)   \
46        ((a)->tv_sec = (a)->tv_usec = 0)
47
48#define timerisset(a)    \
49        ((a)->tv_sec != 0 || (a)->tv_usec != 0)
50
51#define timercmp(a, b, op)               \
52        ((a)->tv_sec == (b)->tv_sec      \
53        ? (a)->tv_usec op (b)->tv_usec   \
54        : (a)->tv_sec op (b)->tv_sec)
55
56#define timeradd(a, b, res)                           \
57    do {                                              \
58        (res)->tv_sec  = (a)->tv_sec  + (b)->tv_sec;  \
59        (res)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
60        if ((res)->tv_usec >= 1000000) {              \
61            (res)->tv_usec -= 1000000;                \
62            (res)->tv_sec  += 1;                      \
63        }                                             \
64    } while (0)
65
66#define timersub(a, b, res)                           \
67    do {                                              \
68        (res)->tv_sec  = (a)->tv_sec  - (b)->tv_sec;  \
69        (res)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
70        if ((res)->tv_usec < 0) {                     \
71            (res)->tv_usec += 1000000;                \
72            (res)->tv_sec  -= 1;                      \
73        }                                             \
74    } while (0)
75
76__END_DECLS
77
78#endif /* _SYS_TIME_H_ */
79