time.h revision 1541 
1/*
2 * Copyright (c) 1982, 1986, 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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)time.h	8.1 (Berkeley) 6/2/93
34 */
35
36#ifndef _SYS_TIME_H_
37#define _SYS_TIME_H_
38
39/*
40 * Structure returned by gettimeofday(2) system call,
41 * and used in other calls.
42 */
43struct timeval {
44	long	tv_sec;		/* seconds */
45	long	tv_usec;	/* and microseconds */
46};
47
48/*
49 * Structure defined by POSIX.4 to be like a timeval.
50 */
51struct timespec {
52	long	ts_sec;		/* seconds */
53	long	ts_nsec;	/* and nanoseconds */
54};
55
56#define	TIMEVAL_TO_TIMESPEC(tv, ts) {					\
57	(ts)->ts_sec = (tv)->tv_sec;					\
58	(ts)->ts_nsec = (tv)->tv_usec * 1000;				\
59}
60#define	TIMESPEC_TO_TIMEVAL(tv, ts) {					\
61	(tv)->tv_sec = (ts)->ts_sec;					\
62	(tv)->tv_usec = (ts)->ts_nsec / 1000;				\
63}
64
65struct timezone {
66	int	tz_minuteswest;	/* minutes west of Greenwich */
67	int	tz_dsttime;	/* type of dst correction */
68};
69#define	DST_NONE	0	/* not on dst */
70#define	DST_USA		1	/* USA style dst */
71#define	DST_AUST	2	/* Australian style dst */
72#define	DST_WET		3	/* Western European dst */
73#define	DST_MET		4	/* Middle European dst */
74#define	DST_EET		5	/* Eastern European dst */
75#define	DST_CAN		6	/* Canada */
76
77/* Operations on timevals. */
78#define	timerclear(tvp)		(tvp)->tv_sec = (tvp)->tv_usec = 0
79#define	timerisset(tvp)		((tvp)->tv_sec || (tvp)->tv_usec)
80#define	timercmp(tvp, uvp, cmp)						\
81	(((tvp)->tv_sec == (uvp)->tv_sec) ?				\
82	    ((tvp)->tv_usec cmp (uvp)->tv_usec) :			\
83	    ((tvp)->tv_sec cmp (uvp)->tv_sec))
84
85/*
86 * Names of the interval timers, and structure
87 * defining a timer setting.
88 */
89#define	ITIMER_REAL	0
90#define	ITIMER_VIRTUAL	1
91#define	ITIMER_PROF	2
92
93struct	itimerval {
94	struct	timeval it_interval;	/* timer interval */
95	struct	timeval it_value;	/* current value */
96};
97
98/*
99 * Getkerninfo clock information structure
100 */
101struct clockinfo {
102	int	hz;		/* clock frequency */
103	int	tick;		/* micro-seconds per hz tick */
104	int	stathz;		/* statistics clock frequency */
105	int	profhz;		/* profiling clock frequency */
106};
107
108#ifndef KERNEL
109#include <time.h>
110
111#ifndef _POSIX_SOURCE
112#include <sys/cdefs.h>
113
114__BEGIN_DECLS
115int	adjtime __P((const struct timeval *, struct timeval *));
116int	getitimer __P((int, struct itimerval *));
117int	gettimeofday __P((struct timeval *, struct timezone *));
118int	setitimer __P((int, const struct itimerval *, struct itimerval *));
119int	settimeofday __P((const struct timeval *, const struct timezone *));
120int	utimes __P((const char *, const struct timeval *));
121__END_DECLS
122#endif /* !POSIX */
123
124#endif /* !KERNEL */
125
126#endif /* !_SYS_TIME_H_ */
127