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_time.h
1 /* $OpenBSD: time.h,v 1.11 2000/10/10 13:36:48 itojun Exp $ */
2 /* $NetBSD: time.h,v 1.18 1996/04/23 10:29:33 mycroft Exp $ */
3 
4 /*
5  * Copyright (c) 1982, 1986, 1993
6  * The Regents of the University of California. All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * @(#)time.h 8.2 (Berkeley) 7/10/94
33  */
34 
35 #ifndef _SYS_TIME_H_
36 #define _SYS_TIME_H_
37 
38 #include <sys/types.h>
39 
40 /*
41  * Structure returned by gettimeofday(2) system call,
42  * and used in other calls.
43  */
44 struct timeval {
45  long tv_sec; /* seconds */
46  long tv_usec; /* and microseconds */
47 };
48 
49 /*
50  * Structure defined by POSIX.1b to be like a timeval.
51  */
52 struct timespec {
53  time_t tv_sec; /* seconds */
54  long tv_nsec; /* and nanoseconds */
55 };
56 
57 #define TIMEVAL_TO_TIMESPEC(tv, ts) { \
58  (ts)->tv_sec = (tv)->tv_sec; \
59  (ts)->tv_nsec = (tv)->tv_usec * 1000; \
60 }
61 #define TIMESPEC_TO_TIMEVAL(tv, ts) { \
62  (tv)->tv_sec = (ts)->tv_sec; \
63  (tv)->tv_usec = (ts)->tv_nsec / 1000; \
64 }
65 
66 struct timezone {
67  int tz_minuteswest; /* minutes west of Greenwich */
68  int tz_dsttime; /* type of dst correction */
69 };
70 #define DST_NONE 0 /* not on dst */
71 #define DST_USA 1 /* USA style dst */
72 #define DST_AUST 2 /* Australian style dst */
73 #define DST_WET 3 /* Western European dst */
74 #define DST_MET 4 /* Middle European dst */
75 #define DST_EET 5 /* Eastern European dst */
76 #define DST_CAN 6 /* Canada */
77 
78 /* Operations on timevals. */
79 #define timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
80 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
81 #define timercmp(tvp, uvp, cmp) \
82  (((tvp)->tv_sec == (uvp)->tv_sec) ? \
83  ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
84  ((tvp)->tv_sec cmp (uvp)->tv_sec))
85 #define timeradd(tvp, uvp, vvp) \
86  do { \
87  (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
88  (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
89  if ((vvp)->tv_usec >= 1000000) { \
90  (vvp)->tv_sec++; \
91  (vvp)->tv_usec -= 1000000; \
92  } \
93  } while (0)
94 #define timersub(tvp, uvp, vvp) \
95  do { \
96  (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
97  (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
98  if ((vvp)->tv_usec < 0) { \
99  (vvp)->tv_sec--; \
100  (vvp)->tv_usec += 1000000; \
101  } \
102  } while (0)
103 
104 /* Operations on timespecs. */
105 #define timespecclear(tsp) (tsp)->tv_sec = (tsp)->tv_nsec = 0
106 #define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec)
107 #define timespeccmp(tsp, usp, cmp) \
108  (((tsp)->tv_sec == (usp)->tv_sec) ? \
109  ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \
110  ((tsp)->tv_sec cmp (usp)->tv_sec))
111 #define timespecadd(tsp, usp, vsp) \
112  do { \
113  (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
114  (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
115  if ((vsp)->tv_nsec >= 1000000000L) { \
116  (vsp)->tv_sec++; \
117  (vsp)->tv_nsec -= 1000000000L; \
118  } \
119  } while (0)
120 #define timespecsub(tsp, usp, vsp) \
121  do { \
122  (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
123  (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
124  if ((vsp)->tv_nsec < 0) { \
125  (vsp)->tv_sec--; \
126  (vsp)->tv_nsec += 1000000000L; \
127  } \
128  } while (0)
129 
130 /*
131  * Names of the interval timers, and structure
132  * defining a timer setting.
133  */
134 #define ITIMER_REAL 0
135 #define ITIMER_VIRTUAL 1
136 #define ITIMER_PROF 2
137 
138 struct itimerval {
139  struct timeval it_interval; /* timer interval */
140  struct timeval it_value; /* current value */
141 };
142 
143 /*
144  * Getkerninfo clock information structure
145  */
146 struct clockinfo {
147  int hz; /* clock frequency */
148  int tick; /* micro-seconds per hz tick */
149  int tickadj; /* clock skew rate for adjtime() */
150  int stathz; /* statistics clock frequency */
151  int profhz; /* profiling clock frequency */
152 };
153 
154 #define CLOCK_REALTIME 0
155 #define CLOCK_VIRTUAL 1
156 #define CLOCK_PROF 2
157 
158 #define TIMER_RELTIME 0x0 /* relative timer */
159 #define TIMER_ABSTIME 0x1 /* absolute timer */
160 
161 /* --- stuff got cut here - niels --- */
162 
163 #endif /* !_SYS_TIME_H_ */