1/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_TIME_H
19#define _SYS_TIME_H 1
20
21#include <features.h>
22
23#include <bits/types.h>
24#define __need_time_t
25#include <time.h>
26#define __need_timeval
27#include <bits/time.h>
28
29#include <sys/select.h>
30
31#ifndef __suseconds_t_defined
32typedef __suseconds_t suseconds_t;
33# define __suseconds_t_defined
34#endif
35
36
37__BEGIN_DECLS
38
39#ifdef __USE_GNU
40/* Macros for converting between `struct timeval' and `struct timespec'. */
41# define TIMEVAL_TO_TIMESPEC(tv, ts) { \
42 (ts)->tv_sec = (tv)->tv_sec; \
43 (ts)->tv_nsec = (tv)->tv_usec * 1000; \
44}
45# define TIMESPEC_TO_TIMEVAL(tv, ts) { \
46 (tv)->tv_sec = (ts)->tv_sec; \
47 (tv)->tv_usec = (ts)->tv_nsec / 1000; \
48}
49#endif
50
51
52#ifdef __USE_MISC
53/* Structure crudely representing a timezone.
54 This is obsolete and should never be used. */
55struct timezone
56 {
57 int tz_minuteswest; /* Minutes west of GMT. */
58 int tz_dsttime; /* Nonzero if DST is ever in effect. */
59 };
60
61typedef struct timezone *__restrict __timezone_ptr_t;
62#else
63typedef void *__restrict __timezone_ptr_t;
64#endif
65
66/* Get the current time of day and timezone information,
67 putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled.
68 Returns 0 on success, -1 on errors.
69 NOTE: This form of timezone information is obsolete.
70 Use the functions and variables declared in <time.h> instead. */
71extern int gettimeofday (struct timeval *__restrict __tv,
72 __timezone_ptr_t __tz) __THROW __nonnull ((1));
73
74#ifdef __USE_MISC
75/* Set the current time of day and timezone information.
76 This call is restricted to the super-user. */
77extern int settimeofday (const struct timeval *__tv,
78 const struct timezone *__tz)
79 __THROW;
80
81/* Adjust the current time of day by the amount in DELTA.
82 If OLDDELTA is not NULL, it is filled in with the amount
83 of time adjustment remaining to be done from the last `adjtime' call.
84 This call is restricted to the super-user. */
85extern int adjtime (const struct timeval *__delta,
86 struct timeval *__olddelta) __THROW;
87#endif
88
89
90/* Values for the first argument to `getitimer' and `setitimer'. */
91enum __itimer_which
92 {
93 /* Timers run in real time. */
94 ITIMER_REAL = 0,
95#define ITIMER_REAL ITIMER_REAL
96 /* Timers run only when the process is executing. */
97 ITIMER_VIRTUAL = 1,
98#define ITIMER_VIRTUAL ITIMER_VIRTUAL
99 /* Timers run when the process is executing and when
100 the system is executing on behalf of the process. */
101 ITIMER_PROF = 2
102#define ITIMER_PROF ITIMER_PROF
103 };
104
105/* Type of the second argument to `getitimer' and
106 the second and third arguments `setitimer'. */
107struct itimerval
108 {
109 /* Value to put into `it_value' when the timer expires. */
110 struct timeval it_interval;
111 /* Time to the next timer expiration. */
112 struct timeval it_value;
113 };
114
115#if defined __USE_GNU && !defined __cplusplus
116/* Use the nicer parameter type only in GNU mode and not for C++ since the
117 strict C++ rules prevent the automatic promotion. */
118typedef enum __itimer_which __itimer_which_t;
119#else
120typedef int __itimer_which_t;
121#endif
122
123/* Set *VALUE to the current setting of timer WHICH.
124 Return 0 on success, -1 on errors. */
125extern int getitimer (__itimer_which_t __which,
126 struct itimerval *__value) __THROW;
127
128/* Set the timer WHICH to *NEW. If OLD is not NULL,
129 set *OLD to the old value of timer WHICH.
130 Returns 0 on success, -1 on errors. */
131extern int setitimer (__itimer_which_t __which,
132 const struct itimerval *__restrict __new,
133 struct itimerval *__restrict __old) __THROW;
134
135/* Change the access time of FILE to TVP[0] and the modification time of
136 FILE to TVP[1]. If TVP is a null pointer, use the current time instead.
137 Returns 0 on success, -1 on errors. */
138extern int utimes (const char *__file, const struct timeval __tvp[2])
139 __THROW __nonnull ((1));
140
141#ifdef __USE_MISC
142/* Same as `utimes', but does not follow symbolic links. */
143extern int lutimes (const char *__file, const struct timeval __tvp[2])
144 __THROW __nonnull ((1));
145
146/* Same as `utimes', but takes an open file descriptor instead of a name. */
147extern int futimes (int __fd, const struct timeval __tvp[2]) __THROW;
148#endif
149
150#ifdef __USE_GNU
151/* Change the access time of FILE relative to FD to TVP[0] and the
152 modification time of FILE to TVP[1]. If TVP is a null pointer, use
153 the current time instead. Returns 0 on success, -1 on errors. */
154extern int futimesat (int __fd, const char *__file,
155 const struct timeval __tvp[2]) __THROW;
156#endif
157
158
159#ifdef __USE_MISC
160/* Convenience macros for operations on timevals.
161 NOTE: `timercmp' does not work for >= or <=. */
162# define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
163# define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
164# define timercmp(a, b, CMP) \
165 (((a)->tv_sec == (b)->tv_sec) ? \
166 ((a)->tv_usec CMP (b)->tv_usec) : \
167 ((a)->tv_sec CMP (b)->tv_sec))
168# define timeradd(a, b, result) \
169 do { \
170 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
171 (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
172 if ((result)->tv_usec >= 1000000) \
173 { \
174 ++(result)->tv_sec; \
175 (result)->tv_usec -= 1000000; \
176 } \
177 } while (0)
178# define timersub(a, b, result) \
179 do { \
180 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
181 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
182 if ((result)->tv_usec < 0) { \
183 --(result)->tv_sec; \
184 (result)->tv_usec += 1000000; \
185 } \
186 } while (0)
187#endif /* Misc. */
188
189__END_DECLS
190
191#endif /* sys/time.h */
192