summary refs log tree commit diff
path: root/time/sys/time.h
blob: 12389fb81571c975d0f9715c85537adbccc6f8c1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/* Copyright (C) 1991,92,93,94,96,97,98,99,2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef _SYS_TIME_H
#define _SYS_TIME_H	1

#include <features.h>

#include <time.h>
#include <sys/select.h>

#define __need_timeval
#include <bits/time.h>

#ifndef __suseconds_t_defined
typedef __suseconds_t suseconds_t;
# define __suseconds_t_defined
#endif


__BEGIN_DECLS

/* Macros for converting between `struct timeval' and `struct timespec'.  */
#define TIMEVAL_TO_TIMESPEC(tv, ts) {                                   \
        (ts)->tv_sec = (tv)->tv_sec;                                    \
        (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
}
#define TIMESPEC_TO_TIMEVAL(tv, ts) {                                   \
        (tv)->tv_sec = (ts)->tv_sec;                                    \
        (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
}


/* Structure crudely representing a timezone.
   This is obsolete and should never be used.  */
struct timezone
  {
    int tz_minuteswest;		/* Minutes west of GMT.  */
    int tz_dsttime;		/* Nonzero if DST is ever in effect.  */
  };

#if defined __USE_GNU || defined __USE_BSD
typedef struct timezone *__restrict __timezone_ptr_t;
#else
typedef void *__restrict __timezone_ptr_t;
#endif

/* Get the current time of day and timezone information,
   putting it into *TV and *TZ.  If TZ is NULL, *TZ is not filled.
   Returns 0 on success, -1 on errors.
   NOTE: This form of timezone information is obsolete.
   Use the functions and variables declared in <time.h> instead.  */
extern int gettimeofday (struct timeval *__restrict __tv,
			 __timezone_ptr_t __tz) __THROW;

/* Set the current time of day and timezone information.
   This call is restricted to the super-user.  */
extern int settimeofday (__const struct timeval *__tv,
			 __const struct timezone *__tz) __THROW;

/* Adjust the current time of day by the amount in DELTA.
   If OLDDELTA is not NULL, it is filled in with the amount
   of time adjustment remaining to be done from the last `adjtime' call.
   This call is restricted to the super-user.  */
extern int adjtime (__const struct timeval *__delta,
		    struct timeval *__olddelta) __THROW;


/* Values for the first argument to `getitimer' and `setitimer'.  */
enum __itimer_which
  {
    /* Timers run in real time.  */
    ITIMER_REAL = 0,
#define ITIMER_REAL ITIMER_REAL
    /* Timers run only when the process is executing.  */
    ITIMER_VIRTUAL = 1,
#define ITIMER_VIRTUAL ITIMER_VIRTUAL
    /* Timers run when the process is executing and when
       the system is executing on behalf of the process.  */
    ITIMER_PROF = 2
#define ITIMER_PROF ITIMER_PROF
  };

/* Type of the second argument to `getitimer' and
   the second and third arguments `setitimer'.  */
struct itimerval
  {
    /* Value to put into `it_value' when the timer expires.  */
    struct timeval it_interval;
    /* Time to the next timer expiration.  */
    struct timeval it_value;
  };

#ifdef __USE_GNU
typedef enum __itimer_which __itimer_which_t;
#else
typedef int __itimer_which_t;
#endif

/* Set *VALUE to the current setting of timer WHICH.
   Return 0 on success, -1 on errors.  */
extern int getitimer (__itimer_which_t __which,
		      struct itimerval *__value) __THROW;

/* Set the timer WHICH to *NEW.  If OLD is not NULL,
   set *OLD to the old value of timer WHICH.
   Returns 0 on success, -1 on errors.  */
extern int setitimer (__itimer_which_t __which,
		      __const struct itimerval *__restrict __new,
		      struct itimerval *__restrict __old) __THROW;

/* Change the access time of FILE to TVP[0] and
   the modification time of FILE to TVP[1].  */
extern int utimes (__const char *__file, __const struct timeval __tvp[2])
     __THROW;


/* Convenience macros for operations on timevals.
   NOTE: `timercmp' does not work for >= or <=.  */
#define	timerisset(tvp)		((tvp)->tv_sec || (tvp)->tv_usec)
#define	timerclear(tvp)		((tvp)->tv_sec = (tvp)->tv_usec = 0)
#define	timercmp(a, b, CMP) 						      \
  (((a)->tv_sec == (b)->tv_sec) ? 					      \
   ((a)->tv_usec CMP (b)->tv_usec) : 					      \
   ((a)->tv_sec CMP (b)->tv_sec))
#define	timeradd(a, b, result)						      \
  do {									      \
    (result)->tv_sec = (a)->tv_sec + (b)->tv_sec;			      \
    (result)->tv_usec = (a)->tv_usec + (b)->tv_usec;			      \
    if ((result)->tv_usec >= 1000000)					      \
      {									      \
	++(result)->tv_sec;						      \
	(result)->tv_usec -= 1000000;					      \
      }									      \
  } while (0)
#define	timersub(a, b, result)						      \
  do {									      \
    (result)->tv_sec = (a)->tv_sec - (b)->tv_sec;			      \
    (result)->tv_usec = (a)->tv_usec - (b)->tv_usec;			      \
    if ((result)->tv_usec < 0) {					      \
      --(result)->tv_sec;						      \
      (result)->tv_usec += 1000000;					      \
    }									      \
  } while (0)

__END_DECLS

#endif /* sys/time.h */