Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
7# include <linux/seqlock.h>
8#endif
9
10#ifndef _STRUCT_TIMESPEC
11#define _STRUCT_TIMESPEC
12struct timespec {
13 time_t tv_sec; /* seconds */
14 long tv_nsec; /* nanoseconds */
15};
16#endif
17
18struct timeval {
19 time_t tv_sec; /* seconds */
20 suseconds_t tv_usec; /* microseconds */
21};
22
23struct timezone {
24 int tz_minuteswest; /* minutes west of Greenwich */
25 int tz_dsttime; /* type of dst correction */
26};
27
28#ifdef __KERNEL__
29
30/* Parameters used to convert the timespec values: */
31#define MSEC_PER_SEC 1000L
32#define USEC_PER_SEC 1000000L
33#define NSEC_PER_SEC 1000000000L
34#define NSEC_PER_USEC 1000L
35
36static inline int timespec_equal(struct timespec *a, struct timespec *b)
37{
38 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
39}
40
41/*
42 * lhs < rhs: return <0
43 * lhs == rhs: return 0
44 * lhs > rhs: return >0
45 */
46static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs)
47{
48 if (lhs->tv_sec < rhs->tv_sec)
49 return -1;
50 if (lhs->tv_sec > rhs->tv_sec)
51 return 1;
52 return lhs->tv_nsec - rhs->tv_nsec;
53}
54
55static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs)
56{
57 if (lhs->tv_sec < rhs->tv_sec)
58 return -1;
59 if (lhs->tv_sec > rhs->tv_sec)
60 return 1;
61 return lhs->tv_usec - rhs->tv_usec;
62}
63
64extern unsigned long mktime(const unsigned int year, const unsigned int mon,
65 const unsigned int day, const unsigned int hour,
66 const unsigned int min, const unsigned int sec);
67
68extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
69
70/*
71 * Returns true if the timespec is norm, false if denorm:
72 */
73#define timespec_valid(ts) \
74 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
75
76extern struct timespec xtime;
77extern struct timespec wall_to_monotonic;
78extern seqlock_t xtime_lock;
79
80static inline unsigned long get_seconds(void)
81{
82 return xtime.tv_sec;
83}
84
85struct timespec current_kernel_time(void);
86
87#define CURRENT_TIME (current_kernel_time())
88#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
89
90extern void do_gettimeofday(struct timeval *tv);
91extern int do_settimeofday(struct timespec *tv);
92extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
93#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
94extern long do_utimes(int dfd, char __user *filename, struct timeval *times);
95struct itimerval;
96extern int do_setitimer(int which, struct itimerval *value,
97 struct itimerval *ovalue);
98extern unsigned int alarm_setitimer(unsigned int seconds);
99extern int do_getitimer(int which, struct itimerval *value);
100extern void getnstimeofday(struct timespec *tv);
101
102extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
103
104/**
105 * timespec_to_ns - Convert timespec to nanoseconds
106 * @ts: pointer to the timespec variable to be converted
107 *
108 * Returns the scalar nanosecond representation of the timespec
109 * parameter.
110 */
111static inline s64 timespec_to_ns(const struct timespec *ts)
112{
113 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
114}
115
116/**
117 * timeval_to_ns - Convert timeval to nanoseconds
118 * @ts: pointer to the timeval variable to be converted
119 *
120 * Returns the scalar nanosecond representation of the timeval
121 * parameter.
122 */
123static inline s64 timeval_to_ns(const struct timeval *tv)
124{
125 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
126 tv->tv_usec * NSEC_PER_USEC;
127}
128
129/**
130 * ns_to_timespec - Convert nanoseconds to timespec
131 * @nsec: the nanoseconds value to be converted
132 *
133 * Returns the timespec representation of the nsec parameter.
134 */
135extern struct timespec ns_to_timespec(const s64 nsec);
136
137/**
138 * ns_to_timeval - Convert nanoseconds to timeval
139 * @nsec: the nanoseconds value to be converted
140 *
141 * Returns the timeval representation of the nsec parameter.
142 */
143extern struct timeval ns_to_timeval(const s64 nsec);
144
145#endif /* __KERNEL__ */
146
147#define NFDBITS __NFDBITS
148
149#define FD_SETSIZE __FD_SETSIZE
150#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
151#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
152#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
153#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
154
155/*
156 * Names of the interval timers, and structure
157 * defining a timer setting:
158 */
159#define ITIMER_REAL 0
160#define ITIMER_VIRTUAL 1
161#define ITIMER_PROF 2
162
163struct itimerspec {
164 struct timespec it_interval; /* timer period */
165 struct timespec it_value; /* timer expiration */
166};
167
168struct itimerval {
169 struct timeval it_interval; /* timer interval */
170 struct timeval it_value; /* current value */
171};
172
173/*
174 * The IDs of the various system clocks (for POSIX.1b interval timers):
175 */
176#define CLOCK_REALTIME 0
177#define CLOCK_MONOTONIC 1
178#define CLOCK_PROCESS_CPUTIME_ID 2
179#define CLOCK_THREAD_CPUTIME_ID 3
180
181/*
182 * The IDs of various hardware clocks:
183 */
184#define CLOCK_SGI_CYCLE 10
185#define MAX_CLOCKS 16
186#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
187#define CLOCKS_MONO CLOCK_MONOTONIC
188
189/*
190 * The various flags for setting POSIX.1b interval timers:
191 */
192#define TIMER_ABSTIME 0x01
193
194#endif