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_MSEC 1000L
33#define NSEC_PER_USEC 1000L
34#define NSEC_PER_MSEC 1000000L
35#define USEC_PER_SEC 1000000L
36#define NSEC_PER_SEC 1000000000L
37#define FSEC_PER_SEC 1000000000000000L
38
39static inline int timespec_equal(struct timespec *a, struct timespec *b)
40{
41 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
42}
43
44/*
45 * lhs < rhs: return <0
46 * lhs == rhs: return 0
47 * lhs > rhs: return >0
48 */
49static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs)
50{
51 if (lhs->tv_sec < rhs->tv_sec)
52 return -1;
53 if (lhs->tv_sec > rhs->tv_sec)
54 return 1;
55 return lhs->tv_nsec - rhs->tv_nsec;
56}
57
58static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs)
59{
60 if (lhs->tv_sec < rhs->tv_sec)
61 return -1;
62 if (lhs->tv_sec > rhs->tv_sec)
63 return 1;
64 return lhs->tv_usec - rhs->tv_usec;
65}
66
67extern unsigned long mktime(const unsigned int year, const unsigned int mon,
68 const unsigned int day, const unsigned int hour,
69 const unsigned int min, const unsigned int sec);
70
71extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
72
73/*
74 * Returns true if the timespec is norm, false if denorm:
75 */
76#define timespec_valid(ts) \
77 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
78
79extern struct timespec xtime;
80extern struct timespec wall_to_monotonic;
81extern seqlock_t xtime_lock;
82
83void timekeeping_init(void);
84
85static inline unsigned long get_seconds(void)
86{
87 return xtime.tv_sec;
88}
89
90struct timespec current_kernel_time(void);
91
92#define CURRENT_TIME (current_kernel_time())
93#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
94
95extern void do_gettimeofday(struct timeval *tv);
96extern int do_settimeofday(struct timespec *tv);
97extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
98#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
99extern long do_utimes(int dfd, char __user *filename, struct timeval *times);
100struct itimerval;
101extern int do_setitimer(int which, struct itimerval *value,
102 struct itimerval *ovalue);
103extern unsigned int alarm_setitimer(unsigned int seconds);
104extern int do_getitimer(int which, struct itimerval *value);
105extern void getnstimeofday(struct timespec *tv);
106
107extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
108extern int timekeeping_is_continuous(void);
109
110/**
111 * timespec_to_ns - Convert timespec to nanoseconds
112 * @ts: pointer to the timespec variable to be converted
113 *
114 * Returns the scalar nanosecond representation of the timespec
115 * parameter.
116 */
117static inline s64 timespec_to_ns(const struct timespec *ts)
118{
119 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
120}
121
122/**
123 * timeval_to_ns - Convert timeval to nanoseconds
124 * @ts: pointer to the timeval variable to be converted
125 *
126 * Returns the scalar nanosecond representation of the timeval
127 * parameter.
128 */
129static inline s64 timeval_to_ns(const struct timeval *tv)
130{
131 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
132 tv->tv_usec * NSEC_PER_USEC;
133}
134
135/**
136 * ns_to_timespec - Convert nanoseconds to timespec
137 * @nsec: the nanoseconds value to be converted
138 *
139 * Returns the timespec representation of the nsec parameter.
140 */
141extern struct timespec ns_to_timespec(const s64 nsec);
142
143/**
144 * ns_to_timeval - Convert nanoseconds to timeval
145 * @nsec: the nanoseconds value to be converted
146 *
147 * Returns the timeval representation of the nsec parameter.
148 */
149extern struct timeval ns_to_timeval(const s64 nsec);
150
151/**
152 * timespec_add_ns - Adds nanoseconds to a timespec
153 * @a: pointer to timespec to be incremented
154 * @ns: unsigned nanoseconds value to be added
155 */
156static inline void timespec_add_ns(struct timespec *a, u64 ns)
157{
158 ns += a->tv_nsec;
159 while(unlikely(ns >= NSEC_PER_SEC)) {
160 ns -= NSEC_PER_SEC;
161 a->tv_sec++;
162 }
163 a->tv_nsec = ns;
164}
165#endif /* __KERNEL__ */
166
167#define NFDBITS __NFDBITS
168
169#define FD_SETSIZE __FD_SETSIZE
170#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
171#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
172#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
173#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
174
175/*
176 * Names of the interval timers, and structure
177 * defining a timer setting:
178 */
179#define ITIMER_REAL 0
180#define ITIMER_VIRTUAL 1
181#define ITIMER_PROF 2
182
183struct itimerspec {
184 struct timespec it_interval; /* timer period */
185 struct timespec it_value; /* timer expiration */
186};
187
188struct itimerval {
189 struct timeval it_interval; /* timer interval */
190 struct timeval it_value; /* current value */
191};
192
193/*
194 * The IDs of the various system clocks (for POSIX.1b interval timers):
195 */
196#define CLOCK_REALTIME 0
197#define CLOCK_MONOTONIC 1
198#define CLOCK_PROCESS_CPUTIME_ID 2
199#define CLOCK_THREAD_CPUTIME_ID 3
200
201/*
202 * The IDs of various hardware clocks:
203 */
204#define CLOCK_SGI_CYCLE 10
205#define MAX_CLOCKS 16
206#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
207#define CLOCKS_MONO CLOCK_MONOTONIC
208
209/*
210 * The various flags for setting POSIX.1b interval timers:
211 */
212#define TIMER_ABSTIME 0x01
213
214#endif