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/cache.h>
8# include <linux/seqlock.h>
9# include <linux/math64.h>
10#endif
11
12#ifndef _STRUCT_TIMESPEC
13#define _STRUCT_TIMESPEC
14struct timespec {
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
17};
18#endif
19
20struct timeval {
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
23};
24
25struct timezone {
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
28};
29
30#ifdef __KERNEL__
31
32extern struct timezone sys_tz;
33
34/* Parameters used to convert the timespec values: */
35#define MSEC_PER_SEC 1000L
36#define USEC_PER_MSEC 1000L
37#define NSEC_PER_USEC 1000L
38#define NSEC_PER_MSEC 1000000L
39#define USEC_PER_SEC 1000000L
40#define NSEC_PER_SEC 1000000000L
41#define FSEC_PER_SEC 1000000000000000L
42
43#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44
45static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
47{
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
49}
50
51/*
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
55 */
56static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
57{
58 if (lhs->tv_sec < rhs->tv_sec)
59 return -1;
60 if (lhs->tv_sec > rhs->tv_sec)
61 return 1;
62 return lhs->tv_nsec - rhs->tv_nsec;
63}
64
65static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
66{
67 if (lhs->tv_sec < rhs->tv_sec)
68 return -1;
69 if (lhs->tv_sec > rhs->tv_sec)
70 return 1;
71 return lhs->tv_usec - rhs->tv_usec;
72}
73
74extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 const unsigned int day, const unsigned int hour,
76 const unsigned int min, const unsigned int sec);
77
78extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
79extern struct timespec timespec_add_safe(const struct timespec lhs,
80 const struct timespec rhs);
81
82/*
83 * sub = lhs - rhs, in normalized form
84 */
85static inline struct timespec timespec_sub(struct timespec lhs,
86 struct timespec rhs)
87{
88 struct timespec ts_delta;
89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 lhs.tv_nsec - rhs.tv_nsec);
91 return ts_delta;
92}
93
94/*
95 * Returns true if the timespec is norm, false if denorm:
96 */
97#define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
99
100extern struct timespec xtime;
101extern struct timespec wall_to_monotonic;
102extern seqlock_t xtime_lock;
103
104extern unsigned long read_persistent_clock(void);
105extern int update_persistent_clock(struct timespec now);
106extern int no_sync_cmos_clock __read_mostly;
107void timekeeping_init(void);
108extern int timekeeping_suspended;
109
110unsigned long get_seconds(void);
111struct timespec current_kernel_time(void);
112
113#define CURRENT_TIME (current_kernel_time())
114#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
115
116extern void do_gettimeofday(struct timeval *tv);
117extern int do_settimeofday(struct timespec *tv);
118extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
119#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
120extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
121struct itimerval;
122extern int do_setitimer(int which, struct itimerval *value,
123 struct itimerval *ovalue);
124extern unsigned int alarm_setitimer(unsigned int seconds);
125extern int do_getitimer(int which, struct itimerval *value);
126extern void getnstimeofday(struct timespec *tv);
127extern void getrawmonotonic(struct timespec *ts);
128extern void getboottime(struct timespec *ts);
129extern void monotonic_to_bootbased(struct timespec *ts);
130
131extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
132extern int timekeeping_valid_for_hres(void);
133extern void update_wall_time(void);
134extern void update_xtime_cache(u64 nsec);
135
136struct tms;
137extern void do_sys_times(struct tms *);
138
139/**
140 * timespec_to_ns - Convert timespec to nanoseconds
141 * @ts: pointer to the timespec variable to be converted
142 *
143 * Returns the scalar nanosecond representation of the timespec
144 * parameter.
145 */
146static inline s64 timespec_to_ns(const struct timespec *ts)
147{
148 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
149}
150
151/**
152 * timeval_to_ns - Convert timeval to nanoseconds
153 * @ts: pointer to the timeval variable to be converted
154 *
155 * Returns the scalar nanosecond representation of the timeval
156 * parameter.
157 */
158static inline s64 timeval_to_ns(const struct timeval *tv)
159{
160 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
161 tv->tv_usec * NSEC_PER_USEC;
162}
163
164/**
165 * ns_to_timespec - Convert nanoseconds to timespec
166 * @nsec: the nanoseconds value to be converted
167 *
168 * Returns the timespec representation of the nsec parameter.
169 */
170extern struct timespec ns_to_timespec(const s64 nsec);
171
172/**
173 * ns_to_timeval - Convert nanoseconds to timeval
174 * @nsec: the nanoseconds value to be converted
175 *
176 * Returns the timeval representation of the nsec parameter.
177 */
178extern struct timeval ns_to_timeval(const s64 nsec);
179
180/**
181 * timespec_add_ns - Adds nanoseconds to a timespec
182 * @a: pointer to timespec to be incremented
183 * @ns: unsigned nanoseconds value to be added
184 *
185 * This must always be inlined because its used from the x86-64 vdso,
186 * which cannot call other kernel functions.
187 */
188static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
189{
190 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
191 a->tv_nsec = ns;
192}
193#endif /* __KERNEL__ */
194
195#define NFDBITS __NFDBITS
196
197#define FD_SETSIZE __FD_SETSIZE
198#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
199#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
200#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
201#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
202
203/*
204 * Names of the interval timers, and structure
205 * defining a timer setting:
206 */
207#define ITIMER_REAL 0
208#define ITIMER_VIRTUAL 1
209#define ITIMER_PROF 2
210
211struct itimerspec {
212 struct timespec it_interval; /* timer period */
213 struct timespec it_value; /* timer expiration */
214};
215
216struct itimerval {
217 struct timeval it_interval; /* timer interval */
218 struct timeval it_value; /* current value */
219};
220
221/*
222 * The IDs of the various system clocks (for POSIX.1b interval timers):
223 */
224#define CLOCK_REALTIME 0
225#define CLOCK_MONOTONIC 1
226#define CLOCK_PROCESS_CPUTIME_ID 2
227#define CLOCK_THREAD_CPUTIME_ID 3
228#define CLOCK_MONOTONIC_RAW 4
229
230/*
231 * The IDs of various hardware clocks:
232 */
233#define CLOCK_SGI_CYCLE 10
234#define MAX_CLOCKS 16
235#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
236#define CLOCKS_MONO CLOCK_MONOTONIC
237
238/*
239 * The various flags for setting POSIX.1b interval timers:
240 */
241#define TIMER_ABSTIME 0x01
242
243#endif