4 #include <linux/types.h>
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
12 #ifndef _STRUCT_TIMESPEC
13 #define _STRUCT_TIMESPEC
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
32 extern struct timezone sys_tz;
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
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
45 static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
58 if (lhs->tv_sec < rhs->tv_sec)
60 if (lhs->tv_sec > rhs->tv_sec)
62 return lhs->tv_nsec - rhs->tv_nsec;
65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
67 if (lhs->tv_sec < rhs->tv_sec)
69 if (lhs->tv_sec > rhs->tv_sec)
71 return lhs->tv_usec - rhs->tv_usec;
74 extern 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);
78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
79 extern struct timespec timespec_add_safe(const struct timespec lhs,
80 const struct timespec rhs);
83 * sub = lhs - rhs, in normalized form
85 static inline struct timespec timespec_sub(struct timespec lhs,
88 struct timespec ts_delta;
89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 lhs.tv_nsec - rhs.tv_nsec);
95 * Returns true if the timespec is norm, false if denorm:
97 #define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
100 extern struct timespec xtime;
101 extern struct timespec wall_to_monotonic;
102 extern seqlock_t xtime_lock;
104 extern unsigned long read_persistent_clock(void);
105 extern int update_persistent_clock(struct timespec now);
106 extern int no_sync_cmos_clock __read_mostly;
107 void timekeeping_init(void);
108 extern int timekeeping_suspended;
110 unsigned long get_seconds(void);
111 struct timespec current_kernel_time(void);
113 #define CURRENT_TIME (current_kernel_time())
114 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
116 extern void do_gettimeofday(struct timeval *tv);
117 extern int do_settimeofday(struct timespec *tv);
118 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
119 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
120 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
122 extern int do_setitimer(int which, struct itimerval *value,
123 struct itimerval *ovalue);
124 extern unsigned int alarm_setitimer(unsigned int seconds);
125 extern int do_getitimer(int which, struct itimerval *value);
126 extern void getnstimeofday(struct timespec *tv);
127 extern void getrawmonotonic(struct timespec *ts);
128 extern void getboottime(struct timespec *ts);
129 extern void monotonic_to_bootbased(struct timespec *ts);
131 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
132 extern int timekeeping_valid_for_hres(void);
133 extern void update_wall_time(void);
134 extern void update_xtime_cache(u64 nsec);
137 extern void do_sys_times(struct tms *);
140 * timespec_to_ns - Convert timespec to nanoseconds
141 * @ts: pointer to the timespec variable to be converted
143 * Returns the scalar nanosecond representation of the timespec
146 static inline s64 timespec_to_ns(const struct timespec *ts)
148 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
152 * timeval_to_ns - Convert timeval to nanoseconds
153 * @ts: pointer to the timeval variable to be converted
155 * Returns the scalar nanosecond representation of the timeval
158 static inline s64 timeval_to_ns(const struct timeval *tv)
160 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
161 tv->tv_usec * NSEC_PER_USEC;
165 * ns_to_timespec - Convert nanoseconds to timespec
166 * @nsec: the nanoseconds value to be converted
168 * Returns the timespec representation of the nsec parameter.
170 extern struct timespec ns_to_timespec(const s64 nsec);
173 * ns_to_timeval - Convert nanoseconds to timeval
174 * @nsec: the nanoseconds value to be converted
176 * Returns the timeval representation of the nsec parameter.
178 extern struct timeval ns_to_timeval(const s64 nsec);
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
185 * This must always be inlined because its used from the x86-64 vdso,
186 * which cannot call other kernel functions.
188 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
190 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
193 #endif /* __KERNEL__ */
195 #define NFDBITS __NFDBITS
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)
204 * Names of the interval timers, and structure
205 * defining a timer setting:
207 #define ITIMER_REAL 0
208 #define ITIMER_VIRTUAL 1
209 #define ITIMER_PROF 2
212 struct timespec it_interval; /* timer period */
213 struct timespec it_value; /* timer expiration */
217 struct timeval it_interval; /* timer interval */
218 struct timeval it_value; /* current value */
222 * The IDs of the various system clocks (for POSIX.1b interval timers):
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
231 * The IDs of various hardware clocks:
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
239 * The various flags for setting POSIX.1b interval timers:
241 #define TIMER_ABSTIME 0x01