Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_TIME_H |
| 2 | #define _LINUX_TIME_H |
| 3 | |
| 4 | #include <linux/types.h> |
| 5 | |
| 6 | #ifdef __KERNEL__ |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 7 | # include <linux/seqlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #endif |
| 9 | |
| 10 | #ifndef _STRUCT_TIMESPEC |
| 11 | #define _STRUCT_TIMESPEC |
| 12 | struct timespec { |
| 13 | time_t tv_sec; /* seconds */ |
| 14 | long tv_nsec; /* nanoseconds */ |
| 15 | }; |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 16 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | struct timeval { |
| 19 | time_t tv_sec; /* seconds */ |
| 20 | suseconds_t tv_usec; /* microseconds */ |
| 21 | }; |
| 22 | |
| 23 | struct timezone { |
| 24 | int tz_minuteswest; /* minutes west of Greenwich */ |
| 25 | int tz_dsttime; /* type of dst correction */ |
| 26 | }; |
| 27 | |
| 28 | #ifdef __KERNEL__ |
| 29 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 30 | /* Parameters used to convert the timespec values: */ |
Vojtech Pavlik | 05ebb76 | 2006-06-26 13:58:20 +0200 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 39 | static inline int timespec_equal(struct timespec *a, struct timespec *b) |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 40 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 42 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 44 | /* |
| 45 | * lhs < rhs: return <0 |
| 46 | * lhs == rhs: return 0 |
| 47 | * lhs > rhs: return >0 |
| 48 | */ |
Rolf Eike Beer | 77adbfb | 2007-02-10 01:45:49 -0800 | [diff] [blame] | 49 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 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 | |
Rolf Eike Beer | 77adbfb | 2007-02-10 01:45:49 -0800 | [diff] [blame] | 58 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 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 | |
Ingo Molnar | f481890 | 2006-01-09 20:52:23 -0800 | [diff] [blame] | 67 | extern 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 | |
| 71 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 73 | /* |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 74 | * sub = lhs - rhs, in normalized form |
| 75 | */ |
| 76 | static inline struct timespec timespec_sub(struct timespec lhs, |
| 77 | struct timespec rhs) |
| 78 | { |
| 79 | struct timespec ts_delta; |
| 80 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, |
| 81 | lhs.tv_nsec - rhs.tv_nsec); |
| 82 | return ts_delta; |
| 83 | } |
| 84 | |
| 85 | /* |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 86 | * Returns true if the timespec is norm, false if denorm: |
| 87 | */ |
| 88 | #define timespec_valid(ts) \ |
Chris Wright | bd3f8f2 | 2006-01-31 19:10:23 -0800 | [diff] [blame] | 89 | (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | extern struct timespec xtime; |
| 92 | extern struct timespec wall_to_monotonic; |
Eric Dumazet | 5809f9d | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 93 | extern seqlock_t xtime_lock __attribute__((weak)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
John Stultz | 411187f | 2007-02-16 01:27:30 -0800 | [diff] [blame] | 95 | extern unsigned long read_persistent_clock(void); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 96 | void timekeeping_init(void); |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | static inline unsigned long get_seconds(void) |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 99 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | return xtime.tv_sec; |
| 101 | } |
| 102 | |
| 103 | struct timespec current_kernel_time(void); |
| 104 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 105 | #define CURRENT_TIME (current_kernel_time()) |
| 106 | #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | extern void do_gettimeofday(struct timeval *tv); |
| 109 | extern int do_settimeofday(struct timespec *tv); |
| 110 | extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 111 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
Ulrich Drepper | 1c710c8 | 2007-05-08 00:33:25 -0700 | [diff] [blame^] | 112 | extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | struct itimerval; |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 114 | extern int do_setitimer(int which, struct itimerval *value, |
| 115 | struct itimerval *ovalue); |
Thomas Gleixner | c08b8a4 | 2006-03-25 03:06:33 -0800 | [diff] [blame] | 116 | extern unsigned int alarm_setitimer(unsigned int seconds); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | extern int do_getitimer(int which, struct itimerval *value); |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 118 | extern void getnstimeofday(struct timespec *tv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 121 | extern int timekeeping_is_continuous(void); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 122 | extern void update_wall_time(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 124 | /** |
| 125 | * timespec_to_ns - Convert timespec to nanoseconds |
| 126 | * @ts: pointer to the timespec variable to be converted |
| 127 | * |
| 128 | * Returns the scalar nanosecond representation of the timespec |
| 129 | * parameter. |
| 130 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 131 | static inline s64 timespec_to_ns(const struct timespec *ts) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 132 | { |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 133 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /** |
| 137 | * timeval_to_ns - Convert timeval to nanoseconds |
| 138 | * @ts: pointer to the timeval variable to be converted |
| 139 | * |
| 140 | * Returns the scalar nanosecond representation of the timeval |
| 141 | * parameter. |
| 142 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 143 | static inline s64 timeval_to_ns(const struct timeval *tv) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 144 | { |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 145 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 146 | tv->tv_usec * NSEC_PER_USEC; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * ns_to_timespec - Convert nanoseconds to timespec |
| 151 | * @nsec: the nanoseconds value to be converted |
| 152 | * |
| 153 | * Returns the timespec representation of the nsec parameter. |
| 154 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 155 | extern struct timespec ns_to_timespec(const s64 nsec); |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 156 | |
| 157 | /** |
| 158 | * ns_to_timeval - Convert nanoseconds to timeval |
| 159 | * @nsec: the nanoseconds value to be converted |
| 160 | * |
| 161 | * Returns the timeval representation of the nsec parameter. |
| 162 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 163 | extern struct timeval ns_to_timeval(const s64 nsec); |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 164 | |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 165 | /** |
| 166 | * timespec_add_ns - Adds nanoseconds to a timespec |
| 167 | * @a: pointer to timespec to be incremented |
| 168 | * @ns: unsigned nanoseconds value to be added |
| 169 | */ |
| 170 | static inline void timespec_add_ns(struct timespec *a, u64 ns) |
| 171 | { |
| 172 | ns += a->tv_nsec; |
| 173 | while(unlikely(ns >= NSEC_PER_SEC)) { |
| 174 | ns -= NSEC_PER_SEC; |
| 175 | a->tv_sec++; |
| 176 | } |
| 177 | a->tv_nsec = ns; |
| 178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | #endif /* __KERNEL__ */ |
| 180 | |
| 181 | #define NFDBITS __NFDBITS |
| 182 | |
| 183 | #define FD_SETSIZE __FD_SETSIZE |
| 184 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) |
| 185 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) |
| 186 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) |
| 187 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) |
| 188 | |
| 189 | /* |
| 190 | * Names of the interval timers, and structure |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 191 | * defining a timer setting: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | */ |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 193 | #define ITIMER_REAL 0 |
| 194 | #define ITIMER_VIRTUAL 1 |
| 195 | #define ITIMER_PROF 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 197 | struct itimerspec { |
| 198 | struct timespec it_interval; /* timer period */ |
| 199 | struct timespec it_value; /* timer expiration */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | }; |
| 201 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 202 | struct itimerval { |
| 203 | struct timeval it_interval; /* timer interval */ |
| 204 | struct timeval it_value; /* current value */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | }; |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | /* |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 208 | * The IDs of the various system clocks (for POSIX.1b interval timers): |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | */ |
Ingo Molnar | 1ad106c | 2006-01-09 20:52:25 -0800 | [diff] [blame] | 210 | #define CLOCK_REALTIME 0 |
| 211 | #define CLOCK_MONOTONIC 1 |
| 212 | #define CLOCK_PROCESS_CPUTIME_ID 2 |
| 213 | #define CLOCK_THREAD_CPUTIME_ID 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | /* |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 216 | * The IDs of various hardware clocks: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | */ |
Ingo Molnar | 1ad106c | 2006-01-09 20:52:25 -0800 | [diff] [blame] | 218 | #define CLOCK_SGI_CYCLE 10 |
| 219 | #define MAX_CLOCKS 16 |
| 220 | #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) |
| 221 | #define CLOCKS_MONO CLOCK_MONOTONIC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 224 | * The various flags for setting POSIX.1b interval timers: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | */ |
Ingo Molnar | 1ad106c | 2006-01-09 20:52:25 -0800 | [diff] [blame] | 226 | #define TIMER_ABSTIME 0x01 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | #endif |