| 1 | #ifndef _LINUX_TIME64_H
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| 2 | #define _LINUX_TIME64_H
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| 3 |
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| 4 | #include <linux/math64.h>
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| 5 |
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| 6 | typedef __s64 time64_t;
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| 7 | typedef __u64 timeu64_t;
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| 8 |
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| 9 | struct timespec64 {
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| 10 | time64_t tv_sec; /* seconds */
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| 11 | long tv_nsec; /* nanoseconds */
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| 12 | };
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| 13 |
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| 14 | struct itimerspec64 {
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| 15 | struct timespec64 it_interval;
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| 16 | struct timespec64 it_value;
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| 17 | };
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| 18 |
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| 19 | /* Parameters used to convert the timespec values: */
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| 20 | #define MSEC_PER_SEC 1000L
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| 21 | #define USEC_PER_MSEC 1000L
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| 22 | #define NSEC_PER_USEC 1000L
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| 23 | #define NSEC_PER_MSEC 1000000L
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| 24 | #define USEC_PER_SEC 1000000L
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| 25 | #define NSEC_PER_SEC 1000000000L
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| 26 | #define FSEC_PER_SEC 1000000000000000LL
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| 27 |
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| 28 | /* Located here for timespec[64]_valid_strict */
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| 29 | #define TIME64_MAX ((s64)~((u64)1 << 63))
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| 30 | #define KTIME_MAX ((s64)~((u64)1 << 63))
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| 31 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
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| 32 |
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| 33 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
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| 34 |
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| 35 | static inline struct timespec64 timespec64_add(struct timespec64 lhs,
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| 36 | struct timespec64 rhs)
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| 37 | {
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| 38 | struct timespec64 ts_delta;
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| 39 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
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| 40 | lhs.tv_nsec + rhs.tv_nsec);
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| 41 | return ts_delta;
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| 42 | }
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| 43 |
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| 44 | /*
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| 45 | * sub = lhs - rhs, in normalized form
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| 46 | */
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| 47 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
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| 48 | struct timespec64 rhs)
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| 49 | {
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| 50 | struct timespec64 ts_delta;
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| 51 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
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| 52 | lhs.tv_nsec - rhs.tv_nsec);
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| 53 | return ts_delta;
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| 54 | }
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| 55 |
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| 56 | /*
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| 57 | * Returns true if the timespec64 is norm, false if denorm:
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| 58 | */
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| 59 | static inline bool timespec64_valid(const struct timespec64 *ts)
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| 60 | {
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| 61 | /* Dates before 1970 are bogus */
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| 62 | if (ts->tv_sec < 0)
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| 63 | return false;
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| 64 | /* Can't have more nanoseconds then a second */
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| 65 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
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| 66 | return false;
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| 67 | return true;
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| 68 | }
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| 69 |
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| 70 | static inline bool timespec64_valid_strict(const struct timespec64 *ts)
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| 71 | {
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| 72 | if (!timespec64_valid(ts))
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| 73 | return false;
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| 74 | /* Disallow values that could overflow ktime_t */
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| 75 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
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| 76 | return false;
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| 77 | return true;
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| 78 | }
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| 79 |
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| 80 | /**
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| 81 | * timespec64_to_ns - Convert timespec64 to nanoseconds
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| 82 | * @ts: pointer to the timespec64 variable to be converted
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| 83 | *
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| 84 | * Returns the scalar nanosecond representation of the timespec64
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| 85 | * parameter.
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| 86 | */
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| 87 | static inline s64 timespec64_to_ns(const struct timespec64 *ts)
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| 88 | {
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| 89 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * ns_to_timespec64 - Convert nanoseconds to timespec64
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| 94 | * @nsec: the nanoseconds value to be converted
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| 95 | *
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| 96 | * Returns the timespec64 representation of the nsec parameter.
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| 97 | */
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| 98 | extern struct timespec64 ns_to_timespec64(const s64 nsec);
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| 99 |
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| 100 | #endif
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