time.h 3.1 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _LINUX_TIME_H
  3. #define _LINUX_TIME_H
  4. # include <linux/cache.h>
  5. # include <linux/math64.h>
  6. # include <linux/time64.h>
  7. extern struct timezone sys_tz;
  8. int get_timespec64(struct timespec64 *ts,
  9. const struct __kernel_timespec __user *uts);
  10. int put_timespec64(const struct timespec64 *ts,
  11. struct __kernel_timespec __user *uts);
  12. int get_itimerspec64(struct itimerspec64 *it,
  13. const struct __kernel_itimerspec __user *uit);
  14. int put_itimerspec64(const struct itimerspec64 *it,
  15. struct __kernel_itimerspec __user *uit);
  16. extern time64_t mktime64(const unsigned int year, const unsigned int mon,
  17. const unsigned int day, const unsigned int hour,
  18. const unsigned int min, const unsigned int sec);
  19. #ifdef CONFIG_POSIX_TIMERS
  20. extern void clear_itimer(void);
  21. #else
  22. static inline void clear_itimer(void) {}
  23. #endif
  24. extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags);
  25. /*
  26. * Similar to the struct tm in userspace <time.h>, but it needs to be here so
  27. * that the kernel source is self contained.
  28. */
  29. struct tm {
  30. /*
  31. * the number of seconds after the minute, normally in the range
  32. * 0 to 59, but can be up to 60 to allow for leap seconds
  33. */
  34. int tm_sec;
  35. /* the number of minutes after the hour, in the range 0 to 59*/
  36. int tm_min;
  37. /* the number of hours past midnight, in the range 0 to 23 */
  38. int tm_hour;
  39. /* the day of the month, in the range 1 to 31 */
  40. int tm_mday;
  41. /* the number of months since January, in the range 0 to 11 */
  42. int tm_mon;
  43. /* the number of years since 1900 */
  44. long tm_year;
  45. /* the number of days since Sunday, in the range 0 to 6 */
  46. int tm_wday;
  47. /* the number of days since January 1, in the range 0 to 365 */
  48. int tm_yday;
  49. };
  50. void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
  51. # include <linux/time32.h>
  52. static inline bool itimerspec64_valid(const struct itimerspec64 *its)
  53. {
  54. if (!timespec64_valid(&(its->it_interval)) ||
  55. !timespec64_valid(&(its->it_value)))
  56. return false;
  57. return true;
  58. }
  59. /**
  60. * time_after32 - compare two 32-bit relative times
  61. * @a: the time which may be after @b
  62. * @b: the time which may be before @a
  63. *
  64. * time_after32(a, b) returns true if the time @a is after time @b.
  65. * time_before32(b, a) returns true if the time @b is before time @a.
  66. *
  67. * Similar to time_after(), compare two 32-bit timestamps for relative
  68. * times. This is useful for comparing 32-bit seconds values that can't
  69. * be converted to 64-bit values (e.g. due to disk format or wire protocol
  70. * issues) when it is known that the times are less than 68 years apart.
  71. */
  72. #define time_after32(a, b) ((s32)((u32)(b) - (u32)(a)) < 0)
  73. #define time_before32(b, a) time_after32(a, b)
  74. /**
  75. * time_between32 - check if a 32-bit timestamp is within a given time range
  76. * @t: the time which may be within [l,h]
  77. * @l: the lower bound of the range
  78. * @h: the higher bound of the range
  79. *
  80. * time_before32(t, l, h) returns true if @l <= @t <= @h. All operands are
  81. * treated as 32-bit integers.
  82. *
  83. * Equivalent to !(time_before32(@t, @l) || time_after32(@t, @h)).
  84. */
  85. #define time_between32(t, l, h) ((u32)(h) - (u32)(l) >= (u32)(t) - (u32)(l))
  86. # include <vdso/time.h>
  87. #endif