1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _UAPI_LINUX_TIME_H 3 #define _UAPI_LINUX_TIME_H 4 5 #include <linux/types.h> 6 7 8 #ifndef _STRUCT_TIMESPEC 9 #define _STRUCT_TIMESPEC 10 struct timespec { 11 __kernel_time_t tv_sec; /* seconds */ 12 long tv_nsec; /* nanoseconds */ 13 }; 14 #endif 15 16 struct timeval { 17 __kernel_time_t tv_sec; /* seconds */ 18 __kernel_suseconds_t tv_usec; /* microseconds */ 19 }; 20 21 struct timezone { 22 int tz_minuteswest; /* minutes west of Greenwich */ 23 int tz_dsttime; /* type of dst correction */ 24 }; 25 26 27 /* 28 * Names of the interval timers, and structure 29 * defining a timer setting: 30 */ 31 #define ITIMER_REAL 0 32 #define ITIMER_VIRTUAL 1 33 #define ITIMER_PROF 2 34 35 struct itimerspec { 36 struct timespec it_interval; /* timer period */ 37 struct timespec it_value; /* timer expiration */ 38 }; 39 40 struct itimerval { 41 struct timeval it_interval; /* timer interval */ 42 struct timeval it_value; /* current value */ 43 }; 44 45 /* 46 * The IDs of the various system clocks (for POSIX.1b interval timers): 47 */ 48 #define CLOCK_REALTIME 0 49 #define CLOCK_MONOTONIC 1 50 #define CLOCK_PROCESS_CPUTIME_ID 2 51 #define CLOCK_THREAD_CPUTIME_ID 3 52 #define CLOCK_MONOTONIC_RAW 4 53 #define CLOCK_REALTIME_COARSE 5 54 #define CLOCK_MONOTONIC_COARSE 6 55 #define CLOCK_BOOTTIME 7 56 #define CLOCK_REALTIME_ALARM 8 57 #define CLOCK_BOOTTIME_ALARM 9 58 /* 59 * The driver implementing this got removed. The clock ID is kept as a 60 * place holder. Do not reuse! 61 */ 62 #define CLOCK_SGI_CYCLE 10 63 #define CLOCK_TAI 11 64 65 #define MAX_CLOCKS 16 66 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 67 #define CLOCKS_MONO CLOCK_MONOTONIC 68 69 /* 70 * The various flags for setting POSIX.1b interval timers: 71 */ 72 #define TIMER_ABSTIME 0x01 73 74 #endif /* _UAPI_LINUX_TIME_H */ 75