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