Quelle time.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_TIME_H
#define _UAPI_LINUX_TIME_H

#include <linux/types.h>
#include <linux/time_types.h>

#ifndef __KERNEL__
#ifndef _STRUCT_TIMESPEC
#define _STRUCT_TIMESPEC
struct timespec {
__kernel_old_time_t tv_sec;  /* seconds */
long   tv_nsec; /* nanoseconds */
};
#endif

struct timeval {
__kernel_old_time_t tv_sec;  /* seconds */
__kernel_suseconds_t tv_usec; /* microseconds */
};

struct itimerspec {
struct timespec it_interval;/* timer period */
struct timespec it_value; /* timer expiration */
};

struct itimerval {
struct timeval it_interval;/* timer interval */
struct timeval it_value; /* current value */
};
#endif

struct timezone {
int tz_minuteswest; /* minutes west of Greenwich */
int tz_dsttime; /* type of dst correction */
};

/*
* Names of the interval timers, and structure
* defining a timer setting:
*/
#define ITIMER_REAL  0
#define ITIMER_VIRTUAL  1
#define ITIMER_PROF  2

/*
* The IDs of the various system clocks (for POSIX.1b interval timers):
*/
#define CLOCK_REALTIME   0
#define CLOCK_MONOTONIC   1
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID  3
#define CLOCK_MONOTONIC_RAW  4
#define CLOCK_REALTIME_COARSE  5
#define CLOCK_MONOTONIC_COARSE  6
#define CLOCK_BOOTTIME   7
#define CLOCK_REALTIME_ALARM  8
#define CLOCK_BOOTTIME_ALARM  9
/*
* The driver implementing this got removed. The clock ID is kept as a
* place holder. Do not reuse!
*/
#define CLOCK_SGI_CYCLE   10
#define CLOCK_TAI   11

#define MAX_CLOCKS   16

/*
* AUX clock support. AUXiliary clocks are dynamically configured by
* enabling a clock ID. These clock can be steered independently of the
* core timekeeper. The kernel can support up to 8 auxiliary clocks, but
* the actual limit depends on eventual architecture constraints vs. VDSO.
*/
#define CLOCK_AUX   MAX_CLOCKS
#define MAX_AUX_CLOCKS   8
#define CLOCK_AUX_LAST   (CLOCK_AUX + MAX_AUX_CLOCKS - 1)

#define CLOCKS_MASK   (CLOCK_REALTIME | CLOCK_MONOTONIC)
#define CLOCKS_MONO   CLOCK_MONOTONIC

/*
* The various flags for setting POSIX.1b interval timers:
*/
#define TIMER_ABSTIME   0x01

#endif /* _UAPI_LINUX_TIME_H */

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