time.h

Go to the documentation of this file.

#ifndef _UAPI_LINUX_TIME_H
#define _UAPI_LINUX_TIME_H

#include <linux/types.h>


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

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

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

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 */
};

/*
 * 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 IDs of various hardware clocks:
 */
#define CLOCK_SGI_CYCLE         10
#define MAX_CLOCKS          16
#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 */