/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef _SYS_TIME_H_
#define _SYS_TIME_H_

#include <sys/types.h>

/*
 * Structure returned by gettimeofday(2) system call,
 * and used in other calls.
 */
struct timeval {
    long    tv_sec;         /* seconds */
    long    tv_usec;        /* and microseconds */
};

/*
 * Structure defined by POSIX.4 to be like a timeval but with nanoseconds
 * instead of microseconds.  Silly on a PDP-11 but keeping the names the
 * same makes life simpler than changing the names.
*/
struct timespec {
    time_t tv_sec;          /* seconds */
    long   tv_nsec;         /* and nanoseconds */
};

struct timezone {
    int     tz_minuteswest; /* minutes west of Greenwich */
    int     tz_dsttime;     /* type of dst correction */
};
#define DST_NONE    0       /* not on dst */
#define DST_USA     1       /* USA style dst */
#define DST_AUST    2       /* Australian style dst */
#define DST_WET     3       /* Western European dst */
#define DST_MET     4       /* Middle European dst */
#define DST_EET     5       /* Eastern European dst */
#define DST_CAN     6       /* Canada */

/*
 * Operations on timevals.
 *
 * NB: timercmp does not work for >= or <=.
 */
#define timerisset(tvp)     ((tvp)->tv_sec || (tvp)->tv_usec)
#define timercmp(tvp, uvp, cmp) \
                            ((tvp)->tv_sec cmp (uvp)->tv_sec || \
                             (tvp)->tv_sec == (uvp)->tv_sec && \
                             (tvp)->tv_usec cmp (uvp)->tv_usec)
#define timerclear(tvp)     (tvp)->tv_sec = (tvp)->tv_usec = 0

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

struct  k_itimerval {
    long    it_interval;            /* timer interval */
    long    it_value;               /* current value */
};

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

#ifdef KERNEL
/*
 * Round up a proposed time value to a minimal resolution of the clock.
 */
int itimerfix (struct timeval *tv);

/*
 * Add and subtract routines for timevals.
 */
void timevaladd (struct timeval *t1, struct timeval *t2);
void timevalsub (struct timeval *t1, struct timeval *t2);

/*
 * Compute number of hz until specified time.
 */
int hzto (struct timeval *tv);

#else
#include <time.h>

int gettimeofday (struct timeval *tv, struct timezone *tz);
int utimes (const char *filename, const struct timeval times[2]);
int getitimer (int which, struct itimerval *curr_value);
int setitimer (int which, const struct itimerval *new_value,
           struct itimerval *old_value);
int getpriority (int which, int who);
int setpriority (int which, int who, int prio);
char *tztab (int zone, int dst);

#endif

/*
 * Getkerninfo clock information structure
 */
struct clockinfo {
    int     hz;         /* clock frequency */
    int     tick;       /* micro-seconds per hz tick */
    int     stathz;     /* statistics clock frequency */
    int     profhz;     /* profiling clock frequency */
};

extern unsigned int msec();
#endif  /* !_SYS_TIME_H_ */