FreeBSD/Linux Kernel Cross Reference
sys/sys/time.h

     /*
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)time.h      8.5 (Berkeley) 5/4/95
     * $FreeBSD: src/sys/sys/time.h,v 1.8.2.2 1999/09/05 08:23:04 peter Exp $
     */
    
    #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.
     */
    struct timespec {
            time_t  tv_sec;         /* seconds */
            long    tv_nsec;        /* and nanoseconds */
    };
    
    #define TIMEVAL_TO_TIMESPEC(tv, ts) {                                   \
            (ts)->tv_sec = (tv)->tv_sec;                                    \
            (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
    }
    #define TIMESPEC_TO_TIMEVAL(tv, ts) {                                   \
            (tv)->tv_sec = (ts)->tv_sec;                                    \
            (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
    }
    
    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. */
    #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
    #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
    #define timercmp(tvp, uvp, cmp)                                         \
            (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
                ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
                ((tvp)->tv_sec cmp (uvp)->tv_sec))
    #ifndef KERNEL          /* use timevaladd/timevalsub in kernel */
    /* NetBSD/OpenBSD compatable interfaces */
    #define timeradd(tvp, uvp, vvp)                                         \
            do {                                                            \
                    (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
                    (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
                    if ((vvp)->tv_usec >= 1000000) {                        \
                            (vvp)->tv_sec++;                                \
                            (vvp)->tv_usec -= 1000000;                      \
                    }                                                       \
            } while (0)
    #define timersub(tvp, uvp, vvp)                                         \
            do {                                                            \
                   (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
                   (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
                   if ((vvp)->tv_usec < 0) {                               \
                           (vvp)->tv_sec--;                                \
                           (vvp)->tv_usec += 1000000;                      \
                   }                                                       \
           } while (0)
   #endif
   
   /*
    * Names of the interval timers, and structure
    * defining a timer setting.
    */
   #define ITIMER_REAL     0
   #define ITIMER_VIRTUAL  1
   #define ITIMER_PROF     2
   
   struct  itimerval {
           struct  timeval it_interval;    /* timer interval */
           struct  timeval it_value;       /* current value */
   };
   
   /*
    * 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 */
   };
   
   #ifdef KERNEL
   int     itimerfix __P((struct timeval *tv));
   int     itimerdecr __P((struct itimerval *itp, int usec));
   void    microtime __P((struct timeval *tv));
   void    timevaladd __P((struct timeval *, struct timeval *));
   void    timevalsub __P((struct timeval *, struct timeval *));
   #else /* !KERNEL */
   #include <time.h>
   
   #ifndef _POSIX_SOURCE
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     adjtime __P((const struct timeval *, struct timeval *));
   int     getitimer __P((int, struct itimerval *));
   int     gettimeofday __P((struct timeval *, struct timezone *));
   int     setitimer __P((int, const struct itimerval *, struct itimerval *));
   int     settimeofday __P((const struct timeval *, const struct timezone *));
   int     utimes __P((const char *, const struct timeval *));
   __END_DECLS
   #endif /* !POSIX */
   
   #endif /* !KERNEL */
   
   #endif /* !_SYS_TIME_H_ */

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