The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)time.h      8.5 (Berkeley) 5/4/95
   34  * $FreeBSD: src/sys/sys/time.h,v 1.8.2.2 1999/09/05 08:23:04 peter Exp $
   35  */
   36 
   37 #ifndef _SYS_TIME_H_
   38 #define _SYS_TIME_H_
   39 
   40 #include <sys/types.h>
   41 
   42 /*
   43  * Structure returned by gettimeofday(2) system call,
   44  * and used in other calls.
   45  */
   46 struct timeval {
   47         long    tv_sec;         /* seconds */
   48         long    tv_usec;        /* and microseconds */
   49 };
   50 
   51 /*
   52  * Structure defined by POSIX.4 to be like a timeval.
   53  */
   54 struct timespec {
   55         time_t  tv_sec;         /* seconds */
   56         long    tv_nsec;        /* and nanoseconds */
   57 };
   58 
   59 #define TIMEVAL_TO_TIMESPEC(tv, ts) {                                   \
   60         (ts)->tv_sec = (tv)->tv_sec;                                    \
   61         (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
   62 }
   63 #define TIMESPEC_TO_TIMEVAL(tv, ts) {                                   \
   64         (tv)->tv_sec = (ts)->tv_sec;                                    \
   65         (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
   66 }
   67 
   68 struct timezone {
   69         int     tz_minuteswest; /* minutes west of Greenwich */
   70         int     tz_dsttime;     /* type of dst correction */
   71 };
   72 #define DST_NONE        0       /* not on dst */
   73 #define DST_USA         1       /* USA style dst */
   74 #define DST_AUST        2       /* Australian style dst */
   75 #define DST_WET         3       /* Western European dst */
   76 #define DST_MET         4       /* Middle European dst */
   77 #define DST_EET         5       /* Eastern European dst */
   78 #define DST_CAN         6       /* Canada */
   79 
   80 /* Operations on timevals. */
   81 #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
   82 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
   83 #define timercmp(tvp, uvp, cmp)                                         \
   84         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
   85             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
   86             ((tvp)->tv_sec cmp (uvp)->tv_sec))
   87 #ifndef KERNEL          /* use timevaladd/timevalsub in kernel */
   88 /* NetBSD/OpenBSD compatable interfaces */
   89 #define timeradd(tvp, uvp, vvp)                                         \
   90         do {                                                            \
   91                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
   92                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
   93                 if ((vvp)->tv_usec >= 1000000) {                        \
   94                         (vvp)->tv_sec++;                                \
   95                         (vvp)->tv_usec -= 1000000;                      \
   96                 }                                                       \
   97         } while (0)
   98 #define timersub(tvp, uvp, vvp)                                         \
   99         do {                                                            \
  100                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
  101                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
  102                 if ((vvp)->tv_usec < 0) {                               \
  103                         (vvp)->tv_sec--;                                \
  104                         (vvp)->tv_usec += 1000000;                      \
  105                 }                                                       \
  106         } while (0)
  107 #endif
  108 
  109 /*
  110  * Names of the interval timers, and structure
  111  * defining a timer setting.
  112  */
  113 #define ITIMER_REAL     0
  114 #define ITIMER_VIRTUAL  1
  115 #define ITIMER_PROF     2
  116 
  117 struct  itimerval {
  118         struct  timeval it_interval;    /* timer interval */
  119         struct  timeval it_value;       /* current value */
  120 };
  121 
  122 /*
  123  * Getkerninfo clock information structure
  124  */
  125 struct clockinfo {
  126         int     hz;             /* clock frequency */
  127         int     tick;           /* micro-seconds per hz tick */
  128         int     stathz;         /* statistics clock frequency */
  129         int     profhz;         /* profiling clock frequency */
  130 };
  131 
  132 #ifdef KERNEL
  133 int     itimerfix __P((struct timeval *tv));
  134 int     itimerdecr __P((struct itimerval *itp, int usec));
  135 void    microtime __P((struct timeval *tv));
  136 void    timevaladd __P((struct timeval *, struct timeval *));
  137 void    timevalsub __P((struct timeval *, struct timeval *));
  138 #else /* !KERNEL */
  139 #include <time.h>
  140 
  141 #ifndef _POSIX_SOURCE
  142 #include <sys/cdefs.h>
  143 
  144 __BEGIN_DECLS
  145 int     adjtime __P((const struct timeval *, struct timeval *));
  146 int     getitimer __P((int, struct itimerval *));
  147 int     gettimeofday __P((struct timeval *, struct timezone *));
  148 int     setitimer __P((int, const struct itimerval *, struct itimerval *));
  149 int     settimeofday __P((const struct timeval *, const struct timezone *));
  150 int     utimes __P((const char *, const struct timeval *));
  151 __END_DECLS
  152 #endif /* !POSIX */
  153 
  154 #endif /* !KERNEL */
  155 
  156 #endif /* !_SYS_TIME_H_ */

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