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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: time.h,v 1.56 2006/06/18 21:09:24 uwe Exp $    */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)time.h      8.5 (Berkeley) 5/4/95
   32  */
   33 
   34 #ifndef _SYS_TIME_H_
   35 #define _SYS_TIME_H_
   36 
   37 #include <sys/featuretest.h>
   38 #include <sys/types.h>
   39 
   40 /*
   41  * Structure returned by gettimeofday(2) system call,
   42  * and used in other calls.
   43  */
   44 struct timeval {
   45         long    tv_sec;         /* seconds */
   46         long    tv_usec;        /* and microseconds */
   47 };
   48 
   49 /*
   50  * Structure defined by POSIX.1b to be like a timeval.
   51  */
   52 struct timespec {
   53         time_t  tv_sec;         /* seconds */
   54         long    tv_nsec;        /* and nanoseconds */
   55 };
   56 
   57 #if defined(_NETBSD_SOURCE)
   58 #define TIMEVAL_TO_TIMESPEC(tv, ts) do {                                \
   59         (ts)->tv_sec = (tv)->tv_sec;                                    \
   60         (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
   61 } while (/*CONSTCOND*/0)
   62 #define TIMESPEC_TO_TIMEVAL(tv, ts) do {                                \
   63         (tv)->tv_sec = (ts)->tv_sec;                                    \
   64         (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
   65 } while (/*CONSTCOND*/0)
   66 
   67 /*
   68  * Note: timezone is obsolete. All timezone handling is now in
   69  * userland. Its just here for back compatibility.
   70  */
   71 struct timezone {
   72         int     tz_minuteswest; /* minutes west of Greenwich */
   73         int     tz_dsttime;     /* type of dst correction */
   74 };
   75 
   76 /* Operations on timevals. */
   77 #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
   78 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
   79 #define timercmp(tvp, uvp, cmp)                                         \
   80         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
   81             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
   82             ((tvp)->tv_sec cmp (uvp)->tv_sec))
   83 #define timeradd(tvp, uvp, vvp)                                         \
   84         do {                                                            \
   85                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
   86                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
   87                 if ((vvp)->tv_usec >= 1000000) {                        \
   88                         (vvp)->tv_sec++;                                \
   89                         (vvp)->tv_usec -= 1000000;                      \
   90                 }                                                       \
   91         } while (/* CONSTCOND */ 0)
   92 #define timersub(tvp, uvp, vvp)                                         \
   93         do {                                                            \
   94                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
   95                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
   96                 if ((vvp)->tv_usec < 0) {                               \
   97                         (vvp)->tv_sec--;                                \
   98                         (vvp)->tv_usec += 1000000;                      \
   99                 }                                                       \
  100         } while (/* CONSTCOND */ 0)
  101 
  102 #ifdef _KERNEL
  103 struct bintime {
  104         time_t  sec;
  105         uint64_t frac;
  106 };
  107 
  108 static __inline void
  109 bintime_addx(struct bintime *bt, uint64_t x)
  110 {
  111         uint64_t u;
  112 
  113         u = bt->frac;
  114         bt->frac += x;
  115         if (u > bt->frac)
  116                 bt->sec++;
  117 }
  118 
  119 static __inline void
  120 bintime_add(struct bintime *bt, const struct bintime *bt2)
  121 {
  122         uint64_t u;
  123 
  124         u = bt->frac;
  125         bt->frac += bt2->frac;
  126         if (u > bt->frac)
  127                 bt->sec++;
  128         bt->sec += bt2->sec;
  129 }
  130 
  131 static __inline void
  132 bintime_sub(struct bintime *bt, const struct bintime *bt2)
  133 {
  134         uint64_t u;
  135 
  136         u = bt->frac;
  137         bt->frac -= bt2->frac;
  138         if (u < bt->frac)
  139                 bt->sec--;
  140         bt->sec -= bt2->sec;
  141 }
  142 
  143 /*-
  144  * Background information:
  145  *
  146  * When converting between timestamps on parallel timescales of differing
  147  * resolutions it is historical and scientific practice to round down rather
  148  * than doing 4/5 rounding.
  149  *
  150  *   The date changes at midnight, not at noon.
  151  *
  152  *   Even at 15:59:59.999999999 it's not four'o'clock.
  153  *
  154  *   time_second ticks after N.999999999 not after N.4999999999
  155  */
  156 
  157 static __inline void
  158 bintime2timespec(const struct bintime *bt, struct timespec *ts)
  159 {
  160 
  161         ts->tv_sec = (/* XXX NetBSD not SUS compliant - MUST FIX */time_t)bt->sec;
  162         ts->tv_nsec =
  163             (long)(((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32);
  164 }
  165 
  166 static __inline void
  167 timespec2bintime(const struct timespec *ts, struct bintime *bt)
  168 {
  169 
  170         bt->sec = ts->tv_sec;
  171         /* 18446744073 = int(2^64 / 1000000000) */
  172         bt->frac = ts->tv_nsec * (uint64_t)18446744073LL; 
  173 }
  174 
  175 static __inline void
  176 bintime2timeval(const struct bintime *bt, struct timeval *tv)
  177 {
  178 
  179         tv->tv_sec = bt->sec;
  180         tv->tv_usec =
  181             (long)(((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32);
  182 }
  183 
  184 static __inline void
  185 timeval2bintime(const struct timeval *tv, struct bintime *bt)
  186 {
  187 
  188         bt->sec = (/* XXX NetBSD not SUS compliant - MUST FIX */time_t)tv->tv_sec;
  189         /* 18446744073709 = int(2^64 / 1000000) */
  190         bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
  191 }
  192 #endif /* _KERNEL */
  193 
  194 /* Operations on timespecs. */
  195 #define timespecclear(tsp)              (tsp)->tv_sec = (tsp)->tv_nsec = 0
  196 #define timespecisset(tsp)              ((tsp)->tv_sec || (tsp)->tv_nsec)
  197 #define timespeccmp(tsp, usp, cmp)                                      \
  198         (((tsp)->tv_sec == (usp)->tv_sec) ?                             \
  199             ((tsp)->tv_nsec cmp (usp)->tv_nsec) :                       \
  200             ((tsp)->tv_sec cmp (usp)->tv_sec))
  201 #define timespecadd(tsp, usp, vsp)                                      \
  202         do {                                                            \
  203                 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;          \
  204                 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;       \
  205                 if ((vsp)->tv_nsec >= 1000000000L) {                    \
  206                         (vsp)->tv_sec++;                                \
  207                         (vsp)->tv_nsec -= 1000000000L;                  \
  208                 }                                                       \
  209         } while (/* CONSTCOND */ 0)
  210 #define timespecsub(tsp, usp, vsp)                                      \
  211         do {                                                            \
  212                 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;          \
  213                 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;       \
  214                 if ((vsp)->tv_nsec < 0) {                               \
  215                         (vsp)->tv_sec--;                                \
  216                         (vsp)->tv_nsec += 1000000000L;                  \
  217                 }                                                       \
  218         } while (/* CONSTCOND */ 0)
  219 #endif /* _NETBSD_SOURCE */
  220 
  221 /*
  222  * Names of the interval timers, and structure
  223  * defining a timer setting.
  224  */
  225 #define ITIMER_REAL     0
  226 #define ITIMER_VIRTUAL  1
  227 #define ITIMER_PROF     2
  228 
  229 struct  itimerval {
  230         struct  timeval it_interval;    /* timer interval */
  231         struct  timeval it_value;       /* current value */
  232 };
  233 
  234 /*
  235  * Structure defined by POSIX.1b to be like a itimerval, but with
  236  * timespecs. Used in the timer_*() system calls.
  237  */
  238 struct  itimerspec {
  239         struct  timespec it_interval;
  240         struct  timespec it_value;
  241 };
  242 
  243 #define CLOCK_REALTIME  0
  244 #define CLOCK_VIRTUAL   1
  245 #define CLOCK_PROF      2
  246 #define CLOCK_MONOTONIC 3
  247 
  248 #define TIMER_RELTIME   0x0     /* relative timer */
  249 #define TIMER_ABSTIME   0x1     /* absolute timer */
  250 
  251 #ifdef _KERNEL
  252 #include <sys/timevar.h>
  253 #else /* !_KERNEL */
  254 #ifndef _STANDALONE
  255 #if (_POSIX_C_SOURCE - 0) >= 200112L || \
  256     (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
  257     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
  258 #include <sys/select.h>
  259 #endif
  260 
  261 #include <sys/cdefs.h>
  262 #include <time.h>
  263 
  264 __BEGIN_DECLS
  265 #if (_POSIX_C_SOURCE - 0) >= 200112L || \
  266     defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
  267 int     getitimer(int, struct itimerval *);
  268 int     gettimeofday(struct timeval * __restrict, void * __restrict);
  269 int     setitimer(int, const struct itimerval * __restrict,
  270             struct itimerval * __restrict);
  271 int     utimes(const char *, const struct timeval [2]);
  272 #endif /* _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE || _NETBSD_SOURCE */
  273 
  274 #if defined(_NETBSD_SOURCE)
  275 int     adjtime(const struct timeval *, struct timeval *);
  276 int     futimes(int, const struct timeval [2]);
  277 int     lutimes(const char *, const struct timeval [2]);
  278 int     settimeofday(const struct timeval * __restrict,
  279             const void * __restrict);
  280 #endif /* _NETBSD_SOURCE */
  281 __END_DECLS
  282 
  283 #endif  /* !_STANDALONE */
  284 #endif /* !_KERNEL */
  285 #endif /* !_SYS_TIME_H_ */

Cache object: f336ef24f80fa154c27d1b3112bcbaa5


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.