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 /*      $NetBSD: time.h,v 1.62 2008/07/15 16:18:09 christos 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 = 0L
   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 /*
  103  * hide bintime for _STANDALONE because this header is used for hpcboot.exe,
  104  * which is built with compilers which don't recognize LL suffix.
  105  *      http://mail-index.NetBSD.org/tech-userlevel/2008/02/27/msg000181.html
  106  */
  107 #if !defined(_STANDALONE)
  108 struct bintime {
  109         time_t  sec;
  110         uint64_t frac;
  111 };
  112 
  113 static __inline void
  114 bintime_addx(struct bintime *bt, uint64_t x)
  115 {
  116         uint64_t u;
  117 
  118         u = bt->frac;
  119         bt->frac += x;
  120         if (u > bt->frac)
  121                 bt->sec++;
  122 }
  123 
  124 static __inline void
  125 bintime_add(struct bintime *bt, const struct bintime *bt2)
  126 {
  127         uint64_t u;
  128 
  129         u = bt->frac;
  130         bt->frac += bt2->frac;
  131         if (u > bt->frac)
  132                 bt->sec++;
  133         bt->sec += bt2->sec;
  134 }
  135 
  136 static __inline void
  137 bintime_sub(struct bintime *bt, const struct bintime *bt2)
  138 {
  139         uint64_t u;
  140 
  141         u = bt->frac;
  142         bt->frac -= bt2->frac;
  143         if (u < bt->frac)
  144                 bt->sec--;
  145         bt->sec -= bt2->sec;
  146 }
  147 
  148 /*-
  149  * Background information:
  150  *
  151  * When converting between timestamps on parallel timescales of differing
  152  * resolutions it is historical and scientific practice to round down rather
  153  * than doing 4/5 rounding.
  154  *
  155  *   The date changes at midnight, not at noon.
  156  *
  157  *   Even at 15:59:59.999999999 it's not four'o'clock.
  158  *
  159  *   time_second ticks after N.999999999 not after N.4999999999
  160  */
  161 
  162 static __inline void
  163 bintime2timespec(const struct bintime *bt, struct timespec *ts)
  164 {
  165 
  166         ts->tv_sec = bt->sec;
  167         ts->tv_nsec =
  168             (long)(((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32);
  169 }
  170 
  171 static __inline void
  172 timespec2bintime(const struct timespec *ts, struct bintime *bt)
  173 {
  174 
  175         bt->sec = ts->tv_sec;
  176         /* 18446744073 = int(2^64 / 1000000000) */
  177         bt->frac = ts->tv_nsec * (uint64_t)18446744073LL; 
  178 }
  179 
  180 static __inline void
  181 bintime2timeval(const struct bintime *bt, struct timeval *tv)
  182 {
  183 
  184         tv->tv_sec = bt->sec;
  185         tv->tv_usec =
  186             (long)(((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32);
  187 }
  188 
  189 static __inline void
  190 timeval2bintime(const struct timeval *tv, struct bintime *bt)
  191 {
  192 
  193         bt->sec = (/* XXX NetBSD not SUS compliant - MUST FIX */time_t)tv->tv_sec;
  194         /* 18446744073709 = int(2^64 / 1000000) */
  195         bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
  196 }
  197 #endif /* !defined(_STANDALONE) */
  198 
  199 /* Operations on timespecs. */
  200 #define timespecclear(tsp)      (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L)
  201 #define timespecisset(tsp)      ((tsp)->tv_sec || (tsp)->tv_nsec)
  202 #define timespeccmp(tsp, usp, cmp)                                      \
  203         (((tsp)->tv_sec == (usp)->tv_sec) ?                             \
  204             ((tsp)->tv_nsec cmp (usp)->tv_nsec) :                       \
  205             ((tsp)->tv_sec cmp (usp)->tv_sec))
  206 #define timespecadd(tsp, usp, vsp)                                      \
  207         do {                                                            \
  208                 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;          \
  209                 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;       \
  210                 if ((vsp)->tv_nsec >= 1000000000L) {                    \
  211                         (vsp)->tv_sec++;                                \
  212                         (vsp)->tv_nsec -= 1000000000L;                  \
  213                 }                                                       \
  214         } while (/* CONSTCOND */ 0)
  215 #define timespecsub(tsp, usp, vsp)                                      \
  216         do {                                                            \
  217                 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;          \
  218                 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;       \
  219                 if ((vsp)->tv_nsec < 0) {                               \
  220                         (vsp)->tv_sec--;                                \
  221                         (vsp)->tv_nsec += 1000000000L;                  \
  222                 }                                                       \
  223         } while (/* CONSTCOND */ 0)
  224 #define timespec2ns(x) (((uint64_t)(x)->tv_sec) * 1000000000L + (x)->tv_nsec)
  225 #endif /* _NETBSD_SOURCE */
  226 
  227 /*
  228  * Names of the interval timers, and structure
  229  * defining a timer setting.
  230  */
  231 #define ITIMER_REAL     0
  232 #define ITIMER_VIRTUAL  1
  233 #define ITIMER_PROF     2
  234 
  235 struct  itimerval {
  236         struct  timeval it_interval;    /* timer interval */
  237         struct  timeval it_value;       /* current value */
  238 };
  239 
  240 /*
  241  * Structure defined by POSIX.1b to be like a itimerval, but with
  242  * timespecs. Used in the timer_*() system calls.
  243  */
  244 struct  itimerspec {
  245         struct  timespec it_interval;
  246         struct  timespec it_value;
  247 };
  248 
  249 #define CLOCK_REALTIME  0
  250 #define CLOCK_VIRTUAL   1
  251 #define CLOCK_PROF      2
  252 #define CLOCK_MONOTONIC 3
  253 
  254 #define TIMER_RELTIME   0x0     /* relative timer */
  255 #define TIMER_ABSTIME   0x1     /* absolute timer */
  256 
  257 #ifdef _KERNEL
  258 #include <sys/timevar.h>
  259 #else /* !_KERNEL */
  260 #ifndef _STANDALONE
  261 #if (_POSIX_C_SOURCE - 0) >= 200112L || \
  262     (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
  263     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
  264 #include <sys/select.h>
  265 #endif
  266 
  267 #include <sys/cdefs.h>
  268 #include <time.h>
  269 
  270 __BEGIN_DECLS
  271 #if (_POSIX_C_SOURCE - 0) >= 200112L || \
  272     defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
  273 int     getitimer(int, struct itimerval *);
  274 int     gettimeofday(struct timeval * __restrict, void *__restrict);
  275 int     setitimer(int, const struct itimerval * __restrict,
  276             struct itimerval * __restrict);
  277 int     utimes(const char *, const struct timeval [2]);
  278 #endif /* _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE || _NETBSD_SOURCE */
  279 
  280 #if defined(_NETBSD_SOURCE)
  281 int     adjtime(const struct timeval *, struct timeval *);
  282 int     futimes(int, const struct timeval [2]);
  283 int     lutimes(const char *, const struct timeval [2]);
  284 int     settimeofday(const struct timeval * __restrict,
  285             const void *__restrict);
  286 #endif /* _NETBSD_SOURCE */
  287 __END_DECLS
  288 
  289 #endif  /* !_STANDALONE */
  290 #endif /* !_KERNEL */
  291 #endif /* !_SYS_TIME_H_ */

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