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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)time.h      8.5 (Berkeley) 5/4/95
   30  * $FreeBSD: releng/9.1/sys/sys/time.h 224732 2011-08-09 14:06:50Z jonathan $
   31  */
   32 
   33 #ifndef _SYS_TIME_H_
   34 #define _SYS_TIME_H_
   35 
   36 #include <sys/_timeval.h>
   37 #include <sys/types.h>
   38 #include <sys/timespec.h>
   39 
   40 struct timezone {
   41         int     tz_minuteswest; /* minutes west of Greenwich */
   42         int     tz_dsttime;     /* type of dst correction */
   43 };
   44 #define DST_NONE        0       /* not on dst */
   45 #define DST_USA         1       /* USA style dst */
   46 #define DST_AUST        2       /* Australian style dst */
   47 #define DST_WET         3       /* Western European dst */
   48 #define DST_MET         4       /* Middle European dst */
   49 #define DST_EET         5       /* Eastern European dst */
   50 #define DST_CAN         6       /* Canada */
   51 
   52 #if __BSD_VISIBLE
   53 struct bintime {
   54         time_t  sec;
   55         uint64_t frac;
   56 };
   57 
   58 static __inline void
   59 bintime_addx(struct bintime *bt, uint64_t x)
   60 {
   61         uint64_t u;
   62 
   63         u = bt->frac;
   64         bt->frac += x;
   65         if (u > bt->frac)
   66                 bt->sec++;
   67 }
   68 
   69 static __inline void
   70 bintime_add(struct bintime *bt, const struct bintime *bt2)
   71 {
   72         uint64_t u;
   73 
   74         u = bt->frac;
   75         bt->frac += bt2->frac;
   76         if (u > bt->frac)
   77                 bt->sec++;
   78         bt->sec += bt2->sec;
   79 }
   80 
   81 static __inline void
   82 bintime_sub(struct bintime *bt, const struct bintime *bt2)
   83 {
   84         uint64_t u;
   85 
   86         u = bt->frac;
   87         bt->frac -= bt2->frac;
   88         if (u < bt->frac)
   89                 bt->sec--;
   90         bt->sec -= bt2->sec;
   91 }
   92 
   93 static __inline void
   94 bintime_mul(struct bintime *bt, u_int x)
   95 {
   96         uint64_t p1, p2;
   97 
   98         p1 = (bt->frac & 0xffffffffull) * x;
   99         p2 = (bt->frac >> 32) * x + (p1 >> 32);
  100         bt->sec *= x;
  101         bt->sec += (p2 >> 32);
  102         bt->frac = (p2 << 32) | (p1 & 0xffffffffull);
  103 }
  104 
  105 #define bintime_clear(a)        ((a)->sec = (a)->frac = 0)
  106 #define bintime_isset(a)        ((a)->sec || (a)->frac)
  107 #define bintime_cmp(a, b, cmp)                                          \
  108         (((a)->sec == (b)->sec) ?                                       \
  109             ((a)->frac cmp (b)->frac) :                                 \
  110             ((a)->sec cmp (b)->sec))
  111 
  112 /*-
  113  * Background information:
  114  *
  115  * When converting between timestamps on parallel timescales of differing
  116  * resolutions it is historical and scientific practice to round down rather
  117  * than doing 4/5 rounding.
  118  *
  119  *   The date changes at midnight, not at noon.
  120  *
  121  *   Even at 15:59:59.999999999 it's not four'o'clock.
  122  *
  123  *   time_second ticks after N.999999999 not after N.4999999999
  124  */
  125 
  126 static __inline void
  127 bintime2timespec(const struct bintime *bt, struct timespec *ts)
  128 {
  129 
  130         ts->tv_sec = bt->sec;
  131         ts->tv_nsec = ((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32;
  132 }
  133 
  134 static __inline void
  135 timespec2bintime(const struct timespec *ts, struct bintime *bt)
  136 {
  137 
  138         bt->sec = ts->tv_sec;
  139         /* 18446744073 = int(2^64 / 1000000000) */
  140         bt->frac = ts->tv_nsec * (uint64_t)18446744073LL; 
  141 }
  142 
  143 static __inline void
  144 bintime2timeval(const struct bintime *bt, struct timeval *tv)
  145 {
  146 
  147         tv->tv_sec = bt->sec;
  148         tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32;
  149 }
  150 
  151 static __inline void
  152 timeval2bintime(const struct timeval *tv, struct bintime *bt)
  153 {
  154 
  155         bt->sec = tv->tv_sec;
  156         /* 18446744073709 = int(2^64 / 1000000) */
  157         bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
  158 }
  159 #endif /* __BSD_VISIBLE */
  160 
  161 #ifdef _KERNEL
  162 
  163 /* Operations on timespecs */
  164 #define timespecclear(tvp)      ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
  165 #define timespecisset(tvp)      ((tvp)->tv_sec || (tvp)->tv_nsec)
  166 #define timespeccmp(tvp, uvp, cmp)                                      \
  167         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  168             ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
  169             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  170 #define timespecadd(vvp, uvp)                                           \
  171         do {                                                            \
  172                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
  173                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
  174                 if ((vvp)->tv_nsec >= 1000000000) {                     \
  175                         (vvp)->tv_sec++;                                \
  176                         (vvp)->tv_nsec -= 1000000000;                   \
  177                 }                                                       \
  178         } while (0)
  179 #define timespecsub(vvp, uvp)                                           \
  180         do {                                                            \
  181                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
  182                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
  183                 if ((vvp)->tv_nsec < 0) {                               \
  184                         (vvp)->tv_sec--;                                \
  185                         (vvp)->tv_nsec += 1000000000;                   \
  186                 }                                                       \
  187         } while (0)
  188 
  189 /* Operations on timevals. */
  190 
  191 #define timevalclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  192 #define timevalisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
  193 #define timevalcmp(tvp, uvp, cmp)                                       \
  194         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  195             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  196             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  197 
  198 /* timevaladd and timevalsub are not inlined */
  199 
  200 #endif /* _KERNEL */
  201 
  202 #ifndef _KERNEL                 /* NetBSD/OpenBSD compatible interfaces */
  203 
  204 #define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  205 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
  206 #define timercmp(tvp, uvp, cmp)                                 \
  207         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  208             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  209             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  210 #define timeradd(tvp, uvp, vvp)                                         \
  211         do {                                                            \
  212                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
  213                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
  214                 if ((vvp)->tv_usec >= 1000000) {                        \
  215                         (vvp)->tv_sec++;                                \
  216                         (vvp)->tv_usec -= 1000000;                      \
  217                 }                                                       \
  218         } while (0)
  219 #define timersub(tvp, uvp, vvp)                                         \
  220         do {                                                            \
  221                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
  222                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
  223                 if ((vvp)->tv_usec < 0) {                               \
  224                         (vvp)->tv_sec--;                                \
  225                         (vvp)->tv_usec += 1000000;                      \
  226                 }                                                       \
  227         } while (0)
  228 #endif
  229 
  230 /*
  231  * Names of the interval timers, and structure
  232  * defining a timer setting.
  233  */
  234 #define ITIMER_REAL     0
  235 #define ITIMER_VIRTUAL  1
  236 #define ITIMER_PROF     2
  237 
  238 struct itimerval {
  239         struct  timeval it_interval;    /* timer interval */
  240         struct  timeval it_value;       /* current value */
  241 };
  242 
  243 /*
  244  * Getkerninfo clock information structure
  245  */
  246 struct clockinfo {
  247         int     hz;             /* clock frequency */
  248         int     tick;           /* micro-seconds per hz tick */
  249         int     spare;
  250         int     stathz;         /* statistics clock frequency */
  251         int     profhz;         /* profiling clock frequency */
  252 };
  253 
  254 /* These macros are also in time.h. */
  255 #ifndef CLOCK_REALTIME
  256 #define CLOCK_REALTIME  0
  257 #define CLOCK_VIRTUAL   1
  258 #define CLOCK_PROF      2
  259 #define CLOCK_MONOTONIC 4
  260 #define CLOCK_UPTIME    5               /* FreeBSD-specific. */
  261 #define CLOCK_UPTIME_PRECISE    7       /* FreeBSD-specific. */
  262 #define CLOCK_UPTIME_FAST       8       /* FreeBSD-specific. */
  263 #define CLOCK_REALTIME_PRECISE  9       /* FreeBSD-specific. */
  264 #define CLOCK_REALTIME_FAST     10      /* FreeBSD-specific. */
  265 #define CLOCK_MONOTONIC_PRECISE 11      /* FreeBSD-specific. */
  266 #define CLOCK_MONOTONIC_FAST    12      /* FreeBSD-specific. */
  267 #define CLOCK_SECOND    13              /* FreeBSD-specific. */
  268 #define CLOCK_THREAD_CPUTIME_ID 14
  269 #endif
  270 
  271 #ifndef TIMER_ABSTIME
  272 #define TIMER_RELTIME   0x0     /* relative timer */
  273 #define TIMER_ABSTIME   0x1     /* absolute timer */
  274 #endif
  275 
  276 #ifdef _KERNEL
  277 
  278 /*
  279  * Kernel to clock driver interface.
  280  */
  281 void    inittodr(time_t base);
  282 void    resettodr(void);
  283 
  284 extern time_t   time_second;
  285 extern time_t   time_uptime;
  286 extern struct bintime boottimebin;
  287 extern struct timeval boottime;
  288 
  289 /*
  290  * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
  291  *
  292  * Functions without the "get" prefix returns the best timestamp
  293  * we can produce in the given format.
  294  *
  295  * "bin"   == struct bintime  == seconds + 64 bit fraction of seconds.
  296  * "nano"  == struct timespec == seconds + nanoseconds.
  297  * "micro" == struct timeval  == seconds + microseconds.
  298  *              
  299  * Functions containing "up" returns time relative to boot and
  300  * should be used for calculating time intervals.
  301  *
  302  * Functions without "up" returns GMT time.
  303  *
  304  * Functions with the "get" prefix returns a less precise result
  305  * much faster than the functions without "get" prefix and should
  306  * be used where a precision of 1/hz seconds is acceptable or where
  307  * performance is priority. (NB: "precision", _not_ "resolution" !) 
  308  * 
  309  */
  310 
  311 void    binuptime(struct bintime *bt);
  312 void    nanouptime(struct timespec *tsp);
  313 void    microuptime(struct timeval *tvp);
  314 
  315 void    bintime(struct bintime *bt);
  316 void    nanotime(struct timespec *tsp);
  317 void    microtime(struct timeval *tvp);
  318 
  319 void    getbinuptime(struct bintime *bt);
  320 void    getnanouptime(struct timespec *tsp);
  321 void    getmicrouptime(struct timeval *tvp);
  322 
  323 void    getbintime(struct bintime *bt);
  324 void    getnanotime(struct timespec *tsp);
  325 void    getmicrotime(struct timeval *tvp);
  326 
  327 /* Other functions */
  328 int     itimerdecr(struct itimerval *itp, int usec);
  329 int     itimerfix(struct timeval *tv);
  330 int     ppsratecheck(struct timeval *, int *, int);
  331 int     ratecheck(struct timeval *, const struct timeval *);
  332 void    timevaladd(struct timeval *t1, const struct timeval *t2);
  333 void    timevalsub(struct timeval *t1, const struct timeval *t2);
  334 int     tvtohz(struct timeval *tv);
  335 #else /* !_KERNEL */
  336 #include <time.h>
  337 
  338 #include <sys/cdefs.h>
  339 #include <sys/select.h>
  340 
  341 __BEGIN_DECLS
  342 int     setitimer(int, const struct itimerval *, struct itimerval *);
  343 int     utimes(const char *, const struct timeval *);
  344 
  345 #if __BSD_VISIBLE
  346 int     adjtime(const struct timeval *, struct timeval *);
  347 int     futimes(int, const struct timeval *);
  348 int     futimesat(int, const char *, const struct timeval [2]);
  349 int     lutimes(const char *, const struct timeval *);
  350 int     settimeofday(const struct timeval *, const struct timezone *);
  351 #endif
  352 
  353 #if __XSI_VISIBLE
  354 int     getitimer(int, struct itimerval *);
  355 int     gettimeofday(struct timeval *, struct timezone *);
  356 #endif
  357 
  358 __END_DECLS
  359 
  360 #endif /* !_KERNEL */
  361 
  362 #endif /* !_SYS_TIME_H_ */

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