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. 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: src/sys/sys/time.h,v 1.42 1999/12/29 04:24:48 peter Exp $
   31  */
   32 
   33 #ifndef _SYS_TIME_H_
   34 #define _SYS_TIME_H_
   35 
   36 #ifndef _SYS_TYPES_H_
   37 #include <sys/types.h>
   38 #endif
   39 
   40 #include <sys/_timespec.h>
   41 #include <sys/_timeval.h>
   42 #include <sys/select.h>
   43 
   44 #define TIMEVAL_TO_TIMESPEC(tv, ts)                                     \
   45         do {                                                            \
   46                 (ts)->tv_sec = (tv)->tv_sec;                            \
   47                 (ts)->tv_nsec = (tv)->tv_usec * 1000;                   \
   48         } while (0)
   49 #define TIMESPEC_TO_TIMEVAL(tv, ts)                                     \
   50         do {                                                            \
   51                 (tv)->tv_sec = (ts)->tv_sec;                            \
   52                 (tv)->tv_usec = (ts)->tv_nsec / 1000;                   \
   53         } while (0)
   54 
   55 struct timezone {
   56         int     tz_minuteswest; /* minutes west of Greenwich */
   57         int     tz_dsttime;     /* type of dst correction */
   58 };
   59 #define DST_NONE        0       /* not on dst */
   60 #define DST_USA         1       /* USA style dst */
   61 #define DST_AUST        2       /* Australian style dst */
   62 #define DST_WET         3       /* Western European dst */
   63 #define DST_MET         4       /* Middle European dst */
   64 #define DST_EET         5       /* Eastern European dst */
   65 #define DST_CAN         6       /* Canada */
   66 
   67 #ifdef _KERNEL
   68 
   69 /* Operations on timespecs */
   70 #define timespecclear(tvp)      ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
   71 #define timespecisset(tvp)      ((tvp)->tv_sec || (tvp)->tv_nsec)
   72 #define timespeccmp(tvp, uvp, cmp)                                      \
   73         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
   74             ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
   75             ((tvp)->tv_sec cmp (uvp)->tv_sec))
   76 #define timespecadd(vvp, uvp)                                           \
   77         do {                                                            \
   78                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
   79                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
   80                 if ((vvp)->tv_nsec >= 1000000000) {                     \
   81                         (vvp)->tv_sec++;                                \
   82                         (vvp)->tv_nsec -= 1000000000;                   \
   83                 }                                                       \
   84         } while (0)
   85 #define timespecsub(vvp, uvp)                                           \
   86         do {                                                            \
   87                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
   88                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
   89                 if ((vvp)->tv_nsec < 0) {                               \
   90                         (vvp)->tv_sec--;                                \
   91                         (vvp)->tv_nsec += 1000000000;                   \
   92                 }                                                       \
   93         } while (0)
   94 
   95 /* Operations on timevals. */
   96 
   97 #define timevalclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0)
   98 #define timevalisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
   99 #define timevalcmp(tvp, uvp, cmp)                                       \
  100         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  101             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  102             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  103 
  104 /* timevaladd and timevalsub are not inlined */
  105 
  106 #endif /* _KERNEL */
  107 
  108 #ifndef _KERNEL                 /* NetBSD/OpenBSD compatible interfaces */
  109 
  110 #define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  111 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
  112 #define timercmp(tvp, uvp, cmp)                                 \
  113         (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
  114             ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
  115             ((tvp)->tv_sec cmp (uvp)->tv_sec))
  116 #define timeradd(tvp, uvp, vvp)                                         \
  117         do {                                                            \
  118                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
  119                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
  120                 if ((vvp)->tv_usec >= 1000000) {                        \
  121                         (vvp)->tv_sec++;                                \
  122                         (vvp)->tv_usec -= 1000000;                      \
  123                 }                                                       \
  124         } while (0)
  125 #define timersub(tvp, uvp, vvp)                                         \
  126         do {                                                            \
  127                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
  128                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
  129                 if ((vvp)->tv_usec < 0) {                               \
  130                         (vvp)->tv_sec--;                                \
  131                         (vvp)->tv_usec += 1000000;                      \
  132                 }                                                       \
  133         } while (0)
  134 #endif
  135 
  136 /*
  137  * Names of the interval timers, and structure
  138  * defining a timer setting.
  139  */
  140 #define ITIMER_REAL     0
  141 #define ITIMER_VIRTUAL  1
  142 #define ITIMER_PROF     2
  143 
  144 struct  itimerval {
  145         struct  timeval it_interval;    /* timer interval */
  146         struct  timeval it_value;       /* current value */
  147 };
  148 
  149 /*
  150  * Getkerninfo clock information structure
  151  */
  152 struct clockinfo {
  153         int     hz;             /* clock frequency */
  154         int     tick;           /* micro-seconds per hz tick */
  155         int     tickadj;        /* clock skew rate for adjtime() */
  156         int     stathz;         /* statistics clock frequency */
  157         int     profhz;         /* profiling clock frequency */
  158 };
  159 
  160 /* CLOCK_REALTIME and TIMER_ABSTIME are supposed to be in time.h */
  161 
  162 #ifndef CLOCK_REALTIME
  163 #define CLOCK_REALTIME          0
  164 #endif
  165 #define CLOCK_VIRTUAL           1
  166 #define CLOCK_PROF              2
  167 #define CLOCK_MONOTONIC         4
  168 
  169 #define CLOCK_UPTIME            5       /* from freebsd */
  170 #define CLOCK_UPTIME_PRECISE    7       /* from freebsd */
  171 #define CLOCK_UPTIME_FAST       8       /* from freebsd */
  172 #define CLOCK_REALTIME_PRECISE  9       /* from freebsd */
  173 #define CLOCK_REALTIME_FAST     10      /* from freebsd */
  174 #define CLOCK_MONOTONIC_PRECISE 11      /* from freebsd */
  175 #define CLOCK_MONOTONIC_FAST    12      /* from freebsd */
  176 #define CLOCK_SECOND            13      /* from freebsd */
  177 #define CLOCK_THREAD_CPUTIME_ID         14
  178 #define CLOCK_PROCESS_CPUTIME_ID        15
  179 
  180 #define TIMER_RELTIME   0x0     /* relative timer */
  181 #ifndef TIMER_ABSTIME
  182 #define TIMER_ABSTIME   0x1     /* absolute timer */
  183 #endif
  184 
  185 #ifdef _KERNEL
  186 
  187 extern time_t   time_second;            /* simple time_t (can step) */
  188 extern time_t   time_uptime;            /* monotonic simple uptime / seconds */
  189 extern int64_t  ntp_tick_permanent;
  190 extern int64_t  ntp_tick_acc;
  191 extern int64_t  ntp_delta;
  192 extern int64_t  ntp_big_delta;
  193 extern int32_t  ntp_tick_delta;
  194 extern int32_t  ntp_default_tick_delta;
  195 extern time_t   ntp_leap_second;
  196 extern int      ntp_leap_insert;
  197 
  198 void    initclocks_pcpu(void);
  199 void    getmicrouptime (struct timeval *tv);
  200 void    getmicrotime (struct timeval *tv);
  201 void    getnanouptime (struct timespec *tv);
  202 void    getnanotime (struct timespec *tv);
  203 int     itimerdecr (struct itimerval *itp, int usec);
  204 int     itimerfix (struct timeval *tv);
  205 int     ppsratecheck (struct timeval *, int *, int usec);
  206 int     ratecheck (struct timeval *, const struct timeval *);
  207 void    microuptime (struct timeval *tv);
  208 void    microtime (struct timeval *tv);
  209 void    nanouptime (struct timespec *ts);
  210 void    nanotime (struct timespec *ts);
  211 time_t  get_approximate_time_t(void);
  212 void    set_timeofday(struct timespec *ts);
  213 void    kern_adjtime(int64_t, int64_t *);
  214 void    kern_reladjtime(int64_t);
  215 void    timevaladd (struct timeval *, const struct timeval *);
  216 void    timevalsub (struct timeval *, const struct timeval *);
  217 int     tvtohz_high (struct timeval *);
  218 int     tvtohz_low (struct timeval *);
  219 int     tstohz_high (struct timespec *);
  220 int     tstohz_low (struct timespec *);
  221 int64_t tsc_get_target(int ns);
  222 int     tsc_test_target(int64_t target);
  223 void    tsc_delay(int ns);
  224 int     nanosleep1(struct timespec *rqt, struct timespec *rmt);
  225 
  226 #else /* !_KERNEL */
  227 
  228 #include <time.h>
  229 #include <sys/cdefs.h>
  230 
  231 #endif /* !_KERNEL */
  232 
  233 __BEGIN_DECLS
  234 
  235 #if __BSD_VISIBLE
  236 int     adjtime(const struct timeval *, struct timeval *);
  237 int     futimes(int, const struct timeval *);
  238 int     lutimes(const char *, const struct timeval *);
  239 int     settimeofday(const struct timeval *, const struct timezone *);
  240 #endif
  241 
  242 #if __XSI_VISIBLE
  243 int     getitimer(int, struct itimerval *);
  244 int     gettimeofday(struct timeval *, struct timezone *);
  245 int     setitimer(int, const struct itimerval *, struct itimerval *);
  246 int     utimes(const char *, const struct timeval *);
  247 #endif
  248 
  249 __END_DECLS
  250 
  251 #endif /* !_SYS_TIME_H_ */

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