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/clock.h

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    1 /*-
    2  * Copyright (c) 1996 The NetBSD Foundation, Inc.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to The NetBSD Foundation
    6  * by Gordon W. Ross
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *        This product includes software developed by the NetBSD
   19  *        Foundation, Inc. and its contributors.
   20  * 4. Neither the name of The NetBSD Foundation nor the names of its
   21  *    contributors may be used to endorse or promote products derived
   22  *    from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   27  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   28  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   34  * POSSIBILITY OF SUCH DAMAGE.
   35  *
   36  *      $NetBSD: clock_subr.h,v 1.7 2000/10/03 13:41:07 tsutsui Exp $
   37  *
   38  *
   39  * This file is the central clearing-house for calendrical issues.
   40  *
   41  * In general the kernel does not know about minutes, hours, days, timezones,
   42  * daylight savings time, leap-years and such.  All that is theoretically a
   43  * matter for userland only.
   44  *
   45  * Parts of kernel code does however care: badly designed filesystems store
   46  * timestamps in local time and RTC chips sometimes track time in a local
   47  * timezone instead of UTC and so on.
   48  *
   49  * All that code should go here for service.
   50  *
   51  * $FreeBSD: releng/8.1/sys/sys/clock.h 199583 2009-11-20 15:27:52Z jhb $
   52  */
   53 
   54 #ifndef _SYS_CLOCK_H_
   55 #define _SYS_CLOCK_H_
   56 
   57 #ifdef _KERNEL          /* No user serviceable parts */
   58 
   59 /*
   60  * Timezone info from settimeofday(2), usually not used
   61  */
   62 extern int tz_minuteswest;
   63 extern int tz_dsttime;
   64 
   65 int utc_offset(void);
   66 
   67 /*
   68  * Structure to hold the values typically reported by time-of-day clocks.
   69  * This can be passed to the generic conversion functions to be converted
   70  * to a struct timespec.
   71  */
   72 struct clocktime {
   73         int     year;                   /* year (4 digit year) */
   74         int     mon;                    /* month (1 - 12) */
   75         int     day;                    /* day (1 - 31) */
   76         int     hour;                   /* hour (0 - 23) */
   77         int     min;                    /* minute (0 - 59) */
   78         int     sec;                    /* second (0 - 59) */
   79         int     dow;                    /* day of week (0 - 6; 0 = Sunday) */
   80         long    nsec;                   /* nano seconds */
   81 };
   82 
   83 int clock_ct_to_ts(struct clocktime *, struct timespec *);
   84 void clock_ts_to_ct(struct timespec *, struct clocktime *);
   85 void clock_register(device_t, long);
   86 
   87 /*
   88  * BCD to decimal and decimal to BCD.
   89  */
   90 #define FROMBCD(x)      bcd2bin(x)
   91 #define TOBCD(x)        bin2bcd(x)
   92 
   93 /* Some handy constants. */
   94 #define SECDAY          (24 * 60 * 60)
   95 #define SECYR           (SECDAY * 365)
   96 
   97 /* Traditional POSIX base year */
   98 #define POSIX_BASE_YEAR 1970
   99 
  100 void timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp);
  101 void fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp);
  102 
  103 #endif /* _KERNEL */
  104 
  105 #endif /* !_SYS_CLOCK_H_ */

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