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  *
   17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   27  * POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  *      $NetBSD: clock_subr.h,v 1.7 2000/10/03 13:41:07 tsutsui Exp $
   30  *
   31  *
   32  * This file is the central clearing-house for calendrical issues.
   33  *
   34  * In general the kernel does not know about minutes, hours, days, timezones,
   35  * daylight savings time, leap-years and such.  All that is theoretically a
   36  * matter for userland only.
   37  *
   38  * Parts of kernel code does however care: badly designed filesystems store
   39  * timestamps in local time and RTC chips sometimes track time in a local
   40  * timezone instead of UTC and so on.
   41  *
   42  * All that code should go here for service.
   43  *
   44  * $FreeBSD$
   45  */
   46 
   47 #ifndef _SYS_CLOCK_H_
   48 #define _SYS_CLOCK_H_
   49 
   50 #ifdef _KERNEL          /* No user serviceable parts */
   51 
   52 /*
   53  * Timezone info from settimeofday(2), usually not used
   54  */
   55 extern int tz_minuteswest;
   56 extern int tz_dsttime;
   57 
   58 int utc_offset(void);
   59 
   60 /*
   61  * Structure to hold the values typically reported by time-of-day clocks.
   62  * This can be passed to the generic conversion functions to be converted
   63  * to a struct timespec.
   64  */
   65 struct clocktime {
   66         int     year;                   /* year (4 digit year) */
   67         int     mon;                    /* month (1 - 12) */
   68         int     day;                    /* day (1 - 31) */
   69         int     hour;                   /* hour (0 - 23) */
   70         int     min;                    /* minute (0 - 59) */
   71         int     sec;                    /* second (0 - 59) */
   72         int     dow;                    /* day of week (0 - 6; 0 = Sunday) */
   73         long    nsec;                   /* nano seconds */
   74 };
   75 
   76 int clock_ct_to_ts(struct clocktime *, struct timespec *);
   77 void clock_ts_to_ct(struct timespec *, struct clocktime *);
   78 void clock_register(device_t, long);
   79 
   80 /*
   81  * BCD to decimal and decimal to BCD.
   82  */
   83 #define FROMBCD(x)      bcd2bin(x)
   84 #define TOBCD(x)        bin2bcd(x)
   85 
   86 /* Some handy constants. */
   87 #define SECDAY          (24 * 60 * 60)
   88 #define SECYR           (SECDAY * 365)
   89 
   90 /* Traditional POSIX base year */
   91 #define POSIX_BASE_YEAR 1970
   92 
   93 void timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp);
   94 void fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp);
   95 
   96 #endif /* _KERNEL */
   97 
   98 #endif /* !_SYS_CLOCK_H_ */

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