FreeBSD/Linux Kernel Cross Reference
sys/sys/clock.h

     /*-
      * Copyright (c) 1996 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Gordon W. Ross
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     *
     *      $NetBSD: clock_subr.h,v 1.7 2000/10/03 13:41:07 tsutsui Exp $
     *
     *
     * This file is the central clearing-house for calendrical issues.
     *
     * In general the kernel does not know about minutes, hours, days, timezones,
     * daylight savings time, leap-years and such.  All that is theoretically a
     * matter for userland only.
     *
     * Parts of kernel code does however care: badly designed filesystems store
     * timestamps in local time and RTC chips sometimes track time in a local
     * timezone instead of UTC and so on.
     *
     * All that code should go here for service.
     *
     * $FreeBSD: releng/8.0/sys/sys/clock.h 178429 2008-04-22 19:38:30Z phk $
     */
    
    #ifndef _SYS_CLOCK_H_
    #define _SYS_CLOCK_H_
    
    #ifdef _KERNEL          /* No user serviceable parts */
    
    /*
     * Timezone info from settimeofday(2), usually not used
     */
    extern int tz_minuteswest;
    extern int tz_dsttime;
    
    int utc_offset(void);
    
    /*
     * Structure to hold the values typically reported by time-of-day clocks.
     * This can be passed to the generic conversion functions to be converted
     * to a struct timespec.
     */
    struct clocktime {
            int     year;                   /* year (4 digit year) */
            int     mon;                    /* month (1 - 12) */
            int     day;                    /* day (1 - 31) */
            int     hour;                   /* hour (0 - 23) */
            int     min;                    /* minute (0 - 59) */
            int     sec;                    /* second (0 - 59) */
            int     dow;                    /* day of week (0 - 6; 0 = Sunday) */
            long    nsec;                   /* nano seconds */
    };
    
    int clock_ct_to_ts(struct clocktime *, struct timespec *);
    void clock_ts_to_ct(struct timespec *, struct clocktime *);
    void clock_register(device_t, long);
    
    /*
     * BCD to decimal and decimal to BCD.
     */
    #define FROMBCD(x)      bcd2bin(x)
    #define TOBCD(x)        bin2bcd(x)
    
    /* Some handy constants. */
    #define SECDAY          (24 * 60 * 60)
    #define SECYR           (SECDAY * 365)
    
    /* Traditional POSIX base year */
    #define POSIX_BASE_YEAR 1970
    
   void timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp);
   void fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp);
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_CLOCK_H_ */

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