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clock.h revision 1.1 
      1 /*	$NetBSD: clock.h,v 1.1 1996/07/20 17:35:42 ragge Exp $ */
      2 /*
      3  * Copyright (c) 1996 Ludd, University of Lule}, Sweden.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed at Ludd, University of
     17  *	Lule}, Sweden and its contributors.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 
     34 /*
     35  * Conversion structure.
     36  */
     37 struct chiptime {
     38 	long	sec;
     39 	long	min;
     40 	long	hour;
     41 	long	day;
     42 	long	mon;
     43 	long	year;
     44 };
     45 
     46 /*
     47  * Time constants. These are unlikely to change.
     48  */
     49 #define IS_LEAPYEAR(y) (((y % 4) == 0) && (y % 100))
     50 
     51 #define SEC_PER_MIN	(60)
     52 #define SEC_PER_HOUR	(SEC_PER_MIN * 60)
     53 #define SEC_PER_DAY	(SEC_PER_HOUR * 24)
     54 #define DAYSPERYEAR(y)	(IS_LEAPYEAR(y) ? 366 : 365)
     55 #define SECPERYEAR(y)	(DAYSPERYEAR(y) * SEC_PER_DAY)
     56 
     57 #define CLKREAD_OK	0
     58 #define CLKREAD_BAD	-1
     59 #define CLKREAD_WARN	-2
     60 
     61 #define TODRBASE	(1 << 28) /* Rumours says it comes from VMS */
     62 
     63 /* Prototypes */
     64 long	chiptotime __P((struct chiptime *));
     65 void	timetochip __P((struct chiptime *));
     66 void	generic_clock __P((void));
     67 void	no_nicr_clock __P((void));
     68 int	generic_clkread __P((time_t));
     69 void	generic_clkwrite __P((void));
     70