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/i386/include/ansi.h

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    1 /*-
    2  * Copyright (c) 1990, 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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)ansi.h      8.2 (Berkeley) 1/4/94
   34  * $FreeBSD: src/sys/i386/include/ansi.h,v 1.10.2.1 1999/09/05 08:11:35 peter Exp $
   35  */
   36 
   37 #ifndef _MACHINE_ANSI_H_
   38 #define _MACHINE_ANSI_H_
   39 
   40 /*
   41  * Types which are fundamental to the implementation and must be declared
   42  * in more than one standard header are defined here.  Standard headers
   43  * then use:
   44  *      #ifdef  _BSD_SIZE_T_
   45  *      typedef _BSD_SIZE_T_ size_t;
   46  *      #undef  _BSD_SIZE_T_
   47  *      #endif
   48  */
   49 #define _BSD_CLOCK_T_   unsigned long           /* clock() */
   50 #define _BSD_PTRDIFF_T_ int                     /* ptr1 - ptr2 */
   51 #define _BSD_RUNE_T_    _BSD_CT_RUNE_T_         /* rune_t (see below) */
   52 #define _BSD_SIZE_T_    unsigned int            /* sizeof() */
   53 #define _BSD_SSIZE_T_   int                     /* byte count or error */
   54 #define _BSD_TIME_T_    long                    /* time() */
   55 #define _BSD_WCHAR_T_   _BSD_CT_RUNE_T_         /* wchar_t (see below) */
   56 
   57 /*
   58  * Types which are fundamental to the implementation and must be used
   59  * in more than one standard header although they are only declared in
   60  * one (perhaps nonstandard) header are defined here.  Standard headers
   61  * use _BSD_XXX_T_ without undef'ing it.
   62  */
   63 #define _BSD_CT_RUNE_T_ int                     /* arg type for ctype funcs */
   64 #define _BSD_OFF_T_     long long               /* file offset */
   65 #define _BSD_PID_T_     int                     /* process [group] */
   66 #define _BSD_VA_LIST_   char *                  /* va_list */
   67 
   68 /*
   69  * The rune type is declared to be an ``int'' instead of the more natural
   70  * ``unsigned long'' or ``long''.  Two things are happening here.  It is not
   71  * unsigned so that EOF (-1) can be naturally assigned to it and used.  Also,
   72  * it looks like 10646 will be a 31 bit standard.  This means that if your
   73  * ints cannot hold 32 bits, you will be in trouble.  The reason an int was
   74  * chosen over a long is that the is*() and to*() routines take ints (says
   75  * ANSI C), but they use _BSD_CT_RUNE_T_ instead of int.  By changing it
   76  * here, you lose a bit of ANSI conformance, but your programs will still
   77  * work.
   78  */
   79 
   80 /*
   81  * Frequencies of the clock ticks reported by clock() and times().  They
   82  * are the same as stathz for bogus historical reasons.  They should be
   83  * 1e6 because clock() and times() are implemented using getrusage() and
   84  * there is no good reason why they should be less accurate.  There is
   85  * the bad reason that (broken) programs might not like clock_t or
   86  * CLOCKS_PER_SEC being ``double'' (``unsigned long'' is not large enough
   87  * to hold the required 24 hours worth of ticks if the frequency is
   88  * 1000000ul, and ``unsigned long long'' would be nonstandard).
   89  */
   90 #define _BSD_CLK_TCK_           128
   91 #define _BSD_CLOCKS_PER_SEC_    128
   92 
   93 #endif /* !_MACHINE_ANSI_H_ */

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