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Annotation of GNUtools/libg++/libiberty/getpagesize.c, revision 1.1

1.1     ! root        1: /* Emulation of getpagesize() for systems that need it.
        !             2:    Copyright (C) 1991 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of the libiberty library.
        !             5: Libiberty is free software; you can redistribute it and/or
        !             6: modify it under the terms of the GNU Library General Public
        !             7: License as published by the Free Software Foundation; either
        !             8: version 2 of the License, or (at your option) any later version.
        !             9: 
        !            10: Libiberty is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            13: Library General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU Library General Public
        !            16: License along with libiberty; see the file COPYING.LIB.  If
        !            17: not, write to the Free Software Foundation, Inc., 675 Mass Ave,
        !            18: Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: /*
        !            21: 
        !            22: NAME
        !            23: 
        !            24:        getpagesize -- return the number of bytes in page of memory
        !            25: 
        !            26: SYNOPSIS
        !            27: 
        !            28:        int getpagesize (void)
        !            29: 
        !            30: DESCRIPTION
        !            31: 
        !            32:        Returns the number of bytes in a page of memory.  This is the
        !            33:        granularity of many of the system memory management routines.
        !            34:        No guarantee is made as to whether or not it is the same as the
        !            35:        basic memory management hardware page size.
        !            36: 
        !            37: BUGS
        !            38: 
        !            39:        Is intended as a reasonable replacement for systems where this
        !            40:        is not provided as a system call.  The value of 4096 may or may
        !            41:        not be correct for the systems where it is returned as the default
        !            42:        value.
        !            43: 
        !            44: */
        !            45: 
        !            46: 
        !            47: #include <sys/types.h>
        !            48: #include <sys/param.h>
        !            49: 
        !            50: #ifdef HAVE_SYSCONF
        !            51: #include <unistd.h>
        !            52: #define GNU_OUR_PAGESIZE sysconf(_SC_PAGESIZE)
        !            53: #else
        !            54: #ifdef PAGESIZE
        !            55: #define        GNU_OUR_PAGESIZE PAGESIZE
        !            56: #else  /* no PAGESIZE */
        !            57: #ifdef EXEC_PAGESIZE
        !            58: #define        GNU_OUR_PAGESIZE EXEC_PAGESIZE
        !            59: #else  /* no EXEC_PAGESIZE */
        !            60: #ifdef NBPG
        !            61: #define        GNU_OUR_PAGESIZE (NBPG * CLSIZE)
        !            62: #ifndef        CLSIZE
        !            63: #define        CLSIZE 1
        !            64: #endif /* CLSIZE */
        !            65: #else  /* no NBPG */
        !            66: #ifdef NBPC
        !            67: #define        GNU_OUR_PAGESIZE NBPC
        !            68: #else  /* no NBPC */
        !            69: #define        GNU_OUR_PAGESIZE 4096   /* Just punt and use reasonable value */
        !            70: #endif /* NBPC */
        !            71: #endif /* NBPG */
        !            72: #endif /* EXEC_PAGESIZE */
        !            73: #endif /* PAGESIZE */
        !            74: #endif /* HAVE_SYSCONF */
        !            75: 
        !            76: int
        !            77: getpagesize ()
        !            78: {
        !            79:   return (GNU_OUR_PAGESIZE);
        !            80: }
        !            81: 

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