mmalloc/mvalloc.c

   1 /* Allocate memory on a page boundary.
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #include "mmprivate.h"
  20
  21 /* Cache the pagesize for the current host machine.  Note that if the host
  22    does not readily provide a getpagesize() function, we need to emulate it
  23    elsewhere, not clutter up this file with lots of kluges to try to figure
  24    it out. */
  25
  26 static size_t cache_pagesize;
  27 #if NEED_DECLARATION_GETPAGESIZE
  28 extern int getpagesize PARAMS ((void));
  29 #endif
  30
  31 PTR
  32 mvalloc (md, size)
  33   PTR md;
  34   size_t size;
  35 {
  36   if (cache_pagesize == 0)
  37     {
  38       cache_pagesize = getpagesize ();
  39     }
  40
  41   return (mmemalign (md, cache_pagesize, size));
  42 }
  43
  44
  45 PTR
  46 valloc (size)
  47   size_t size;
  48 {
  49   return mvalloc ((PTR) NULL, size);
  50 }