mvalloc.c   [plain text]

/* Allocate memory on a page boundary.
   Copyright (C) 1991 Free Software Foundation, Inc.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "mmprivate.h"

/* Cache the pagesize for the current host machine.  Note that if the host
   does not readily provide a getpagesize() function, we need to emulate it
   elsewhere, not clutter up this file with lots of kluges to try to figure
   it out. */

static size_t cache_pagesize;
#if NEED_DECLARATION_GETPAGESIZE
extern int getpagesize PARAMS ((void));
#endif

PTR
mvalloc (md, size)
  PTR md;
  size_t size;
{
  if (cache_pagesize == 0)
    {
      cache_pagesize = getpagesize ();
    }

  return (mmemalign (md, cache_pagesize, size));
}


#if REPLACE_SYSMALLOC
/* When using this package, provide a version of malloc/realloc/free built
   on top of it, so that if we use the default sbrk() region we will not
   collide with another malloc package trying to do the same thing, if
   the application contains any "hidden" calls to malloc/realloc/free (such
   as inside a system library). */

PTR
valloc (size)
  size_t size;
{
  return mvalloc ((PTR) NULL, size);
}
#endif