valloc.c

linux下bash的源码

/* Allocate memory on a page boundary.
   Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.

This 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.

This 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 this library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.

   The author may be reached (Email) at the address [e-mail],
   or (US mail) as Mike Haertel c/o Free Software Foundation.  */

#ifndef	_MALLOC_INTERNAL
#define	_MALLOC_INTERNAL
#include <malloc.h>
#endif

#if defined (emacs) || defined (HAVE_CONFIG_H)
#include "config.h"
#endif

#ifdef	__GNU_LIBRARY__
extern size_t __getpagesize __P ((void));
#else
#include "getpagesize.h"
#define	 __getpagesize()	getpagesize()
#endif

static size_t pagesize;

__ptr_t
valloc (size)
     size_t size;
{
  if (pagesize == 0)
    pagesize = __getpagesize ();

  return memalign (pagesize, size);
}