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/* Some auxiliary stuff for using mmap & friends.
Copyright (C) 2002-2003 Bruno Haible <bruno@clisp.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#if defined _WIN32 && !defined __CYGWIN__
# define HAVE_WIN32_VM
#else
# include "config.h"
#endif
#ifdef HAVE_WIN32_VM
/* ------------------------ Windows ------------------------ */
#define WIN32_LEAN_AND_MEAN /* avoid including junk */
#include <windows.h>
#include <winerror.h>
#define PROT_NONE PAGE_NOACCESS
#define PROT_READ PAGE_READONLY
#define PROT_READ_WRITE PAGE_READWRITE
static void *
mmap_zeromap (void *map_addr_hint, unsigned long map_len)
{
if (VirtualAlloc ((void *)((unsigned long) map_addr_hint & -0x10000),
(((unsigned long) map_addr_hint + map_len - 1) | 0xffff) + 1
- ((unsigned long) map_addr_hint & -0x10000),
MEM_RESERVE, PAGE_NOACCESS)
&& VirtualAlloc (map_addr_hint, map_len, MEM_COMMIT, PAGE_READWRITE))
return map_addr_hint;
else
return (void *)(-1);
}
int munmap (void *addr, unsigned long len)
{
if (VirtualFree (addr, len, MEM_DECOMMIT))
return 0;
else
return -1;
}
int mprotect (void *addr, unsigned long len, int prot)
{
DWORD oldprot;
if (VirtualProtect (addr, len, prot, &oldprot))
return 0;
else
return -1;
}
#else
/* ------------------------ Unix ------------------------ */
#include <sys/types.h>
#include <sys/mman.h>
#ifndef PROT_NONE
# define PROT_NONE 0
#endif
#define PROT_READ_WRITE (PROT_READ|PROT_WRITE)
#if HAVE_MMAP_ANON
# define zero_fd -1
# define map_flags MAP_ANON | MAP_PRIVATE
#elif HAVE_MMAP_ANONYMOUS
# define zero_fd -1
# define map_flags MAP_ANONYMOUS | MAP_PRIVATE
#elif HAVE_MMAP_DEVZERO
# include <fcntl.h>
# ifndef MAP_FILE
# define MAP_FILE 0
# endif
static int zero_fd;
# define map_flags MAP_FILE | MAP_PRIVATE
#endif
static void *
mmap_zeromap (void *map_addr_hint, unsigned long map_len)
{
#ifdef __hpux
/* HP-UX 10 mmap() often fails when given a hint. So give the OS complete
freedom about the address range. */
return (void *) mmap ((void *) 0, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
#else
return (void *) mmap (map_addr_hint, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
#endif
}
#endif
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