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/* Some auxiliary stuff for using mmap & friends.
Copyright (C) 2002-2021 Free Software Foundation, Inc.
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 of the License, 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, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible. */
#if defined _WIN32 && !defined __CYGWIN__
/* ------------------------ 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, size_t map_len)
{
if (VirtualAlloc ((void *)((uintptr_t) map_addr_hint & -0x10000),
(((uintptr_t) map_addr_hint + map_len - 1) | 0xffff) + 1
- ((uintptr_t) 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, size_t len)
{
if (VirtualFree (addr, len, MEM_DECOMMIT))
return 0;
else
return -1;
}
int
mprotect (void *addr, size_t 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>
# include <fcntl.h>
# ifndef PROT_NONE
# define PROT_NONE 0
# endif
# define PROT_READ_WRITE (PROT_READ|PROT_WRITE)
# if HAVE_MAP_ANONYMOUS
# define zero_fd -1
# define map_flags MAP_ANONYMOUS | MAP_PRIVATE
# else
# 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, size_t 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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