1 /* Some auxiliary stuff for using mmap & friends.
2 Copyright (C) 2002-2021 Bruno Haible <bruno@clisp.org>
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 #if defined _WIN32 && !defined __CYGWIN__
19 /* ------------------------ Windows ------------------------ */
21 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
23 # include <winerror.h>
24 # define PROT_NONE PAGE_NOACCESS
25 # define PROT_READ PAGE_READONLY
26 # define PROT_READ_WRITE PAGE_READWRITE
29 mmap_zeromap (void *map_addr_hint, size_t map_len)
31 if (VirtualAlloc ((void *)((uintptr_t) map_addr_hint & -0x10000),
32 (((uintptr_t) map_addr_hint + map_len - 1) | 0xffff) + 1
33 - ((uintptr_t) map_addr_hint & -0x10000),
34 MEM_RESERVE, PAGE_NOACCESS)
35 && VirtualAlloc (map_addr_hint, map_len, MEM_COMMIT, PAGE_READWRITE))
42 munmap (void *addr, size_t len)
44 if (VirtualFree (addr, len, MEM_DECOMMIT))
51 mprotect (void *addr, size_t len, int prot)
55 if (VirtualProtect (addr, len, prot, &oldprot))
63 /* ------------------------ Unix ------------------------ */
65 # include <sys/types.h>
66 # include <sys/mman.h>
72 # define PROT_READ_WRITE (PROT_READ|PROT_WRITE)
74 # if HAVE_MAP_ANONYMOUS
76 # define map_flags MAP_ANONYMOUS | MAP_PRIVATE
82 # define map_flags MAP_FILE | MAP_PRIVATE
86 mmap_zeromap (void *map_addr_hint, size_t map_len)
89 /* HP-UX 10 mmap() often fails when given a hint. So give the OS complete
90 freedom about the address range. */
91 return (void *) mmap ((void *) 0, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
93 return (void *) mmap (map_addr_hint, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);