98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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/* Some auxiliary stuff for using mmap & friends.
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Copyright (C) 2002-2021 Bruno Haible <bruno@clisp.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#if defined _WIN32 && !defined __CYGWIN__
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/* ------------------------ Windows ------------------------ */
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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# include <winerror.h>
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# define PROT_NONE PAGE_NOACCESS
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# define PROT_READ PAGE_READONLY
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# define PROT_READ_WRITE PAGE_READWRITE
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static void *
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mmap_zeromap (void *map_addr_hint, size_t map_len)
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{
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if (VirtualAlloc ((void *)((uintptr_t) map_addr_hint & -0x10000),
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(((uintptr_t) map_addr_hint + map_len - 1) | 0xffff) + 1
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- ((uintptr_t) map_addr_hint & -0x10000),
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MEM_RESERVE, PAGE_NOACCESS)
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&& VirtualAlloc (map_addr_hint, map_len, MEM_COMMIT, PAGE_READWRITE))
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return map_addr_hint;
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else
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return (void *)(-1);
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}
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int
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munmap (void *addr, size_t len)
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{
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if (VirtualFree (addr, len, MEM_DECOMMIT))
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return 0;
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else
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return -1;
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}
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int
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mprotect (void *addr, size_t len, int prot)
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{
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DWORD oldprot;
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if (VirtualProtect (addr, len, prot, &oldprot))
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return 0;
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else
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return -1;
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}
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#else
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/* ------------------------ Unix ------------------------ */
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# include <sys/types.h>
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# include <sys/mman.h>
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# include <fcntl.h>
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# ifndef PROT_NONE
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# define PROT_NONE 0
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# endif
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# define PROT_READ_WRITE (PROT_READ|PROT_WRITE)
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# if HAVE_MAP_ANONYMOUS
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# define zero_fd -1
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# define map_flags MAP_ANONYMOUS | MAP_PRIVATE
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# else
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# ifndef MAP_FILE
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# define MAP_FILE 0
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# endif
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static int zero_fd;
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# define map_flags MAP_FILE | MAP_PRIVATE
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# endif
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static void *
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mmap_zeromap (void *map_addr_hint, size_t map_len)
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{
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# ifdef __hpux
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/* HP-UX 10 mmap() often fails when given a hint. So give the OS complete
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freedom about the address range. */
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return (void *) mmap ((void *) 0, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
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# else
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return (void *) mmap (map_addr_hint, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
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# endif
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}
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#endif
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