| 1 | /* Some auxiliary stuff for using mmap & friends.
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| 2 | Copyright (C) 2002-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible. */
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| 18 |
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| 19 | #if defined _WIN32 && !defined __CYGWIN__
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| 20 |
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| 21 | /* ------------------------ Windows ------------------------ */
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| 22 |
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| 23 | # define WIN32_LEAN_AND_MEAN /* avoid including junk */
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| 24 | # include <windows.h>
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| 25 | # include <winerror.h>
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| 26 | # define PROT_NONE PAGE_NOACCESS
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| 27 | # define PROT_READ PAGE_READONLY
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| 28 | # define PROT_READ_WRITE PAGE_READWRITE
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| 29 |
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| 30 | static void *
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| 31 | mmap_zeromap (void *map_addr_hint, size_t map_len)
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| 32 | {
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| 33 | if (VirtualAlloc ((void *)((uintptr_t) map_addr_hint & -0x10000),
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| 34 | (((uintptr_t) map_addr_hint + map_len - 1) | 0xffff) + 1
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| 35 | - ((uintptr_t) map_addr_hint & -0x10000),
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| 36 | MEM_RESERVE, PAGE_NOACCESS)
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| 37 | && VirtualAlloc (map_addr_hint, map_len, MEM_COMMIT, PAGE_READWRITE))
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| 38 | return map_addr_hint;
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| 39 | else
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| 40 | return (void *)(-1);
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| 41 | }
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| 42 |
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| 43 | int
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| 44 | munmap (void *addr, size_t len)
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| 45 | {
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| 46 | if (VirtualFree (addr, len, MEM_DECOMMIT))
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| 47 | return 0;
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| 48 | else
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| 49 | return -1;
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| 50 | }
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| 51 |
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| 52 | int
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| 53 | mprotect (void *addr, size_t len, int prot)
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| 54 | {
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| 55 | DWORD oldprot;
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| 56 |
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| 57 | if (VirtualProtect (addr, len, prot, &oldprot))
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| 58 | return 0;
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| 59 | else
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| 60 | return -1;
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| 61 | }
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| 62 |
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| 63 | #else
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| 64 |
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| 65 | /* ------------------------ Unix ------------------------ */
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| 66 |
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| 67 | # include <sys/types.h>
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| 68 | # include <sys/mman.h>
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| 69 | # include <fcntl.h>
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| 70 |
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| 71 | # ifndef PROT_NONE
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| 72 | # define PROT_NONE 0
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| 73 | # endif
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| 74 | # define PROT_READ_WRITE (PROT_READ|PROT_WRITE)
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| 75 |
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| 76 | # if HAVE_MAP_ANONYMOUS
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| 77 | # define zero_fd -1
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| 78 | # define map_flags MAP_ANONYMOUS | MAP_PRIVATE
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| 79 | # else
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| 80 | # ifndef MAP_FILE
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| 81 | # define MAP_FILE 0
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| 82 | # endif
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| 83 | static int zero_fd;
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| 84 | # define map_flags MAP_FILE | MAP_PRIVATE
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| 85 | # endif
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| 86 |
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| 87 | static void *
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| 88 | mmap_zeromap (void *map_addr_hint, size_t map_len)
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| 89 | {
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| 90 | # ifdef __hpux
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| 91 | /* HP-UX 10 mmap() often fails when given a hint. So give the OS complete
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| 92 | freedom about the address range. */
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| 93 | return (void *) mmap ((void *) 0, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
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| 94 | # else
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| 95 | return (void *) mmap (map_addr_hint, map_len, PROT_READ_WRITE, map_flags, zero_fd, 0);
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| 96 | # endif
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| 97 | }
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| 98 |
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| 99 | #endif
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