1 | /* Copyright (C) 1997-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library 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 GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <sys/mman.h> |
20 | #include <sys/types.h> |
21 | |
22 | /* Map addresses starting near ADDR and extending for LEN bytes. From |
23 | OFFSET into the file FD describes according to PROT and FLAGS. If ADDR |
24 | is nonzero, it is the desired mapping address. If the MAP_FIXED bit is |
25 | set in FLAGS, the mapping will be at ADDR exactly (which must be |
26 | page-aligned); otherwise the system chooses a convenient nearby address. |
27 | The return value is the actual mapping address chosen or MAP_FAILED |
28 | for errors (in which case `errno' is set). A successful `mmap' call |
29 | deallocates any previous mapping for the affected region. */ |
30 | |
31 | void * |
32 | __mmap64 (void *addr, size_t len, int prot, int flags, int fd, |
33 | __off64_t offset) |
34 | { |
35 | off_t small_offset = (off_t) offset; |
36 | |
37 | if (small_offset != offset) |
38 | { |
39 | /* We cannot do this since the offset is too large. */ |
40 | __set_errno (EOVERFLOW); |
41 | return MAP_FAILED; |
42 | } |
43 | |
44 | return __mmap (addr, len, prot, flags, fd, small_offset); |
45 | } |
46 | |
47 | weak_alias (__mmap64, mmap64) |
48 | libc_hidden_def (__mmap64) |
49 | |