xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1997-2016 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 | <http://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 | __ptr_t |
| 32 | __mmap64 (__ptr_t 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) |