projects / thirdparty / glibc.git / blame
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| b9b49b44 UD |
1 | /* Copyright (C) 1997 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 | |
| 41bdb6e2 AJ |
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. | |
| b9b49b44 UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| b9b49b44 | 13 | |
| 41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free | |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 17 | 02111-1307 USA. */ | |
| b9b49b44 UD |
18 | |
| 19 | #include <errno.h> | |
| 20 | #include <sys/mman.h> | |
| 21 | #include <sys/types.h> | |
| 22 | ||
| 23 | /* Map addresses starting near ADDR and extending for LEN bytes. From | |
| 24 | OFFSET into the file FD describes according to PROT and FLAGS. If ADDR | |
| 25 | is nonzero, it is the desired mapping address. If the MAP_FIXED bit is | |
| 26 | set in FLAGS, the mapping will be at ADDR exactly (which must be | |
| 27 | page-aligned); otherwise the system chooses a convenient nearby address. | |
| 28 | The return value is the actual mapping address chosen or MAP_FAILED | |
| 29 | for errors (in which case `errno' is set). A successful `mmap' call | |
| 30 | deallocates any previous mapping for the affected region. */ | |
| 31 | ||
| 32 | __ptr_t | |
| 33 | __mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, | |
| 34 | __off64_t offset) | |
| 35 | { | |
| 36 | off_t small_offset = (off_t) offset; | |
| 37 | ||
| 38 | if (small_offset != offset) | |
| 39 | { | |
| 40 | /* We cannot do this since the offset is too large. */ | |
| 41 | __set_errno (EOVERFLOW); | |
| 42 | return MAP_FAILED; | |
| 43 | } | |
| 44 | ||
| 45 | return __mmap (addr, len, prot, flags, fd, small_offset); | |
| 46 | } | |
| 47 | ||
| 48 | weak_alias (__mmap64, mmap64) |