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glibc/misc/mmap64.c
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <sys/mman.h> | |
#include <sys/types.h> | |
/* Map addresses starting near ADDR and extending for LEN bytes. From | |
OFFSET into the file FD describes according to PROT and FLAGS. If ADDR | |
is nonzero, it is the desired mapping address. If the MAP_FIXED bit is | |
set in FLAGS, the mapping will be at ADDR exactly (which must be | |
page-aligned); otherwise the system chooses a convenient nearby address. | |
The return value is the actual mapping address chosen or MAP_FAILED | |
for errors (in which case `errno' is set). A successful `mmap' call | |
deallocates any previous mapping for the affected region. */ | |
__ptr_t | |
__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, | |
__off64_t offset) | |
{ | |
off_t small_offset = (off_t) offset; | |
if (small_offset != offset) | |
{ | |
/* We cannot do this since the offset is too large. */ | |
__set_errno (EOVERFLOW); | |
return MAP_FAILED; | |
} | |
return __mmap (addr, len, prot, flags, fd, small_offset); | |
} | |
weak_alias (__mmap64, mmap64) |