| /* Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek <jakub@redhat.com>, 1999. |
| |
| 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 <unistd.h> |
| #include <sys/mman.h> |
| #include <string.h> |
| |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| |
| #include <kernel-features.h> |
| |
| /* This is always 12, even on architectures where PAGE_SHIFT != 12. */ |
| #if MMAP2_PAGE_SHIFT == -1 |
| static int page_shift; |
| #else |
| # ifndef MMAP2_PAGE_SHIFT |
| # define MMAP2_PAGE_SHIFT 12 |
| # endif |
| #define page_shift MMAP2_PAGE_SHIFT |
| #endif |
| |
| |
| void * |
| __mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset) |
| { |
| #if MMAP2_PAGE_SHIFT == -1 |
| if (page_shift == 0) |
| { |
| int page_size = __getpagesize (); |
| page_shift = __ffs (page_size) - 1; |
| } |
| #endif |
| if (offset & ((1 << page_shift) - 1)) |
| { |
| __set_errno (EINVAL); |
| return MAP_FAILED; |
| } |
| void *result; |
| result = (void *) |
| INLINE_SYSCALL (mmap2, 6, addr, |
| len, prot, flags, fd, |
| (off_t) (offset >> page_shift)); |
| return result; |
| } |
| weak_alias (__mmap64, mmap64) |
