| /* mmap - map files or devices into memory. Linux version. |
| Copyright (C) 1999-2018 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 <sysdep.h> |
| #include <mmap_internal.h> |
| |
| /* To avoid silent truncation of offset when using mmap2, do not accept |
| offset larger than 1 << (page_shift + off_t bits). For archictures with |
| 32 bits off_t and page size of 4096 it would be 1^44. */ |
| #define MMAP_OFF_HIGH_MASK \ |
| ((-(MMAP2_PAGE_UNIT << 1) << (8 * sizeof (off_t) - 1))) |
| |
| #define MMAP_OFF_MASK (MMAP_OFF_HIGH_MASK | MMAP_OFF_LOW_MASK) |
| |
| /* An architecture may override this. */ |
| #ifndef MMAP_PREPARE |
| # define MMAP_PREPARE(addr, len, prot, flags, fd, offset) |
| #endif |
| |
| void * |
| __mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset) |
| { |
| MMAP_CHECK_PAGE_UNIT (); |
| |
| if (offset & MMAP_OFF_MASK) |
| return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); |
| |
| MMAP_PREPARE (addr, len, prot, flags, fd, offset); |
| #ifdef __NR_mmap2 |
| return (void *) MMAP_CALL (mmap2, addr, len, prot, flags, fd, |
| (off_t) (offset / MMAP2_PAGE_UNIT)); |
| #else |
| return (void *) MMAP_CALL (mmap, addr, len, prot, flags, fd, offset); |
| #endif |
| } |
| weak_alias (__mmap64, mmap64) |
| libc_hidden_def (__mmap64) |
| |
| #ifdef __OFF_T_MATCHES_OFF64_T |
| weak_alias (__mmap64, mmap) |
| weak_alias (__mmap64, __mmap) |
| libc_hidden_def (__mmap) |
| #endif |
