diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/mmap64.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/mmap64.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/mmap64.c b/REORG.TODO/sysdeps/unix/sysv/linux/mmap64.c new file mode 100644 index 0000000000..d3ea279afe --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/mmap64.c @@ -0,0 +1,60 @@ +/* mmap - map files or devices into memory. Linux version. + Copyright (C) 1999-2017 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) + +#ifdef __OFF_T_MATCHES_OFF64_T +weak_alias (__mmap64, mmap) +weak_alias (__mmap64, __mmap) +#endif |