/* 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