sysdeps/unix/sysv/linux/generic/wordsize-32/mmap.c

   1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <sys/mman.h>
  21 #include <errno.h>
  22 #include <sysdep.h>
  23
  24 #ifndef MMAP_PAGE_SHIFT
  25 #define MMAP_PAGE_SHIFT 12
  26 #endif
  27
  28 __ptr_t
  29 __mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
  30 {
  31   if (offset & ((1 << MMAP_PAGE_SHIFT) - 1))
  32     {
  33       __set_errno (EINVAL);
  34       return MAP_FAILED;
  35     }
  36   return (__ptr_t) INLINE_SYSCALL (mmap2, 6, addr, len, prot, flags, fd,
  37                                    offset >> MMAP_PAGE_SHIFT);
  38 }
  39
  40 weak_alias (__mmap, mmap)