sysdeps/nacl/mmap.c

   1 /* Map addresses from a file or anonymous memory.  NaCl version.
   2    Copyright (C) 2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <errno.h>
  20 #include <sys/mman.h>
  21 #include <nacl-interfaces.h>
  22
  23
  24 /* Map addresses starting near ADDR and extending for LEN bytes.  From
  25    OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
  26    is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
  27    set in FLAGS, the mapping will be at ADDR exactly (which must be
  28    page-aligned); otherwise the system chooses a convenient nearby address.
  29    The return value is the actual mapping address chosen or MAP_FAILED
  30    for errors (in which case `errno' is set).  A successful `mmap' call
  31    deallocates any previous mapping for the affected region.  */
  32
  33 __ptr_t
  34 __mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
  35 {
  36   int error = __nacl_irt_memory.mmap (&addr, len, prot, flags, fd, offset);
  37   if (error)
  38     {
  39       errno = error;
  40       return MAP_FAILED;
  41     }
  42   return addr;
  43 }
  44 weak_alias (__mmap, mmap)
  45
  46
  47 /* Since off64_t is the same as off_t, mmap64 is just an alias.  */
  48 strong_alias (__mmap, __mmap64)
  49 weak_alias (__mmap, mmap64)