Added simplest device mount implementation (includes NullDevice and RandomDevice)

libraries/nacl-mounts/memory/MemMount.cc

 /*
  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "MemMount.h"
 
 MemMount::MemMount() {
   // Don't use the zero slot
   slots_.Alloc();
@@ skipping 283 matching lines @@
   }
 
   for (; it != children->end() &&
          bytes_read + sizeof(struct dirent) <= count;
        ++it) {
     memset(dir, 0, sizeof(struct dirent));
     // We want d_ino to be non-zero because readdir()
     // will return null if d_ino is zero.
     dir->d_ino = 0x60061E;
     dir->d_reclen = sizeof(struct dirent);
-    dir->d_reclen = sizeof(struct dirent);
     strncpy(dir->d_name, slots_.At(*it)->name().c_str(), sizeof(dir->d_name));
     ++dir;
     ++pos;
     bytes_read += sizeof(struct dirent);
   }
   return bytes_read;
 }
 
 ssize_t MemMount::Read(ino_t slot, off_t offset, void *buf, size_t count) {
   MemNode *node = slots_.At(slot);
@@ skipping 36 matching lines @@
   }
 
   // Write out the block.
   memcpy(node->data() + offset, buf, count);
   offset += count;
   if (offset > static_cast<off_t>(node->len())) {
     node->set_len(offset);
   }
   return count;
 }