[NaCl SDK] nacl_io: Add chmod/fchmod

native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc

 // Copyright (c) 2012 The Chromium 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 "nacl_io/kernel_proxy.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
@@ skipping 781 matching lines @@
 
   error = fs->Remove(rel);
   if (error) {
     errno = error;
     return -1;
   }
 
   return 0;
 }
 
-// TODO(noelallen): Needs implementation.
-int KernelProxy::fchmod(int fd, int mode) {
+int KernelProxy::fchmod(int fd, mode_t mode) {
   ScopedKernelHandle handle;
   Error error = AcquireHandle(fd, &handle);
   if (error) {
     errno = error;
     return -1;
   }
 
+  error = handle->node()->Fchmod(mode);
+  if (error) {
+    errno = error;
+    return -1;
+  }
+
   return 0;
 }
 
 int KernelProxy::fcntl(int fd, int request, va_list args) {
   Error error = 0;
 
   // F_GETFD and F_SETFD are descriptor specific flags that
   // are stored in the KernelObject's decriptor map unlike
   // F_GETFL and F_SETFL which are handle specific.
   switch (request) {
@@ skipping 913 matching lines @@
     errno = ENOTSOCK;
     return -1;
   }
 
   return 0;
 }
 
 #endif  // PROVIDES_SOCKET_API
 
 }  // namespace_nacl_io