[NaCl SDK] nacl_io: Add chmod/fchmod

native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
index cf6cf07cf0517bc3dfd4cf09c2e29ede0b8ccf3d..b5cf443c7dbc77e49d1411adb30471a678467b65 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
@@ -799,8 +799,7 @@ int KernelProxy::remove(const char* path) {
   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) {
@@ -808,6 +807,12 @@ int KernelProxy::fchmod(int fd, int mode) {
     return -1;
   }
 
+  error = handle->node()->Fchmod(mode);
+  if (error) {
+    errno = error;
+    return -1;
+  }
+
   return 0;
 }