+/*
+ * Copyright (c) 2014 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef _UNISTD_H
+#define _UNISTD_H 1
+
+#define fsync _commit
+
+/* Standard file descriptors. */
+#define STDIN_FILENO 0 /* Standard input. */
+#define STDOUT_FILENO 1 /* Standard output. */
+#define STDERR_FILENO 2 /* Standard error output. */
+
+#endif /* unistd.h */