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diff --git a/FreeRTOS-Labs/Demo/FreeRTOS_Plus_POSIX_with_actor_Windows_Simulator/lib/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_unistd.c b/FreeRTOS-Labs/Demo/FreeRTOS_Plus_POSIX_with_actor_Windows_Simulator/lib/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_unistd.c
new file mode 100644
index 000000000..abe20028f
--- /dev/null
+++ b/FreeRTOS-Labs/Demo/FreeRTOS_Plus_POSIX_with_actor_Windows_Simulator/lib/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_unistd.c
@@ -0,0 +1,54 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_unistd.c
+ * @brief Implementation of functions in unistd.h
+ */
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/unistd.h"
+
+/*-----------------------------------------------------------*/
+
+unsigned sleep( unsigned seconds )
+{
+    vTaskDelay( pdMS_TO_TICKS( seconds * 1000 ) );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int usleep( useconds_t usec )
+{
+    /* To avoid delaying for less than usec, always round up. */
+    vTaskDelay( pdMS_TO_TICKS( usec / 1000 + ( usec % 1000 != 0 ) ) );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/