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diff --git a/FreeRTOS-Labs/Demo/FreeRTOS_Plus_POSIX_with_actor_Windows_Simulator/lib/include/FreeRTOS_POSIX/unistd.h b/FreeRTOS-Labs/Demo/FreeRTOS_Plus_POSIX_with_actor_Windows_Simulator/lib/include/FreeRTOS_POSIX/unistd.h
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+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 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 unistd.h
+ * @brief Standard symbolic constants and types
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_UNISTD_H_
+#define _FREERTOS_POSIX_UNISTD_H_
+
+#include "FreeRTOS_POSIX/sys/types.h"
+
+/**
+ * @brief Suspend execution for an interval of time.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/sleep.html
+ *
+ * @param[in] seconds The number of seconds to suspend execution.
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note Return value of a positive number is not yet supported.
+ */
+unsigned sleep( unsigned seconds );
+
+/**
+ * @brief Suspend execution for microsecond intervals.
+ *
+ * This is a useful, non-POSIX function.
+ * @param[in] usec The number of microseconds to suspend execution.
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int usleep( useconds_t usec );
+
+#endif /* ifndef _FREERTOS_POSIX_UNISTD_H_ */