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diff --git a/lib/freertos-posix/include/FreeRTOS_POSIX/errno.h b/lib/freertos-posix/include/FreeRTOS_POSIX/errno.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 errno.h
+ * @brief System error numbers.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
+ *
+ * The values defined in this file may not be compatible with the strerror
+ * function provided by this system.
+ */
+
+#ifndef _FREERTOS_POSIX_ERRNO_H_
+#define _FREERTOS_POSIX_ERRNO_H_
+
+/* Undefine all errnos to avoid redefinition errors with system errnos. */
+#undef EPERM
+#undef ENOENT
+#undef EBADF
+#undef EAGAIN
+#undef ENOMEM
+#undef EEXIST
+#undef EBUSY
+#undef EINVAL
+#undef ENOSPC
+#undef ERANGE
+#undef ENAMETOOLONG
+#undef EDEADLK
+#undef EOVERFLOW
+#undef ENOSYS
+#undef EMSGSIZE
+#undef ENOTSUP
+#undef ETIMEDOUT
+
+/**
+ * @name Definition of POSIX errnos.
+ */
+/**@{ */
+#define EPERM           1   /**< Operation not permitted. */
+#define ENOENT          2   /**< No such file or directory. */
+#define EBADF           9   /**< Bad file descriptor. */
+#define EAGAIN          11  /**< Resource unavailable, try again. */
+#define ENOMEM          12  /**< Not enough space. */
+#define EEXIST          17  /**< File exists. */
+#define EBUSY           16  /**< Device or resource busy. */
+#define EINVAL          22  /**< Invalid argument. */
+#define ENOSPC          28  /**< No space left on device. */
+#define ERANGE          34  /**< Result too large. */
+#define ENAMETOOLONG    36  /**< File name too long. */
+#define EDEADLK         45  /**< Resource deadlock would occur. */
+#define EOVERFLOW       75  /**< Value too large to be stored in data type. */
+#define ENOSYS          88  /**< Function not supported. */
+#define EMSGSIZE        90  /**< Message too long. */
+#define ENOTSUP         95  /**< Operation not supported. */
+#define ETIMEDOUT       116 /**< Connection timed out. */
+/**@} */
+
+/**
+ * @name System Variable
+ *
+ * @brief Define FreeRTOS+POSIX errno, if enabled.
+ * Set configUSE_POSIX_ERRNO to enable, and clear to disable. See FreeRTOS.h.
+ *
+ * @{
+ */
+#if ( configUSE_POSIX_ERRNO == 1 )
+    extern int FreeRTOS_errno;
+    #define errno    FreeRTOS_errno
+#endif
+/**@} */
+
+#endif /* ifndef _FREERTOS_POSIX_ERRNO_H_ */