From 587c867d4bac6e49155b918f3c8c46f9a62e594b Mon Sep 17 00:00:00 2001
From: Angus Gratton <gus@projectgus.com>
Date: Tue, 28 Jun 2016 10:09:08 +1000
Subject: [PATCH] queue.h: Re-add the BSD Copyright notice to queue.h from
 Espressif's SDK.

Thanks @pfalcon for the heads-up on this:
https://groups.google.com/forum/#!topic/esp8266-re/I4iO3fM0mmA
---
 include/espressif/queue.h | 55 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/include/espressif/queue.h b/include/espressif/queue.h
index a760c8d..7725a3b 100644
--- a/include/espressif/queue.h
+++ b/include/espressif/queue.h
@@ -1,6 +1,61 @@
+/*
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
 #ifndef _SYS_QUEUE_H_
 #define	_SYS_QUEUE_H_
 
+/*
+ * Note: This header file comes to us from the Espressif
+ * SDK. Espressif adapted it from BSD's queue.h. The BSD copyright
+ * notice and the following extract from the explanatory statement
+ * were re-added by esp-open-rtos.
+ *
+ * FreeBSD version of this header:
+ * https://svnweb.freebsd.org/base/head/sys/sys/queue.h?view=markup
+ *
+ * ****
+ *
+ * A singly-linked list is headed by a single forward pointer. The elements
+ * are singly linked for minimum space and pointer manipulation overhead at
+ * the expense of O(n) removal for arbitrary elements. New elements can be
+ * added to the list after an existing element or at the head of the list.
+ * Elements being removed from the head of the list should use the explicit
+ * macro for this purpose for optimum efficiency. A singly-linked list may
+ * only be traversed in the forward direction.  Singly-linked lists are ideal
+ * for applications with large datasets and few or no removals or for
+ * implementing a LIFO queue.
+ *
+ * For details on the use of these macros, see the queue(3) manual page.
+ *
+ */
+
 #define	QMD_SAVELINK(name, link)
 #define	TRASHIT(x)