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diff --git a/StdLib/Include/sys/poll.h b/StdLib/Include/sys/poll.h
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+/** @file
+    Definitions in support of the poll() function.
+
+ * Copyright (c) 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Charles M. Hannum.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *  This product includes software developed by the NetBSD
+ *  Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+
+    Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+    This program and the accompanying materials are licensed and made available under
+    the terms and conditions of the BSD License that accompanies this distribution.
+    The full text of the license may be found at
+    http://opensource.org/licenses/bsd-license.php.
+
+    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+    NetBSD: poll.h,v 1.11 2005/12/11 12:25:20 christos Exp
+**/
+#ifndef _SYS_POLL_H_
+#define _SYS_POLL_H_
+
+#include <sys/featuretest.h>
+#include <sys/EfiCdefs.h>
+
+typedef unsigned int  nfds_t;
+
+struct pollfd {
+  int   fd;       /* file descriptor */
+  short events;   /* events to look for */
+  short revents;  /* events returned */
+};
+
+/*
+ * Testable events (may be specified in events field).
+ */
+#define POLLIN      0x0001
+#define POLLPRI     0x0002
+#define POLLOUT     0x0004
+#define POLLRDNORM  0x0040
+#define POLLWRNORM  POLLOUT
+#define POLLRDBAND  0x0080
+#define POLLWRBAND  0x0100
+
+/*
+ * Non-testable events (ignored in events field, valid in return only).
+ */
+#define POLLERR     0x0008
+#define POLLHUP     0x0010
+#define POLLNVAL    0x0020    // Invalid parameter in POLL call
+#define POLL_RETONLY  (POLLERR | POLLHUP | POLLNVAL)
+
+/*
+ * Infinite timeout value.
+ */
+#define INFTIM    -1
+
+__BEGIN_DECLS
+int poll(struct pollfd *, nfds_t, int);
+__END_DECLS
+
+#endif /* !_SYS_POLL_H_ */