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diff --git a/include/sys/uio.h b/include/sys/uio.h
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+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _SYS_UIO_H
+
+#define _SYS_UIO_H	1
+#include <features.h>
+
+__BEGIN_DECLS
+
+#define	__need_size_t
+#include <stddef.h>
+
+/* That is a klude for Linux. */
+#ifdef __linux__
+#include <linux/socket.h>
+#endif
+
+#ifndef __LINUX_UIO_H
+
+/* Structure describing a section of memory.  */
+
+struct iovec
+{
+  /* Starting address.  */
+  __ptr_t iov_base;
+  /* Length in bytes.  */
+  size_t iov_len;
+};
+
+#endif
+
+/* Read data from file descriptor FD, and put the result in the
+   buffers described by VECTOR, which is a vector of COUNT `struct iovec's.
+   The buffers are filled in the order specified.
+   Operates just like `read' (see <unistd.h>) except that data are
+   put in VECTOR instead of a contiguous buffer.  */
+int readv __P ((int __fd, __const struct iovec * __vector, size_t __count));
+
+/* Write data pointed by the buffers described by VECTOR, which
+   is a vector of COUNT `struct iovec's, to file descriptor FD.
+   The data is written in the order specified.
+   Operates just like `write' (see <unistd.h>) except that the data
+   are taken from VECTOR instead of a contiguous buffer.  */
+int writev __P ((int __fd, __const struct iovec * __vector, size_t __count));
+
+
+__END_DECLS
+
+#endif /* sys/uio.h */