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+/* Copyright (C) 1996, 1997, 2006 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#if !defined _SYS_UIO_H && !defined _FCNTL_H
+# error "Never include <bits/uio.h> directly; use <sys/uio.h> instead."
+#endif
+
+#ifndef _BITS_UIO_H
+#define _BITS_UIO_H 1
+
+#include <sys/types.h>
+
+
+/* We should normally use the Linux kernel header file to define this
+ type and macros but this calls for trouble because of the header
+ includes other kernel headers. */
+
+/* Size of object which can be written atomically.
+
+ This macro has different values in different kernel versions. The
+ latest versions of the kernel use 1024 and this is good choice. Since
+ the C library implementation of readv/writev is able to emulate the
+ functionality even if the currently running kernel does not support
+ this large value the readv/writev call will not fail because of this. */
+#define UIO_MAXIOV 1024
+
+
+/* Structure for scatter/gather I/O. */
+struct iovec
+ {
+ void *iov_base; /* Pointer to data. */
+ size_t iov_len; /* Length of data. */
+ };
+
+#endif