--- /dev/null
+/* Copyright (C) 1991-2018 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_UIO_H
+#define _SYS_UIO_H 1
+
+#include <features.h>
+#include <sys/types.h>
+#include <bits/types/struct_iovec.h>
+#include <bits/uio_lim.h>
+#ifdef __IOV_MAX
+# define UIO_MAXIOV __IOV_MAX
+#else
+# undef UIO_MAXIOV
+#endif
+
+__BEGIN_DECLS
+
+/* Read data from file descriptor FD, and put the result in the
+ buffers described by IOVEC, 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 IOVEC instead of a contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count)
+ __wur;
+
+/* Write data pointed by the buffers described by IOVEC, 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 IOVEC instead of a contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)
+ __wur;
+
+
+#ifdef __USE_MISC
+# ifndef __USE_FILE_OFFSET64
+/* Read data from file descriptor FD at the given position OFFSET
+ without change the file pointer, and put the result in the buffers
+ described by IOVEC, which is a vector of COUNT 'struct iovec's.
+ The buffers are filled in the order specified. Operates just like
+ 'pread' (see <unistd.h>) except that data are put in IOVEC instead
+ of a contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
+ __off_t __offset) __wur;
+
+/* Write data pointed by the buffers described by IOVEC, which is a
+ vector of COUNT 'struct iovec's, to file descriptor FD at the given
+ position OFFSET without change the file pointer. The data is
+ written in the order specified. Operates just like 'pwrite' (see
+ <unistd.h>) except that the data are taken from IOVEC instead of a
+ contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
+ __off_t __offset) __wur;
+
+# else
+# ifdef __REDIRECT
+extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,
+ int __count, __off64_t __offset),
+ preadv64) __wur;
+extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec,
+ int __count, __off64_t __offset),
+ pwritev64) __wur;
+# else
+# define preadv preadv64
+# define pwritev pwritev64
+# endif
+# endif
+
+# ifdef __USE_LARGEFILE64
+/* Read data from file descriptor FD at the given position OFFSET
+ without change the file pointer, and put the result in the buffers
+ described by IOVEC, which is a vector of COUNT 'struct iovec's.
+ The buffers are filled in the order specified. Operates just like
+ 'pread' (see <unistd.h>) except that data are put in IOVEC instead
+ of a contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count,
+ __off64_t __offset) __wur;
+
+/* Write data pointed by the buffers described by IOVEC, which is a
+ vector of COUNT 'struct iovec's, to file descriptor FD at the given
+ position OFFSET without change the file pointer. The data is
+ written in the order specified. Operates just like 'pwrite' (see
+ <unistd.h>) except that the data are taken from IOVEC instead of a
+ contiguous buffer.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,
+ __off64_t __offset) __wur;
+# endif
+#endif /* Use misc. */
+
+
+#ifdef __USE_GNU
+# ifndef __USE_FILE_OFFSET64
+/* Same as preadv but with an additional flag argumenti defined at uio.h. */
+extern ssize_t preadv2 (int __fp, const struct iovec *__iovec, int __count,
+ __off_t __offset, int ___flags) __wur;
+
+/* Same as preadv but with an additional flag argument defined at uio.h. */
+extern ssize_t pwritev2 (int __fd, const struct iovec *__iodev, int __count,
+ __off_t __offset, int __flags) __wur;
+
+# else
+# ifdef __REDIRECT
+extern ssize_t __REDIRECT (pwritev2, (int __fd, const struct iovec *__iovec,
+ int __count, __off64_t __offset,
+ int __flags),
+ pwritev64v2) __wur;
+extern ssize_t __REDIRECT (preadv2, (int __fd, const struct iovec *__iovec,
+ int __count, __off64_t __offset,
+ int __flags),
+ preadv64v2) __wur;
+# else
+# define preadv2 preadv64v2
+# define pwritev2 pwritev64v2
+# endif
+# endif
+
+# ifdef __USE_LARGEFILE64
+/* Same as preadv but with an additional flag argumenti defined at uio.h. */
+extern ssize_t preadv64v2 (int __fp, const struct iovec *__iovec,
+ int __count, __off64_t __offset,
+ int ___flags) __wur;
+
+/* Same as preadv but with an additional flag argument defined at uio.h. */
+extern ssize_t pwritev64v2 (int __fd, const struct iovec *__iodev,
+ int __count, __off64_t __offset,
+ int __flags) __wur;
+# endif
+#endif /* Use GNU. */
+
+__END_DECLS
+
+/* Some operating systems provide system-specific extensions to this
+ header. */
+#ifdef __USE_GNU
+# include <bits/uio-ext.h>
+#endif
+
+#endif /* sys/uio.h */
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