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+.\"	$NetBSD: fdatasync.2,v 1.17 2020/03/25 18:08:34 gdt Exp $
+.\"
+.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Klaus Klein.
+.\"
+.\" 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.
+.\"
+.\" 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.
+.\"
+.Dd October 25, 2003
+.Dt FDATASYNC 2
+.Os
+.Sh NAME
+.Nm fdatasync
+.Nd synchronize the data of a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn fdatasync "int fd"
+.Sh DESCRIPTION
+The
+.Fn fdatasync
+function forces all modified data associated with the file descriptor
+.Fa fd
+to be flushed to stable storage.
+.Pp
+The functionality is as described for
+.Xr fsync 2 ,
+with the exception that file status information need not be synchronized,
+which may result in a performance gain, compared to
+.Xr fsync 2 .
+This behaviour is commonly known as
+.Bf -symbolic
+synchronized I/O data integrity completion.
+.Ef
+.Sh RETURN VALUES
+A value of 0 is returned on success.
+Otherwise, a value \-1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn fdatasync
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument is not a valid file descriptor.
+.It Bq Er EINVAL
+This implementation does not support synchronized I/O for this file.
+.It Bq Er ENOSYS
+The
+.Fn fdatasync
+function is not supported by this implementation.
+.El
+.Pp
+In the event that any of the I/O operations to be performed fail,
+.Fn fdatasync
+returns the error conditions defined for
+.Xr read 2
+and
+.Xr write 2 ,
+and outstanding I/O operations are not guaranteed to have been completed.
+.Sh SEE ALSO
+.Xr fsync 2 ,
+.Xr open 2 ,
+.Xr read 2 ,
+.Xr write 2
+.Sh STANDARDS
+The
+.Fn fdatasync
+function conforms to
+.St -p1003.1-2008 .