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+.\" $NetBSD: aio_fsync.3,v 1.8 2017/07/03 21:32:51 wiz Exp $
+.\"
+.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" 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 May 17, 2010
+.Dt AIO_FSYNC 3
+.Os
+.Sh NAME
+.Nm aio_fsync
+.Nd asynchronous data synchronization of file (REALTIME)
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_fsync "int op" "struct aiocb *aiocbp"
+.Sh DESCRIPTION
+The
+.Fn aio_fsync
+system call allows the calling process to force all modified data
+associated with the file descriptor
+.Fa aiocbp->aio_fildes
+to be flushed to the stable storage device.
+The call returns immediately after the synchronization request has been
+enqueued to the descriptor; the synchronization may or may not have
+completed at the time the call returns.
+If the request could not be enqueued, generally due to invalid arguments,
+the call returns without having enqueued the request.
+.Pp
+The
+.Fa op
+argument could be set only to
+.Dv O_DSYNC
+or
+.Dv O_SYNC .
+If
+.Fa op
+is
+.Dv O_DSYNC ,
+then
+.Fn aio_fsync
+does the same as a
+.Fn fdatasync
+call, if
+.Dv O_SYNC ,
+then the same as
+.Fn fsync .
+.Pp
+If
+.Dv _POSIX_PRIORITIZED_IO
+is defined, and the descriptor supports it, then the enqueued
+operation is submitted at a priority equal to that of the calling
+process minus
+.Fa aiocbp->aio_reqprio .
+.Pp
+The
+.Fa aiocbp
+pointer may be subsequently used as an argument to
+.Fn aio_return
+and
+.Fn aio_error
+in order to determine return or error status for the enqueued operation
+while it is in progress.
+.Sh RETURN VALUES
+.Rv -std aio_fsync
+.Sh ERRORS
+The
+.Fn aio_fsync
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The request was not queued because of system resource limitations.
+.El
+.Pp
+The following conditions may be synchronously detected when the
+.Fn aio_fsync
+system call is made, or asynchronously, at any time thereafter.
+If they are detected at call time,
+.Fn aio_fsync
+returns \-1 and sets
+.Va errno
+appropriately; otherwise the
+.Fn aio_return
+system call must be called, and will return \-1, and
+.Fn aio_error
+must be called to determine the actual value that would have been
+returned in
+.Va errno .
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa aiocbp->aio_fildes
+is invalid for writing.
+.It Bq Er EINVAL
+This implementation does not support synchronized I/O for this file,
+or the
+.Fa op
+argument is neither set to
+.Dv O_DSYNC
+nor
+.Dv O_SYNC .
+.El
+.Sh SEE ALSO
+.Xr fcntl 2 ,
+.Xr fdatasync 2 ,
+.Xr fsync 2 ,
+.Xr aio 3
+.Sh STANDARDS
+The
+.Fn aio_fsync
+system call is expected to conform to the
+.St -p1003.1-2001
+standard.
+.Sh HISTORY
+The
+.Fn aio_fsync
+system call first appeared in
+.Nx 5.0 .