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-.\" Copyright (c) 1983, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
-.\" All rights reserved.
-.\"
-.\" Parts of this documentation were written by
-.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
-.\" from the FreeBSD Foundation.
-.\"
-.\" 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.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
-.\"
-.\"     @(#)fsync.2	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd March 30, 2020
-.Dt FSYNC 2
-.Os
-.Sh NAME
-.Nm fdatasync ,
-.Nm fsync
-.Nd "synchronise changes to a file"
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn fdatasync "int fd"
-.Ft int
-.Fn fsync "int fd"
-.Sh DESCRIPTION
-The
-.Fn fsync
-system call
-causes all modified data and attributes of the file referenced by
-the file descriptor
-.Fa fd
-to be moved to a permanent storage device.
-This normally results in all in-core modified copies
-of buffers for the associated file to be written to a disk.
-.Pp
-The
-.Fn fdatasync
-system call causes all modified data of
-.Fa fd
-to be moved to a permanent storage device.
-Unlike
-.Fn fsync ,
-the system call does not guarantee that file attributes or
-metadata necessary to access the file are committed to the permanent storage.
-.Pp
-The
-.Fn fsync
-system call
-should be used by programs that require a file to be
-in a known state, for example, in building a simple transaction
-facility.
-If the file metadata has already been committed, using
-.Fn fdatasync
-can be more efficient than
-.Fn fsync .
-.Pp
-Both
-.Fn fdatasync
-and
-.Fn fsync
-calls are cancellation points.
-.Sh RETURN VALUES
-.Rv -std fsync
-.Sh ERRORS
-The
-.Fn fsync
-and
-.Fn fdatasync
-calls fail if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Fa fd
-argument
-is not a valid descriptor.
-.It Bq Er EINVAL
-The
-.Fa fd
-argument
-refers to a socket, not to a file.
-.It Bq Er EIO
-An I/O error occurred while reading from or writing to the file system.
-.It Bq Er EINTEGRITY
-Corrupted data was detected while reading from the file system.
-.El
-.Sh SEE ALSO
-.Xr fsync 1 ,
-.Xr sync 2 ,
-.Xr syncer 4 ,
-.Xr sync 8
-.Sh HISTORY
-The
-.Fn fsync
-system call appeared in
-.Bx 4.2 .
-The
-.Fn fdatasync
-system call appeared in
-.Fx 11.1 .
-.Sh BUGS
-The
-.Fn fdatasync
-system call currently does not guarantee that enqueued
-.Xr aio 4
-requests for the file referenced by
-.Fa fd
-are completed before the syscall returns.