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+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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
+.\"
+.Dd June 4, 1993
+.Dt FSYNC 2
+.Os BSD 4.2
+.Sh NAME
+.Nm fsync
+.Nd "synchronize a file's in-core state with that on disk"
+.Sh SYNOPSIS
+.Fd #include <unistd.h>
+.Ft int
+.Fn fsync "int fd"
+.Sh DESCRIPTION
+.Fn Fsync
+causes all modified data and attributes of
+.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
+.Fn Fsync
+should be used by programs that require a file to be
+in a known state, for example, in building a simple transaction
+facility.
+.Sh RETURN VALUES
+A 0 value is returned on success.  A -1 value indicates
+an error.
+.Sh ERRORS
+The
+.Fn fsync
+fails if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+.Fa Fd
+is not a valid descriptor.
+.It Bq Er EINVAL
+.Fa Fd
+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.
+.El
+.Sh SEE ALSO
+.Xr sync 2 ,
+.Xr sync 8 ,
+.Xr update 8
+.Sh HISTORY
+The
+.Nm
+function call appeared in
+.Bx 4.2 .