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BSD 4.3reno

.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)sync.2	6.2 (Berkeley) 6/30/85
.\"
.TH SYNC 2 "June 30, 1985"
.UC 4
.SH NAME
sync \- update super-block
.SH SYNOPSIS
.B sync()
.SH DESCRIPTION
.I Sync
causes all information in core
memory that should be on disk to be written out.
This includes modified super blocks,
modified i-nodes, and delayed block I/O.
.PP
.I Sync
should be used by programs that examine a file system,
for example
.I "fsck, df,"
etc.
.I Sync
is mandatory before a boot.
.SH "SEE ALSO"
fsync(2), sync(8), update(8)
.SH BUGS
The writing, although scheduled, is not necessarily
complete upon return from 
.IR sync .

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