V7/usr/man/man2/sync.2

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.TH SYNC 2 
.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
It should be used by programs which examine a file system,
for example
.I "icheck, df,"
etc.
It is mandatory before a boot.
.SH "SEE ALSO"
sync(1), update(8)
.SH BUGS
The writing, although scheduled, is not necessarily
complete upon return from 
.IR sync .
.SH ASSEMBLER
(sync = 36.)
.br
.B sys sync