v7 man page for sync

SYNC(2) 							System Calls Manual							   SYNC(2)

NAME
       sync - update super-block

SYNOPSIS
       sync( )

DESCRIPTION
       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.

       It should be used by programs which examine a file system, for example icheck, df, etc.	It is mandatory before a boot.

SEE ALSO
       sync(1), update(8)

BUGS
       The writing, although scheduled, is not necessarily complete upon return from sync.

ASSEMBLER
       (sync = 36.)
       sys sync

																	   SYNC(2)