4.3BSD - /usr/man/cat2/sync.0

SYNC(2)                                                                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.

       Sync should be used by programs that examine a file system, for example
       fsck, df, etc.  Sync is mandatory before a boot.

SEE ALSO
       fsync(2), sync(8), update(8)

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


4th Berkeley Distribution        June 30, 1985                         SYNC(2)