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.

          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(8), update(8)

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