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     SYNC(2)                                                   SYNC(2)

     NAME
          sync - force writing of system buffers

     SYNOPSIS
          void sync()

     DESCRIPTION
          Sync schedules all information in memory that should be on
          disk or other block media to be written out.  This includes
          modified super-blocks, modified inodes, and delayed block
          I/O.

          It should be used by programs which examine a file system,
          for example icheck(8). It is highly recommended before a
          shutdown or reboot.

     SEE ALSO
          sync(8)

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