sync(2)                                                   sync(2)



     NAME
          sync - update superblock

     SYNOPSIS
          void sync()

     DESCRIPTION
          The sync system call causes all information in memory that
          should be on disk to be written out.  This includes modified
          superblocks, modified inodes, and delayed block I/O.

          It should be used by programs which examine a file system,
          for example fsck, df, etc.  It is mandatory before a reboot
          or a system shutdown.

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

     SEE ALSO
          sync(1), fsync(2).



































     April, 1990                                                     1