2.9BSD/usr/man/cat2/sync.2

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SYNC(2)             UNIX Programmer's Manual              SYNC(2)

NAME
     sync - update super-block

SYNOPSIS
     sync()

DESCRIPTION
     _S_y_n_c 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 _i_c_h_e_c_k.  It is mandatory before a boot.

SEE ALSO
     sync(8), update(8)

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

ASSEMBLER
     (sync = 36.)
     sys sync

Printed 5/22/83                                                 1