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sync(2) [v7 man page]

SYNC(2) 							System Calls Manual							   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(1), update(8) BUGS
The writing, although scheduled, is not necessarily complete upon return from sync. ASSEMBLER
(sync = 36.) sys sync SYNC(2)
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