NAME
sync - update super-block

SYNOPSIS
void 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.

Sync should be used by programs that examine a file system, for
example fsck, df, etc. Sync is mandatory before a boot.

SEE ALSO
fsync(2), sync(8)

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