SYNOPSIS
#include <unistd.h>
void sync(void);
DESCRIPTION
sync()
causes all information in memory that should be on disk to be written out.
This includes modified file system meta-data and delayed block I/O.
It should be used by commands and programs
that examine a file system, such as
fsck,
df,
etc.
It is mandatory before a shutdown.
The writing, although scheduled,
is not necessarily complete upon return from
sync.
In some HP-UX systems,
sync()
may be reduced to a no-op.
This is permissible on a system which does not cache buffers,
or in a system that in some way ensures that the disks
are always in a consistent state.
AUTHOR
sync()
was developed by HP
and AT&T Bell Laboratories.
STANDARDS CONFORMANCE
sync(): SVID2, SVID3, XPG2
