NAME
sync —
synchronize disk block in-core status
with that on disk
SYNOPSIS
#include
<unistd.h>
void
sync(void);
DESCRIPTION
The
sync()
function forces a write of dirty (modified) buffers in the block buffer
cache out to disk. The kernel keeps this information in core to reduce the
number of disk I/O transfers required by the system. As information in the
cache is lost after a system crash a sync() call is
issued frequently by the user process
update(8)
(about every 30 seconds).
The function fsync(2) may be used to synchronize individual file descriptor attributes.
SEE ALSO
BUGS
sync() may return before the buffers are
completely flushed.
HISTORY
A sync() function call appeared in
Version 6 AT&T UNIX.