NAME
sync —
synchronize disk block in-core status
with that on disk
SYNOPSIS
#include
<unistd.h>
void
sync(void);
DESCRIPTION
Thesync()
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.