DragonFly On-Line Manual Pages
SYNC(2) DragonFly System Calls Manual SYNC(2)
sync -- schedule filesystem updates
Standard C Library (libc, -lc)
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 syncer(4) (about every 30 seconds).
The function fsync(2) may be used to synchronize individual file descrip-
fsync(2), syncer(4), sync(8)
A sync() function call appeared in Version 6 AT&T UNIX.
Sync() may return before the buffers are completely flushed.
DragonFly 3.5 June 4, 1993 DragonFly 3.5