|SYNC(2)||System Calls Manual||SYNC(2)|
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 in-kernel process update (about every 30 seconds).
The function fsync(2) may be used to synchronize individual file descriptor attributes.
sync() function conforms to IEEE Std 1003.1-2008 (“POSIX.1”).
sync() function appeared in Version 2 AT&T UNIX.
sync() may return before the buffers are completely flushed.
|January 9, 2016||OpenBSD-current|