synchronize disk block in-core status with that on
() 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
() 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.
() function conforms to
IEEE Std 1003.1-2008
() function appeared in
Version 2 AT&T UNIX
() may return before the buffers are