sync2

Usage

Overview

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.