sync - synchronize disk block in-core status with that on
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
As information in the cache is lost after a system crash a
sync() call is
issued frequently by the in-kernel process update(8) (about
every 30 seconds).
The function fsync(2) may be used to synchronize individual
fsync(2), sync(8), update(8)
A sync() function call appeared in Version 2 AT&T UNIX.
sync() may return before the buffers are completely flushed.
OpenBSD 3.6 June 4, 1993
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