SYNC(2) BSD Programmer's Manual SYNC(2)
sync - synchronize disk block in-core status with that on disk
#include <unistd.h> void sync(void);
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 in- formation in the cache is lost after a system crash a sync() call is is- sued frequently by the in-kernel process update(8) (about every 30 seconds). The function fsync(2) may be used to synchronize individual file descrip- tor attributes.
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. MirOS BSD #10-current June 4, 1993 1
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