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SYNC(2) FreeBSD System Calls Manual SYNC(2) NAME sync -- schedule filesystem updates LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> void sync(void); DESCRIPTION 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 syncer(4) (about every 30 seconds). The function fsync(2) may be used to synchronize individual file descrip- tor attributes. SEE ALSO fsync(2), syncer(4), sync(8) BUGS Sync() may return before the buffers are completely flushed. HISTORY A sync() function call appeared in Version 6 AT&T UNIX. FreeBSD 4.10 June 4, 1993 FreeBSD 4.10
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS | HISTORY
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