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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	10.1			 June 4, 1993			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS | HISTORY

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