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SYNC(2)			  FreeBSD System Calls Manual		       SYNC(2)

NAME
     sync -- schedule file system updates

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <unistd.h>

     void
     sync(void);

DESCRIPTION
     The sync()	system call 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()	system
     call is issued frequently by the user process syncer(4) (about every 30
     seconds).

     The fsync(2) system call may be used to synchronize individual file
     descriptor	attributes.

SEE ALSO
     fsync(2), syncer(4), sync(8)

HISTORY
     The sync()	function appeared in Version 6 AT&T UNIX.

BUGS
     The sync()	system call may	return before the buffers are completely
     flushed.

FreeBSD	9.2			 June 4, 1993			   FreeBSD 9.2

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

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