sync man page on DragonFly

sync man page on DragonFly

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SYNC(2)			    BSD 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)

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

BUGS
     Sync() may return before the buffers are completely flushed.

BSD				 June 4, 1993				   BSD

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