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SYNC(2)                  DragonFly 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.

DragonFly 3.5                    June 4, 1993                    DragonFly 3.5

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