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SYNC(2)                     BSD System Calls Manual                    SYNC(2)

NAME
     sync -- synchronize disk block in-core status with that on disk

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     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 in-kernel process update (about every 30 sec-
     onds).

     The function fsync(2) may be used to synchronize individual file descrip-
     tor attributes.

SEE ALSO
     fsync(2), sync(8)

STANDARDS
     The sync() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').

HISTORY
     A sync() function call appeared in Version 2 AT&T UNIX.

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

BSD                             August 14, 2013                            BSD