sync(2)

NAME
     sync - update super-block

SYNOPSIS
     #include <unistd.h>

     int sync(void)

DESCRIPTION
     Sync causes all information in the file system buffers that should be  on
     disk to be written out.  This includes modified super blocks, modified i-
     nodes, and delayed block I/O.

SEE ALSO
     reboot(2), sync(8).