sync(2)

NAME

     sync - update super block

SYNOPSIS

     #include <unistd.h>

     void sync(void);

DESCRIPTION

     The sync() function writes all information  in  memory  that
     should be on disk, including modified super blocks, modified
     inodes, and delayed block I/O.

     Unlike fsync(3C), which  completes  the  writing  before  it
     returns,  sync() schedules but does not necessarily complete
     the writing before returning.

USAGE

     The sync() function should  be  used  by  applications  that
     examine  a file system, such as fsck(1M), and df(1M), and is
     mandatory before rebooting.

SEE ALSO

     df(1M), fsck(1M), fsync(3C)