The tty command prints the entries in the tty table for console multiscreens, parallel ports, serial ports, and pseudo-ttys. If you specify the -f option, the information displayed includes:
The cblock command allows you to examine the contents of
the character blocks for a clist given its table entry
displayed by the tty command. This may be useful
if you wish to examine the a serial line which you think may
be generating spurious characters.
``A character list formed from a chain of character blocks''
illustrates how a character list is built from a clist
header and a chain of cblock elements.
The clist header contains pointers to the first and last
cblock only. The total count of characters in the
c_data buffers is stored in the
of the clist.
A character list formed from a chain of character blocks