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Using the crash(ADM) diagnostic tool

Examining tty and cblock structures

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 c_cc member of the clist.

A character list formed from a chain of character blocks



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© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003