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An instance of “tty” is associated with every terminal port to the system (no matter what type of hardware interface is used). A “port” in this context is a place to attach a terminal line. Hence a DL11 supplies only one port, whereas a DJ11 supplies up to sixteen ports.
The “tty” structure consists of sixteen words and includes:
A. |
t_dev |
fixed for a particular |
t_addr |
terminal port; |
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B. |
t_speeds |
fixed for a particular |
t_erase |
terminal. These values may |
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t_kill |
be set by “stty” and |
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t_flags |
interrogated by “gtty”; |
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C. |
t_rawq |
list heads for three |
t_canq |
character queues: the |
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t_outq |
so-called “raw” input, |
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“cooked” input and the |
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output queues; |
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D. |
t_state |
status information which |
t_delct |
changes frequently during |
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t_col |
normal processing; |
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t_char |
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