>If we are going to redo the line discipline stuff, I'd rather see
>TIOCSETD to take, or whatever is appropriate.

this isn't TIOCSETD (although it's related), this is TIOCSLINED, which
takes a char* instead of an int.

>struct linedisc {
>	char l_name[20];
>	int l_flags;
>	int l_unit;
>};

flags and unit could be added to the end of the char* with total
backward compatibility.

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