V3/man/man2/gtty.2

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.he 'GTTY (II)'3/15/72'GTTY (II)'
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NAME		gtty  --  get typewriter status
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SYNOPSIS	(file descriptor in r0)
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sys gtty; arg  / gtty = 32.
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...
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arg: .=.+6
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DESCRIPTION	gtty____
stores in the three words addressed by arg___ the status
of the typewriter whose file descriptor is given in r0.
The format is the same as that passed by stty____.
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SEE ALSO	stty(II)
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DIAGNOSTICS	Error bit
(c-bit) is set if the file descriptor does not refer
to a typewriter.
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BUGS		--