[issue1239] openpty does not give bidirectional pipe

[Matti Katila]

Changes by Matti Katila:


--
components: None
severity: normal
status: open
title: openpty does not give bidirectional pipe
type: behavior
versions: Python 2.5

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[issue1239] openpty does not give bidirectional pipe

[Matti Katila]

New submission from Matti Katila:

http://rafb.net/p/t8cqSt71.html

--
nosy: +mudyc

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[issue1239] openpty does not give bidirectional pipe

[Matti Katila]

Matti Katila added the comment:

Linux Programmer’s Manual for ptmx and pts - pseudo-terminal master and
slave states:

"Data written to the slave is presented  on  the  master descriptor  as
input. Data written to the master is presented to the slave as input."

The data can be read from slave to master but not from master to slave.

The unit test does not test this issue either:
http://coverage.livinglogic.de/Lib/test/test_openpty.py.html

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[issue1239] openpty does not give bidirectional pipe

[Matti Katila]

Matti Katila added the comment:

Not a real issue - it's a standard behaviour of tty.

Fix is to set -icanon:

m,s = os.openpty()
s = os.ttyname(s)
os.system( 'stty cs8 -icanon -echo < %s' % s )

see, http://www.eulogika.net/download/eutalk_20040302/pymouse.html

The issue can be closed and documentation can be updated with some
helpful information.

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