Problems with the tty's in openssh + AIX

Tobias Ulbricht up5a at
Thu Dec 12 11:13:41 EST 2002

Yes. That did it for me as well.
I'll see if my problems with putty and secureCRT will be gone as well.

My first thoughts were:
it might be related to a tty/terminal thing:
debug1: Ignoring unsupported tty mode opcode 13 (0xd)
debug1: Ignoring unsupported tty mode opcode 18 (0x12)
or it might be related to
debug1: fd 4 setting TCP_NODELAY
since the test program mostly duplicates the FD onto 4 (for whatever

cheers, tobias.

> It looks like the problem identified by Sandor Sklar in bug #124: a zero
> length write to the tty results in a zero-length read from it.
> I believe this is a bug in AIX.  The attached patch works around it for
> me but I don't think this is a correct fix.
> From AIX's man page for read():
> A value of 0 is returned when the end of the file has been reached. (For
> information about communication files, see the ioctl and termio files.)
> The read is returning zero for something other than EOF.
> --
> Darren Tucker (dtucker at
> GPG Fingerprint D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
>     Good judgement comes with experience. Unfortunately, the experience
> usually comes from bad judgement.

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