why fd passing?

[Matthew Vernon]

Phil Howard <phil-openssh-unix-dev at ipal.net> writes:

> then it doesn't have to be done.  But if that isn't know at fork
> time, go ahead and set one up and then if the user privilege child
> decides it does not need one, it can just close the descriptors.

This doesn't work - the client may request a shell service at any
point, so you'd have to keep the pty ready-to-use for the entire
session. 

> I do not see from this illustration how mmap() is involved.

AIUI, the shared memory is for zlib use.

Matthew

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