Artifact c92feaf081bb749e98d11c7ff270a05f8f8c0aec:

• File ssh.c — part of check-in [9377dd8f27] at 2011-12-08 13:15:58 on branch trunk — Introduce a function sshfwd_unclean_close(), supplied by ssh.c to subsidiary network modules like portfwd.c. To be called when the subsidiary module experiences a socket error: it sends an emergency CHANNEL_CLOSE (not just outgoing CHANNEL_EOF), and immediately deletes the local side of the channel. (I've invented a new channel type in ssh.c called CHAN_ZOMBIE, for channels whose original local side has already been thrown away and they're just hanging around waiting to receive the acknowledging CHANNEL_CLOSE.) As a result of this and the last few commits, I can now run a port forwarding session in which a local socket error occurs on a forwarded port, and PuTTY now handles it apparently correctly, closing both the SSH channel and the local socket and then actually recognising that it's OK to terminate when all _other_ channels have been closed. Previously the channel corresponding to the duff connection would linger around (because of net_pending_errors never being called), and keep being selected on (hence chewing CPU), and inhibit program termination at the end of the session (because not all channels were closed). (user: simon size: 308577)

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