[CRIU] Dumping tmux session with a client connected

[Allan Cecil]

Greetings,

I am continuing my quest to develop a general-purpose "wrapper" where you can run a Python script which starts a shell and you can run a program such as top and hit a key combination such as Ctrl+U to save a checkpoint and then press Ctrl+O later to restore that checkpoint, all while viewing the shell.  Using top is a quick example but the ultimate goal is to get this working with NetHack as part of the nethack-tas-tools project (currently on Gitorious but soon to move to a new repository).

I'm having issues dumping when a client is connected to the tmux session. Given ps fax:

15349 ?        Ss     0:00 criu service -d
15323 ?        Ss     0:00 tmux
15324 pts/2    Ss     0:00  \_ -bash
15619 pts/2    S+     0:00      \_ top

Using "./criuDump.py 15323" (script attached) fails; the full dump folder is attached - the pertinent bit is:

(00.019450)     Ext stream not supported: ino 0xbfc1 peer_ino 0xc1fb family    1 type    1 state  1 name (null)
(00.019453) Error (sk-unix.c:564): Can't dump half of stream unix connection.

I'm using req.opts.ext_unix_sk = True because without it I get warnings that it's required.  So, my question is, is it possible to use RPC to dump tmux if a client is currently connected?  (I can reliably dump tmux when "no one is watching" which reminds me of Wheatley from Portal 2, but I digress... :)  I am not tied to using tmux for this, but it seems like the most sensible option that would provide the most flexibility.

Any suggestions would be appreciated.  Thanks!

A.C.
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