> The problem occurs when I try to run a test program that opens each device 
> and reads from it. The dm device works fine. The tsh devices fail the open()
> with ENOENT (open '/dev/tsh{0,1}' failed, No such file or directory). It

I guess you are trying to open "/dev/tsh{0,1}" , not "/dev/tsh0".
"No such file or directory" means that you have no such /dev/ entry.

-- 
Zdenek Salvet                                              salvet@ics.muni.cz 
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           If God had meant for us to be in the Army,
         we would have been born with green, baggy skin.