Currently, uml does not support device handling from user space nor has been ported to any os other than linux. However, it is just a user space process, so i'm not pessimistic about porting it to the Hurd.
I'm clueless about system call interception and ptrace() in GNU/Hurd. Most likely, they are not supported. However, can't we implement something like that? I've never implemented system call interception before :) but the theory is not that hard to understand. Ptrace() seems more difficult.
All in all, uml is not a sure bet but seems very promising IMHO. If it works, it could provide the Hurd with a very good tool for a long term usage.
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