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When UML terminates, it kills its entire process group. The way PuTTY invokes proxy processes, they are part of its process group. So if UML is used directly as the proxy process, it will commit patricide on termination. Wrapping it in 'setsid' is overkill (it doesn't need to be part of a separate _session_, only a separate pgrp), but it's good enough to work around this problem, and give PuTTY the opportunity to shut down cleanly when the UML it's talking to vanishes.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.