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hacking: document subdaemon debugging

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Signed-off-by: William Casarin <jb55@jb55.com>
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William Casarin 2018-01-13 22:00:26 -08:00 • committed by Rusty Russell
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doc/HACKING.md
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@ -86,6 +86,18 @@ Here's a list of parts, with notes:
* onchaind/ - daemon to hand a single channel which has had its funding transaction spent.
Debugging
---------
You can debug crashing subdaemons with the argument
`--dev-debugger=lightning_channeld`, where `channeld` is the subdaemon name. It
will print out a command such as:
gdb -ex 'attach 22398' lightning_channeld -ex return
Run this command to start debugging. You may need to type `return` one more time
to exit the infinite while loop, otherwise you can type `continue` to begin.
Testing
-------