088c17b46b
Implement `sysctl` in `ddb` by overriding `SYSCTL_OUT`. When handling the req, we install custom ddb in/out handlers. The out handler prints straight to the debugger, while the in handler ignores all input. This is intended to allow us to print just about any sysctl. There is a known issue when used from ddb(4) entered via 'sysctl debug.kdb.enter=1'. The DDB mode does not quite prevent all lock interactions, and it is possible for the recursive Giant lock to be unlocked when the ddb(4) 'sysctl' command is used. This may result in a panic on return from ddb(4) via 'c' (continue). Obviously, this is not a problem when debugging already-paniced systems. Submitted by: Travis Lane (formerly: <travis.lane AT isilon.com>) Reviewed by: vangyzen (earlier version), Don Morris <dgmorris AT earthlink.net> Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D20219
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