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Xrootd does not use SIG 64 and SIG 63, it uses SIGRTMAX and SIGRTMAX - 1 :)

On fedora 30 these are:```
root [2] SIGRTMIN -> (int) 34
root [3] SIGRTMAX ->(int) 64
root [4] SIGRTMAX - SIGRTMIN -> (int) 30

so `SIGRTMAX - 1 = SIGRTMIN + 29`.

How about a plugin using signals and not blocking the RT signals (or unblocking them through ignorance) so they get delivered there from XRootd AIO code, even though they should not? Although I must admit I can not imagine the mess when signals are used for internal communication by two different sub-systems in a single multi-threaded program :)

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