Here is a patch to make the secomp trap handler on Linux more helpfully verbose.

[James Browning]

I wrote and tested this on a bleeding-edge Ubuntu box. I have yet to
try this on other Linux flavors.

I also have a patch that can incrementally tighten the syscall filter
to calls listed in a text file. I will work on that one a bit more
first, however. The code for both is also at

https://gitlab.com/na280/ntpsec/-/commits/23B27-seccomp
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