"signalfd is useless"
https://ldpreload.com/blog/signalfd-is-useless

"Why Bash is like that: Signal propagation" (Ctrl-C sends SIGINT to entire
process group, not just the parent process)
http://www.vidarholen.net/contents/blog/?p=34

"Should you be scared of Unix signals?"
http://jvns.ca/blog/2016/06/13/should-you-be-scared-of-signals/