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"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/
"Reap zombie processes using a SIGCHLD handler"
http://www.microhowto.info/howto/reap_zombie_processes_using_a_sigchld_handler.html
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