@RichFelker Would you have any interest in this API being prototyped in musl libc? https://www.facebook.com/notes/daniel-colascione/toward-shareable-posix-signals/10157129032641102 …
glibc is a lot more receptive than they used to be; I'd post something to libc-alpha. Ping me when you do if you'd like me to reply on it. Hopefully some BSD folks will see these tweets too and have some idea if any BSDs are interested in discussing it.