Add the remainder of POSIX signals (plus WINCH and IO) #11
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I just now noticed that this slightly conflicts with @l0kod's #10; they should merge pretty smoothly though.
Tests pass on my Linux box.
I made these patches in my own time and submit them under the existing LICENSE terms for this repo.
I did a quick check against OS X and OpenBSD. SIGPOLL is supposed to be part of
POSIX.1-2008, with the note that it might be removed in the future, and isn't
in either of those OSes, so removed that. SIGWINCH and SIGIO seem pretty
popular, so did include those (they are in the rust libc crate).
Refs:
http:https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html
http:https://man.openbsd.org/sigaction.2
https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man3/signal.3.html