Socket.sockaddr_in doesn't seem to work with integers.

[tenderlove]

This code works on CRuby but not TruffleRuby:

$ ruby -v -rsocket -e'p Socket.sockaddr_in(0, Socket::INADDR_ANY)'
ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.arm64e-darwin23]
"\x10\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

$ ruby -v -rsocket -e'p Socket.sockaddr_in(0, Socket::INADDR_ANY)'
truffleruby 23.1.1, like ruby 3.2.2, Oracle GraalVM Native [aarch64-darwin]
/Users/aaron/.rubies/arm64/truffleruby-23.1.1/lib/truffle/socket/truffle/foreign.rb:280:in `pack_sockaddr_in': undefined method `empty?' for 0:Integer (NoMethodError)
	from /Users/aaron/.rubies/arm64/truffleruby-23.1.1/lib/truffle/socket/socket.rb:237:in `pack_sockaddr_in'
	from -e:1:in `<main>'

I haven't tried investigating the problem yet, just wanted to file the issue so it doesn't get lost. Thanks!

[mtortonesi]

Could probably be fixed by something like this?

diff --git a/lib/truffle/socket/truffle/foreign.rb b/lib/truffle/socket/truffle/foreign.rb
index 9ea5838d68..d97b890831 100644
--- a/lib/truffle/socket/truffle/foreign.rb
+++ b/lib/truffle/socket/truffle/foreign.rb
@@ -277,7 +277,7 @@ module Truffle
         hints[:ai_socktype] = type
         hints[:ai_flags]    = flags
 
-        if host and host.empty?
+        if host == Socket::INADDR_ANY || (host and host.empty?)
           host = '0.0.0.0'
         end