Properly handle argument Socket::INADDR_ANY in Socket.sockaddr_in.

This should fix issue 3361.

Author: mtortonesi

CHANGELOG.md

@@ -21,6 +21,7 @@ Compatibility:
 * Promote `File#path` and `File#to_path` to `IO#path` and `IO#to_path` and make IO#new accept an optional `path:` keyword argument (#3039, @moste00)
 * Display "unhandled exception" as the message for `RuntimeError` instances with an empty message (#3255, @nirvdrum).
 * Set `RbConfig::CONFIG['configure_args']` for openssl and libyaml (#3170, #3303, @eregon).
+* Support `Socket.sockaddr_in(port, Socket::INADDR_ANY)` (#3361, @mtortonesi).
 
 Performance:
 

lib/truffle/socket/truffle/foreign.rb

@@ -277,7 +277,7 @@ def self.pack_sockaddr_in(host, port, family = ::Socket::AF_UNSPEC,
         hints[:ai_socktype] = type
         hints[:ai_flags]    = flags
 
-        if host and host.empty?
+        if host == ::Socket::INADDR_ANY or (host and host.empty?)
           host = '0.0.0.0'
         end
 

spec/ruby/library/socket/shared/pack_sockaddr.rb

@@ -17,6 +17,9 @@
 
     sockaddr_in = Socket.public_send(@method, nil, '127.0.0.1')
     Socket.unpack_sockaddr_in(sockaddr_in).should == [0, '127.0.0.1']
+
+    sockaddr_in = Socket.public_send(@method, 80, Socket::INADDR_ANY)
+    Socket.unpack_sockaddr_in(sockaddr_in).should == [80, '0.0.0.0']
   end
 
   platform_is_not :solaris do