Work around OSX strangneness with recvfrom on connection-oriented sockets

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Wed Jun 23 22:19:10 2004  Dave Thomas  <dave@pragprog.com>
+
+	* ext/socket/socket.c (sock_s_gethostbyaddr): Work around problem
+	  with OS X not returning 'from' parameter to recvfrom for
+	  connection-oriented sockets.
+
 Wed Jun 23 22:16:16 2004  Michal Rokos  <michal@ruby-lang.org>
 
 	* io.c: io_seek()'s retval should be checked [ruby-core:03045]

ext/socket/socket.c

@@ -492,7 +492,11 @@ s_recvfrom(sock, argc, argv, from)
 	    rb_raise(rb_eTypeError, "sockaddr size differs - should not happen");
 	}
 #endif
+	if (alen) /* OSX doesn't return a from result for connection-oriented sockets */
 	  return rb_assoc_new(str, ipaddr((struct sockaddr*)buf, fptr->mode & FMODE_NOREVLOOKUP));
+	else
+	  return rb_assoc_new(str, Qnil);
+
 #ifdef HAVE_SYS_UN_H
       case RECV_UNIX:
 	return rb_assoc_new(str, unixaddr((struct sockaddr_un*)buf));