it is defined. if it is not defined, assume 64 as the max of fds. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31392 b2dd03c8-39d4-4d8f-98ff-823fe69b080e