merge revision(s) 33468:
* ext/pty/pty.c (pty_check): should return nil until the child terminates or stops. [ruby-dev:44600] [Bug #2642]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34183 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 33468:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34183 b2dd03c8-39d4-4d8f-98ff-823fe69b080e