Add spec that write on a closed pipe raises Errno::EPIPE
Add spec that write on a closed pipe raises Errno::EPIPE

* And not die from SIGPIPE.

nobu/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,ruby/spec,ruby/rubyspec,eregon/rubyspec,ruby/rubyspec