Issue #7220 has been updated by brixen (Brian Ford). There's also a dup2() system call. Why don't we provide that one as well? ---------------------------------------- Bug #7220: StringIO#initialize_copy causes aliasing between the objects https://bugs.ruby-lang.org/issues/7220#change-31686 Author: brixen (Brian Ford) Status: Open Priority: Normal Assignee: Category: Target version: ruby -v: ruby 1.9.3p286 (2012-10-12 revision 37165) [x86_64-darwin10.8.0] Calling StringIO#initialize_copy causes the two objects to share the position, and eof status. Is this a bug? sasha:rubinius brian$ irb 1.9.3p286 :001 > require 'stringio' => true 1.9.3p286 :002 > a = StringIO.new "abcdefuq" => #<StringIO:0x00000101016a88> 1.9.3p286 :003 > b = StringIO.new => #<StringIO:0x00000101010728> 1.9.3p286 :004 > b.send :initialize_copy, a => #<StringIO:0x00000101010728> 1.9.3p286 :005 > a.pos => 0 1.9.3p286 :006 > b.pos => 0 1.9.3p286 :007 > b.getc => "a" 1.9.3p286 :008 > a.pos => 1 1.9.3p286 :009 > a.getc => "b" 1.9.3p286 :010 > b.pos => 2 1.9.3p286 :011 > b.read => "cdefuq" 1.9.3p286 :012 > a.eof? => true Thanks, Brian -- http://bugs.ruby-lang.org/