merge revision(s) 56416: [Backport #12836]

	* io.c (copy_stream_body): use IO to write to copy to duplex IO.
	  http://twitter.com/knu/status/786505317974585344


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56569 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 2b79acea09..c3cf34b799 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1090,6 +1090,18 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def test_copy_stream_to_duplex_io
+    result = IO.pipe {|a,w|
+      Thread.start {w.puts "yes"; w.close}
+      IO.popen([EnvUtil.rubybin, '-pe$_="#$.:#$_"'], "r+") {|b|
+        IO.copy_stream(a, b)
+        b.close_write
+        b.read
+      }
+    }
+    assert_equal("1:yes\n", result)
+  end
+
   def ruby(*args)
     args = ['-e', '$>.write($<.read)'] if args.empty?
     ruby = EnvUtil.rubybin