* io.c (copy_stream_fallback_body): check nil for EOF of read method.

  patch by Eric Wong.  [ruby-core:39134] [Bug #5237]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33515 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index e3bbd245ed..c2eecb7397 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -826,6 +826,28 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  class Bug5237
+    attr_reader :count
+    def initialize
+      @count = 0
+    end
+
+    def read(bytes, buffer)
+      @count += 1
+      buffer.replace "this is a test"
+      nil
+    end
+  end
+
+  def test_copy_stream_broken_src_read_eof
+    src = Bug5237.new
+    dst = StringIO.new
+    assert_equal 0, src.count
+    th = Thread.new { IO.copy_stream(src, dst) }
+    flunk("timeout") unless th.join(10)
+    assert_equal 1, src.count
+  end
+
   def test_copy_stream_dst_rbuf
     mkcdtmpdir {
       pipe(proc do |w|