hsbt	2017-08-22 15:40:59 +0900 (Tue, 22 Aug 2017)

  New Revision: 59642

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59642

  Log:
    Gracefully handle CSV IO when file descriptor closed.
    
      [Bug #10504][ruby-core:66240]

  Modified files:
    trunk/lib/csv.rb
    trunk/test/csv/test_interface.rb
Index: test/csv/test_interface.rb
===================================================================
--- test/csv/test_interface.rb	(revision 59641)
+++ test/csv/test_interface.rb	(revision 59642)
@@ -137,6 +137,14 @@ class TestCSV::Interface < TestCSV https://github.com/ruby/ruby/blob/trunk/test/csv/test_interface.rb#L137
     end
   end
 
+  def test_open_handles_prematurely_closed_file_descriptor_gracefully
+    assert_nothing_raised(Exception) do
+      CSV.open(@path) do |csv|
+        csv.close
+      end
+    end
+  end
+
   ### Test Write Interface ###
 
   def test_generate
Index: lib/csv.rb
===================================================================
--- lib/csv.rb	(revision 59641)
+++ lib/csv.rb	(revision 59642)
@@ -1291,7 +1291,7 @@ class CSV https://github.com/ruby/ruby/blob/trunk/lib/csv.rb#L1291
       begin
         yield csv
       ensure
-        csv.close
+        csv.closed? || csv.close
       end
     else
       csv

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