1 files changed, 32 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index de78b71c6a..0a100b1457 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -78,6 +78,14 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def trapping_usr1
+    @usr1_rcvd  = 0
+    trap(:USR1) { @usr1_rcvd += 1 }
+    yield
+    ensure
+      trap(:USR1, "DEFAULT")
+  end
+
   def test_pipe
     r, w = IO.pipe
     assert_instance_of(IO, r)
@@ -594,6 +602,30 @@ class TestIO < Test::Unit::TestCase
           result = t.value
           assert_equal(megacontent, result)
         }
+        with_socketpair {|s1, s2|
+          begin
+            s1.nonblock = true
+          rescue Errno::EBADF
+            skip "nonblocking IO for pipe is not implemented"
+          end
+          trapping_usr1 do
+            nr = 10
+            pid = fork do
+              s1.close
+              IO.select([s2])
+              Process.kill(:USR1, Process.ppid)
+              s2.read
+            end
+            s2.close
+            nr.times do
+              assert_equal megacontent.bytesize, IO.copy_stream("megasrc", s1)
+            end
+            assert_equal(1, @usr1_rcvd)
+            s1.close
+            _, status = Process.waitpid2(pid)
+            assert status.success?, status.inspect
+          end
+        }
       end
     }
   end