Don't send INT signal itself.

On make test-all, it kills the process.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37736 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_signal.rb

@@ -243,19 +243,21 @@ EOS
   def test_signame
     return unless Process.respond_to?(:kill)
 
-    begin
-      10.times do
-        caught = 0
-        signame = "wrong"
-
-        Signal.trap("INT") { |signo| signame = Signal.signame(signo); caught = 1;  }
-        Process.kill("INT", 0)
-
-        sleep 0.01 while caught==0
+    10.times do
+      IO.popen([EnvUtil.rubybin, "-e", <<EOS, :err => File::NULL]) do |child|
+        Signal.trap("INT") do |signo|
+          signame = Signal.signame(signo)
+          Marshal.dump(signame, STDOUT)
+          STDOUT.flush
+          exit 0
+        end
+        sleep
+EOS
+        sleep 0.1
+        Process.kill("INT", child.pid)
+        signame = Marshal.load(child)
         assert_equal(signame, "INT")
       end
-    ensure
-      Signal.trap("INT", "DEFAULT")
     end
   end
 end