commit c42dec5460fc471946c00a99ea2e04accce9d7c5
Author: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Date:   Thu Nov 8 08:49:16 2012 -0500

    signame
    
    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@gmail.com>

diff --git a/signal.c b/signal.c
index 304b1e4..c9e3387 100644
--- a/signal.c
+++ b/signal.c
@@ -207,6 +207,28 @@ signo2signm(int no)
     return 0;
 }
 
+/*
+ * call-seq:
+ *    Signal.signame(signo)              ->  string
+ *
+ *  convert signal number to signal name
+ *
+ * Signal.trap("INT") { |signo| puts Signal.signame(signo) }
+ * Process.kill("INT", 0)
+ *
+ *  <em>produces:</em>
+ *
+ *     INT
+ */
+static VALUE
+sig_signame(VALUE recv, VALUE signo)
+{
+    char* signame;
+
+    signame = signo2signm(NUM2INT(signo));
+    return rb_str_new_cstr(signame);
+}
+
 const char *
 ruby_signal_name(int no)
 {
@@ -1086,6 +1108,7 @@ Init_signal(void)
     rb_define_global_function("trap", sig_trap, -1);
     rb_define_module_function(mSignal, "trap", sig_trap, -1);
     rb_define_module_function(mSignal, "list", sig_list, 0);
+    rb_define_module_function(mSignal, "signame", sig_signame, 1);
 
     rb_define_method(rb_eSignal, "initialize", esignal_init, -1);
     rb_define_method(rb_eSignal, "signo", esignal_signo, 0);
diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 0e3af06..3d7f64a 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -240,4 +240,16 @@ EOS
     }
   end
 
+  def test_signame
+    10.times do
+      caught = 0
+      signame = "hoge"
+
+      Signal.trap("INT") { |signo| signame = Signal.signame(signo); caught = 1;  }
+      Process.kill("INT", 0)
+
+      sleep 0.01 while caught==0
+      assert_equal(signame, "INT")
+    end
+  end
 end