* signal.c (sig_signame): implements Signal.signame method

[Feature #5613]
* test/ruby/test_signal.rb (test_signame): adds test for above
* NEWS: add an item about above



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37723 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Tue Nov 20 08:36:15 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* signal.c (sig_signame): implements Signal.signame method
+	[Feature #5613]
+	* test/ruby/test_signal.rb (test_signame): adds test for above
+	* NEWS: add an item about above
+
 Mon Nov 19 16:30:59 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* struct.c (rb_struct_each_pair): yield associated pairs so that

NEWS

@@ -105,6 +105,9 @@ with all sufficient information, see the ChangeLog file.
       * added Range#bsearch for binary search.
 
   * Signal
+    * added method:
+      * added Signal.signame which returns signal name
+
     * incompatible changes:
       * Signal.trap raises ArgumentError when :SEGV, :BUS, :ILL, :FPE, :VTALRM
         are specified.

signal.c

@@ -207,6 +207,26 @@ 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)
+{
+    const char *signame = signo2signm(NUM2INT(signo));
+    return rb_str_new_cstr(signame);
+}
+
 const char *
 ruby_signal_name(int no)
 {
@@ -1086,6 +1106,7 @@ 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);

test/ruby/test_signal.rb

@@ -240,4 +240,22 @@ EOS
     }
   end
 
+  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
+        assert_equal(signame, "INT")
+      end
+    ensure
+      Signal.trap("INT", "DEFAULT")
+    end
+  end
 end