Hi,

You seems to use Ruby 1.8.x.
So can you try following?

Index: ext/readline/readline.c
===================================================================
--- ext/readline/readline.c     (revision 26664)
+++ ext/readline/readline.c     (working copy)
@@ -833,6 +833,12 @@
 #ifdef HAVE_RL_EVENT_HOOK
     rl_event_hook = readline_event;
 #endif
+#ifdef HAVE_RL_CATCH_SIGNALS
+    rl_catch_signals = 0;
+#endif
+#ifdef HAVE_RL_CATCH_SIGWINCH
+    rl_catch_sigwinch = 0;
+#endif
 #ifdef HAVE_RL_CLEAR_SIGNALS
     rl_clear_signals();
 #endif
Index: ext/readline/extconf.rb
===================================================================
--- ext/readline/extconf.rb     (revision 26664)
+++ ext/readline/extconf.rb     (working copy)
@@ -59,6 +59,9 @@
 have_readline_var("rl_attempted_completion_over")
 have_readline_var("rl_library_version")
 have_readline_var("rl_event_hook")
+# workaround for native windows.
+/mswin|bccwin|mingw/ !~ RUBY_PLATFORM && have_readline_var("rl_catch_sigwinch")
+/mswin|bccwin|mingw/ !~ RUBY_PLATFORM && have_readline_var("rl_catch_signals")
 have_readline_func("rl_cleanup_after_signal")
 have_readline_func("rl_clear_signals")
 have_readline_func("rl_vi_editing_mode")

(2010/02/19 4:59), Andrew Eberbach wrote:
> Hi
> 
> I've been noticing that irb (and as a result script/console in rails)
> don't behave correctly with Control C. Nothing would happen when I hit
> control C until I hit enter or a few more keys and then it would clear
> the line and show a ^C and reset to the prompt. This doesn't happen on
> Linux and it didn't happen on 10.5
> 
> If there's a long running process in irb hitting control c works as
> expected but not if it's just sitting at a prompt.
> 
> I played around with the ext/readline.c and found that if I put a
> 
>  rl_catch_signals = 0;
> 
> (see http://tiswww.case.edu/php/chet/readline/readline.html)
> 
> in Init_readline()
> 
> Then everything works as normal. Should this be added as a patch?
> Reading the readline docs it seems to me that what's happening is the
> internal readline handler gets stuck sending SIGINT back to the ruby
> process even though there's a trap("SIGINT") defined. Any ideas?
> 
> 
> Andrew
> 

-- 
NARUSE, Yui  <naruse / airemix.jp>