https://git.ruby-lang.org/ruby.git/commit/?id=81eb2d16ef

From 81eb2d16efcb29899e88e30a25ca5440195e2393 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 13 Dec 2019 11:41:31 +0900
Subject: [ruby/io-console] Disable implementation-defined special control
 characters

In raw mode with interrupt enabled.

https://github.com/ruby/io-console/commit/e9e8e3ff17

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 546f962..ec70bdf 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -187,7 +187,7 @@ set_rawmode(conmode *t, void *arg) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L187
 #ifdef ISIG
 	if (r->intr) {
 	    t->c_iflag |= BRKINT|IXON;
-	    t->c_lflag |= ISIG|IEXTEN;
+	    t->c_lflag |= ISIG;
 	}
 #endif
 	(void)r;
diff --git a/test/io/console/test_io_console.rb b/test/io/console/test_io_console.rb
index eab0fb6..765385d 100644
--- a/test/io/console/test_io_console.rb
+++ b/test/io/console/test_io_console.rb
@@ -352,6 +352,16 @@ defined?(PTY) and defined?(IO.console) and TestIO_Console.class_eval do https://github.com/ruby/ruby/blob/trunk/test/io/console/test_io_console.rb#L352
         assert_ctrl("#{cc.ord}", cc, r, w)
         assert_ctrl("Interrupt", cc, r, w)
       end
+      if cc = ctrl["dsusp"]
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+      end
+      if cc = ctrl["lnext"]
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+      end
     end
   end
 
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