Adds a 't' command to the menu of con(1) that sends a ^t^t sequence
to the remote. This makes it easier to type debug sequences to a remote kernel
without affecting your local system.

Reference: /n/sources/patch/con-ctl-t-s
Date: Thu Apr 25 11:02:54 CES 2013
Signed-off-by: nemo@lsub.org

--- /sys/src/cmd/con/con.c	Thu Apr 25 11:01:34 2013
+++ /sys/src/cmd/con/con.c	Thu Apr 25 11:01:31 2013
@@ -302,7 +302,7 @@
 /*
  *  control menu
  */
-#define STDHELP	"\t(b)reak, (q)uit, (i)nterrupt, toggle printing (r)eturns, (.)continue, (!cmd)\n"
+#define STDHELP	"\t(b)reak, (q)uit, (i)nterrupt, toggle printing (r)eturns, (.)continue, (!cmd),  (t)^T^T\n"
 
 int
 menu(int net)
@@ -345,6 +345,12 @@
 			break;
 		case 'r':
 			returns = 1-returns;
+			done = 1;
+			break;
+		case 't':
+			write(net, "", 2);
+			if(buf[1] != '\n' && buf[1] != 0)
+				write(net, buf+1, 1);
 			done = 1;
 			break;
 		default:
--- /sys/man/1/con	Thu Apr 25 11:01:38 2013
+++ /sys/man/1/con	Thu Apr 25 11:01:36 2013
@@ -176,6 +176,18 @@
 .TP
 .B r
 Toggle printing of carriage returns.
+.TP
+.B t
+Send a
+.LR ^T^T
+sequence to the network connection. To use
+.IR cons (3)
+debugging requests on the remote system. If a char is
+typed after the
+.LR t
+it is sent after the
+.LR ^T^T
+sequence.
 .PD
 .PP
 .I Telnet