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kbdfs: allow to escape ctlr-alt-del with shift for vmx and vnc.

--- a/sys/man/8/kbdfs

+++ b/sys/man/8/kbdfs

@@ -179,6 +179,32 @@

 .B $console

 environment variable is set. (see

 .IR plan9.ini (8)).

+.PP

+Holding

+.LR Ctrl

++

+.LR Alt

+and then pressing the

+.LR Del

+key will

+trigger a reboot of the terminal.

+To forward this sequence downstream,

+.LR Shift

++

+.LR Ctrl

++

+.LR Alt

+and then pressing

+.LR Del

+will cause to send a

+.LR Shift

+up before the

+.LR Del

+key.

+This is usefull for programs like

+.IR vnc (1)

+and

+.IR vmx (1).

 .SS Keyboard

 A read on the

 .BR kbd

--- a/sys/src/cmd/aux/kbdfs/kbdfs.c

+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c

@@ -371,6 +371,13 @@

 	threadexitsall(nil);

 }

+void

+shiftup(void)

+{

+	Key key = { .down = 0, .r = Kshift, .b = Kshift };

+	send(keychan, &key);

+}

+

 /*

  * Scan code processing

  */

@@ -433,8 +440,12 @@

 	if(scan->caps && key.r<='z' && key.r>='a')

 		key.r += 'A' - 'a';

-	if(scan->ctl && scan->alt && key.r == Kdel)

-		reboot();

+	if(scan->ctl && scan->alt && key.r == Kdel){

+		if(scan->shift)

+			shiftup();

+		else

+			reboot();

+	}

 	if(key.b)

 		send(keychan, &key);