From dcf5aa013861081fcc71ce56304631ea0b9eb065 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Mon, 13 Oct 2003 21:08:50 +0000
Subject: [PATCH] Use the one remaining free termios control character slot for
 a tty checkpoint capability, which defaults to ^E and sends the SIGCKPT
 signal.

---
 sys/emulation/ibcs2/i386/ibcs2_ioctl.c | 3 ++-
 sys/kern/tty.c                         | 7 ++++++-
 sys/sys/termios.h                      | 5 ++---
 sys/sys/ttydefaults.h                  | 3 ++-
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/sys/emulation/ibcs2/i386/ibcs2_ioctl.c b/sys/emulation/ibcs2/i386/ibcs2_ioctl.c
index d3ade26904..62376f3952 100644
--- a/sys/emulation/ibcs2/i386/ibcs2_ioctl.c
+++ b/sys/emulation/ibcs2/i386/ibcs2_ioctl.c
@@ -26,7 +26,7 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * $FreeBSD: src/sys/i386/ibcs2/ibcs2_ioctl.c,v 1.13.2.1 2001/07/31 20:14:21 jon Exp $
- * $DragonFly: src/sys/emulation/ibcs2/i386/Attic/ibcs2_ioctl.c,v 1.7 2003/08/27 06:30:03 rob Exp $
+ * $DragonFly: src/sys/emulation/ibcs2/i386/Attic/ibcs2_ioctl.c,v 1.8 2003/10/13 21:08:46 dillon Exp $
  */
 
 #include <sys/param.h>
@@ -218,6 +218,7 @@ stios2btios(st, bt)
 	bt->c_cc[VWERASE]  = _POSIX_VDISABLE;
 	bt->c_cc[VLNEXT]   = _POSIX_VDISABLE;
 	bt->c_cc[VSTATUS]  = _POSIX_VDISABLE;
+	bt->c_cc[VCHECKPT]  = _POSIX_VDISABLE;
 }
 
 static void
diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index f61a0807a5..084e14abca 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -37,7 +37,7 @@
  *
  *	@(#)tty.c	8.8 (Berkeley) 1/21/94
  * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
- * $DragonFly: src/sys/kern/tty.c,v 1.7 2003/08/26 21:09:02 rob Exp $
+ * $DragonFly: src/sys/kern/tty.c,v 1.8 2003/10/13 21:08:48 dillon Exp $
  */
 
 /*-
@@ -531,6 +531,11 @@ parmrk:
 				ttyinfo(tp);
 			goto endcase;
 		}
+		if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
+			if (ISSET(lflag, ISIG))
+				pgsignal(tp->t_pgrp, SIGCKPT, 1);
+			goto endcase;
+		}
 	}
 	/*
 	 * Check for input buffer overflow
diff --git a/sys/sys/termios.h b/sys/sys/termios.h
index 538640fa66..30435667a8 100644
--- a/sys/sys/termios.h
+++ b/sys/sys/termios.h
@@ -32,7 +32,7 @@
  *
  *	@(#)termios.h	8.3 (Berkeley) 3/28/94
  * $FreeBSD: src/sys/sys/termios.h,v 1.13.2.1 2001/03/06 06:31:44 jhb Exp $
- * $DragonFly: src/sys/sys/termios.h,v 1.3 2003/08/20 07:31:21 rob Exp $
+ * $DragonFly: src/sys/sys/termios.h,v 1.4 2003/10/13 21:08:50 dillon Exp $
  */
 
 #ifndef _SYS_TERMIOS_H_
@@ -59,7 +59,6 @@
 #define	VREPRINT 	6	/* ICANON together with IEXTEN */
 #define VERASE2 	7	/* ICANON */
 #endif
-/*			7	   ex-spare 1 */
 #define VINTR		8	/* ISIG */
 #define VQUIT		9	/* ISIG */
 #define VSUSP		10	/* ISIG */
@@ -76,7 +75,7 @@
 #define VTIME		17	/* !ICANON */
 #ifndef _POSIX_SOURCE
 #define VSTATUS		18	/* ICANON together with IEXTEN */
-/*			19	   spare 2 */
+#define VCHECKPT	19	/* ICANON together with IEXTEN */
 #endif
 #define	NCCS		20
 
diff --git a/sys/sys/ttydefaults.h b/sys/sys/ttydefaults.h
index 7d16fd9fe9..e14cf772ee 100644
--- a/sys/sys/ttydefaults.h
+++ b/sys/sys/ttydefaults.h
@@ -37,7 +37,7 @@
  *
  *	@(#)ttydefaults.h	8.4 (Berkeley) 1/21/94
  * $FreeBSD: src/sys/sys/ttydefaults.h,v 1.13.2.1 2001/03/06 03:37:08 jkh Exp $
- * $DragonFly: src/sys/sys/ttydefaults.h,v 1.2 2003/06/17 04:28:59 dillon Exp $
+ * $DragonFly: src/sys/sys/ttydefaults.h,v 1.3 2003/10/13 21:08:50 dillon Exp $
  */
 
 /*
@@ -59,6 +59,7 @@
  * Control Character Defaults
  */
 #define CTRL(x)	(x&037)
+#define CCHECKPT	CTRL('e')
 #define	CEOF		CTRL('d')
 #define	CEOL		0xff		/* XXX avoid _POSIX_VDISABLE */
 #define	CERASE		0177
-- 
2.41.0