patch 1of2 to prevent kill -1 syslogd from hanging the console

blindly applied patch provided by Christoph Robitschko:
*** cons.c.orig	Sat Jun 12 07:57:53 1993
--- cons.c	Thu Aug 19 22:34:53 1993
***************
*** 56,61 ****
--- 56,62 ----
  #include "sys/tty.h"
  #include "sys/file.h"
  #include "sys/conf.h"
+ #include "sys/vnode.h"

  #include "cons.h"

***************
*** 105,118 ****
--- 106,130 ----
  	(*cp->cn_init)(cp);
  }

+ static struct vnode	*cnopenvp = NULLVP;
+
+
  cnopen(dev, flag, mode, p)
  	dev_t dev;
  	int flag, mode;
  	struct proc *p;
  {
+ 	int		error;
+
+
  	if (cn_tab == NULL)
  		return (0);
  	dev = cn_tab->cn_dev;
+ 	if (cnopenvp == NULLVP)
+ 		if ((error = getdevvp(dev, &cnopenvp, VCHR))) {
+ 			printf("cnopen: getdevvp returned %d !\n", error);
+ 			return(error);
+ 		}
  	return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
  }

***************
*** 121,130 ****
  	int flag, mode;
  	struct proc *p;
  {
  	if (cn_tab == NULL)
  		return (0);
  	dev = cn_tab->cn_dev;
! 	return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
  }

  cnread(dev, uio, flag)
--- 133,153 ----
  	int flag, mode;
  	struct proc *p;
  {
+ 	int		error;
+
+
  	if (cn_tab == NULL)
  		return (0);
  	dev = cn_tab->cn_dev;
! 	if (vcount(cnopenvp) <= 1)
! 		error = (*cdevsw[major(dev)].d_close)(dev, flag, mode, p);
! 	else
! 		error = 0;
! 	if (error == 0) {
! 		vrele(cnopenvp);
! 		cnopenvp = NULLVP;
! 	return(error);
! 	}
  }

  cnread(dev, uio, flag)

1 files changed, 24 insertions, 1 deletions

diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c
index 6189d72..a0e92f1 100644
--- a/sys/kern/tty_cons.c
+++ b/sys/kern/tty_cons.c
@@ -56,6 +56,7 @@
 #include "sys/tty.h"
 #include "sys/file.h"
 #include "sys/conf.h"
+#include "sys/vnode.h"
 
 #include "cons.h"
 
@@ -105,14 +106,25 @@ cninit()
 	(*cp->cn_init)(cp);
 }
 
+static struct vnode	*cnopenvp = NULLVP;
+
+
 cnopen(dev, flag, mode, p)
 	dev_t dev;
 	int flag, mode;
 	struct proc *p;
 {
+	int		error;
+
+
 	if (cn_tab == NULL)
 		return (0);
 	dev = cn_tab->cn_dev;
+	if (cnopenvp == NULLVP)
+		if ((error = getdevvp(dev, &cnopenvp, VCHR))) {
+			printf("cnopen: getdevvp returned %d !\n", error);
+			return(error);
+		}
 	return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
 }
  
@@ -121,10 +133,21 @@ cnclose(dev, flag, mode, p)
 	int flag, mode;
 	struct proc *p;
 {
+	int		error;
+
+
 	if (cn_tab == NULL)
 		return (0);
 	dev = cn_tab->cn_dev;
-	return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
+	if (vcount(cnopenvp) <= 1)
+		error = (*cdevsw[major(dev)].d_close)(dev, flag, mode, p);
+	else
+		error = 0;
+	if (error == 0) {
+		vrele(cnopenvp);
+		cnopenvp = NULLVP;
+	return(error);
+	}
 }
  
 cnread(dev, uio, flag)