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Subject[PATCH] Restrict VT-Switching per VT
Linus,

this patch on 2.4.4 adds the ability to turn VT-switching
on and off for each (existing) VT via ioctl().

It works exactly like the existing code by blocking
VT-switching to the blocked terminals.

It is a very nice feature to 'hide' VT's of users
allowing others to work with other VT's on the same
machine.

I am not on the kernel list. Pleas CC me followups
to war@tcp-ip.at

BTW: Thank you all for your work.

Thomas

diff -urN -X dontdiff linux-2.4.4.ori/include/linux/vt.h linux/include/linux/vt.h
--- linux-2.4.4.ori/include/linux/vt.h Sat May 5 20:46:51 2001
+++ linux/include/linux/vt.h Sat May 5 21:33:26 2001
@@ -50,5 +50,7 @@
#define VT_RESIZEX 0x560A /* set kernel's idea of screensize + more */
#define VT_LOCKSWITCH 0x560B /* disallow vt switching */
#define VT_UNLOCKSWITCH 0x560C /* allow vt switching */
+#define VT_LOCKSWITCHTO 0x560D /* disallow vt switching to a vt*/
+#define VT_UNLOCKSWITCHTO 0x560E /* allow vt switching to a vt*/

#endif /* _LINUX_VT_H */
diff -urN -X dontdiff linux-2.4.4.ori/drivers/char/vt.c linux/drivers/char/vt.c
--- linux-2.4.4.ori/drivers/char/vt.c Fri Feb 9 20:30:22 2001
+++ linux/drivers/char/vt.c Sat May 5 21:33:44 2001
@@ -7,6 +7,7 @@
* Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
* Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
* Some code moved for less code duplication - Andi Kleen - Mar 1997
+ * Restrict VT switching per VT - Thomas Warwaris - May 2001
*/

#include <linux/config.h>
@@ -41,6 +42,7 @@
#endif /* CONFIG_FB_COMPAT_XPMAC */

char vt_dont_switch;
+char vt_dont_switch_to [MAX_NR_CONSOLES];
extern struct tty_driver console_driver;

#define VT_IS_IN_USE(i) (console_driver.table[i] && console_driver.table[i]->count)
@@ -1047,6 +1049,16 @@
return -EPERM;
vt_dont_switch = 0;
return 0;
+ case VT_LOCKSWITCHTO:
+ if (!suser())
+ return -EPERM;
+ vt_dont_switch_to[arg-1] = 1;
+ return 0;
+ case VT_UNLOCKSWITCHTO:
+ if (!suser())
+ return -EPERM;
+ vt_dont_switch_to[arg-1] = 0;
+ return 0;
#ifdef CONFIG_FB_COMPAT_XPMAC
case VC_GETMODE:
{
@@ -1243,6 +1255,8 @@
void change_console(unsigned int new_console)
{
if ((new_console == fg_console) || (vt_dont_switch))
+ return;
+ if ( vt_dont_switch_to[new_console] )
return;
if (!vc_cons_allocated(new_console))
return;
-
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