vlock-lockswitch.c

   1 /* vlock-lockswitch.c -- console switch locking routine for vlock,
   2  *                       the VT locking program for linux
   3  *
   4  * This program is copyright (C) 2007 Frank Benkstein, and is free
   5  * software which is freely distributable under the terms of the
   6  * GNU General Public License version 2, included as the file COPYING in this
   7  * distribution.  It is NOT public domain software, and any
   8  * redistribution not permitted by the GNU General Public License is
   9  * expressly forbidden without prior written permission from
  10  * the author.
  11  *
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/vt.h>
  21
  22 #define CONSOLE "/dev/tty0"
  23
  24 int main(void) {
  25   int consfd;
  26
  27   if ((consfd = open(CONSOLE, O_RDWR)) < 0) {
  28     perror("vlock: cannot open virtual console");
  29     exit (1);
  30   }
  31
  32   /* globally disable virtual console switching */
  33   if (ioctl(consfd, VT_LOCKSWITCH) < 0) {
  34     perror("vlock-lockswitch: could not disable console switching");
  35     exit (1);
  36   }
  37
  38   return 0;
  39 }