To lock VT switching, try the following simple code.
This is nice because root can re-enable switching to
get a terminal if needed.
Compile the code below.
Run it in the first console with: vtlock lock /dev/tty
Next, enter startx -- vt1
You now have X on vt1, non-switchable.
For X on the usual vt7, lock it with: vtlock lock /dev/tty7
/* vtlock.c -- A simple virtual termnial [un]locker */
#include <linux/vt.h>
#include <fcntl.h>
#include <stdio.h>
int main(int argc, char *argv[]){
int fd,lock;
if (argc<2){
fprintf(stderr,"Usage: %s lock|unlock <tty device>\n"
"\tlock or unlock the given tty.\n",
argv[0]);
exit(-1);
}
if (!(fd=open(argv[2],O_RDONLY))) {
fprintf(stderr,"Error: unable to open tty %s\n",argv[2]);
exit(-1);
}
lock=!strcmp(argv[1],"lock");
printf("Ioctl VT_%sLOCKSWITCH returned %d\n",lock?"":"UN",
ioctl(fd,lock?VT_LOCKSWITCH:VT_UNLOCKSWITCH));
return(0);
}
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