Hi,

When running "X vt2" while something already runs on vt2 (getty for instance),
X doesn't get keypresses (getty does), which is kind of annoying for merely
killing the server for instance :)

In Xserver/hw/xfree86/os-support/linux/lnx_init.c, there should be some
check like when VTnum != -1 && !ShareVTs:

    struct vt_stat vtstat;
 
    if ((ioctl(fd, VT_GETSTATE, &vtstat) < 0))
	FatalError("failed to query vt %d availability", vtno);
 
    if (vtstat.v_state & (1<<vtno))
	FatalError("/dev/%s: already in use", tty);
 
fd being opened from /dev/tty0.

Only vt 1-15 can be checked this way (because of the size of vtstat.v_state),
but this is safer than nothing.

Regards,
Samuel