Try in system console this command : ls /dev/tty*
Here is output from my system :
crw-rw-rw- 1 root tty 5, 0 06-01 22:06 /dev/tty
crw--w---- 1 root tty 4, 0 06-01 22:06 /dev/tty0
crw------- 1 root root 4, 1 06-01 22:08 /dev/tty1
crw--w---- 1 root tty 4, 10 06-01 22:06 /dev/tty10
crw--w---- 1 root tty 4, 11 06-01 22:06 /dev/tty11
crw--w---- 1 root tty 4, 12 06-01 22:06 /dev/tty12
crw-rw-rw- 1 root tty 5, 0 06-01 22:06 /dev/tty
crw--w---- 1 root tty 4, 0 06-01 22:06 /dev/tty0
crw------- 1 root root 4, 1 06-01 22:08 /dev/tty1
crw--w---- 1 root tty 4, 10 06-01 22:06 /dev/tty10
crw--w---- 1 root tty 4, 11 06-01 22:06 /dev/tty11
crw--w---- 1 root tty 4, 12 06-01 22:06 /dev/tty12
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As You see only root and tty group have permision to use tty devices.
A problem with system configuration not with application.
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