what is /dev/vc ?
在Document/filesystems/proc.txt中:   To see  which  tty's  are  currently in use, you can simply look into the file /proc/tty/drivers: 在我的机器上:   $cat /proc/tty/drivers /dev/tty             /dev/tty        5       0 system:/dev/tty /dev/console         /dev/console    5       1 system:console /dev/ptmx            /dev/ptmx       5       2 system /dev/vc/0            /dev/vc/0       4       0 system:vtmaster   rfcomm               /dev/rfcomm   216 0-255 serial ttyprintk            /dev/ttyprintk   5       3 console serial               /dev/ttyS       4 64-111 serial pty_slave       ...