the interface ws0 isn't generated at all

[luckypoem]

hi.
i ran ./vpn-ws --tuntap ws0 /run/vpn.sock > /dev/null & in ~/vpn-ws/,
[root@host vpn-ws]# ps aux|grep vpn-ws
root 7935 0.0 0.0 4384 1364 pts/0 S 15:10 0:00 ./vpn-ws --tuntap ws0 /run/vpn.sock
root 7945 0.0 0.1 112716 2380 pts/0 S+ 15:16 0:00 grep --color=auto vpn-ws
[root@host vpn-ws]#
but the interface ws0 isn't generated at all,as i ran ifconfig,i didn't see the interface ws0 shown:

[root@host vpn-ws]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet my-vps-ip netmask 255.255.240.0 broadcast 174.137.63.255
inet6 fe80::a8aa:ff:fe12:2e1c prefixlen 64 scopeid 0x20
ether aa:aa:00:12:2e:1c txqueuelen 1000 (Ethernet)
RX packets 815736 bytes 364317320 (347.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 720135 bytes 341692080 (325.8 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1420
inet 19.0.0.1 netmask 255.255.255.0 destination 19.0.0.1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
RX packets 177173 bytes 33083912 (31.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 192633 bytes 158337140 (151.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@host vpn-ws]#

why the interface ws0 isn't generated at all?