r0 = openat$tun(0xffffffffffffff9c, &(0x7f0000000000), 0x142, 0x0)
pwritev2(r0, &(0x7f00000000c0)=[{&(0x7f0000000780)="ca", 0x1}], 0x1, 0x0, 0x0, 0x0)