r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/tty/ldiscs\x00', 0x0, 0x0)
r1 = socket$netlink(0x10, 0x3, 0x0)
sendfile(r1, r0, &(0x7f00000000c0)=0x7, 0x8001)