r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000140)='/proc/tty/ldiscs\x00', 0x0, 0x0)
preadv(r0, &(0x7f00000000c0)=[{&(0x7f0000000000)=""/35, 0x23}], 0x1, 0x6, 0x0)