r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/tty/ldiscs\x00', 0x0, 0x0)
readv(r0, &(0x7f0000000280)=[{&(0x7f00000004c0)=""/4086, 0xff6}], 0x1)