r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
ioctl$TIOCSPTLCK(r0, 0x40045431, &(0x7f0000000000))
r1 = ioctl$TIOCGPTPEER(r0, 0x5441, 0x0)
dup3(r0, r1, 0x0)
readv(r1, &(0x7f0000000340)=[{&(0x7f0000000100)=""/53, 0x35}], 0x1)