r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
ioctl$TIOCSPTLCK(r0, 0x5420, &(0x7f00000000c0)=0x1)
poll(&(0x7f0000001740)=[{r0}], 0x1, 0x0)