r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
ioctl$TIOCSPTLCK(r0, 0x5420, &(0x7f0000000040)=0x1)
readv(r0, &(0x7f0000002a00)=[{&(0x7f00000025c0)=""/136, 0x88}], 0x1)