r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000140), 0x0, 0x0)
r1 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000140), 0x0, 0x0)
r2 = dup3(r1, r0, 0x0)
ioctl$TCFLSH(r2, 0x5428, 0x0)