r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f00000002c0), 0x80a01, 0x0)
r1 = openat$full(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
sendfile(r0, r1, 0x0, 0xaa80)