No, they are invalid because you don't have a stdout and stderr.
open() doesn't work the way you seem to think here.
>
> open("/dev/tty", O_RDWR) = -1 ENXIO (No such device or address)
>
ENXIO on /dev/tty means you don't have a current tty. From the trace
I suspect you have your /dev/ptyp*'s set up properly but your
/dev/ttyp*'s are broken.
-hpa
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