syscall.Dup2 is unsupported

[liavOpti]

Hey!

I noticed that in the file gopjrt/pjrt/dynamiclib.go, the dup2 syscall is being used. Unfortunately, my system (Ubuntu 24.04.1 LTS, arm64 architecture) does not support dup2, and this is causing issues.

Could you please update the code to use dup3 instead? Alternatively, using close() followed by dup() would also work as a solution.

Let me know if you need further details or assistance with this!

Thanks!

[janpfeifer]

Thanks for reporting @liavOpti , this seems a simple enough fix. Let me check it.

[janpfeifer]

I used dup3 just in the very odd case someone closed fd 0 or 1, in which case close+dup would duplicate to the wrong fd number -- I assume it picks up the first one free.

Btw, just below I use syscall.Dup, that is available in Arm64, right ?

Pls, let me know if it works. With so many offerings with Arm64 these days (even Nvidia is launching a AI Desktop arm64 based) it would be very neat to add support for it.

[janpfeifer]

It should be in head in main branch. Let me know if you need an immediate release, or if you can work with head from github. I usually wait for more changes before cutting a release, but if you need it, I'll make it.