[LTP] OpenPOSIX: Return PTS_UNTESTED when detaching or joining joined thread returns 0

[linuxtestproject.agent@gmail.com]

Hi Wei,

On 2026-05-21, Wei Gao wrote:
> OpenPOSIX: Return PTS_UNTESTED when detaching or joining joined thread returns 0

> +       if (ret == 0) {
> +               printf("Test UNTESTED: Implementation does not return ESRCH\n");
> +               return PTS_UNTESTED;
> +       }

Correct approach — returning PTS_UNTESTED is more semantically accurate than
accepting 0 as a passing result when ESRCH is the expected optional behavior.

Reviewed-by: LTP AI Reviewer <ltp-ai@noreply.github.com>

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