[LTP] pthread_detach_1-2: Fix failure on modern glibc

[linuxtestproject.agent@gmail.com]

Hi Wei,

On Sat, 9 May 2026, Wei Gao wrote:
> pthread_detach_1-2: Fix failure on modern glibc

> +	/* Wait for the main thread to allow exit */
> +	do {
> +		ret = sem_wait(&sem_exit);
> +	}
> +	while ((ret == -1) && (errno == EINTR));
> +	if (ret == -1) {
> +		UNRESOLVED(errno, "Failed to wait for the exit semaphore");
> +	}

[...]

> +	ret = sem_init(&sem_exit, 0, 0);
> +	if (ret != 0) {
> +		UNRESOLVED(errno, "Failed to init the exit semaphore");
> +	}

[...]

> +	sem_destroy(&sem_exit);

Fix looks correct. The extra semaphore ensures the child stays alive past
the pthread_join() probe, so glibc reliably sees THREAD_STATE_DETACHED
and returns EINVAL rather than ESRCH.

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

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- 1-2.c:5 — testfrmw.h used instead of posixtest.h; entry point is
  test_main() rather than main() — established convention for this
  test framework subdirectory.
- 1-2.c:178 — break inside #if VERBOSE > 0 causes case 1 fall-through
  when VERBOSE=0; harmless because case 2/default are also gated by the
  same #ifdef.

---
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