[LTP] semctl01: fix SEM_STAT failures under parallel LTP runs

[linuxtestproject.agent@gmail.com]

Hi Stephen,

On Thu, 30 Jul 2026, Stephen Bertram wrote:
> semctl01: fix SEM_STAT failures under parallel LTP runs

> The per-index lookup duplicated shmctl01's get_shm_idx_from_id(). Move
> the common loop into a new get_ipc_idx_from_id() helper in libs/newipc,
> shared by semctl01.c and shmctl01.c behind a small per-family stat()
> wrapper on each side.

This patch does two things at once: it fixes the SEM_STAT index lookup in
semctl01, and it refactors the already-working shmctl01 to route through a
new shared libnewipc helper.

Would it be cleaner to split this into two patches, so each is one logical
change and bisects independently?

  1) introduce get_ipc_idx_from_id() in libs/newipc and convert shmctl01
     to use it (no behavior change);
  2) fix semctl01's SEM_STAT lookup on top of the new helper.

The semctl01 fix itself, the func_iinfo()/func_sstat() reworks, the
Makefile -lltpnewipc addition, and the kernel-doc on the new helper all
look correct.

Verdict - Needs revision

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