[LTP] power_management: rewrite runpwtests04.sh in C

[linuxtestproject.agent@gmail.com]

Hi Jinseok,

On Mon, May 25, 2026, Jinseok Kim wrote:
> power_management: rewrite runpwtests04.sh in C

> +static void verify_cpuidle(unsigned int i)
> +{
> +	int fd;
> +	char path[PATH_MAX];
> +	char buf[32];
> +
> +	snprintf(path, sizeof(path), "%s/%s", CPUIDLE_PATH, tcases[i].name);
> +
> +	fd = SAFE_OPEN(path, O_RDONLY);
> +
> +	SAFE_READ(0, fd, buf, sizeof(buf));
> +	SAFE_CLOSE(fd);

If SAFE_READ() triggers tst_brk(), execution jumps to cleanup but
there is no cleanup registered, so fd is never closed.

The LTP convention is to track file descriptors in a static variable
initialized to -1 and close them in a .cleanup handler:

  static int fd = -1;

  static void verify_cpuidle(unsigned int i)
  {
          ...
          fd = SAFE_OPEN(path, O_RDONLY);
          SAFE_READ(0, fd, buf, sizeof(buf));
          SAFE_CLOSE(fd);

          tst_res(TPASS, "%s read successfully", path);
  }

  static void cleanup(void)
  {
          if (fd != -1)
                  SAFE_CLOSE(fd);
  }

  static struct tst_test test = {
          .setup = setup,
          .cleanup = cleanup,
          ...
  };

Verdict: Needs revision

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