[LTP] close02: add test for double close EBADF

[linuxtestproject.agent@gmail.com]

Hi Jinseok,

On 2026-05-13, Jinseok Kim wrote:
> close02: add test for double close EBADF

> +static void setup(void)
> +{
> +       fd_closed = SAFE_OPEN("close02", O_CREAT | O_RDWR, 0600);
> +       if (close(fd_closed) == -1)
> +               tst_brk(TBROK | TERRNO, "close(%d) failed", fd_closed);
> +}

Use SAFE_CLOSE instead of a raw close(). Since SAFE_CLOSE sets the variable
to -1, save the fd value first:

    int tmp_fd;
    fd_closed = SAFE_OPEN("close02", O_CREAT | O_RDWR, 0600);
    tmp_fd = fd_closed;
    SAFE_CLOSE(tmp_fd);

---
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