[LTP] hugetlb/hugeshmget: Add hugeshmget07 to test SHM_HUGETLB with /dev/zero read

[linuxtestproject.agent@gmail.com]

Hi Pavithra,

On Wed, 23 Sep 2026 14:03:00 +0530, Pavithra <pavrampu@linux.ibm.com> wrote:
> hugetlb/hugeshmget: Add hugeshmget07 to test SHM_HUGETLB with /dev/zero read

>+	zero_fd = SAFE_OPEN("/dev/zero", O_RDONLY);
>+
>+	shmid = SAFE_SHMGET(IPC_PRIVATE, size, SHM_HUGETLB | SHM_R | SHM_W);
>+
>+	shmaddr = SAFE_SHMAT(shmid, 0, SHM_RND);
>+	tst_res(TINFO, "shmaddr: %p", shmaddr);
>+
>+	for (i = 0; i < size; i += hpage_size) {
>+		TST_EXP_VAL(read(zero_fd, shmaddr + i, hpage_size),
>+			(ssize_t)hpage_size);
>+	}
>+
>+	SAFE_CLOSE(zero_fd);

File descriptors must be initialized to -1 and closed in cleanup() with an
fd != -1 guard. If SAFE_SHMGET() or SAFE_SHMAT() aborts, zero_fd is not
closed. Define static int zero_fd = -1 at file scope, open it in setup(),
and close it in cleanup().

>+	SAFE_SHMCTL(shmid, IPC_RMID, NULL);
>+	shmid = -1;

SAFE_SHMCTL() sets shmid to -1 when called with IPC_RMID. The subsequent
shmid = -1 assignment is redundant.

Verdict - Needs revision

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