[LTP] syscalls: Add epoll_ctl07

[linuxtestproject.agent@gmail.com]

Hi Cyril,

On Wed, Jul 15, 2026, Cyril Hrubis wrote:
> syscalls: Add epoll_ctl07

--- [PATCH 1/5] ---

> The epoll_ctl05 exercies the loop detector with a longer chain this
> test does the same but only with two epoll fds.

Typo: "exercies" should be "exercises". Also the sentence runs on --
a period or semicolon is needed after "longer chain".

--- [PATCH 2/5] ---

> That checks that subsequent calls to epoll() return all events if there
> were more events than the size of the events array passed to epoll.

The syscall under test is epoll_wait(2), not epoll(). Should read
"subsequent calls to epoll_wait()".

> +static void close_fds(int fds[][2], int n)
> +{
> +	int i;
> +
> +	for (i = 0; i < n; i++) {
> +		if (fds[i][0] > 0) {

The check `> 0` uses 0 as the "not opened" sentinel, but fd 0 is a
valid file descriptor. If SAFE_PIPE() returns fd 0 for fds[i][0]
(which happens when stdin has been closed), both pipe ends would leak.

The convention in this file is already `!= -1` (see epfd). Initialise
the arrays to {-1, -1} and guard with `!= -1`.

--- [PATCH 3/5] ---

> +	for (i = 0; i < NREADY; i++) {
> +		if (ready_fds[i][0] > 0) {

Same `> 0` sentinel issue as in epoll_wait13. The static array is
zero-initialised, but fd 0 is a valid descriptor. Use {-1, -1}
initialisation and guard with `!= -1`.

--- [PATCH 5/5] ---

> +		nwoken = tst_atomic_load(woken);
> +		if (nwoken != round+1) {
> +			tst_res(TFAIL,
> +				"event %d woke %d waiters in total, expected %d",
> +				round+1, nwoken, round);

The condition tests `nwoken != round+1`, so the expected count is
`round+1`, but the third format argument is `round`. When round=0 and
nwoken=2 the message reads "expected 0" instead of "expected 1".
The last argument should be `round+1`.

Verdict - Needs revision

---
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