[LTP] [PATCH v2 1/2] poll: add basic POLLHUP semantics test

[Cyril Hrubis]

Hi!
> Add a basic poll() test to verify that POLLHUP is reported when the
> peer end of a pipe is closed.
> 
> The test creates a pipe, closes the write end, and polls the read end
> for POLLIN events. poll() is expected to return successfully and set
> POLLHUP in revents.
> 
> This covers basic poll() lifecycle semantics that were not previously
> tested.
> 
> Signed-off-by: Jinseok Kim <always.starving0@gmail.com>
> ---
>  testcases/kernel/syscalls/poll/poll03.c | 62 +++++++++++++++++++++++++

This is missing runtest entry in runtest/syscalls file.

> +void verify_pollhup(void)
> +{
> +	struct pollfd pfd = {
> +		.fd = fds[0], .events = POLLIN,
> +	};
> +
> +	SAFE_CLOSE(fds[1]);

Doesn't this fail the test on a second iteration? Have you tried to run
the test with -i 2?

The fd should be closed only once in the setup.

> +	TEST(poll(&pfd, 1, -1));
> +
> +	if (TST_RET == -1) {
> +		tst_res(TFAIL | TTERRNO, "poll() failed");
> +		return;
> +	}
> +
> +	if (TST_RET != 1) {
> +		tst_res(TFAIL, "Unexpected poll() return value %ld", TST_RET);
> +		return;
> +	}
> +
> +	TST_EXP_EXPR(pfd.revents & POLLHUP);
> +	TST_EXP_EXPR((pfd.revents & ~POLLHUP) == 0);
> +
> +	tst_res(TPASS, "poll() reported POLLHUP");
> +}
> +
> +static void setup(void)
> +{
> +	SAFE_PIPE(fds);
> +}
> +
> +static void cleanup(void)
> +{
> +	if (fds[0] > 0)
> +		SAFE_CLOSE(fds[0]);
> +
> +	if (fds[1] > 0)
> +		SAFE_CLOSE(fds[1]);
> +}
> +
> +static struct tst_test test = {
> +	.setup = setup,
> +	.cleanup = cleanup,
> +	.test_all = verify_pollhup,
> +};
> --
> 2.43.0

-- 
Cyril Hrubis
chrubis@suse.cz