[LTP] [PATCH v4] Add epoll_wait07 test

[Richard Palethorpe]

Hello,

Pushed!

Andrea Cervesato <andrea.cervesato@suse.de> writes:

> From: Andrea Cervesato <andrea.cervesato@suse.com>
>
> This test verifies that EPOLLONESHOT is correctly handled by
> epoll_wait.
>
> Implements: https://github.com/linux-test-project/ltp/issues/860
> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
> ---
>  runtest/syscalls                              |  1 +
>  .../kernel/syscalls/epoll_wait/.gitignore     |  1 +
>  .../kernel/syscalls/epoll_wait/epoll_wait07.c | 73 +++++++++++++++++++
>  3 files changed, 75 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/epoll_wait/epoll_wait07.c
>
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 88e868a74..1cdba11ce 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -175,6 +175,7 @@ epoll_wait01 epoll_wait01
>  epoll_wait02 epoll_wait02
>  epoll_wait03 epoll_wait03
>  epoll_wait04 epoll_wait04
> +epoll_wait07 epoll_wait07
>  epoll_pwait01 epoll_pwait01
>  epoll_pwait02 epoll_pwait02
>  epoll_pwait03 epoll_pwait03
> diff --git a/testcases/kernel/syscalls/epoll_wait/.gitignore b/testcases/kernel/syscalls/epoll_wait/.gitignore
> index 222955dd2..c0be9a88e 100644
> --- a/testcases/kernel/syscalls/epoll_wait/.gitignore
> +++ b/testcases/kernel/syscalls/epoll_wait/.gitignore
> @@ -2,3 +2,4 @@ epoll_wait01
>  epoll_wait02
>  epoll_wait03
>  epoll_wait04
> +epoll_wait07
> diff --git a/testcases/kernel/syscalls/epoll_wait/epoll_wait07.c b/testcases/kernel/syscalls/epoll_wait/epoll_wait07.c
> new file mode 100644
> index 000000000..dfabd0d87
> --- /dev/null
> +++ b/testcases/kernel/syscalls/epoll_wait/epoll_wait07.c
> @@ -0,0 +1,73 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * Verify that EPOLLONESHOT is correctly handled by epoll_wait.
> + * We open a channel, write in it two times and verify that EPOLLIN has been
> + * received only once.
> + */
> +
> +#include <poll.h>
> +#include <sys/epoll.h>
> +#include "tst_test.h"
> +#include "tst_epoll.h"
> +
> +static int fds[2];
> +static int epfd;
> +
> +static void cleanup(void)
> +{
> +	if (epfd > 0)
> +		SAFE_CLOSE(epfd);
> +
> +	if (fds[0] > 0)
> +		SAFE_CLOSE(fds[0]);
> +
> +	if (fds[1] > 0)
> +		SAFE_CLOSE(fds[1]);
> +}
> +
> +static void run(void)
> +{
> +	struct epoll_event evt_receive;
> +	char buff = 'a';
> +
> +	SAFE_PIPE(fds);
> +
> +	tst_res(TINFO, "Polling on channel with EPOLLONESHOT");
> +
> +	epfd = SAFE_EPOLL_CREATE1(0);
> +
> +	SAFE_EPOLL_CTL(epfd, EPOLL_CTL_ADD, fds[0], &((struct epoll_event) {
> +		.events = EPOLLIN | EPOLLONESHOT,
> +		.data.fd = fds[0],
> +	}));
> +
> +	tst_res(TINFO, "Write channel for the 1st time. EPOLLIN expected");
> +
> +	SAFE_WRITE(0, fds[1], &buff, 1);
> +	TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 1);
> +	TST_EXP_EQ_LI(evt_receive.events & EPOLLIN, EPOLLIN);
> +	TST_EXP_EQ_LI(evt_receive.data.fd, fds[0]);
> +
> +	SAFE_READ(1, fds[0], &buff, 1);
> +	TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 0);
> +
> +	tst_res(TINFO, "Write channel for the 2nd time. No events expected");
> +
> +	SAFE_WRITE(0, fds[1], &buff, 1);
> +	TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 0);
> +
> +	SAFE_CLOSE(epfd);
> +	SAFE_CLOSE(fds[0]);
> +	SAFE_CLOSE(fds[1]);
> +}
> +
> +static struct tst_test test = {
> +	.cleanup = cleanup,
> +	.test_all = run,
> +};
> -- 
> 2.35.3


-- 
Thank you,
Richard.