linux-kernel - Re: [RFC PATCH v1 2/2] test/vsock: shutdowned socket test

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Date:   Wed, 2 Aug 2023 10:00:34 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v1 2/2] test/vsock: shutdowned socket test

On Tue, Aug 01, 2023 at 05:17:27PM +0300, Arseniy Krasnov wrote:
>This adds two tests for 'shutdown()' call. It checks that SIGPIPE is
>sent when MSG_NOSIGNAL is not set and vice versa. Both flags SHUT_WR
>and SHUT_RD are tested.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> tools/testing/vsock/vsock_test.c | 138 +++++++++++++++++++++++++++++++
> 1 file changed, 138 insertions(+)
>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 90718c2fd4ea..21d40a8d881c 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -19,6 +19,7 @@
> #include <time.h>
> #include <sys/mman.h>
> #include <poll.h>
>+#include <signal.h>
>
> #include "timeout.h"
> #include "control.h"
>@@ -1170,6 +1171,133 @@ static void test_seqpacket_msg_peek_server(const struct test_opts *opts)
> 	return test_msg_peek_server(opts, true);
> }
>
>+static bool have_sigpipe;
                  ^
We should define it as `volatile sig_atomic_t`:

the behavior is undefined if the signal handler refers to any object
[CX] [Option Start]  other than errno [Option End]  with static storage
duration other than by assigning a value to an object declared as
volatile sig_atomic_t

https://pubs.opengroup.org/onlinepubs/9699919799/functions/signal.html

The rest LGTM!

Thanks,
Stefano

>+
>+static void sigpipe(int signo)
>+{
>+	have_sigpipe = true;
>+}
>+
>+static void test_stream_check_sigpipe(int fd)
>+{
>+	ssize_t res;
>+
>+	have_sigpipe = false;
>+
>+	res = send(fd, "A", 1, 0);
>+	if (res != -1) {
>+		fprintf(stderr, "expected send(2) failure, got %zi\n", res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (!have_sigpipe) {
>+		fprintf(stderr, "SIGPIPE expected\n");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	have_sigpipe = false;
>+
>+	res = send(fd, "A", 1, MSG_NOSIGNAL);
>+	if (res != -1) {
>+		fprintf(stderr, "expected send(2) failure, got %zi\n", res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (have_sigpipe) {
>+		fprintf(stderr, "SIGPIPE not expected\n");
>+		exit(EXIT_FAILURE);
>+	}
>+}
>+
>+static void test_stream_shutwr_client(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	struct sigaction act = {
>+		.sa_handler = sigpipe,
>+	};
>+
>+	sigaction(SIGPIPE, &act, NULL);
>+
>+	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	if (fd < 0) {
>+		perror("connect");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (shutdown(fd, SHUT_WR)) {
>+		perror("shutdown");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	test_stream_check_sigpipe(fd);
>+
>+	control_writeln("CLIENTDONE");
>+
>+	close(fd);
>+}
>+
>+static void test_stream_shutwr_server(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	if (fd < 0) {
>+		perror("accept");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	control_expectln("CLIENTDONE");
>+
>+	close(fd);
>+}
>+
>+static void test_stream_shutrd_client(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	struct sigaction act = {
>+		.sa_handler = sigpipe,
>+	};
>+
>+	sigaction(SIGPIPE, &act, NULL);
>+
>+	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	if (fd < 0) {
>+		perror("connect");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	control_expectln("SHUTRDDONE");
>+
>+	test_stream_check_sigpipe(fd);
>+
>+	control_writeln("CLIENTDONE");
>+
>+	close(fd);
>+}
>+
>+static void test_stream_shutrd_server(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	if (fd < 0) {
>+		perror("accept");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (shutdown(fd, SHUT_RD)) {
>+		perror("shutdown");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	control_writeln("SHUTRDDONE");
>+	control_expectln("CLIENTDONE");
>+
>+	close(fd);
>+}
>+
> static struct test_case test_cases[] = {
> 	{
> 		.name = "SOCK_STREAM connection reset",
>@@ -1250,6 +1378,16 @@ static struct test_case test_cases[] = {
> 		.run_client = test_seqpacket_msg_peek_client,
> 		.run_server = test_seqpacket_msg_peek_server,
> 	},
>+	{
>+		.name = "SOCK_STREAM SHUT_WR",
>+		.run_client = test_stream_shutwr_client,
>+		.run_server = test_stream_shutwr_server,
>+	},
>+	{
>+		.name = "SOCK_STREAM SHUT_RD",
>+		.run_client = test_stream_shutrd_client,
>+		.run_server = test_stream_shutrd_server,
>+	},
> 	{},
> };
>
>-- 
>2.25.1
>