[PATCH v2 11/11] vsock_test: wait for the remote to close the connection

Stefano Garzarella
2019-08-01T15:26:22Z

Before check if a send returns -EPIPE, we need to make sure the
connection is closed.
To do that, we use epoll API to wait EPOLLRDHUP or EPOLLHUP events
on the socket.

Reported-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
tools/testing/vsock/util.c | 38 ++++++++++++++++++++++++++++++++
tools/testing/vsock/util.h | 1 +
tools/testing/vsock/vsock_test.c | 10 +++++++++
3 files changed, 49 insertions(+)

diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
index 41b94495ecb1..425181fe196c 100644
--- a/tools/testing/vsock/util.c
+++ b/tools/testing/vsock/util.c
@@ -14,6 +14,7 @@
#include <signal.h>
#include <unistd.h>
#include <assert.h>
+#include <sys/epoll.h>

#include "timeout.h"
#include "control.h"
@@ -61,6 +62,43 @@ unsigned int vsock_get_local_cid(int fd)
return svm.svm_cid;
}

+/* Wait for the remote to close the connection */
+void vsock_wait_remote_close(int fd)
+{
+ struct epoll_event ev;
+ int epollfd, nfds;
+
+ epollfd = epoll_create1(0);
+ if (epollfd == -1) {
+ perror("epoll_create1");
+ exit(EXIT_FAILURE);
+ }
+
+ ev.events = EPOLLRDHUP | EPOLLHUP;
+ ev.data.fd = fd;
+ if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
+ perror("epoll_ctl");
+ exit(EXIT_FAILURE);
+ }
+
+ nfds = epoll_wait(epollfd, &ev, 1, TIMEOUT * 1000);
+ if (nfds == -1) {
+ perror("epoll_wait");
+ exit(EXIT_FAILURE);
+ }
+
+ if (nfds == 0) {
+ fprintf(stderr, "epoll_wait timed out\n");
+ exit(EXIT_FAILURE);
+ }
+
+ assert(nfds == 1);
+ assert(ev.events & (EPOLLRDHUP | EPOLLHUP));
+ assert(ev.data.fd == fd);
+
+ close(epollfd);
+}
+
/* Connect to <cid, port> and return the file descriptor. */
int vsock_stream_connect(unsigned int cid, unsigned int port)
{
diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h
index 7fdb8100f035..89816966c05b 100644
--- a/tools/testing/vsock/util.h
+++ b/tools/testing/vsock/util.h
@@ -45,6 +45,7 @@ int vsock_stream_connect(unsigned int cid, unsigned int port);
int vsock_stream_accept(unsigned int cid, unsigned int port,
struct sockaddr_vm *clientaddrp);
unsigned int vsock_get_local_cid(int fd);
+void vsock_wait_remote_close(int fd);
void send_byte(int fd, int expected_ret);
void recv_byte(int fd, int expected_ret);
void run_tests(const struct test_case *test_cases,
diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 64adf45501ca..a664675bec5a 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -84,6 +84,11 @@ static void test_stream_client_close_server(const struct test_opts *opts)

control_expectln("CLOSED");

+ /* Wait for the remote to close the connection, before check
+ * -EPIPE error on send.
+ */
+ vsock_wait_remote_close(fd);
+
send_byte(fd, -EPIPE);

/* Skip the read of data wrote by the peer if we are on VMCI and
@@ -113,6 +118,11 @@ static void test_stream_server_close_client(const struct test_opts *opts)

control_expectln("CLOSED");

+ /* Wait for the remote to close the connection, before check
+ * -EPIPE error on send.
+ */
+ vsock_wait_remote_close(fd);
+
send_byte(fd, -EPIPE);

/* Skip the read of data wrote by the peer if we are on VMCI and
--
2.20.1