[PATCH v2 10/11] vsock_test: skip read() in test_stream*close tests on a VMCI host

[Stefano Garzarella]

When VMCI transport is used, if the guest closes a connection,
all data is gone and EOF is returned, so we should skip the read
of data written by the peer before closing the connection.

Reported-by: Jorgen Hansen <jhan...@vmware.com>
Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
---
 tools/testing/vsock/vsock_test.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index cb606091489f..64adf45501ca 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -71,6 +71,7 @@ static void test_stream_client_close_client(const struct 
test_opts *opts)
 
 static void test_stream_client_close_server(const struct test_opts *opts)
 {
+       unsigned int local_cid;
        int fd;
 
        fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
@@ -79,16 +80,27 @@ static void test_stream_client_close_server(const struct 
test_opts *opts)
                exit(EXIT_FAILURE);
        }
 
+       local_cid = vsock_get_local_cid(fd);
+
        control_expectln("CLOSED");
 
        send_byte(fd, -EPIPE);
-       recv_byte(fd, 1);
+
+       /* Skip the read of data wrote by the peer if we are on VMCI and
+        * we are on the host side, because when the guest closes a
+        * connection, all data is gone and EOF is returned.
+        */
+       if (!(opts->transport == TEST_TRANSPORT_VMCI &&
+           local_cid == VMADDR_CID_HOST))
+               recv_byte(fd, 1);
+
        recv_byte(fd, 0);
        close(fd);
 }
 
 static void test_stream_server_close_client(const struct test_opts *opts)
 {
+       unsigned int local_cid;
        int fd;
 
        fd = vsock_stream_connect(opts->peer_cid, 1234);
@@ -97,10 +109,20 @@ static void test_stream_server_close_client(const struct 
test_opts *opts)
                exit(EXIT_FAILURE);
        }
 
+       local_cid = vsock_get_local_cid(fd);
+
        control_expectln("CLOSED");
 
        send_byte(fd, -EPIPE);
-       recv_byte(fd, 1);
+
+       /* Skip the read of data wrote by the peer if we are on VMCI and
+        * we are on the host side, because when the guest closes a
+        * connection, all data is gone and EOF is returned.
+        */
+       if (!(opts->transport == TEST_TRANSPORT_VMCI &&
+           local_cid == VMADDR_CID_HOST))
+               recv_byte(fd, 1);
+
        recv_byte(fd, 0);
        close(fd);
 }
-- 
2.20.1