af_unix: Add test for consecutive consumed OOB.

Let's add a test case where consecutive concumed OOB skbs stay
at the head of the queue.

Without the previous patch, ioctl(SIOCATMARK) assertion fails.

Before:

  #  RUN           msg_oob.no_peek.ex_oob_ex_oob_oob ...
  # msg_oob.c:305:ex_oob_ex_oob_oob:Expected answ[0] (0) == oob_head (1)
  # ex_oob_ex_oob_oob: Test terminated by assertion
  #          FAIL  msg_oob.no_peek.ex_oob_ex_oob_oob
  not ok 12 msg_oob.no_peek.ex_oob_ex_oob_oob

After:

  #  RUN           msg_oob.no_peek.ex_oob_ex_oob_oob ...
  #            OK  msg_oob.no_peek.ex_oob_ex_oob_oob
  ok 12 msg_oob.no_peek.ex_oob_ex_oob_oob

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250619041457.1132791-3-kuni1840@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/tools/testing/selftests/net/af_unix/msg_oob.c b/tools/testing/selftests/net/af_unix/msg_oob.c
index 3ed3882a93b8b17fc68b450d65cfa5c0e7ce8124..918509a3f04005775b4790bc3c5548216244cd79 100644 (file)
--- a/tools/testing/selftests/net/af_unix/msg_oob.c
+++ b/tools/testing/selftests/net/af_unix/msg_oob.c
@@ -548,6 +548,29 @@ TEST_F(msg_oob, ex_oob_oob)
        siocatmarkpair(false);
 }
 
+TEST_F(msg_oob, ex_oob_ex_oob_oob)
+{
+       sendpair("x", 1, MSG_OOB);
+       epollpair(true);
+       siocatmarkpair(true);
+
+       recvpair("x", 1, 1, MSG_OOB);
+       epollpair(false);
+       siocatmarkpair(true);
+
+       sendpair("y", 1, MSG_OOB);
+       epollpair(true);
+       siocatmarkpair(true);
+
+       recvpair("y", 1, 1, MSG_OOB);
+       epollpair(false);
+       siocatmarkpair(true);
+
+       sendpair("z", 1, MSG_OOB);
+       epollpair(true);
+       siocatmarkpair(true);
+}
+
 TEST_F(msg_oob, ex_oob_ahead_break)
 {
        sendpair("hello", 5, MSG_OOB);