[PATCH liburing] Fix incorrect close in test for multishot accept

[Donald Hunter <donald.hunter@gmail.com>]

This fixes a bug in accept_conn handling in the accept tests that caused it
to incorrectly skip the multishot tests and also lose the warning message
to a closed stdout. This can be seen in the strace output below.

close(1)                                = 0
io_uring_setup(32, { ...
...
write(1, "Fixed Multishot Accept not suppo"..., 47) = -1 EINVAL

Unfortunately this exposes a a bug with gcc -O2 where multishot_mask logic
gets optimized incorrectly and "Fixed Multishot Accept misses events" is
wrongly reported. I am investigating this separately.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
---
 test/accept.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/test/accept.c b/test/accept.c
index 7bc6226..fb87a1d 100644
--- a/test/accept.c
+++ b/test/accept.c
@@ -103,7 +103,7 @@ static void queue_accept_conn(struct io_uring *ring, int fd,
 	}
 }
 
-static int accept_conn(struct io_uring *ring, int fixed_idx)
+static int accept_conn(struct io_uring *ring, int fixed_idx, bool multishot)
 {
 	struct io_uring_cqe *cqe;
 	int ret;
@@ -115,8 +115,10 @@ static int accept_conn(struct io_uring *ring, int fixed_idx)
 
 	if (fixed_idx >= 0) {
 		if (ret > 0) {
-			close(ret);
-			return -EINVAL;
+			if (!multishot) {
+				close(ret);
+				return -EINVAL;
+			}
 		} else if (!ret) {
 			ret = fixed_idx;
 		}
@@ -208,7 +210,7 @@ static int test_loop(struct io_uring *ring,
 		queue_accept_conn(ring, recv_s0, args);
 
 	for (i = 0; i < MAX_FDS; i++) {
-		s_fd[i] = accept_conn(ring, args.fixed ? 0 : -1);
+		s_fd[i] = accept_conn(ring, args.fixed ? 0 : -1, multishot);
 		if (s_fd[i] == -EINVAL) {
 			if (args.accept_should_error)
 				goto out;
-- 
2.36.1