Update contrib/libs/liburing to 2.4

1 files changed, 74 insertions, 0 deletions

diff --git a/contrib/libs/liburing/test/evloop.c b/contrib/libs/liburing/test/evloop.c
new file mode 100644
index 00000000000..a4339d9471f
--- /dev/null
+++ b/contrib/libs/liburing/test/evloop.c
@@ -0,0 +1,74 @@
+#include "../config-host.h"
+/* SPDX-License-Identifier: MIT */
+/*
+ * Test that we don't recursively generate completion events if an io_uring
+ * has an eventfd registered that triggers on completions, and we add a poll
+ * request with multishot on the eventfd. Older kernels will stop on overflow,
+ * newer kernels will detect this earlier and abort correctly.
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include <sys/types.h>
+#include <poll.h>
+#include <assert.h>
+#include "liburing.h"
+#include "helpers.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	int ret, efd, i;
+
+	if (argc > 1)
+		return T_EXIT_SKIP;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "Ring init failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	efd = eventfd(0, 0);
+	if (efd < 0) {
+		perror("eventfd");
+		return T_EXIT_FAIL;
+	}
+
+	ret = io_uring_register_eventfd(&ring, efd);
+	if (ret) {
+		fprintf(stderr, "Ring eventfd register failed: %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_poll_multishot(sqe, efd, POLLIN);
+	sqe->user_data = 1;
+	io_uring_submit(&ring);
+
+	sqe = io_uring_get_sqe(&ring);
+	sqe->user_data = 2;
+	io_uring_prep_nop(sqe);
+	io_uring_submit(&ring);
+
+	for (i = 0; i < 2; i++) {
+		ret = io_uring_wait_cqe(&ring, &cqe);
+		if (ret) {
+			fprintf(stderr, "wait_cqe ret = %d\n", ret);
+			break;
+		}
+		io_uring_cqe_seen(&ring, cqe);
+	}
+
+	ret = io_uring_peek_cqe(&ring, &cqe);
+	if (!ret) {
+		fprintf(stderr, "Generated too many events\n");
+		return T_EXIT_FAIL;
+	}
+
+	return T_EXIT_PASS;
+}