1 files changed, 60 insertions, 0 deletions
diff --git a/test/tty-write-dpoll.c b/test/tty-write-dpoll.c
new file mode 100644
index 0000000..ea9df1d
--- /dev/null
+++ b/test/tty-write-dpoll.c
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Test double poll tty write. A test case for the regression fixed by:
+ *
+ * commit 6e295a664efd083ac9a5c1a8130c45be1db0cde7
+ * Author: Jens Axboe <axboe@kernel.dk>
+ * Date:   Tue Mar 22 13:11:28 2022 -0600
+ *
+ *   io_uring: fix assuming triggered poll waitqueue is the single poll
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+#include "helpers.h"
+
+#define	SQES	128
+#define BUFSIZE	512
+
+int main(int argc, char *argv[])
+{
+	static char buf[BUFSIZE];
+	struct iovec vecs[SQES];
+	struct io_uring ring;
+	int ret, i, fd;
+
+	if (argc > 1)
+		return 0;
+
+	fd = open("/dev/ttyS0", O_RDWR | O_NONBLOCK);
+	if (fd < 0)
+		return 0;
+
+	ret = t_create_ring(SQES, &ring, 0);
+	if (ret == T_SETUP_SKIP)
+		return 0;
+	else if (ret < 0)
+		return 1;
+
+	for (i = 0; i < SQES; i++) {
+		struct io_uring_sqe *sqe;
+
+		sqe = io_uring_get_sqe(&ring);
+		vecs[i].iov_base = buf;
+		vecs[i].iov_len = sizeof(buf);
+		io_uring_prep_writev(sqe, fd, &vecs[i], 1, 0);
+	}
+
+	ret = io_uring_submit(&ring);
+	if (ret != SQES) {
+		fprintf(stderr, "submit: %d\n", ret);
+		return 1;
+	}
+
+	return 0;
+}