Function test_one_read

test/buf-ring.c:257–295

}

static int test_one_read(int fd, int bgid, struct io_uring *ring)
{
	int ret;
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
		fprintf(stderr, "get sqe failed\n");
		return -1;
	}

	io_uring_prep_read(sqe, fd, NULL, 1, 0);
	sqe->flags |= IOSQE_BUFFER_SELECT;
	sqe->buf_group = bgid;
	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "sqe submit failed: %d\n", ret);
		return -1;
	}

	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "wait completion %d\n", ret);
		return -1;
	}
	ret = cqe->res;
	io_uring_cqe_seen(ring, cqe);

	if (ret == -ENOBUFS)
		return ret;

	if (ret != 1) {
		fprintf(stderr, "read result %d\n", ret);
		return -1;
	}

	return cqe->flags >> 16;
}

static int test_running(int bgid, int entries, int loops, int use_mmap)
{