Function has_nonvec_read

test/read-write.c:372–403

}

static int has_nonvec_read(void)
{
	struct io_uring_probe *p;
	struct io_uring ring;
	int ret;

	ret = io_uring_queue_init(1, &ring, 0);
	if (ret) {
		fprintf(stderr, "queue init failed: %d\n", ret);
		exit(ret);
	}

	p = t_calloc(1, sizeof(*p) + 256 * sizeof(struct io_uring_probe_op));
	ret = io_uring_register_probe(&ring, p, 256);
	/* if we don't have PROBE_REGISTER, we don't have OP_READ/WRITE */
	if (ret == -EINVAL) {
out:
		io_uring_queue_exit(&ring);
		return 0;
	} else if (ret) {
		fprintf(stderr, "register_probe: %d\n", ret);
		goto out;
	}

	if (p->ops_len <= IORING_OP_READ)
		goto out;
	if (!(p->ops[IORING_OP_READ].flags & IO_URING_OP_SUPPORTED))
		goto out;
	io_uring_queue_exit(&ring);
	free(p);
	return 1;
}

static int test_eventfd_read(void)
{