Function test

test/ringbuf-status.c:80–219

}

static int test(int invalid)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct io_uring ring;
	struct io_uring_buf_ring *br;
	int ret, i, fds[2];
	uint16_t head;
	char *buf;
	void *ptr;
	char output[16];

	memset(output, 0x55, sizeof(output));

	ret = io_uring_queue_init(NR_BUFS, &ring, 0);
	if (ret) {
		fprintf(stderr, "ring setup failed: %d\n", ret);
		return 1;
	}

	if (pipe(fds) < 0) {
		perror("pipe");
		return T_EXIT_FAIL;
	}

	if (posix_memalign((void **) &buf, 4096, FSIZE))
		return 1;

	br = io_uring_setup_buf_ring(&ring, NR_BUFS, BGID, 0, &ret);
	if (!br) {
		if (ret == -EINVAL) {
			no_buf_ring = 1;
			free(buf);
			return 0;
		}
		fprintf(stderr, "Buffer ring register failed %d\n", ret);
		return 1;
	}

	ptr = buf;
	for (i = 0; i < NR_BUFS; i++) {
		io_uring_buf_ring_add(br, ptr, BUF_SIZE, i + 1, BR_MASK, i);
		ptr += BUF_SIZE;
	}
	io_uring_buf_ring_advance(br, NR_BUFS);

	/* head should be zero at this point */
	head = 1;
	if (!invalid)
		ret = io_uring_buf_ring_head(&ring, BGID, &head);
	else
		ret = io_uring_buf_ring_head(&ring, BGID + 10, &head);
	if (ret) {
		if (ret == -EINVAL) {
			no_buf_ring_status = 1;
			free(buf);
			return T_EXIT_SKIP;
		}