Function main

test/buf-ring-nommap.c:20–130

static int bid = 89;

int main(int argc, char *argv[])
{
	struct io_uring_buf_ring *br;
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct io_uring ring;
	size_t ring_size;
	int ret, ring_mask, fds[2];
	struct io_uring_buf_reg reg = {
		.ring_entries = 1,
		.bgid = bgid,
		.flags = IOU_PBUF_RING_MMAP,
	};
	struct io_uring_params p = { };
	void *ring_mem;
	char buf[32];
	off_t off;

	if (argc > 1)
		return T_EXIT_SKIP;

	if (posix_memalign(&ring_mem, 16384, 16384))
		return T_EXIT_FAIL;

	memset(ring_mem, 0, 16384);

	p.flags = IORING_SETUP_NO_MMAP;
	ret = io_uring_queue_init_mem(1, &ring, &p, ring_mem, 16384);
	if (ret < 0) {
		if (ret == -EINVAL || ret == -ENOMEM) {
			free(ring_mem);
			return T_EXIT_SKIP;
		}
		fprintf(stderr, "queue init failed %d\n", ret);
		return T_EXIT_FAIL;
	}

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

	ring_size = sizeof(struct io_uring_buf);
	ring_mask = io_uring_buf_ring_mask(1);

	ret = io_uring_register_buf_ring(&ring, &reg, 0);
	if (ret) {
		if (ret == -EINVAL) {
			free(ring_mem);
			return T_EXIT_SKIP;
		}
		fprintf(stderr, "reg buf ring: %d\n", ret);
		return T_EXIT_FAIL;
	}

	off = IORING_OFF_PBUF_RING |
			(unsigned long long) bgid << IORING_OFF_PBUF_SHIFT;
	br = mmap(NULL, ring_size, PROT_READ | PROT_WRITE,