/* SPDX-License-Identifier: MIT */

/*

 * Description: run various nop tests

 *

 */

#include <errno.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <fcntl.h>

#include <sys/poll.h>

#include <sys/eventfd.h>

#include "liburing.h"

int main(int argc, char *argv[])

{

	struct io_uring_params p = {};

	struct io_uring_sqe *sqe;

	struct io_uring_cqe *cqe;

	struct io_uring ring;

	uint64_t ptr;

	struct iovec vec = {

		.iov_base = &ptr,

		.iov_len = sizeof(ptr)

	};

	int ret, evfd, i;

	if (argc > 1)

		return 0;

	ret = io_uring_queue_init_params(8, &ring, &p);

	if (ret) {

		fprintf(stderr, "ring setup failed: %d\n", ret);

		return 1;

	}

	if (!(p.features & IORING_FEAT_CUR_PERSONALITY)) {

		fprintf(stdout, "Skipping\n");

		return 0;

	}

	evfd = eventfd(0, EFD_CLOEXEC);

	if (evfd < 0) {

		perror("eventfd");

		return 1;

	}

	ret = io_uring_register_eventfd(&ring, evfd);

	if (ret) {

		fprintf(stderr, "failed to register evfd: %d\n", ret);

		return 1;

	}

	sqe = io_uring_get_sqe(&ring);

	io_uring_prep_poll_add(sqe, evfd, POLLIN);

	sqe->flags |= IOSQE_IO_LINK;

	sqe->user_data = 1;

	sqe = io_uring_get_sqe(&ring);

	io_uring_prep_readv(sqe, evfd, &vec, 1, 0);

	sqe->flags |= IOSQE_IO_LINK;

	sqe->user_data = 2;

	ret = io_uring_submit(&ring);

	if (ret != 2) {

		fprintf(stderr, "submit: %d\n", ret);

		return 1;

	}

	sqe = io_uring_get_sqe(&ring);

	io_uring_prep_nop(sqe);

	sqe->user_data = 3;

	ret = io_uring_submit(&ring);

	if (ret != 1) {

		fprintf(stderr, "submit: %d\n", ret);

		return 1;

	}

	for (i = 0; i < 3; i++) {

		ret = io_uring_wait_cqe(&ring, &cqe);

		if (ret) {

			fprintf(stderr, "wait: %d\n", ret);

			return 1;

		}

		switch (cqe->user_data) {

		case 1:

			/* POLLIN */

			if (cqe->res != 1) {

				fprintf(stderr, "poll: %d\n", cqe->res);

				return 1;

			}

			break;

		case 2:

			if (cqe->res != sizeof(ptr)) {

				fprintf(stderr, "read: %d\n", cqe->res);

				return 1;

			}

			break;

		case 3:

			if (cqe->res) {

				fprintf(stderr, "nop: %d\n", cqe->res);

				return 1;

			}

			break;

		}

		io_uring_cqe_seen(&ring, cqe);

	}

	return 0;

}