/* SPDX-License-Identifier: MIT */
/*
 * Description: open+read+close link sequence with fd passing
 *
 */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>

#include "liburing.h"

static int test_orc(struct io_uring *ring, const char *fname)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	char buf[4096];
	int ret, i;

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_openat(sqe, AT_FDCWD, fname, O_RDONLY, 0);
	sqe->flags |= IOSQE_IO_LINK;
	sqe->user_data = IORING_OP_OPENAT;

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_read(sqe, -4096, buf, sizeof(buf), 0);
	sqe->flags |= IOSQE_IO_LINK;
	sqe->user_data = IORING_OP_READ;

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_close(sqe, -4096);
	sqe->user_data = IORING_OP_CLOSE;

	ret = io_uring_submit(ring);
	if (ret != 3) {
		fprintf(stderr, "sqe submit failed: %d\n", ret);
		goto err;
	}

	for (i = 0; i < 3; i++) {
		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret < 0) {
			fprintf(stderr, "wait completion %d\n", ret);
			goto err;
		}

		printf("%d: op=%u, res=%d\n", i, (unsigned) cqe->user_data, cqe->res);
		io_uring_cqe_seen(ring, cqe);
	}

	return 0;
err:
	return 1;
}

int main(int argc, char *argv[])
{
	struct io_uring ring;
	int ret;

	if (argc < 2) {
		fprintf(stderr, "%s: <file>\n", argv[0]);
		return 1;
	}

	ret = io_uring_queue_init(8, &ring, 0);
	if (ret) {
		fprintf(stderr, "ring setup failed: %d\n", ret);
		return 1;
	}

	ret = test_orc(&ring, argv[1]);
	if (ret) {
		fprintf(stderr, "test_orc failed\n");
		return ret;
	}

	return 0;
}