/* SPDX-License-Identifier: MIT */

/*

 * Test case for SQPOLL missing a 'ret' clear in case of busy.

 *

 * Heavily based on a test case from

 * Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

 */

#include <stdio.h>

#include <stdlib.h>

#include <fcntl.h>

#include <unistd.h>

#include <string.h>

#include "liburing.h"

#define FILE_SIZE	(128 * 1024)

static int create_file(const char *file)

{

	ssize_t ret;

	char *buf;

	int fd;

	buf = malloc(FILE_SIZE);

	memset(buf, 0xaa, FILE_SIZE);

	fd = open(file, O_WRONLY | O_CREAT, 0644);

	if (fd < 0) {

		perror("open file");

		return 1;

	}

	ret = write(fd, buf, FILE_SIZE);

	fsync(fd);

	close(fd);

	return ret != FILE_SIZE;

}

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

{

	struct io_uring ring;

	int i, fd, ret;

	struct io_uring_sqe *sqe;

	struct io_uring_cqe *cqe;

	struct iovec *iovecs;

	struct io_uring_params p;

	char *fname;

	void *buf;

	if (geteuid()) {

		fprintf(stdout, "Test requires root, skipping\n");

		return 0;

	}

	memset(&p, 0, sizeof(p));

	p.flags = IORING_SETUP_SQPOLL;

	ret = io_uring_queue_init_params(4, &ring, &p);

	if (ret < 0) {

		fprintf(stderr, "queue_init: %s\n", strerror(-ret));

		return 1;

	}

	if (argc > 1) {

		fname = argv[1];

	} else {

		fname = ".sqpoll.tmp";

		if (create_file(fname)) {

			fprintf(stderr, "file creation failed\n");

			goto out;

		}

	}

	fd = open(fname, O_RDONLY | O_DIRECT);

	if (fd < 0) {

		perror("open");

		goto out;

	}

	iovecs = calloc(10, sizeof(struct iovec));

	for (i = 0; i < 10; i++) {

		if (posix_memalign(&buf, 4096, 4096))

			goto out;

		iovecs[i].iov_base = buf;

		iovecs[i].iov_len = 4096;

	}

	ret = io_uring_register_files(&ring, &fd, 1);

	if (ret < 0) {

		fprintf(stderr, "register files %d\n", ret);

		goto out;

	}

	for (i = 0; i < 10; i++) {

		sqe = io_uring_get_sqe(&ring);

		if (!sqe)

			break;

		io_uring_prep_readv(sqe, 0, &iovecs[i], 1, 0);

		sqe->flags |= IOSQE_FIXED_FILE;

		ret = io_uring_submit(&ring);

		usleep(1000);

	}

	for (i = 0; i < 10; i++) {

		ret = io_uring_wait_cqe(&ring, &cqe);

		if (ret) {

			fprintf(stderr, "wait_cqe=%d\n", ret);

			break;

		}

		if (cqe->res != 4096) {

			fprintf(stderr, "ret=%d, wanted 4096\n", cqe->res);

			ret = 1;

			break;

		}

		io_uring_cqe_seen(&ring, cqe);

	}

	close(fd);

out:

	if (fname != argv[1])

		unlink(fname);

	io_uring_queue_exit(&ring);

	return ret;

}