test/read-before-exit.c

/* SPDX-License-Identifier: MIT */
/*
 * Description: test if issuing IO from thread and immediately exiting will
 * proceed correctly.
 *
 * Original test case from: https://github.com/axboe/liburing/issues/582
 */
#include <unistd.h>
#include <pthread.h>
#include <sys/timerfd.h>
#include <string.h>
#include <stdio.h>

#include "liburing.h"
#include "helpers.h"

struct data {
        struct io_uring *ring;
        int timer_fd1;
        int timer_fd2;
        uint64_t buf1;
        uint64_t buf2;
};

void *submit(void *data)
{
	struct io_uring_sqe *sqe;
	struct data *d = data;
	int ret;

	sqe = io_uring_get_sqe(d->ring);
	io_uring_prep_read(sqe, d->timer_fd1, &d->buf1, sizeof(d->buf1), 0);

	sqe = io_uring_get_sqe(d->ring);
	io_uring_prep_read(sqe, d->timer_fd2, &d->buf2, sizeof(d->buf2), 0);

	ret = io_uring_submit(d->ring);
	if (ret != 2)
		return (void *) (uintptr_t) 1;

	/* Exit suddenly. */
	return NULL;
}

static int test(int flags)
{
	struct io_uring_params params = { .flags = flags, };
	struct io_uring ring;
	struct data d = { .ring = &ring, };
	pthread_t thread;
	void *res;
	int ret;

	ret = t_create_ring_params(8, &ring, &params);
	if (ret == T_SETUP_SKIP)
		return 0;
	else if (ret != T_SETUP_OK)
		return 1;

	d.timer_fd1 = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
	if (d.timer_fd1 < 0) {
		perror("timerfd_create");
		return 1;
	}
	d.timer_fd2 = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
	if (d.timer_fd2 < 0) {
		perror("timerfd_create");
		return 1;
	}

	pthread_create(&thread, NULL, submit, &d);
	pthread_join(thread, &res);

	/** Wait for completions and do stuff ...  **/

	io_uring_queue_exit(&ring);

	close(d.timer_fd1);
	close(d.timer_fd2);
	return !!res;
}

int main(int argc, char *argv[])
{
	int ret, i;

	for (i = 0; i < 1000; i++) {
		ret = test(0);
		if (ret) {
			fprintf(stderr, "Test failed\n");
			return ret;
		}
	}

	for (i = 0; i < 1000; i++) {
		ret = test(IORING_SETUP_IOPOLL);
		if (ret) {
			fprintf(stderr, "Test IOPOLL failed\n");
			return ret;
		}
	}

	for (i = 0; i < 100; i++) {
		ret = test(IORING_SETUP_SQPOLL);
		if (ret) {
			fprintf(stderr, "Test SQPOLL failed\n");
			return ret;
		}
	}

	return 0;
}