test/poll-cancel.c

/* SPDX-License-Identifier: MIT */
/*
 * Description: test io_uring poll cancel handling
 *
 */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <sys/signal.h>

#include "liburing.h"

struct poll_data {
	unsigned is_poll;
	unsigned is_cancel;
};

static void sig_alrm(int sig)
{
	fprintf(stderr, "Timed out!\n");
	exit(1);
}

int main(int argc, char *argv[])
{
	struct io_uring ring;
	int pipe1[2];
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct poll_data *pd, pds[2];
	struct sigaction act;
	int ret;

	if (argc > 1)
		return 0;

	if (pipe(pipe1) != 0) {
		perror("pipe");
		return 1;
	}

	ret = io_uring_queue_init(2, &ring, 0);
	if (ret) {
		fprintf(stderr, "ring setup failed: %d\n", ret);
		return 1;
	}

	memset(&act, 0, sizeof(act));
	act.sa_handler = sig_alrm;
	act.sa_flags = SA_RESTART;
	sigaction(SIGALRM, &act, NULL);
	alarm(1);

	sqe = io_uring_get_sqe(&ring);
	if (!sqe) {
		fprintf(stderr, "get sqe failed\n");
		return 1;
	}

	io_uring_prep_poll_add(sqe, pipe1[0], POLLIN);

	pds[0].is_poll = 1;
	pds[0].is_cancel = 0;
	io_uring_sqe_set_data(sqe, &pds[0]);

	ret = io_uring_submit(&ring);
	if (ret <= 0) {
		fprintf(stderr, "sqe submit failed\n");
		return 1;
	}

	sqe = io_uring_get_sqe(&ring);
	if (!sqe) {
		fprintf(stderr, "get sqe failed\n");
		return 1;
	}

	pds[1].is_poll = 0;
	pds[1].is_cancel = 1;
	io_uring_prep_poll_remove(sqe, &pds[0]);
	io_uring_sqe_set_data(sqe, &pds[1]);

	ret = io_uring_submit(&ring);
	if (ret <= 0) {
		fprintf(stderr, "sqe submit failed: %d\n", ret);
		return 1;
	}

	ret = io_uring_wait_cqe(&ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "wait cqe failed: %d\n", ret);
		return 1;
	}

	pd = io_uring_cqe_get_data(cqe);
	if (pd->is_poll && cqe->res != -ECANCELED) {
		fprintf(stderr ,"sqe (add=%d/remove=%d) failed with %ld\n",
					pd->is_poll, pd->is_cancel,
					(long) cqe->res);
		return 1;
	} else if (pd->is_cancel && cqe->res) {
		fprintf(stderr, "sqe (add=%d/remove=%d) failed with %ld\n",
					pd->is_poll, pd->is_cancel,
					(long) cqe->res);
		return 1;
	}
	io_uring_cqe_seen(&ring, cqe);

	ret = io_uring_wait_cqe(&ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "wait_cqe: %d\n", ret);
		return 1;
	}

	pd = io_uring_cqe_get_data(cqe);
	if (pd->is_poll && cqe->res != -ECANCELED) {
		fprintf(stderr, "sqe (add=%d/remove=%d) failed with %ld\n",
					pd->is_poll, pd->is_cancel,
					(long) cqe->res);
		return 1;
	} else if (pd->is_cancel && cqe->res) {
		fprintf(stderr, "sqe (add=%d/remove=%d) failed with %ld\n",
					pd->is_poll, pd->is_cancel,
					(long) cqe->res);
		return 1;
	}

	io_uring_cqe_seen(&ring, cqe);
	return 0;
}