liburing/test/poll-cancel.c

/*
 * 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 "../src/liburing.h"

struct poll_data {
	unsigned is_poll;
	unsigned is_cancel;
};

static void sig_alrm(int sig)
{
	printf("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 (pipe(pipe1) != 0) {
		printf("pipe failed\n");
		return 1;
	}

	ret = io_uring_queue_init(2, &ring, 0);
	if (ret) {
		printf("child: ring setup failed\n");
		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) {
		printf("child: 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) {
		printf("child: sqe submit failed\n");
		return 1;
	}

	sqe = io_uring_get_sqe(&ring);
	if (!sqe) {
		printf("child: get sqe failed\n");
		return 1;
	}

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

	ret = io_uring_submit(&ring);
	if (ret <= 0) {
		printf("child: sqe submit failed\n");
		return 1;
	}

	ret = io_uring_wait_completion(&ring, &cqe);
	if (ret < 0) {
		printf("child: get cqe failed\n");
		return 1;
	}

	pd = (struct poll_data *) (uintptr_t) cqe->user_data;
	if (cqe->res != 0) {
		printf("sqe (add=%d/remove=%d) failed with %ld\n", pd->is_poll,
							pd->is_cancel, (long) cqe->res);
		return 1;
	}

	ret = io_uring_wait_completion(&ring, &cqe);
	if (ret < 0) {
		printf("parent: get failed\n");
		return 1;
	}

	pd = (struct poll_data *) (uintptr_t) cqe->user_data;
	if (cqe->res != 0) {
		printf("sqe (add=%d/remove=%d) failed with %ld\n", pd->is_poll,
							pd->is_cancel, (long) cqe->res);
		return 1;
	}

	return 0;
}