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/* SPDX-License-Identifier: MIT */
/*
* Description: test POLL_ADD being added with a mask that doesn't make it
* trigger, but then updated with POLL_REMOVE to a mask that does
* trigger it.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <poll.h>
#include "liburing.h"
#include "helpers.h"
int main(int argc, char *argv[])
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
int ret, fd[2], i;
if (argc > 1)
return T_EXIT_SKIP;
ret = io_uring_queue_init(4, &ring, 0);
if (ret) {
fprintf(stderr, "queue_init: %d\n", ret);
return T_EXIT_FAIL;
}
if (pipe(fd) < 0) {
perror("pipe");
return T_EXIT_FAIL;
}
/*
* Attach POLLIN request to output side of pipe, won't complete as
* that will never be readabable.
*/
sqe = io_uring_get_sqe(&ring);
io_uring_prep_poll_add(sqe, fd[1], POLLIN);
sqe->user_data = 1;
io_uring_submit(&ring);
/*
* Now update the previously submitted poll request, adding POLLOUT.
* This will cause it to trigger immediately, as the pipe is indeed
* writeable.
*/
sqe = io_uring_get_sqe(&ring);
io_uring_prep_poll_remove(sqe, 1);
sqe->len = IORING_POLL_UPDATE_EVENTS;
sqe->poll32_events = POLLOUT;
sqe->user_data = 2;
io_uring_submit(&ring);
/*
* Expect both requests to complete - the update with 0 for success,
* and the original poll_add with POLLOUT as the result.
*/
for (i = 0; i < 2; i++) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe: %d\n", ret);
return T_EXIT_FAIL;
}
if (cqe->user_data == 1) {
if (cqe->res != POLLOUT) {
fprintf(stderr, "Original poll: %d\n", cqe->res);
return T_EXIT_FAIL;
}
} else if (cqe->user_data == 2) {
if (cqe->res) {
fprintf(stderr, "Poll update: %d\n", cqe->res);
return T_EXIT_FAIL;
}
}
io_uring_cqe_seen(&ring, cqe);
}
return T_EXIT_PASS;
}
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