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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
/*
* Description: test multishot POLL_ADD on an eventfd that is also the
* CQ notification eventfd of the same ring. Triggering the poll
* posts a CQE, which notifies the eventfd, which re-enters the
* poll wake path via EPOLL_URING_WAKE. The multishot poll must
* keep delivering events for subsequent wakeups; a regression
* here leaves the poll request permanently stuck with
* IORING_CQE_F_MORE set but no further CQEs.
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <poll.h>
#include <sys/eventfd.h>
#include "liburing.h"
#include "helpers.h"
#define NR_LOOPS 2
static int test(void)
{
struct __kernel_timespec ts;
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct io_uring ring;
int ret, evfd, i;
uint64_t val;
evfd = eventfd(0, EFD_NONBLOCK);
if (evfd < 0) {
perror("eventfd");
return T_EXIT_FAIL;
}
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "queue_init: %d\n", ret);
close(evfd);
return T_EXIT_FAIL;
}
ret = io_uring_register_eventfd(&ring, evfd);
if (ret) {
fprintf(stderr, "register_eventfd: %d\n", ret);
close(evfd);
io_uring_queue_exit(&ring);
return T_EXIT_FAIL;
}
sqe = io_uring_get_sqe(&ring);
io_uring_prep_poll_multishot(sqe, evfd, POLLIN);
sqe->user_data = 1;
ret = io_uring_submit(&ring);
if (ret != 1) {
fprintf(stderr, "submit: %d\n", ret);
goto err;
}
for (i = 0; i < NR_LOOPS; i++) {
val = 1;
ret = write(evfd, &val, sizeof(val));
if (ret != sizeof(val)) {
perror("write");
goto err;
}
ret = read(evfd, &val, sizeof(val));
if (ret != sizeof(val)) {
perror("read");
goto err;
}
ts.tv_sec = 1;
ts.tv_nsec = 0;
ret = io_uring_wait_cqe_timeout(&ring, &cqe, &ts);
if (ret == -ETIME) {
fprintf(stderr, "poll stuck: no CQE after iteration %d\n", i);
goto err;
}
if (ret < 0) {
fprintf(stderr, "wait_cqe: %d\n", ret);
goto err;
}
if (cqe->user_data != 1) {
fprintf(stderr, "unexpected user_data %llx\n",
(unsigned long long) cqe->user_data);
io_uring_cqe_seen(&ring, cqe);
goto err;
}
if (cqe->res < 0) {
fprintf(stderr, "cqe res: %d\n", cqe->res);
io_uring_cqe_seen(&ring, cqe);
goto err;
}
if (!i) {
if (!(cqe->flags & IORING_CQE_F_MORE)) {
fprintf(stderr, "IORING_CQE_F_MORE not set\n");
goto err;
}
} else {
if (cqe->flags & IORING_CQE_F_MORE) {
fprintf(stderr, "IORING_CQE_F_MORE set\n");
goto err;
}
}
io_uring_cqe_seen(&ring, cqe);
}
close(evfd);
io_uring_queue_exit(&ring);
return T_EXIT_PASS;
err:
close(evfd);
io_uring_queue_exit(&ring);
return T_EXIT_FAIL;
}
int main(int argc, char *argv[])
{
if (argc > 1)
return T_EXIT_SKIP;
return test();
}
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