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/* SPDX-License-Identifier: MIT */
/*
* Test that we don't recursively generate completion events if an io_uring
* has an eventfd registered that triggers on completions, and we add a poll
* request with multishot on the eventfd. Older kernels will stop on overflow,
* newer kernels will detect this earlier and abort correctly.
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/eventfd.h>
#include <sys/types.h>
#include <poll.h>
#include <assert.h>
#include "liburing.h"
#include "helpers.h"
int main(int argc, char *argv[])
{
struct io_uring ring;
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int ret, efd, i;
if (argc > 1)
return T_EXIT_SKIP;
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "Ring init failed: %d\n", ret);
return T_EXIT_FAIL;
}
efd = eventfd(0, 0);
if (efd < 0) {
perror("eventfd");
return T_EXIT_FAIL;
}
ret = io_uring_register_eventfd(&ring, efd);
if (ret) {
fprintf(stderr, "Ring eventfd register failed: %d\n", ret);
return T_EXIT_FAIL;
}
sqe = io_uring_get_sqe(&ring);
io_uring_prep_poll_multishot(sqe, efd, POLLIN);
sqe->user_data = 1;
io_uring_submit(&ring);
sqe = io_uring_get_sqe(&ring);
sqe->user_data = 2;
io_uring_prep_nop(sqe);
io_uring_submit(&ring);
for (i = 0; i < 2; i++) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe ret = %d\n", ret);
break;
}
io_uring_cqe_seen(&ring, cqe);
}
ret = io_uring_peek_cqe(&ring, &cqe);
if (!ret) {
fprintf(stderr, "Generated too many events\n");
return T_EXIT_FAIL;
}
return T_EXIT_PASS;
}
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