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/* SPDX-License-Identifier: MIT */
/*
* Description: test many files being polled for
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <poll.h>
#include <sys/resource.h>
#include <fcntl.h>
#include "liburing.h"
#define NFILES 5000
#define BATCH 500
#define NLOOPS 1000
#define RING_SIZE 512
struct p {
int fd[2];
int triggered;
};
static struct p p[NFILES];
static int arm_poll(struct io_uring *ring, int off)
{
struct io_uring_sqe *sqe;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "failed getting sqe\n");
return 1;
}
io_uring_prep_poll_add(sqe, p[off].fd[0], POLLIN);
sqe->user_data = off;
return 0;
}
static int reap_polls(struct io_uring *ring)
{
struct io_uring_cqe *cqe;
int i, ret, off;
char c;
for (i = 0; i < BATCH; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret) {
fprintf(stderr, "wait cqe %d\n", ret);
return ret;
}
off = cqe->user_data;
p[off].triggered = 0;
ret = read(p[off].fd[0], &c, 1);
if (ret != 1) {
fprintf(stderr, "read got %d/%d\n", ret, errno);
break;
}
if (arm_poll(ring, off))
break;
io_uring_cqe_seen(ring, cqe);
}
if (i != BATCH) {
fprintf(stderr, "gave up at %d\n", i);
return 1;
}
ret = io_uring_submit(ring);
if (ret != BATCH) {
fprintf(stderr, "submitted %d, %d\n", ret, BATCH);
return 1;
}
return 0;
}
static int trigger_polls(void)
{
char c = 89;
int i, ret;
for (i = 0; i < BATCH; i++) {
int off;
do {
off = rand() % NFILES;
if (!p[off].triggered)
break;
} while (1);
p[off].triggered = 1;
ret = write(p[off].fd[1], &c, 1);
if (ret != 1) {
fprintf(stderr, "write got %d/%d\n", ret, errno);
return 1;
}
}
return 0;
}
static int arm_polls(struct io_uring *ring)
{
int ret, to_arm = NFILES, i, off;
off = 0;
while (to_arm) {
int this_arm;
this_arm = to_arm;
if (this_arm > RING_SIZE)
this_arm = RING_SIZE;
for (i = 0; i < this_arm; i++) {
if (arm_poll(ring, off)) {
fprintf(stderr, "arm failed at %d\n", off);
return 1;
}
off++;
}
ret = io_uring_submit(ring);
if (ret != this_arm) {
fprintf(stderr, "submitted %d, %d\n", ret, this_arm);
return 1;
}
to_arm -= this_arm;
}
return 0;
}
int main(int argc, char *argv[])
{
struct io_uring ring;
struct io_uring_params params = { };
struct rlimit rlim;
int i, ret;
if (argc > 1)
return 0;
if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
perror("getrlimit");
goto err_noring;
}
if (rlim.rlim_cur < (2 * NFILES + 5)) {
rlim.rlim_cur = (2 * NFILES + 5);
rlim.rlim_max = rlim.rlim_cur;
if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
if (errno == EPERM)
goto err_nofail;
perror("setrlimit");
goto err_noring;
}
}
for (i = 0; i < NFILES; i++) {
if (pipe(p[i].fd) < 0) {
perror("pipe");
goto err_noring;
}
}
params.flags = IORING_SETUP_CQSIZE;
params.cq_entries = 4096;
ret = io_uring_queue_init_params(RING_SIZE, &ring, ¶ms);
if (ret) {
if (ret == -EINVAL) {
fprintf(stdout, "No CQSIZE, trying without\n");
ret = io_uring_queue_init(RING_SIZE, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
}
}
if (arm_polls(&ring))
goto err;
for (i = 0; i < NLOOPS; i++) {
trigger_polls();
ret = reap_polls(&ring);
if (ret)
goto err;
}
io_uring_queue_exit(&ring);
return 0;
err:
io_uring_queue_exit(&ring);
err_noring:
fprintf(stderr, "poll-many failed\n");
return 1;
err_nofail:
fprintf(stderr, "poll-many: not enough files available (and not root), "
"skipped\n");
return 0;
}
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