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#include "../config-host.h"
// SPDX-License-Identifier: MIT
/*
* Description: test AF_UNIX multishot handling of a send immediately
* followed by a shutdown of the socket, testing that neither
* of those events even if they both arrive before the kernel
* can react to the first one. Based on a reproducer from a
* bug report here:
*
* https://github.com/axboe/liburing/issues/1549
*/
#include <arpa/inet.h>
#include <sys/socket.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "liburing.h"
#include "helpers.h"
#define DUMMY_SEND_SIZE 123
#define BUF_COUNT 4
#define BUF_SIZE 256
#define BUF_GRP 0
#define ITERATIONS 10000
struct thread_data {
pthread_t thread;
pthread_barrier_t barrier;
int server_socket;
int client_socket;
int nr_sends;
int stop;
};
static bool use_af_inet;
static int received_bytes;
#define CHECK(x) do { \
if (!(x)) { \
fprintf(stderr, "Error: " #x "\n"); \
_exit(1); \
} \
} while (0)
static void *client_thread(void *arg)
{
static char buf[DUMMY_SEND_SIZE];
struct thread_data *td = arg;
int res;
while (!td->stop) {
int j;
pthread_barrier_wait(&td->barrier);
for (j = 0; j < td->nr_sends; j++) {
res = send(td->client_socket, buf, sizeof(buf), 0);
CHECK(res == sizeof(buf));
}
res = shutdown(td->client_socket, SHUT_WR);
CHECK(res == 0);
}
return NULL;
}
static void create_sockets(struct thread_data *td)
{
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = 0,
.sin_addr = { .s_addr = htonl(INADDR_LOOPBACK) },
};
socklen_t addr_len = sizeof(addr);
int listen_fd, res;
if (!use_af_inet) {
int sockets[2];
CHECK(socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == 0);
td->client_socket = sockets[0];
td->server_socket = sockets[1];
return;
}
listen_fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
CHECK(listen_fd > 0);
res = bind(listen_fd, (struct sockaddr *)&addr, sizeof(addr));
CHECK(res == 0);
res = getsockname(listen_fd, (struct sockaddr *)&addr, &addr_len);
CHECK(res == 0);
res = listen(listen_fd, 1);
CHECK(res == 0);
td->client_socket = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
CHECK(td->client_socket > 0);
res = connect(td->client_socket, (struct sockaddr *)&addr, sizeof(addr));
CHECK(res == 0);
td->server_socket = accept4(listen_fd, NULL, NULL, SOCK_CLOEXEC);
CHECK(td->server_socket > 0);
close(listen_fd);
}
static int last_received_bytes;
static void sig_alrm(int sig)
{
if (received_bytes == last_received_bytes) {
fprintf(stderr, "Seems stuck, exit\n");
exit(1);
}
last_received_bytes = received_bytes;
alarm(5);
}
int main(int argc, char *argv[])
{
static char buffer_bytes[BUF_COUNT * BUF_SIZE];
struct io_uring_buf_ring *ring;
struct sigaction act = { };
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring iouring;
struct thread_data td;
bool received_eof;
uint16_t buffer_id;
int err, i;
if (argc > 1)
return T_EXIT_SKIP;
act.sa_handler = sig_alrm;
act.sa_flags = SA_RESTART;
sigaction(SIGALRM, &act, NULL);
alarm(5);
use_af_inet = !!getenv("TEST_USE_INET");
CHECK(io_uring_queue_init(8, &iouring, 0) >= 0);
pthread_barrier_init(&td.barrier, NULL, 2);
td.stop = 0;
pthread_create(&td.thread, NULL, client_thread, &td);
pthread_detach(td.thread);
ring = io_uring_setup_buf_ring(&iouring, BUF_COUNT, BUF_GRP, 0, &err);
CHECK(err == 0);
for (i = 0; i < BUF_COUNT; i++) {
io_uring_buf_ring_add(ring, &buffer_bytes[BUF_SIZE * i],
BUF_SIZE, (uint16_t)i,
BUF_COUNT - 1, i);
}
io_uring_buf_ring_advance(ring, BUF_COUNT);
for (i = 0; i < ITERATIONS; i++) {
int expected_bytes;
td.nr_sends = (i & 1) + 1;
expected_bytes = td.nr_sends * DUMMY_SEND_SIZE;
create_sockets(&td);
sqe = io_uring_get_sqe(&iouring);
CHECK(sqe);
io_uring_prep_recv_multishot(sqe, td.server_socket, NULL, 0, 0);
sqe->flags |= IOSQE_BUFFER_SELECT;
sqe->buf_group = BUF_GRP;
io_uring_submit(&iouring);
pthread_barrier_wait(&td.barrier);
received_bytes = 0;
received_eof = false;
while (!received_eof) {
cqe = NULL;
do {
io_uring_wait_cqe(&iouring, &cqe);
} while (!cqe);
if (cqe->res > 0) {
CHECK(cqe->flags & IORING_CQE_F_MORE);
CHECK(cqe->flags & IORING_CQE_F_BUFFER);
buffer_id = cqe->flags >> 16;
io_uring_buf_ring_add(ring,
&buffer_bytes[BUF_SIZE * buffer_id],
BUF_SIZE, buffer_id,
BUF_COUNT - 1, buffer_id);
io_uring_buf_ring_advance(ring, 1);
received_bytes += cqe->res;
} else if (cqe->res == 0) {
CHECK(!received_eof);
received_eof = true;
CHECK(!(cqe->flags & IORING_CQE_F_MORE));
CHECK(!(cqe->flags & IORING_CQE_F_BUFFER));
} else {
CHECK(!"Unexpected recv");
}
io_uring_cqe_seen(&iouring, cqe);
}
CHECK(received_bytes == expected_bytes);
close(td.client_socket);
close(td.server_socket);
}
td.stop = 1;
return T_EXIT_PASS;
}
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