libzmq/tests/test_poller.cpp

/* SPDX-License-Identifier: MPL-2.0 */

#include "testutil.hpp"
#include "testutil_unity.hpp"

#include <limits.h>

#ifndef _WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#endif

SETUP_TEARDOWN_TESTCONTEXT

fd_t get_fd (void *socket_)
{
    fd_t fd;
    size_t fd_size = sizeof fd;
    TEST_ASSERT_SUCCESS_ERRNO (zmq_getsockopt (socket_, ZMQ_FD, &fd, &fd_size));
    return fd;
}

void test_null_poller_pointers_destroy_direct ()
{
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_destroy (NULL));
}

void test_null_poller_pointers_destroy_indirect ()
{
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_destroy (&null_poller));
}

void test_null_poller_pointers_size_direct ()
{
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_size (NULL));
}

void test_null_poller_pointers_size_indirect ()
{
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_size (&null_poller));
}

void test_null_poller_pointers_add_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_add (NULL, socket, NULL, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_add_indirect ()
{
    void *null_poller = NULL;
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (
      EFAULT, zmq_poller_add (&null_poller, socket, NULL, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_modify_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_modify (NULL, socket, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_modify_indirect ()
{
    void *null_poller = NULL;
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (
      EFAULT, zmq_poller_modify (&null_poller, socket, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_remove_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_remove (NULL, socket));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_remove_indirect ()
{
    void *null_poller = NULL;
    void *socket = test_context_socket (ZMQ_PAIR);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_remove (&null_poller, socket));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_add_fd_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);

    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_add_fd (NULL, fd, NULL, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_add_fd_indirect ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (
      EFAULT, zmq_poller_add_fd (&null_poller, fd, NULL, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_modify_fd_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_modify_fd (NULL, fd, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_modify_fd_indirect ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (
      EFAULT, zmq_poller_modify_fd (&null_poller, fd, ZMQ_POLLIN));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_remove_fd_direct ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_remove_fd (NULL, fd));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_remove_fd_indirect ()
{
    void *socket = test_context_socket (ZMQ_PAIR);
    const fd_t fd = get_fd (socket);
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_remove_fd (&null_poller, fd));
    test_context_socket_close (socket);
}

void test_null_poller_pointers_wait_direct ()
{
    zmq_poller_event_t event;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_wait (NULL, &event, 0));
}

void test_null_poller_pointers_wait_indirect ()
{
    zmq_poller_event_t event;
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_wait (&null_poller, &event, 0));
}

void test_null_poller_pointers_wait_all_direct ()
{
    zmq_poller_event_t event;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_wait_all (NULL, &event, 1, 0));
}

void test_null_poller_pointers_wait_all_indirect ()
{
    zmq_poller_event_t event;
    void *null_poller = NULL;
    TEST_ASSERT_FAILURE_ERRNO (
      EFAULT, zmq_poller_wait_all (&null_poller, &event, 1, 0));
}

void test_null_poller_pointer_poller_fd ()
{
    void *null_poller = NULL;
    fd_t fd;
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_fd (&null_poller, &fd));
}

void test_null_socket_pointers ()
{
    void *poller = zmq_poller_new ();
    TEST_ASSERT_NOT_NULL (poller);

    TEST_ASSERT_FAILURE_ERRNO (ENOTSOCK,
                               zmq_poller_add (poller, NULL, NULL, ZMQ_POLLIN));

    TEST_ASSERT_FAILURE_ERRNO (ENOTSOCK,
                               zmq_poller_modify (poller, NULL, ZMQ_POLLIN));

    TEST_ASSERT_FAILURE_ERRNO (ENOTSOCK, zmq_poller_remove (poller, NULL));

    fd_t null_socket_fd = retired_fd;

    TEST_ASSERT_FAILURE_ERRNO (
      EBADF, zmq_poller_add_fd (poller, null_socket_fd, NULL, ZMQ_POLLIN));

    TEST_ASSERT_FAILURE_ERRNO (
      EBADF, zmq_poller_modify_fd (poller, null_socket_fd, ZMQ_POLLIN));

    TEST_ASSERT_FAILURE_ERRNO (EBADF,
                               zmq_poller_remove_fd (poller, null_socket_fd));

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));
}

typedef void (*extra_poller_socket_func_t) (void *poller_, void *socket_);

void test_with_empty_poller (extra_poller_socket_func_t extra_func_)
{
    void *socket = test_context_socket (ZMQ_PAIR);

    void *poller = zmq_poller_new ();
    TEST_ASSERT_NOT_NULL (poller);

    extra_func_ (poller, socket);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));

    test_context_socket_close (socket);
}

typedef void (*extra_poller_func_t) (void *poller_);

void test_with_valid_poller (extra_poller_func_t extra_func_)
{
    void *socket = test_context_socket (ZMQ_PAIR);

    void *poller = zmq_poller_new ();
    TEST_ASSERT_NOT_NULL (poller);

    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller, socket, NULL, ZMQ_POLLIN));

    extra_func_ (poller);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));

    test_context_socket_close (socket);
}

void test_call_poller_fd_no_signaler ()
{
    void *socket = test_context_socket (ZMQ_PAIR);

    void *poller = zmq_poller_new ();
    TEST_ASSERT_NOT_NULL (poller);

    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller, socket, NULL, ZMQ_POLLIN));

    fd_t fd;
    TEST_ASSERT_FAILURE_ERRNO (EINVAL, zmq_poller_fd (poller, &fd));

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));

    test_context_socket_close (socket);
}

void test_call_poller_fd ()
{
    void *socket = test_context_socket (ZMQ_CLIENT);

    void *poller = zmq_poller_new ();
    TEST_ASSERT_NOT_NULL (poller);

    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller, socket, NULL, ZMQ_POLLIN));

    fd_t fd;
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_fd (poller, &fd));

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));

    test_context_socket_close (socket);
}

void call_poller_wait_null_event_fails (void *poller_)
{
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_wait (poller_, NULL, 0));
}

void call_poller_wait_all_null_event_fails_event_count_nonzero (void *poller_)
{
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_wait_all (poller_, NULL, 1, 0));
}

void call_poller_wait_all_null_event_fails_event_count_zero (void *poller_)
{
    LIBZMQ_UNUSED (poller_);
#if 0
    //  TODO this causes an assertion, which is not consistent if the number
    //  of events may be 0, the pointer should be allowed to by NULL in that
    //  case too
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_wait_all (poller, NULL, 0, 0));
#endif
}

#define TEST_CASE_FUNC_PARAM(name, func)                                       \
    void test_##name ()                                                        \
    {                                                                          \
        func (name);                                                           \
    }

TEST_CASE_FUNC_PARAM (call_poller_wait_null_event_fails, test_with_valid_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_null_event_fails_event_count_nonzero,
                      test_with_valid_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_null_event_fails_event_count_zero,
                      test_with_valid_poller)

void call_poller_size (void *poller_, void *socket_)
{
    int rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 0);

    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller_, socket_, NULL, ZMQ_POLLIN));
    rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 1);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_modify (poller_, socket_, 0));
    rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 1);

    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add_fd (poller_, plain_socket, NULL, ZMQ_POLLOUT));
    rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 2);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove (poller_, socket_));
    rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 1);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove_fd (poller_, plain_socket));
    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
    rc = zmq_poller_size (poller_);
    TEST_ASSERT_SUCCESS_ERRNO (rc);
    TEST_ASSERT_EQUAL (rc, 0);
}

void call_poller_add_twice_fails (void *poller_, void *socket_)
{
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller_, socket_, NULL, ZMQ_POLLIN));

    //  attempt to add the same socket twice
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_add (poller_, socket_, NULL, ZMQ_POLLIN));

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove (poller_, socket_));
}

void call_poller_remove_unregistered_fails (void *poller_, void *socket_)
{
    //  attempt to remove socket that is not present
    TEST_ASSERT_FAILURE_ERRNO (EINVAL, zmq_poller_remove (poller_, socket_));
}

void call_poller_modify_unregistered_fails (void *poller_, void *socket_)
{
    //  attempt to modify socket that is not present
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_modify (poller_, socket_, ZMQ_POLLIN));
}

void call_poller_add_no_events (void *poller_, void *socket_)
{
    //  add a socket with no events initially (may be activated later with
    //  zmq_poller_modify)
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_add (poller_, socket_, NULL, 0));
    //  TODO test that no events are signalled
}

void call_poller_modify_no_events (void *poller_, void *socket_)
{
    //  deactivates all events for a socket temporarily (may be activated again
    //  later with zmq_poller_modify)
    zmq_poller_add (poller_, socket_, NULL, ZMQ_POLLIN);
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_modify (poller_, socket_, 0));
    //  TODO test that no events are signalled
}

void call_poller_add_fd_twice_fails (void *poller_, void * /*zeromq_socket*/)
{
    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add_fd (poller_, plain_socket, NULL, ZMQ_POLLIN));

    //  attempt to add the same plain socket twice
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_add_fd (poller_, plain_socket, NULL, ZMQ_POLLIN));

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove_fd (poller_, plain_socket));

    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
}

void call_poller_remove_fd_unregistered_fails (void *poller_,
                                               void * /*zeromq_socket*/)
{
    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);

    //  attempt to remove plain socket that is not present
    TEST_ASSERT_FAILURE_ERRNO (EINVAL,
                               zmq_poller_remove_fd (poller_, plain_socket));

    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
}

void call_poller_modify_fd_unregistered_fails (void *poller_,
                                               void * /*zeromq_socket*/)
{
    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);

    //  attempt to remove plain socket that is not present
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_modify_fd (poller_, plain_socket, ZMQ_POLLIN));

    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
}

void call_poller_add_invalid_events_fails (void *poller_, void *zeromq_socket_)
{
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_add (poller_, zeromq_socket_, NULL, SHRT_MAX));
}

void call_poller_modify_invalid_events_fails (void *poller_,
                                              void *zeromq_socket_)
{
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller_, zeromq_socket_, NULL, 0));

    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_modify (poller_, zeromq_socket_, SHRT_MAX));
}

void call_poller_add_fd_invalid_events_fails (void *poller_,
                                              void * /*zeromq_socket*/)
{
    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_add_fd (poller_, plain_socket, NULL, SHRT_MAX));

    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
}

void call_poller_modify_fd_invalid_events_fails (void *poller_,
                                                 void * /*zeromq_socket*/)
{
    fd_t plain_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add_fd (poller_, plain_socket, NULL, 0));
    TEST_ASSERT_FAILURE_ERRNO (
      EINVAL, zmq_poller_modify_fd (poller_, plain_socket, SHRT_MAX));

    TEST_ASSERT_SUCCESS_ERRNO (close (plain_socket));
}

TEST_CASE_FUNC_PARAM (call_poller_size, test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_add_twice_fails, test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_remove_unregistered_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_modify_unregistered_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_add_no_events, test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_modify_no_events, test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_add_fd_twice_fails, test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_remove_fd_unregistered_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_modify_fd_unregistered_fails,
                      test_with_empty_poller)

TEST_CASE_FUNC_PARAM (call_poller_add_invalid_events_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_modify_invalid_events_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_add_fd_invalid_events_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_modify_fd_invalid_events_fails,
                      test_with_empty_poller)

void call_poller_wait_empty_with_timeout_fails (void *poller_,
                                                void * /*socket*/)
{
    zmq_poller_event_t event;
    // waiting on poller with no registered sockets should report error
    TEST_ASSERT_FAILURE_ERRNO (EAGAIN, zmq_poller_wait (poller_, &event, 0));
}

void call_poller_wait_empty_without_timeout_fails (void *poller_,
                                                   void * /*socket*/)
{
    zmq_poller_event_t event;
    //  this would never be able to return since no socket was registered, and should yield an error
    TEST_ASSERT_FAILURE_ERRNO (EFAULT, zmq_poller_wait (poller_, &event, -1));
}

void call_poller_wait_all_empty_negative_count_fails (void *poller_,
                                                      void * /*socket*/)
{
    zmq_poller_event_t event;
    TEST_ASSERT_FAILURE_ERRNO (EINVAL,
                               zmq_poller_wait_all (poller_, &event, -1, 0));
}

void call_poller_wait_all_empty_without_timeout_fails (void *poller_,
                                                       void * /*socket*/)
{
    zmq_poller_event_t event;
    TEST_ASSERT_FAILURE_ERRNO (EAGAIN,
                               zmq_poller_wait_all (poller_, &event, 0, 0));
}

void call_poller_wait_all_empty_with_timeout_fails (void *poller_,
                                                    void * /*socket*/)
{
    zmq_poller_event_t event;
    //  this would never be able to return since no socket was registered, and should yield an error
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_wait_all (poller_, &event, 0, -1));
}

void call_poller_wait_all_inf_disabled_fails (void *poller_, void *socket_)
{
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_add (poller_, socket_, NULL, 0));

    zmq_poller_event_t events[1];
    TEST_ASSERT_FAILURE_ERRNO (EAGAIN,
                               zmq_poller_wait_all (poller_, events, 1, 0));
    TEST_ASSERT_FAILURE_ERRNO (EFAULT,
                               zmq_poller_wait_all (poller_, events, 1, -1));
}

TEST_CASE_FUNC_PARAM (call_poller_wait_empty_with_timeout_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_empty_without_timeout_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_empty_negative_count_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_empty_without_timeout_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_empty_with_timeout_fails,
                      test_with_empty_poller)
TEST_CASE_FUNC_PARAM (call_poller_wait_all_inf_disabled_fails,
                      test_with_empty_poller)

void test_poll_basic ()
{
    //  Create few sockets
    void *vent = test_context_socket (ZMQ_PUSH);

    size_t len = MAX_SOCKET_STRING;
    char my_endpoint[MAX_SOCKET_STRING];
    bind_loopback_ipv4 (vent, my_endpoint, len);

    void *sink = test_context_socket (ZMQ_PULL);
    TEST_ASSERT_SUCCESS_ERRNO (zmq_connect (sink, my_endpoint));

    //  Set up poller
    void *poller = zmq_poller_new ();

    // register sink
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_add (poller, sink, sink, ZMQ_POLLIN));

    //  Send a message
    const char *vent_sink_msg = "H";
    send_string_expect_success (vent, vent_sink_msg, 0);

    //  We expect a message only on the sink
    zmq_poller_event_t event;
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_wait (poller, &event, -1));
    TEST_ASSERT_EQUAL_PTR (sink, event.socket);
    TEST_ASSERT_EQUAL_PTR (sink, event.user_data);
    recv_string_expect_success (sink, vent_sink_msg, 0);

    //  We expect timed out
    TEST_ASSERT_FAILURE_ERRNO (EAGAIN, zmq_poller_wait (poller, &event, 0));

    //  Stop polling sink
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove (poller, sink));

    //  Clean up
    test_context_socket_close (vent);
    test_context_socket_close (sink);
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));
}

void test_poll_fd ()
{
    //  Create sockets
    void *vent = test_context_socket (ZMQ_PUSH);

    size_t len = MAX_SOCKET_STRING;
    char my_endpoint[MAX_SOCKET_STRING];
    bind_loopback_ipv4 (vent, my_endpoint, len);

    void *bowl = test_context_socket (ZMQ_PULL);
    TEST_ASSERT_SUCCESS_ERRNO (zmq_connect (bowl, my_endpoint));

    //  Set up poller
    void *poller = zmq_poller_new ();

    //  Check we can poll an FD
    const fd_t fd = get_fd (bowl);
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add_fd (poller, fd, bowl, ZMQ_POLLIN));

    zmq_poller_event_t event;
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_wait (poller, &event, 500));
    TEST_ASSERT_NULL (event.socket);
    TEST_ASSERT_EQUAL (fd, event.fd);
    TEST_ASSERT_EQUAL_PTR (bowl, event.user_data);
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove_fd (poller, fd));

    //  Clean up
    test_context_socket_close (vent);
    test_context_socket_close (bowl);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));
}

void test_poll_client_server ()
{
#if defined(ZMQ_SERVER) && defined(ZMQ_CLIENT)
    //  Create sockets
    void *server = test_context_socket (ZMQ_SERVER);

    size_t len = MAX_SOCKET_STRING;
    char my_endpoint[MAX_SOCKET_STRING];
    bind_loopback_ipv4 (server, my_endpoint, len);

    void *client = test_context_socket (ZMQ_CLIENT);

    //  Set up poller
    void *poller = zmq_poller_new ();

    //  Polling on thread safe sockets
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_add (poller, server, NULL, ZMQ_POLLIN));
    TEST_ASSERT_SUCCESS_ERRNO (zmq_connect (client, my_endpoint));

    const char *client_server_msg = "I";
    send_string_expect_success (client, client_server_msg, 0);

    zmq_poller_event_t event;
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_wait (poller, &event, 500));
    TEST_ASSERT_EQUAL_PTR (server, event.socket);
    TEST_ASSERT_NULL (event.user_data);
#ifndef _WIN32
    TEST_ASSERT (event.fd == -1);
#endif
    recv_string_expect_success (server, client_server_msg, 0);

    //  Polling on pollout
    TEST_ASSERT_SUCCESS_ERRNO (
      zmq_poller_modify (poller, server, ZMQ_POLLOUT | ZMQ_POLLIN));
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_wait (poller, &event, 0));
    TEST_ASSERT_EQUAL_PTR (server, event.socket);
    TEST_ASSERT_NULL (event.user_data);
#ifndef _WIN32
    TEST_ASSERT (event.fd == -1);
#endif
    TEST_ASSERT_EQUAL_INT (ZMQ_POLLOUT, event.events);

    //  Stop polling server
    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_remove (poller, server));

    //  Clean up
    test_context_socket_close (server);
    test_context_socket_close (client);

    TEST_ASSERT_SUCCESS_ERRNO (zmq_poller_destroy (&poller));
#endif
}

int main (void)
{
    setup_test_environment ();

    UNITY_BEGIN ();
    RUN_TEST (test_null_poller_pointers_destroy_direct);
    RUN_TEST (test_null_poller_pointers_destroy_indirect);
    RUN_TEST (test_null_poller_pointers_size_direct);
    RUN_TEST (test_null_poller_pointers_size_indirect);
    RUN_TEST (test_null_poller_pointers_add_direct);
    RUN_TEST (test_null_poller_pointers_add_indirect);
    RUN_TEST (test_null_poller_pointers_modify_direct);
    RUN_TEST (test_null_poller_pointers_modify_indirect);
    RUN_TEST (test_null_poller_pointers_remove_direct);
    RUN_TEST (test_null_poller_pointers_remove_indirect);
    RUN_TEST (test_null_poller_pointers_add_fd_direct);
    RUN_TEST (test_null_poller_pointers_add_fd_indirect);
    RUN_TEST (test_null_poller_pointers_modify_fd_direct);
    RUN_TEST (test_null_poller_pointers_modify_fd_indirect);
    RUN_TEST (test_null_poller_pointers_remove_fd_direct);
    RUN_TEST (test_null_poller_pointers_remove_fd_indirect);
    RUN_TEST (test_null_poller_pointers_wait_direct);
    RUN_TEST (test_null_poller_pointers_wait_indirect);
    RUN_TEST (test_null_poller_pointers_wait_all_direct);
    RUN_TEST (test_null_poller_pointers_wait_all_indirect);
    RUN_TEST (test_null_poller_pointer_poller_fd);

    RUN_TEST (test_null_socket_pointers);

    RUN_TEST (test_call_poller_wait_null_event_fails);
    RUN_TEST (test_call_poller_wait_all_null_event_fails_event_count_nonzero);
    RUN_TEST (test_call_poller_wait_all_null_event_fails_event_count_zero);

    RUN_TEST (test_call_poller_size);
    RUN_TEST (test_call_poller_add_twice_fails);
    RUN_TEST (test_call_poller_remove_unregistered_fails);
    RUN_TEST (test_call_poller_modify_unregistered_fails);
    RUN_TEST (test_call_poller_add_no_events);
    RUN_TEST (test_call_poller_modify_no_events);
    RUN_TEST (test_call_poller_add_fd_twice_fails);
    RUN_TEST (test_call_poller_remove_fd_unregistered_fails);
    RUN_TEST (test_call_poller_modify_fd_unregistered_fails);
    RUN_TEST (test_call_poller_add_invalid_events_fails);
    RUN_TEST (test_call_poller_modify_invalid_events_fails);
    RUN_TEST (test_call_poller_add_fd_invalid_events_fails);
    RUN_TEST (test_call_poller_modify_fd_invalid_events_fails);

    RUN_TEST (test_call_poller_wait_empty_with_timeout_fails);
    RUN_TEST (test_call_poller_wait_empty_without_timeout_fails);
    RUN_TEST (test_call_poller_wait_all_empty_negative_count_fails);
    RUN_TEST (test_call_poller_wait_all_empty_without_timeout_fails);
    RUN_TEST (test_call_poller_wait_all_empty_with_timeout_fails);
    RUN_TEST (test_call_poller_wait_all_inf_disabled_fails);

    RUN_TEST (test_call_poller_fd_no_signaler);
    RUN_TEST (test_call_poller_fd);

    RUN_TEST (test_poll_basic);
    RUN_TEST (test_poll_fd);
    RUN_TEST (test_poll_client_server);

    return UNITY_END ();
}