nuttx-apps/examples/usrsocktest/usrsocktest_noblock_connect.c

/****************************************************************************
 * apps/examples/usrsocktest/usrsocktest_noblock_connect.c
 * Socket connect tests in non-blocking mode
 *
 *   Copyright (C) 2015, 2017 Haltian Ltd. All rights reserved.
 *   Authors: Roman Saveljev <roman.saveljev@haltian.com>
 *            Jussi Kivilinna <jussi.kivilinna@haltian.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <sys/socket.h>
#include <errno.h>
#include <sys/types.h>
#include <stdbool.h>
#include <assert.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "defines.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

static bool started;
static int sd;
static int sd2;

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

TEST_SETUP(no_block_connect)
{
  sd = -1;
  sd2 = -1;
  started = false;
}

TEST_TEAR_DOWN(no_block_connect)
{
  int ret;

  if (sd >= 0)
    {
      ret = close(sd);
      assert(ret == 0);
    }

  if (sd2 >= 0)
    {
      ret = close(sd2);
      assert(ret == 0);
    }

  if (started)
    {
      ret = usrsocktest_daemon_stop();
      assert(ret == OK);
    }
}

TEST(no_block_connect, instant_connect)
{
  int flags;
  int ret;
  struct sockaddr_in addr;

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open socket */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Do connect, should succeed instantly. */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(0, ret);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Close socket */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);
}

TEST(no_block_connect, delayed_connect)
{
  int flags;
  int ret;
  int count;
  struct sockaddr_in addr;

  /* Start test daemon. */

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_block_connect = true;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  usrsocktest_daemon_config.delay_all_responses = true;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open socket */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempt, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Another connect attempt results EALREADY. */

  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EALREADY, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connect. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0;
       usrsocktest_daemon_get_num_waiting_connect_sockets() > 0; count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Another connect attempt results EISCONN. */

  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EISCONN, errno);

  /* Close socket. */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);
}

TEST(no_block_connect, close_not_connected)
{
  int flags;
  int ret;
  struct sockaddr_in addr;

  /* Start test daemon. */

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_block_connect = true;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  usrsocktest_daemon_config.delay_all_responses = true;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open socket */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempt, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Close socket. */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);
}

TEST(no_block_connect, early_drop)
{
  int flags;
  int ret;
  struct sockaddr_in addr;

  /* Start test daemon. */

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_block_connect = true;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  usrsocktest_daemon_config.delay_all_responses = false;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open socket */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempt, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);

  /* Close socket. */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
}

TEST(no_block_connect, multiple)
{
  int flags;
  int ret;
  int count;
  struct sockaddr_in addr;

  /* Start test daemon. */

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_block_connect = true;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  usrsocktest_daemon_config.delay_all_responses = false;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open sockets */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());
  sd2 = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd2 >= 0);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd2, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempts, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd2, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connections. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0;
       usrsocktest_daemon_get_num_waiting_connect_sockets() > 0; count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd2, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EISCONN, errno);

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connections. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0; usrsocktest_daemon_get_num_waiting_connect_sockets() > 0;
       count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Close sockets. */

  TEST_ASSERT_TRUE(close(sd2) >= 0);
  sd2 = -1;
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Open sockets */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());
  sd2 = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd2 >= 0);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd2, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempts, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  ret = connect(sd2, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connections. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0;
       usrsocktest_daemon_get_num_waiting_connect_sockets() > 0; count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Close sockets. */

  TEST_ASSERT_TRUE(close(sd2) >= 0);
  sd2 = -1;
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Open sockets */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());
  sd2 = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd2 >= 0);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd2, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd2, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempt, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connections. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0;
       usrsocktest_daemon_get_num_waiting_connect_sockets() > 0; count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Launch another connect attempt, daemon delays actual connection until
   * triggered.
   */

  ret = connect(sd2, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(2, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Close sockets. */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_TRUE(close(sd2) >= 0);
  sd2 = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);
}

TEST(no_block_connect, basic_daemon_dup2)
{
  int flags;
  int ret;
  int count;
  struct sockaddr_in addr;

  /* Start test daemon. */

  usrsocktest_daemon_config = usrsocktest_daemon_defconf;
  usrsocktest_daemon_config.endpoint_block_connect = true;
  usrsocktest_daemon_config.endpoint_addr = "127.0.0.1";
  usrsocktest_daemon_config.endpoint_port = 255;
  usrsocktest_daemon_config.delay_all_responses = true;
  TEST_ASSERT_EQUAL(OK,
                    usrsocktest_daemon_start(&usrsocktest_daemon_config));
  started = true;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());

  /* Open socket */

  sd = socket(AF_INET, SOCK_STREAM, 0);
  TEST_ASSERT_TRUE(sd >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Duplicate socket */

  sd2 = dup(sd);
  TEST_ASSERT_TRUE(sd2 >= 0);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());

  /* Make socket non-blocking */

  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(0, flags & O_NONBLOCK);
  ret = fcntl(sd, F_SETFL, flags | O_NONBLOCK);
  TEST_ASSERT_EQUAL(0, ret);
  flags = fcntl(sd, F_GETFL, 0);
  TEST_ASSERT_TRUE(flags >= 0);
  TEST_ASSERT_EQUAL(O_RDWR, flags & O_RDWR);
  TEST_ASSERT_EQUAL(O_NONBLOCK, flags & O_NONBLOCK);

  /* Launch connect attempt, daemon delays actual connection until
   * triggered.
   */

  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_family = AF_INET;
  addr.sin_port = htons(255);
  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EINPROGRESS, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Another connect attempt results EALREADY. */

  ret = connect(sd2, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EALREADY, errno);
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Release delayed connect. */

  TEST_ASSERT_TRUE(usrsocktest_daemon_establish_waiting_connections());
  for (count = 0;
       usrsocktest_daemon_get_num_waiting_connect_sockets() > 0; count++)
    {
      TEST_ASSERT_TRUE(count <= 5);
      usleep(10 * 1000);
    }

  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Another connect attempt results EISCONN. */

  ret = connect(sd, (FAR const struct sockaddr *)&addr, sizeof(addr));
  TEST_ASSERT_EQUAL(-1, ret);
  TEST_ASSERT_EQUAL(EISCONN, errno);

  /* Close sockets. */

  TEST_ASSERT_TRUE(close(sd) >= 0);
  sd = -1;
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(1, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  TEST_ASSERT_TRUE(close(sd2) >= 0);
  sd2 = -1;
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_daemon_get_num_waiting_connect_sockets());

  /* Stopping daemon should succeed. */

  TEST_ASSERT_EQUAL(OK, usrsocktest_daemon_stop());
  started = false;
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_active_sockets());
  TEST_ASSERT_EQUAL(-ENODEV, usrsocktest_daemon_get_num_connected_sockets());
  TEST_ASSERT_EQUAL(-ENODEV,
                    usrsocktest_daemon_get_num_waiting_connect_sockets());
  TEST_ASSERT_EQUAL(0, usrsocktest_endp_malloc_cnt);
  TEST_ASSERT_EQUAL(0, usrsocktest_dcmd_malloc_cnt);
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

TEST_GROUP(no_block_connect)
{
  RUN_TEST_CASE(no_block_connect, instant_connect);
  RUN_TEST_CASE(no_block_connect, delayed_connect);
  RUN_TEST_CASE(no_block_connect, close_not_connected);
  RUN_TEST_CASE(no_block_connect, early_drop);
  RUN_TEST_CASE(no_block_connect, multiple);
  RUN_TEST_CASE(no_block_connect, basic_daemon_dup2);
}