text: // Copyright 2018 Open Source Robotics Foundation, Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #ifdef __cplusplus
  extern "C"
  {
  #endif
  
  #include "rcl_action/action_client.h"
  
  #include "rcl_action/default_qos.h"
  #include "rcl_action/names.h"
  #include "rcl_action/types.h"
  #include "rcl_action/wait.h"
  
  #include "rcl/client.h"
  #include "rcl/error_handling.h"
  #include "rcl/graph.h"
  #include "rcl/subscription.h"
  #include "rcl/types.h"
  #include "rcl/wait.h"
  
  #include "rcutils/logging_macros.h"
  #include "rcutils/strdup.h"
  
  #include "rmw/qos_profiles.h"
  #include "rmw/types.h"
  
  
  typedef struct rcl_action_client_impl_t
  {
    rcl_client_t goal_client;
    rcl_client_t cancel_client;
    rcl_client_t result_client;
    rcl_subscription_t feedback_subscription;
    rcl_subscription_t status_subscription;
    rcl_action_client_options_t options;
    char * action_name;
    // Wait set records
    size_t wait_set_goal_client_index;
    size_t wait_set_cancel_client_index;
    size_t wait_set_result_client_index;
    size_t wait_set_feedback_subscription_index;
    size_t wait_set_status_subscription_index;
  } rcl_action_client_impl_t;
  
  rcl_action_client_t
  rcl_action_get_zero_initialized_client(void)
  {
    static rcl_action_client_t null_action_client = {0};
    return null_action_client;
  }
  
  // \internal Initializes an action client specific service client.
  #define CLIENT_INIT(Type) \
    char * Type ## _service_name = NULL; \
    ret = rcl_action_get_ ## Type ## _service_name(action_name, allocator, &Type ## _service_name); \
    if (RCL_RET_OK != ret) { \
      RCL_SET_ERROR_MSG("failed to get " #Type " service name"); \
      if (RCL_RET_BAD_ALLOC == ret) { \
        ret = RCL_RET_BAD_ALLOC; \
      } else { \
        ret = RCL_RET_ERROR; \
      } \
      goto fail; \
    } \
    rcl_client_options_t Type ## _service_client_options = { \
      .qos = options->Type ## _service_qos, .allocator = allocator \
    }; \
    action_client->impl->Type ## _client = rcl_get_zero_initialized_client(); \
    ret = rcl_client_init( \
      &action_client->impl->Type ## _client, \
      node, \
      type_support->Type ## _service_type_support, \
      Type ## _service_name, \
      &Type ## _service_client_options); \
    allocator.deallocate(Type ## _service_name, allocator.state); \
    if (RCL_RET_OK != ret) { \
      if (RCL_RET_BAD_ALLOC == ret) { \
        ret = RCL_RET_BAD_ALLOC; \
      } else if (RCL_RET_SERVICE_NAME_INVALID == ret) { \
        ret = RCL_RET_ACTION_NAME_INVALID; \
      } else { \
        ret = RCL_RET_ERROR; \
      } \
      goto fail; \
    }
  
  // \internal Initializes an action client specific topic subscription.
  #define SUBSCRIPTION_INIT(Type) \
    char * Type ## _topic_name = NULL; \
    ret = rcl_action_get_ ## Type ## _topic_name(action_name, allocator, &Type ## _topic_name); \
    if (RCL_RET_OK != ret) { \
      RCL_SET_ERROR_MSG("failed to get " #Type " topic name"); \
      if (RCL_RET_BAD_ALLOC == ret) { \
        ret = RCL_RET_BAD_ALLOC; \
      } else { \
        ret = RCL_RET_ERROR; \
      } \
      goto fail; \
    } \
    rcl_subscription_options_t Type ## _topic_subscription_options = \
      rcl_subscription_get_default_options(); \
    Type ## _topic_subscription_options.qos = options->Type ## _topic_qos; \
    Type ## _topic_subscription_options.allocator = allocator; \
    action_client->impl->Type ## _subscription = rcl_get_zero_initialized_subscription(); \
    ret = rcl_subscription_init( \
      &action_client->impl->Type ## _subscription, \
      node, \
      type_support->Type ## _message_type_support, \
      Type ## _topic_name, \
      &Type ## _topic_subscription_options); \
    allocator.deallocate(Type ## _topic_name, allocator.state); \
    if (RCL_RET_OK != ret) { \
      if (RCL_RET_BAD_ALLOC == ret) { \
        ret = RCL_RET_BAD_ALLOC; \
      } else if (RCL_RET_TOPIC_NAME_INVALID == ret) { \
        ret = RCL_RET_ACTION_NAME_INVALID; \
      } else { \
        ret = RCL_RET_ERROR; \
      } \
      goto fail; \
    }
  
  rcl_ret_t
  rcl_action_client_init(
    rcl_action_client_t * action_client,
    rcl_node_t * node,
    const rosidl_action_type_support_t * type_support,
    const char * action_name,
    const rcl_action_client_options_t * options)
  {
    RCL_CHECK_ARGUMENT_FOR_NULL(action_client, RCL_RET_INVALID_ARGUMENT);
    if (!rcl_node_is_valid(node)) {
      return RCL_RET_NODE_INVALID;
    }
    RCL_CHECK_ARGUMENT_FOR_NULL(type_support, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(action_name, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(options, RCL_RET_INVALID_ARGUMENT);
    rcl_allocator_t allocator = options->allocator;
    RCL_CHECK_ALLOCATOR_WITH_MSG(&allocator, "invalid allocator", return RCL_RET_INVALID_ARGUMENT);
  
    rcl_ret_t ret = RCL_RET_OK;
    rcl_ret_t fini_ret = RCL_RET_OK;
    RCUTILS_LOG_DEBUG_NAMED(
      ROS_PACKAGE_NAME, "Initializing client for action name '%s'", action_name);
    if (NULL != action_client->impl) {
      RCL_SET_ERROR_MSG("action client already initialized, or memory was uninitialized");
      return RCL_RET_ALREADY_INIT;
    }
    // Allocate space for the implementation struct.
    action_client->impl = allocator.allocate(sizeof(rcl_action_client_impl_t), allocator.state);
    RCL_CHECK_FOR_NULL_WITH_MSG(
      action_client->impl, "allocating memory failed", return RCL_RET_BAD_ALLOC);
  
    // Copy action client name and options.
    action_client->impl->action_name = rcutils_strdup(action_name, allocator);
    if (NULL == action_client->impl->action_name) {
      ret = RCL_RET_BAD_ALLOC;
      goto fail;
    }
    action_client->impl->options = *options;
  
    // Initialize action service clients.
    CLIENT_INIT(goal);
    CLIENT_INIT(cancel);
    CLIENT_INIT(result);
  
    // Initialize action topic subscriptions.
    SUBSCRIPTION_INIT(feedback);
    SUBSCRIPTION_INIT(status);
  
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Action client initialized");
    return ret;
  fail:
    fini_ret = rcl_action_client_fini(action_client, node);
    if (RCL_RET_OK != fini_ret) {
      RCL_SET_ERROR_MSG("failed to cleanup action client");
      ret = RCL_RET_ERROR;
    }
    return ret;
  }
  
  rcl_ret_t
  rcl_action_client_fini(rcl_action_client_t * action_client, rcl_node_t * node)
  {
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Finalizing action client");
    if (!rcl_action_client_is_valid(action_client)) {
      return RCL_RET_ACTION_CLIENT_INVALID;  // error already set
    }
    if (!rcl_node_is_valid_except_context(node)) {
      return RCL_RET_NODE_INVALID;  // error already set
    }
    rcl_ret_t ret = RCL_RET_OK;
    if (RCL_RET_OK != rcl_client_fini(&action_client->impl->goal_client, node)) {
      ret = RCL_RET_ERROR;
    }
    if (RCL_RET_OK != rcl_client_fini(&action_client->impl->cancel_client, node)) {
      ret = RCL_RET_ERROR;
    }
    if (RCL_RET_OK != rcl_client_fini(&action_client->impl->result_client, node)) {
      ret = RCL_RET_ERROR;
    }
    if (RCL_RET_OK != rcl_subscription_fini(&action_client->impl->feedback_subscription, node)) {
      ret = RCL_RET_ERROR;
    }
    if (RCL_RET_OK != rcl_subscription_fini(&action_client->impl->status_subscription, node)) {
      ret = RCL_RET_ERROR;
    }
    rcl_allocator_t * allocator = &action_client->impl->options.allocator;
    allocator->deallocate(action_client->impl->action_name, allocator->state);
    allocator->deallocate(action_client->impl, allocator->state);
    action_client->impl = NULL;
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Action client finalized");
    return ret;
  }
  
  rcl_action_client_options_t
  rcl_action_client_get_default_options(void)
  {
    static rcl_action_client_options_t default_options;
    default_options.goal_service_qos = rmw_qos_profile_services_default;
    default_options.cancel_service_qos = rmw_qos_profile_services_default;
    default_options.result_service_qos = rmw_qos_profile_services_default;
    default_options.feedback_topic_qos = rmw_qos_profile_default;
    default_options.status_topic_qos = rcl_action_qos_profile_status_default;
    default_options.allocator = rcl_get_default_allocator();
    return default_options;
  }
  
  rcl_ret_t
  rcl_action_server_is_available(
    const rcl_node_t * node,
    const rcl_action_client_t * client,
    bool * is_available)
  {
    if (!rcl_node_is_valid(node)) {
      return RCL_RET_NODE_INVALID;  // error is already set
    }
    if (!rcl_action_client_is_valid(client)) {
      return RCL_RET_ACTION_CLIENT_INVALID;  // error is already set
    }
    RCL_CHECK_ARGUMENT_FOR_NULL(is_available, RCL_RET_INVALID_ARGUMENT);
  
    bool temp;
    rcl_ret_t ret;
    *is_available = true;
  
    ret = rcl_service_server_is_available(node, &(client->impl->goal_client), &temp);
    if (RCL_RET_OK != ret) {
      return ret;  // error is already set
    }
    *is_available = (*is_available && temp);
  
    ret = rcl_service_server_is_available(node, &(client->impl->cancel_client), &temp);
    if (RCL_RET_OK != ret) {
      return ret;  // error is already set
    }
    *is_available = (*is_available && temp);
  
    ret = rcl_service_server_is_available(node, &(client->impl->result_client), &temp);
    if (RCL_RET_OK != ret) {
      return ret;  // error is already set
    }
    *is_available = (*is_available && temp);
  
    size_t number_of_publishers;
  
    ret = rcl_subscription_get_publisher_count(
      &(client->impl->feedback_subscription), &number_of_publishers);
    if (RCL_RET_OK != ret) {
      return ret;  // error is already set
    }
    *is_available = *is_available && (number_of_publishers != 0);
  
    return RCL_RET_OK;
  }
  
  // \internal Sends an action client specific service request.
  #define SEND_SERVICE_REQUEST(Type, request, sequence_number) \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Sending action " #Type " request"); \
    if (!rcl_action_client_is_valid(action_client)) { \
      return RCL_RET_ACTION_CLIENT_INVALID;  /* error already set */ \
    } \
    RCL_CHECK_ARGUMENT_FOR_NULL(request, RCL_RET_INVALID_ARGUMENT); \
    RCL_CHECK_ARGUMENT_FOR_NULL(sequence_number, RCL_RET_INVALID_ARGUMENT); \
    rcl_ret_t ret = rcl_send_request( \
      &action_client->impl->Type ## _client, request, sequence_number); \
    if (RCL_RET_OK != ret) { \
      return RCL_RET_ERROR;  /* error already set */ \
    } \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Action " #Type " request sent"); \
    return RCL_RET_OK;
  
  // \internal Takes an action client specific service response.
  #define TAKE_SERVICE_RESPONSE(Type, response_header, response) \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Taking action " #Type " response"); \
    if (!rcl_action_client_is_valid(action_client)) { \
      return RCL_RET_ACTION_CLIENT_INVALID;  /* error already set */ \
    } \
    RCL_CHECK_ARGUMENT_FOR_NULL(response_header, RCL_RET_INVALID_ARGUMENT); \
    RCL_CHECK_ARGUMENT_FOR_NULL(response, RCL_RET_INVALID_ARGUMENT); \
    rcl_ret_t ret = rcl_take_response( \
      &action_client->impl->Type ## _client, response_header, response); \
    if (RCL_RET_OK != ret) { \
      if (RCL_RET_BAD_ALLOC == ret) { \
        return RCL_RET_BAD_ALLOC;  /* error already set */ \
      } \
      if (RCL_RET_CLIENT_TAKE_FAILED == ret) { \
        return RCL_RET_ACTION_CLIENT_TAKE_FAILED; \
      } \
      return RCL_RET_ERROR;  /* error already set */ \
    } \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Action " #Type " response taken"); \
    return RCL_RET_OK;
  
  
  rcl_ret_t
  rcl_action_send_goal_request(
    const rcl_action_client_t * action_client,
    const void * ros_goal_request,
    int64_t * sequence_number)
  {
    SEND_SERVICE_REQUEST(goal, ros_goal_request, sequence_number);
  }
  
  rcl_ret_t
  rcl_action_take_goal_response(
    const rcl_action_client_t * action_client,
    rmw_request_id_t * response_header,
    void * ros_goal_response)
  {
    TAKE_SERVICE_RESPONSE(goal, response_header, ros_goal_response);
  }
  
  rcl_ret_t
  rcl_action_send_result_request(
    const rcl_action_client_t * action_client,
    const void * ros_result_request,
    int64_t * sequence_number)
  {
    SEND_SERVICE_REQUEST(result, ros_result_request, sequence_number);
  }
  
  rcl_ret_t
  rcl_action_take_result_response(
    const rcl_action_client_t * action_client,
    rmw_request_id_t * response_header,
    void * ros_result_response)
  {
    TAKE_SERVICE_RESPONSE(result, response_header, ros_result_response);
  }
  
  rcl_ret_t
  rcl_action_send_cancel_request(
    const rcl_action_client_t * action_client,
    const void * ros_cancel_request,
    int64_t * sequence_number)
  {
    SEND_SERVICE_REQUEST(cancel, ros_cancel_request, sequence_number);
  }
  
  rcl_ret_t
  rcl_action_take_cancel_response(
    const rcl_action_client_t * action_client,
    rmw_request_id_t * response_header,
    void * ros_cancel_response)
  {
    TAKE_SERVICE_RESPONSE(cancel, response_header, ros_cancel_response);
  }
  
  // \internal Takes an action client specific topic message.
  #define TAKE_MESSAGE(Type) \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Taking action " #Type); \
    if (!rcl_action_client_is_valid(action_client)) { \
      return RCL_RET_ACTION_CLIENT_INVALID;  /* error already set */ \
    } \
    RCL_CHECK_ARGUMENT_FOR_NULL(ros_ ## Type, RCL_RET_INVALID_ARGUMENT); \
    rmw_message_info_t message_info; /* ignored */ \
    rcl_ret_t ret = rcl_take( \
      &action_client->impl->Type ## _subscription, ros_ ## Type, &message_info, NULL); \
    if (RCL_RET_OK != ret) { \
      if (RCL_RET_SUBSCRIPTION_TAKE_FAILED == ret) { \
        return RCL_RET_ACTION_CLIENT_TAKE_FAILED; \
      } \
      if (RCL_RET_BAD_ALLOC == ret) { \
        return RCL_RET_BAD_ALLOC; \
      } \
      return RCL_RET_ERROR; \
    } \
    RCUTILS_LOG_DEBUG_NAMED(ROS_PACKAGE_NAME, "Action " #Type " taken"); \
    return RCL_RET_OK;
  
  rcl_ret_t
  rcl_action_take_feedback(
    const rcl_action_client_t * action_client,
    void * ros_feedback)
  {
    TAKE_MESSAGE(feedback);
  }
  
  rcl_ret_t
  rcl_action_take_status(
    const rcl_action_client_t * action_client,
    void * ros_status)
  {
    TAKE_MESSAGE(status);
  }
  
  const char *
  rcl_action_client_get_action_name(const rcl_action_client_t * action_client)
  {
    if (!rcl_action_client_is_valid(action_client)) {
      return NULL;
    }
    return action_client->impl->action_name;
  }
  
  const rcl_action_client_options_t *
  rcl_action_client_get_options(const rcl_action_client_t * action_client)
  {
    if (!rcl_action_client_is_valid(action_client)) {
      return NULL;
    }
    return &action_client->impl->options;
  }
  
  bool
  rcl_action_client_is_valid(const rcl_action_client_t * action_client)
  {
    RCL_CHECK_FOR_NULL_WITH_MSG(
      action_client, "action client pointer is invalid", return false);
    RCL_CHECK_FOR_NULL_WITH_MSG(
      action_client->impl, "action client implementation is invalid", return false);
    if (!rcl_client_is_valid(&action_client->impl->goal_client)) {
      rcl_reset_error();
      RCL_SET_ERROR_MSG("goal client is invalid");
      return false;
    }
    if (!rcl_client_is_valid(&action_client->impl->cancel_client)) {
      rcl_reset_error();
      RCL_SET_ERROR_MSG("cancel client is invalid");
      return false;
    }
    if (!rcl_client_is_valid(&action_client->impl->result_client)) {
      rcl_reset_error();
      RCL_SET_ERROR_MSG("result client is invalid");
      return false;
    }
    if (!rcl_subscription_is_valid(&action_client->impl->feedback_subscription)) {
      rcl_reset_error();
      RCL_SET_ERROR_MSG("feedback subscription is invalid");
      return false;
    }
    if (!rcl_subscription_is_valid(&action_client->impl->status_subscription)) {
      rcl_reset_error();
      RCL_SET_ERROR_MSG("status subscription is invalid");
      return false;
    }
    return true;
  }
  
  rcl_ret_t
  rcl_action_wait_set_add_action_client(
    rcl_wait_set_t * wait_set,
    const rcl_action_client_t * action_client,
    size_t * client_index,
    size_t * subscription_index)
  {
    rcl_ret_t ret;
    RCL_CHECK_ARGUMENT_FOR_NULL(wait_set, RCL_RET_WAIT_SET_INVALID);
    if (!rcl_action_client_is_valid(action_client)) {
      return RCL_RET_ACTION_CLIENT_INVALID;  // error already set
    }
  
    // Wait on action goal service response messages.
    ret = rcl_wait_set_add_client(
      wait_set,
      &action_client->impl->goal_client,
      &action_client->impl->wait_set_goal_client_index);
    if (RCL_RET_OK != ret) {
      return ret;
    }
    // Wait on action cancel service response messages.
    ret = rcl_wait_set_add_client(
      wait_set,
      &action_client->impl->cancel_client,
      &action_client->impl->wait_set_cancel_client_index);
    if (RCL_RET_OK != ret) {
      return ret;
    }
    // Wait on action result service response messages.
    ret = rcl_wait_set_add_client(
      wait_set,
      &action_client->impl->result_client,
      &action_client->impl->wait_set_result_client_index);
    if (RCL_RET_OK != ret) {
      return ret;
    }
    // Wait on action feedback messages.
    ret = rcl_wait_set_add_subscription(
      wait_set,
      &action_client->impl->feedback_subscription,
      &action_client->impl->wait_set_feedback_subscription_index);
    if (RCL_RET_OK != ret) {
      return ret;
    }
    // Wait on action status messages.
    ret = rcl_wait_set_add_subscription(
      wait_set,
      &action_client->impl->status_subscription,
      &action_client->impl->wait_set_status_subscription_index);
    if (RCL_RET_OK != ret) {
      return ret;
    }
  
    if (NULL != client_index) {
      // The goal client was the first added
      *client_index = action_client->impl->wait_set_goal_client_index;
    }
    if (NULL != subscription_index) {
      // The feedback subscription was the first added
      *subscription_index = action_client->impl->wait_set_feedback_subscription_index;
    }
    return RCL_RET_OK;
  }
  
  rcl_ret_t
  rcl_action_client_wait_set_get_num_entities(
    const rcl_action_client_t * action_client,
    size_t * num_subscriptions,
    size_t * num_guard_conditions,
    size_t * num_timers,
    size_t * num_clients,
    size_t * num_services)
  {
    if (!rcl_action_client_is_valid(action_client)) {
      return RCL_RET_ACTION_CLIENT_INVALID;  // error already set
    }
    RCL_CHECK_ARGUMENT_FOR_NULL(num_subscriptions, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(num_guard_conditions, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(num_timers, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(num_clients, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(num_services, RCL_RET_INVALID_ARGUMENT);
    *num_subscriptions = 2;
    *num_guard_conditions = 0;
    *num_timers = 0;
    *num_clients = 3;
    *num_services = 0;
    return RCL_RET_OK;
  }
  
  rcl_ret_t
  rcl_action_client_wait_set_get_entities_ready(
    const rcl_wait_set_t * wait_set,
    const rcl_action_client_t * action_client,
    bool * is_feedback_ready,
    bool * is_status_ready,
    bool * is_goal_response_ready,
    bool * is_cancel_response_ready,
    bool * is_result_response_ready)
  {
    RCL_CHECK_ARGUMENT_FOR_NULL(wait_set, RCL_RET_WAIT_SET_INVALID);
    if (!rcl_action_client_is_valid(action_client)) {
      return RCL_RET_ACTION_CLIENT_INVALID;  // error already set
    }
    RCL_CHECK_ARGUMENT_FOR_NULL(is_feedback_ready, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(is_status_ready, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(is_goal_response_ready, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(is_cancel_response_ready, RCL_RET_INVALID_ARGUMENT);
    RCL_CHECK_ARGUMENT_FOR_NULL(is_result_response_ready, RCL_RET_INVALID_ARGUMENT);
  
    const rcl_action_client_impl_t * impl = action_client->impl;
    const size_t feedback_index = impl->wait_set_feedback_subscription_index;
    const size_t status_index = impl->wait_set_status_subscription_index;
    const size_t goal_index = impl->wait_set_goal_client_index;
    const size_t cancel_index = impl->wait_set_cancel_client_index;
    const size_t result_index = impl->wait_set_result_client_index;
    if (feedback_index >= wait_set->size_of_subscriptions) {
      RCL_SET_ERROR_MSG("wait set index for feedback subscription is out of bounds");
      return RCL_RET_ERROR;
    }
    if (status_index >= wait_set->size_of_subscriptions) {
      RCL_SET_ERROR_MSG("wait set index for status subscription is out of bounds");
      return RCL_RET_ERROR;
    }
    if (goal_index >= wait_set->size_of_clients) {
      RCL_SET_ERROR_MSG("wait set index for goal client is out of bounds");
      return RCL_RET_ERROR;
    }
    if (cancel_index >= wait_set->size_of_clients) {
      RCL_SET_ERROR_MSG("wait set index for cancel client is out of bounds");
      return RCL_RET_ERROR;
    }
    if (result_index >= wait_set->size_of_clients) {
      RCL_SET_ERROR_MSG("wait set index for result client is out of bounds");
      return RCL_RET_ERROR;
    }
  
    const rcl_subscription_t * feedback_subscription = wait_set->subscriptions[feedback_index];
    const rcl_subscription_t * status_subscription = wait_set->subscriptions[status_index];
    const rcl_client_t * goal_client = wait_set->clients[goal_index];
    const rcl_client_t * cancel_client = wait_set->clients[cancel_index];
    const rcl_client_t * result_client = wait_set->clients[result_index];
    *is_feedback_ready = (&impl->feedback_subscription == feedback_subscription);
    *is_status_ready = (&impl->status_subscription == status_subscription);
    *is_goal_response_ready = (&impl->goal_client == goal_client);
    *is_cancel_response_ready = (&impl->cancel_client == cancel_client);
    *is_result_response_ready = (&impl->result_client == result_client);
    return RCL_RET_OK;
  }
  
  #ifdef __cplusplus
  }
  #endif
  