text: /** @file
  
    A brief file description
  
    @section license License
  
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you 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.
   */
  
  /****************************************************************************
  
    P_UnixUDPConnection.h
    Unix UDPConnection implementation
  
  
   ****************************************************************************/
  #pragma once
  
  #include "P_UDPConnection.h"
  #include "P_UDPPacket.h"
  
  class UnixUDPConnection : public UDPConnectionInternal
  {
  public:
    void init(int the_fd);
    void setEthread(EThread *e);
    void errorAndDie(int e);
    int callbackHandler(int event, void *data);
  
    SLINK(UnixUDPConnection, newconn_alink);
    LINK(UnixUDPConnection, callback_link);
  
    // Incoming UDP Packet Queue
    ASLL(UDPPacketInternal, alink) inQueue;
    int onCallbackQueue;
    Action *callbackAction;
    EThread *ethread;
    EventIO ep;
  
    UnixUDPConnection(int the_fd);
    ~UnixUDPConnection() override;
  
  private:
    int m_errno;
    void UDPConnection_is_abstract() override{};
  };
  
  TS_INLINE
  UnixUDPConnection::UnixUDPConnection(int the_fd) : onCallbackQueue(0), callbackAction(nullptr), ethread(nullptr), m_errno(0)
  {
    fd = the_fd;
    SET_HANDLER(&UnixUDPConnection::callbackHandler);
  }
  
  TS_INLINE void
  UnixUDPConnection::init(int the_fd)
  {
    fd              = the_fd;
    onCallbackQueue = 0;
    callbackAction  = nullptr;
    ethread         = nullptr;
    m_errno         = 0;
  
    SET_HANDLER(&UnixUDPConnection::callbackHandler);
  }
  
  TS_INLINE void
  UnixUDPConnection::setEthread(EThread *e)
  {
    ethread = e;
  }
  
  TS_INLINE void
  UnixUDPConnection::errorAndDie(int e)
  {
    m_errno = e;
  }
  
  TS_INLINE Action *
  UDPConnection::recv(Continuation *c)
  {
    UnixUDPConnection *p = (UnixUDPConnection *)this;
    // register callback interest.
    p->continuation = c;
    ink_assert(c != nullptr);
    mutex         = c->mutex;
    p->recvActive = 1;
    return ACTION_RESULT_NONE;
  }
  
  TS_INLINE UDPConnection *
  new_UDPConnection(int fd)
  {
    return (fd >= 0) ? new UnixUDPConnection(fd) : nullptr;
  }
  