BUFFER之二（37）

原创 于 2013-11-08 10:55:09 发布 · 1k 阅读 · 0 ·
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应用程序想关闭连接，但是可能正处于发送数据的过程中，output buffer中有数据还没有发送完
不能直接调用close

conn->send(buff)
conn->shutdown()

POLLOUT事件
关闭写的这一半
连接状态更改为kDisconnection，并没有关闭连接

服务器主动断开与客户端的连接
这意味着 客户端 read返回0
close(conn)

POLLHUP|POLLIN


如果是客户端主动关闭连接，那么服务器端只返回POLLIN
如果是服务器端主动关闭，然后客户端再关闭，那么服务器端返回POLLIN和POLLHUP事件


测试程序

服务器

#include <muduo/net/TcpServer.h>
#include <muduo/net/EventLoop.h>
#include <muduo/net/InetAddress.h>

#include <boost/bind.hpp>

#include <stdio.h>

using namespace muduo;
using namespace muduo::net;

class TestServer
{
 public:
  TestServer(EventLoop* loop,
             const InetAddress& listenAddr)
    : loop_(loop),
      server_(loop, listenAddr, "TestServer")
  {
    server_.setConnectionCallback(
        boost::bind(&TestServer::onConnection, this, _1));
    server_.setMessageCallback(
        boost::bind(&TestServer::onMessage, this, _1, _2, _3));

    message1_.resize(100);
    message2_.resize(200);
    std::fill(message1_.begin(), message1_.end(), 'A');
    std::fill(message2_.begin(), message2_.end(), 'B');
  }

  void start()
  {
      server_.start();
  }

 private:
  void onConnection(const TcpConnectionPtr& conn)
  {
    if (conn->connected())
    {
      printf("onConnection(): new connection [%s] from %s\n",
             conn->name().c_str(),
             conn->peerAddress().toIpPort().c_str());
      conn->send(message1_);
      conn->send(message2_);
      conn->shutdown();
    }
    else
    {
      printf("onConnection(): connection [%s] is down\n",
             conn->name().c_str());
    }
  }

  void onMessage(const TcpConnectionPtr& conn,
                 Buffer* buf,
                 Timestamp receiveTime)
  {
    muduo::string msg(buf->retrieveAllAsString());
    printf("onMessage(): received %zd bytes from connection [%s] at %s\n",
           msg.size(),
           conn->name().c_str(),
           receiveTime.toFormattedString().c_str());

    conn->send(msg);
  }

  EventLoop* loop_;
  TcpServer server_;

  muduo::string message1_;
  muduo::string message2_;
};


int main()
{
  printf("main(): pid = %d\n", getpid());

  InetAddress listenAddr(8888);
  EventLoop loop;

  TestServer server(&loop, listenAddr);
  server.start();

  loop.loop();
}

客户端

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
 //该程序可能出现粘包问题
#define ERR_EXIT(m) \
        do \
        { \
                perror(m); \
                exit(EXIT_FAILURE); \
        } while(0)

int main(void)
{
    int sock;
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
        ERR_EXIT("socket");

    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(8888);
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    if (connect(sock, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
        ERR_EXIT("connect");

    char buf[1024] ={0};
    while (1)
    {
        int ret = read(sock, buf, sizeof(buf));
        printf("ret=%d\n", ret);
        if (ret == 0)
            break;

        fputs(buf, stdout);
        fflush(stdout);
        memset(buf, 0, sizeof(buf));
    }

    sleep(10);
    close(sock);

    return 0;
}

程序输出

服务器：

ubuntu@ubuntu-virtual-machine:~/pro/37$ ./build/debug/bin/reactor_test12 
main(): pid = 8683
20131024 07:19:37.457271Z  8683 TRACE updateChannel fd = 4 events = 3 - EPollPoller.cc:104
20131024 07:19:37.457470Z  8683 TRACE EventLoop EventLoop created 0xBFDDAB44 in thread 8683 - EventLoop.cc:62
20131024 07:19:37.457485Z  8683 TRACE updateChannel fd = 5 events = 3 - EPollPoller.cc:104
20131024 07:19:37.457645Z  8683 TRACE updateChannel fd = 6 events = 3 - EPollPoller.cc:104
20131024 07:19:37.457661Z  8683 TRACE loop EventLoop 0xBFDDAB44 start looping - EventLoop.cc:94
20131024 07:19:47.468016Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:19:57.478500Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:07.488977Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:17.499503Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:27.509985Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:37.520451Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:47.528439Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:20:57.538942Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:21:01.262358Z  8683 TRACE poll 1 events happended - EPollPoller.cc:65
20131024 07:21:01.262792Z  8683 TRACE printActiveChannels {6: IN }  - EventLoop.cc:257
20131024 07:21:01.262820Z  8683 TRACE handleEventWithGuard 2222222222222222POLLIN22222222222222222222 - Channel.cc:89
20131024 07:21:01.262881Z  8683 INFO  TcpServer::newConnection [TestServer] - new connection [TestServer:0.0.0.0:8888#1] from 127.0.0.1:56659 - TcpServer.cc:93
20131024 07:21:01.262916Z  8683 DEBUG TcpConnection TcpConnection::ctor[TestServer:0.0.0.0:8888#1] at 0x96C65D0 fd=8 - TcpConnection.cc:62
20131024 07:21:01.262934Z  8683 TRACE newConnection [1] usecount=1 - TcpServer.cc:111
20131024 07:21:01.262961Z  8683 TRACE newConnection [2] usecount=2 - TcpServer.cc:113
20131024 07:21:01.262981Z  8683 TRACE connectEstablished [3] usecount=6 - TcpConnection.cc:231
20131024 07:21:01.262998Z  8683 TRACE updateChannel fd = 8 events = 3 - EPollPoller.cc:104
onConnection(): new connection [TestServer:0.0.0.0:8888#1] from 127.0.0.1:56659
20131024 07:21:01.263363Z  8683 TRACE connectEstablished [4] usecount=6 - TcpConnection.cc:236
20131024 07:21:01.263378Z  8683 TRACE newConnection [5] usecount=2 - TcpServer.cc:122
20131024 07:21:11.265287Z  8683 TRACE poll 1 events happended - EPollPoller.cc:65
20131024 07:21:11.265469Z  8683 TRACE printActiveChannels {8: IN HUP }  - EventLoop.cc:257
20131024 07:21:11.265483Z  8683 TRACE handleEvent [6] usecount=2 - Channel.cc:67
20131024 07:21:11.265491Z  8683 TRACE handleEventWithGuard 1111111111111111POLLHUP1111111111111111111 - Channel.cc:85
20131024 07:21:11.265498Z  8683 TRACE handleEventWithGuard 2222222222222222POLLIN22222222222222222222 - Channel.cc:89
20131024 07:21:11.265556Z  8683 TRACE handleClose fd = 8 state = 3 - TcpConnection.cc:297
20131024 07:21:11.265567Z  8683 TRACE updateChannel fd = 8 events = 0 - EPollPoller.cc:104
onConnection(): connection [TestServer:0.0.0.0:8888#1] is down
20131024 07:21:11.265588Z  8683 TRACE handleClose [7] usecount=3 - TcpConnection.cc:305
20131024 07:21:11.265604Z  8683 INFO  TcpServer::removeConnectionInLoop [TestServer] - connection TestServer:0.0.0.0:8888#1 - TcpServer.cc:153
20131024 07:21:11.265611Z  8683 TRACE removeConnectionInLoop [8] usecount=6 - TcpServer.cc:157
20131024 07:21:11.265626Z  8683 TRACE removeConnectionInLoop [9] usecount=5 - TcpServer.cc:159
20131024 07:21:11.265639Z  8683 TRACE removeConnectionInLoop [10] usecount=6 - TcpServer.cc:170
20131024 07:21:11.265646Z  8683 TRACE handleClose [11] usecount=3 - TcpConnection.cc:308
20131024 07:21:11.265652Z  8683 TRACE handleEvent [12] usecount=2 - Channel.cc:69
20131024 07:21:11.265659Z  8683 TRACE removeChannel fd = 8 - EPollPoller.cc:147
20131024 07:21:11.265682Z  8683 DEBUG ~TcpConnection TcpConnection::dtor[TestServer:0.0.0.0:8888#1] at 0x96C65D0 fd=8 - TcpConnection.cc:69
20131024 07:21:21.275816Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:21:31.285830Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
20131024 07:21:41.296314Z  8683 TRACE poll  nothing happended - EPollPoller.cc:74
^C
ubuntu@ubuntu-virtual-machine:~/pro/37$

客户端：

ubuntu@ubuntu-virtual-machine:~/pro/37$ ./a.out 
ret=300
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBret=0


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