IO复用高级应用：同时处理TCP和UDP服务

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#define MAX_EVENT_NUMBER 1024 //最大事件数目  
#define TCP_BUFFER_SIZE 512//TCP缓冲区  
#define UDP_BUFFER_SIZE 1024//UDP缓冲区  
  
int setnonblocking( int fd )//设置为非阻塞描述符  
{  
    int old_option = fcntl( fd, F_GETFL );  
    int new_option = old_option | O_NONBLOCK;  
    fcntl( fd, F_SETFL, new_option );  
    return old_option;  
}  
  
void addfd( int epollfd, int fd )//注册事件  
{  
    epoll_event event;  
    event.data.fd = fd;  
    //event.events = EPOLLIN | EPOLLET;  
    event.events = EPOLLIN;//可读事件  
    epoll_ctl( epollfd, EPOLL_CTL_ADD, fd, &event );  
    setnonblocking( fd );  
}  
  
int main( int argc, char* argv[] )  
{  
    if( argc <= 2 )  
    {  
        printf( "usage: %s ip_address port_number\n", basename( argv[0] ) );  
        return 1;  
    }  
    const char* ip = argv[1];  
    int port = atoi( argv[2] );  
  
    int ret = 0;  
    struct sockaddr_in address;//绑定TCP端口  
    bzero( &address, sizeof( address ) );  
    address.sin_family = AF_INET;  
    inet_pton( AF_INET, ip, &address.sin_addr );  
    address.sin_port = htons( port );  
  
    int listenfd = socket( PF_INET, SOCK_STREAM, 0 );  
    assert( listenfd >= 0 );  
  
    ret = bind( listenfd, ( struct sockaddr* )&address, sizeof( address ) );  
    assert( ret != -1 );  
  
    ret = listen( listenfd, 5 );  
    assert( ret != -1 );  
  
    bzero( &address, sizeof( address ) );//绑定UDP端口  
    address.sin_family = AF_INET;  
    inet_pton( AF_INET, ip, &address.sin_addr );  
    address.sin_port = htons( port );  
    int udpfd = socket( PF_INET, SOCK_DGRAM, 0 );  
    assert( udpfd >= 0 );  
  
    ret = bind( udpfd, ( struct sockaddr* )&address, sizeof( address ) );  
    assert( ret != -1 );  
  
    epoll_event events[ MAX_EVENT_NUMBER ];  
    int epollfd = epoll_create( 5 );  
    assert( epollfd != -1 );  
    addfd( epollfd, listenfd );//TCP端口注册事件  
    addfd( epollfd, udpfd );//UDP端口注册事件  
  
    while( 1 )  
    {  
        int number = epoll_wait( epollfd, events, MAX_EVENT_NUMBER, -1 );//无限期等待事件发生  
        if ( number < 0 )  
        {  
            printf( "epoll failure\n" );  
            break;  
        }  
      
        for ( int i = 0; i < number; i++ )//EPOLL就绪事件  
        {  
            int sockfd = events[i].data.fd;  
            if ( sockfd == listenfd )//监听端口监听TCP连接事件  
            {  
                struct sockaddr_in client_address;  
                socklen_t client_addrlength = sizeof( client_address );  
                int connfd = accept( listenfd, ( struct sockaddr* )&client_address, &client_addrlength );  
                addfd( epollfd, connfd );  
            }  
            else if ( sockfd == udpfd )//UDP连接  
            {  
                char buf[ UDP_BUFFER_SIZE ];  
                memset( buf, '\0', UDP_BUFFER_SIZE );  
                struct sockaddr_in client_address;  
                socklen_t client_addrlength = sizeof( client_address );//客户端地址  
        //UDP专用接收数据  
                ret = recvfrom( udpfd, buf, UDP_BUFFER_SIZE-1, 0, ( struct sockaddr* )&client_address, &client_addrlength );  
                if( ret >





 0 )  
                {//UDP专用发送数据(回射数据)  
                    sendto( udpfd, buf, UDP_BUFFER_SIZE-1, 0, ( struct sockaddr* )&client_address, client_addrlength );  
                }  
            }  
            else if ( events[i].events & EPOLLIN )//TCP连接  
            {  
                char buf[ TCP_BUFFER_SIZE ];  
                while( 1 )  
                {  
                    memset( buf, '\0', TCP_BUFFER_SIZE );  
                    ret = recv( sockfd, buf, TCP_BUFFER_SIZE-1, 0 );  
                    if( ret < 0 )  
                    {  
                        if( ( errno == EAGAIN ) || ( errno == EWOULDBLOCK ) )//非阻塞出现这种errrno是读取数据完毕  
                        {  
                            break;  
                        }  
                        close( sockfd );  
                        break;  
                    }  
                    else if( ret == 0 )//关闭连接  
                    {  
                        close( sockfd );  
                    }  
                    else  
                    {  
                        send( sockfd, buf, ret, 0 );//回射数据  
                    }  
                }  
            }  
            else  
            {  
                printf( "something else happened \n" );  
            }  
        }  
    }  
  
    close( listenfd );  
    return 0;  
}  

#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#define BUF_SIZE 1024  
using namespace std;  
int main(int argc,char* argv[]){  
    if(argc<=2){  
        cout<<"argc<=2"<=0);  
    if(connect(sockfd,(struct sockaddr*)&server_address,sizeof(server_address))<0){//TCP数据发送与接收  
        cout<<"connect error"<