#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <assert.h>#include <stdio.h>#include <unistd.h>#include <errno.h>#include <string.h>#include <fcntl.h>#include <stdlib.h>#include <sys/epoll.h>#include <pthread.h>#define MAX_EVENT_NUMBER 1024#define TCP_BUFFER_SIZE 512#define UDP_BUFFER_SIZE 1024int setnonblocking( int fd ){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 ){struct epoll_event event;event.data.fd = fd;//event.events = EPOLLIN | EPOLLET;event.events = EPOLLIN;epoll_ctl( epollfd, EPOLL_CTL_ADD, fd, &event );setnonblocking( fd );}int main( int argc, char* argv[] ){const char* ip = "127.0.01";int port = 12345;int i=0;int ret = 0;struct sockaddr_in address;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 ) );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 );struct epoll_event events[ MAX_EVENT_NUMBER ];int epollfd = epoll_create( 5 );assert( epollfd != -1 );addfd( epollfd, listenfd );addfd( epollfd, udpfd );while( 1 ){int number = epoll_wait( epollfd, events, MAX_EVENT_NUMBER, -1 );if ( number < 0 ){printf( "epoll failure\n" );break;}for ( i = 0; i < number; i++ ){int sockfd = events[i].data.fd;if ( sockfd == listenfd ){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 ){char buf[ UDP_BUFFER_SIZE ];memset( buf, '\0', UDP_BUFFER_SIZE );struct sockaddr_in client_address;socklen_t client_addrlength = sizeof( client_address );ret = recvfrom( udpfd, buf, UDP_BUFFER_SIZE-1, 0, ( struct sockaddr* )&client_address, &client_addrlength );if( ret > 0 ){sendto( udpfd, buf, UDP_BUFFER_SIZE-1, 0, ( struct sockaddr* )&client_address, client_addrlength );}}else if ( events[i].events & EPOLLIN ){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 ) ){break;}close( sockfd );break;}else if( ret == 0 ){close( sockfd );}else{send( sockfd, buf, ret, 0 );}}}else{printf( "something else happened \n" );}}}close( listenfd );return 0;}
，只要看得开放得下，何愁没有快乐的春莺在啼鸣，
