Libevent示例程序5 echo服务器

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//服务器代码//echoServer.c#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <assert.h> #include <event2/event.h>#include <event2/bufferevent.h> const int LISTEN_PORT = 9999;const int LISTEN_BACKLOG = 32; void do_accept(evutil_socket_t listener, short event, void *arg);void read_cb(struct bufferevent *bev, void *arg);void error_cb(struct bufferevent *bev, short event, void *arg);void write_cb(struct bufferevent *bev, void *arg); int main(int argc, char *argv[]){    evutil_socket_t listener;    struct sockaddr_in sin;      listener = socket(AF_INET, SOCK_STREAM, 0);    assert(listener > 0);    evutil_make_listen_socket_reuseable(listener);     sin.sin_family = AF_INET;    sin.sin_addr.s_addr = INADDR_ANY;    sin.sin_port = htons(LISTEN_PORT);     if(bind(listener, (struct sockaddr*)&sin, sizeof(sin)) < 0)    {        perror("listen");        return 1;    }         if (listen(listener, LISTEN_BACKLOG) < 0)    {        perror("listen");        return 1;  }     printf ("Listening...\n");         evutil_make_socket_nonblocking(listener);    struct event_base *main_base = event_base_new();    assert(main_base != NULL);    struct event *listen_event = NULL;    listen_event = event_new(main_base, listener, EV_READ|EV_PERSIST, do_accept, (void*)main_base);    event_add(listen_event, NULL);    event_base_dispatch(main_base);     return 0;} void do_accept(evutil_socket_t listener, short event, void *arg){    struct event_base *base = (struct event_base*)arg;    evutil_socket_t connfd;    struct sockaddr_in sin;    socklen_t slen = sizeof(struct sockaddr_in);    connfd = accept(listener, (struct sockaddr *)&sin, &slen);    if(connfd < 0)    {        perror("accept");        return;    }    if(connfd > FD_SETSIZE)    {        perror("connfd > FD_SETSIZE");        return;    }     struct bufferevent *bev = bufferevent_socket_new(base, connfd, BEV_OPT_CLOSE_ON_FREE);    bufferevent_setcb(bev, read_cb, NULL, error_cb, arg);    bufferevent_enable(bev, EV_READ|EV_WRITE|EV_PERSIST);}  void read_cb(struct bufferevent *bev, void *arg){    const int MAX_LINE = 255;    char line[MAX_LINE + 1];    int n;    while(n = bufferevent_read(bev, line, MAX_LINE), n > 0)    {        line[n] = '\0';        bufferevent_write(bev, line, n);        printf("%s\n",line);    }  } void write_cb(struct bufferevent *bev, void *arg){} void error_cb(struct bufferevent *bev, short event, void *arg){    bufferevent_free(bev);}

//客户端代码//echoclient.c#include<stdio.h>#include<string.h> #include<sys/socket.h> #include<arpa/inet.h>  int main(int argc , char *argv[]){    int sock;    struct sockaddr_in server;    char message[1000] , server_reply[2000];          sock = socket(AF_INET , SOCK_STREAM , 0);    if (sock == -1)    {        printf("Could not create socket");    }          server.sin_addr.s_addr = inet_addr("127.0.0.1");    server.sin_family = AF_INET;    server.sin_port = htons(9999);      if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0)    {        perror("connect failed. Error");        return 1;    }    printf("Connected\n");          while(1)    {        printf("Enter message : ");        scanf("%s" , message);                  //Send some data        if( send(sock , message , strlen(message) , 0) < 0)        {            perror("Send failed");            return 1;        }                  //Receive a reply from the server        memset(server_reply, 0, sizeof(server_reply));        if( recv(sock , server_reply , 2000 , 0) < 0)        {            perror("recv failed");            break;        }                  printf("Server reply :\n%s\n", server_reply);    }          close(sock);    return 0;}

from http://www.cnblogs.com/yemsheng/archive/2013/04/16/3023265.html

参考

http://www.felix021.com/blog/read.php?2068

http://www.binarytides.com/server-client-example-c-sockets-linux/

http://www.cppblog.com/lk624424108/articles/162909.html

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