libevent的服务器和客户端的使用

╰+攻爆jí腚メ 2022-09-10 15:28 199阅读 0赞

server.c

#include <event2/event.h>
    #include <event2/bufferevent.h>
    #include <event2/listener.h>
    #include <stdio.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <string.h>
    #include <fcntl.h>
    
    void read_cb(struct bufferevent *bev, void *ctx)
    { 
        //read data form buffer.
        char buf[1024] = { 0};
        bufferevent_read(bev,buf,sizeof(buf));
        printf("recv buf : %s\n",buf);
    
        char* pt = "i have received the data you send!!!\n";
        bufferevent_write(bev,pt,strlen(pt) + 1);
        printf("ISEND DATA TO CLIENT!!!\n");
    }
    
    void write_cb(struct bufferevent *bev, void *arg)
    { 
        printf("from write_cb, the data have send\n");
    }
    
    void event_cb(struct bufferevent *bev, short events, void *ctx)
    { 
        if(events & BEV_EVENT_EOF)
        { 
            printf("connection closed\n");
        }
        else if(events & BEV_EVENT_ERROR)
        { 
            printf("some errors\n");
        }
    
        //free resources.
        bufferevent_free(bev);
    }
    
    void listen_cb(struct evconnlistener *listener,
                   evutil_socket_t fd,
                   struct sockaddr *addr,
                   int socklen, void *ptr)
    { 
        struct event_base* base = (struct event_base*)ptr;
        struct bufferevent* bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
        //set cb for bufferevent buffer.
        bufferevent_setcb(bev, read_cb, write_cb, event_cb, NULL);
        bufferevent_enable(bev, EV_READ);
    }
    
    int main01()
    { 
        //libevent context.
        struct event_base* base = event_base_new();
        //init serv info.
        struct sockaddr_in serv;
        memset(&serv,0, sizeof (serv));
        serv.sin_family = AF_INET;
        serv.sin_port = htons(8765);
        serv.sin_addr.s_addr = htonl(INADDR_ANY);
    
        struct evconnlistener * listen = NULL;
        listen = evconnlistener_new_bind(base, listen_cb, base,
                                         LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE,
                                         -1, (struct sockaddr*)&serv, sizeof (serv));
        // event loop.
        event_base_dispatch(base);
        evconnlistener_free(listen);
        event_base_free(base);
        return 0;
    }

client.c

#include <event2/event.h>
    #include <event2/bufferevent.h>
    #include <event2/listener.h>
    #include <stdio.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <string.h>
    #include <fcntl.h>
    #include <arpa/inet.h>
    void read_cb(struct bufferevent *bev, void *ctx)
    { 
        //read data form buffer.
        char buf[1024] = { 0};
        bufferevent_read(bev,buf,sizeof(buf));
        printf("recv buf : %s\n",buf);
    
    // char* pt = "i have received the data you send!!!\n";
    // bufferevent_write(bev,pt,strlen(pt) + 1);
        printf("ISEND DATA TO CLIENT!!!\n");
    }
    
    void write_cb(struct bufferevent *bev, void *arg)
    { 
        printf("from write_cb, the data have send\n");
    }
    
    void event_cb(struct bufferevent *bev, short events, void *ctx)
    { 
        if(events & BEV_EVENT_EOF)
        { 
            printf("connection closed\n");
            //free resources.
            bufferevent_free(bev);
        }
        else if(events & BEV_EVENT_ERROR)
        { 
            printf("some errors\n");
            //free resources.
            bufferevent_free(bev);
        }
        else if(events & BEV_EVENT_CONNECTED)
        { 
            printf("connetct successful\n");
        }
    }
    
    void read_terminal(evutil_socket_t fd, short events, void *args)
    { 
        struct bufferevent *bev = (struct bufferevent *)args;
        char buf[1024] = { 0};
        ssize_t len = read(fd, buf, sizeof (buf));
        bufferevent_write(bev, buf, len + 1);
    }
    
    int main(void)
    { 
        int fd = socket(AF_INET,SOCK_STREAM,0);
        struct sockaddr_in serv;
        memset(&serv,0, sizeof (serv));
        serv.sin_family = AF_INET;
        serv.sin_port = htons(8765);
        inet_aton("127.0.0.1", (struct in_addr*)&serv.sin_addr.s_addr);
    
        //libevent context.
        struct event_base* base = event_base_new();
    
        struct bufferevent *bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
        bufferevent_socket_connect(bev, &serv, sizeof (serv));
    
        bufferevent_setcb(bev,read_cb, write_cb, event_cb, NULL);
        bufferevent_enable(bev, EV_READ);
    
        struct event* ev = event_new(base,STDIN_FILENO, EV_READ | EV_PERSIST,
                  read_terminal,bev);
        event_add(ev, NULL);
        //loop.
        event_base_dispatch(base);
    
        event_base_free(base);
        return 0;
    }