Linux C socket 封装

/**************************************************************************
 *                        Linux C socket 封装
 * 声明:
 *      同样的代码当然没必要敲很多遍了,一遍就够了,封起来,什么时候要用,
 *  什么时候就来这里拿。
 *
 *                                   2015-7-4 晴 深圳 南山平山村 曾剑锋
 *************************************************************************/

                    \\\\\\\\-*- 目录 -*-////////
                    |  一、cat zengjf_socket.h
                    |  二、cat zengjf_socket.c
                    \\\\\\\\\\\\\\//////////////

一、cat zengjf_socket.h
    #ifndef __ZENGJF_SOCKET_H__
        #define __ZENGJF_SOCKET_H__
    
        #include <stdio.h>
        #include <stdlib.h>
        #include <string.h>
        #include <sys/types.h>
        #include <sys/socket.h>
        #include <netinet/in.h>
        #include <arpa/inet.h>
        #include <unistd.h>
    
        #define handle_error(msg) { perror(msg); exit(EXIT_FAILURE); }
    
        /**
         * 客户端socket
         * 参数说明:
         *      1.ip:服务器ip地址,点分十进制的ip字符串
         *      2.port:服务器端口号,字串的形式
         *      3.srvaddr:连接到服务器端的sockaddr_in
         */
        int socketClient(char* ip, char* port, struct sockaddr_in* srvaddr);
        /**
         * 服务器端socket
         * 参数说明:
         *      1.port:监听端口号,是字串的形式
         *      2.srvaddr:服务器的sockaddr_in
         *
         *
         *      服务器端socket默认能够同时监听30个连接
         */
        int socketServer(char* port, struct sockaddr_in* srvaddr);
    
    #endif // __ZENGJF_SOCKET_H__

二、cat zengjf_socket.c
    #include "zengjf_socket.h"
    
    int socketClient(char* ip, char* port, struct sockaddr_in* srvaddr){
    
        int sfd;
    
        // create a socket
        if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
            handle_error("can not create socketClient.");
        }
    
        // set the server socket address
        srvaddr->sin_family = AF_INET;
        srvaddr->sin_port = htons(atoi(port));
        inet_aton(ip, &(srvaddr->sin_addr));
    
        // connect
        if (connect(sfd, (struct sockaddr *)srvaddr, sizeof(struct sockaddr)) == -1){
            handle_error("can not connect to server.");
        }
    
        return sfd;
    }
    
    int socketServer(char* port, struct sockaddr_in* srvaddr){
    
        int srv_fd;
        //the default listen count
        int listenCount = 30;
    
        // create a socket
        if ((srv_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
            handle_error("can not create socketServer.");
        }
    
        //reuse the socket address
        int sockopt = 1;
        setsockopt(srv_fd, SOL_SOCKET, SO_REUSEADDR, &sockopt, sizeof(sockopt));
    
        // set the socket address
        srvaddr->sin_family = AF_INET;
        srvaddr->sin_port = htons(atoi(port));
        srvaddr->sin_addr.s_addr = htonl(INADDR_ANY);
    
        // bind the socket with the address
        if (bind(srv_fd, (struct sockaddr *)srvaddr, sizeof(struct sockaddr)) == -1){
            handle_error("can not bind the address.");
        }
    
        // listening 
        // default was 30
        if (listen(srv_fd, listenCount) == -1){
            handle_error("can not listening to the port.");
        }
    
        return srv_fd;
    }

 

posted on 2015-07-05 15:18  zengjf  阅读(834)  评论(0编辑  收藏  举报

导航