Linux网络编程--聊天室客户端程序

来源：互联网发布：如何年入百万知乎编辑：程序博客网时间：2024/04/19 00:21

聊天室客户端程序

#define _GNU_SOURCE 1#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 <string.h>#include <stdlib.h>#include <poll.h>#include <fcntl.h>#define BUFFER_SIZE 64int 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] );    struct sockaddr_in server_address;    bzero( &server_address, sizeof( server_address ) );    server_address.sin_family = AF_INET;    inet_pton( AF_INET, ip, &server_address.sin_addr );    server_address.sin_port = htons( port );    int sockfd = socket( PF_INET, SOCK_STREAM, 0 );    assert( sockfd >= 0 );    if ( connect( sockfd, ( struct sockaddr* )&server_address, sizeof( server_address ) ) < 0 )    {        printf( "connection failed\n" );        close( sockfd );        return 1;    }    struct pollfd fds[2];    fds[0].fd = 0;    fds[0].events = POLLIN;    fds[0].revents = 0;    fds[1].fd = sockfd;    fds[1].events = POLLIN | POLLRDHUP;    fds[1].revents = 0;    char read_buf[BUFFER_SIZE];    int pipefd[2];    int ret = pipe( pipefd );    assert( ret != -1 );    while( 1 )    {        ret = poll( fds, 2, -1 );        if( ret < 0 )        {            printf( "poll failure\n" );            break;        }        if( fds[1].revents & POLLRDHUP )        {            printf( "server close the connection\n" );            break;        }        else if( fds[1].revents & POLLIN )        {            memset( read_buf, '\0', BUFFER_SIZE );            recv( fds[1].fd, read_buf, BUFFER_SIZE-1, 0 );            printf( "%s\n", read_buf );        }        if( fds[0].revents & POLLIN )        {            ret = splice( 0, NULL, pipefd[1], NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );            ret = splice( pipefd[0], NULL, sockfd, NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );        }    }        close( sockfd );    return 0;}

测试1

开启服务端侦听：nc -l 6789

运行客户端程序：./a.out 127.0.0.1 6789

[fes@fes ~]$ nc -l 6789Hello WorldHi Boy hi gils[fes@fes test]$ ./a.out 127.0.0.1 6789Hello WorldHi Boy hi gils

测试2

[fes@fes test]$ ./a.out 202.108.22.5 80GET / HTTP/1.0HTTP/1.1 200 OKDate: Tue, 28 Oct 2014 08:42:21 GMTContent-Type: text/htmlContent-Length: 14613Last-Modified: Wed, 03 Sep 2014 02:48:32 GMTConnection: CloseVary: Accept-EncodingSet-Cookie: BAIDUID=BB394409C2863298A47B3D23F81817CC:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.comSet-Cookie: BAIDUPSID=BB394409C2863298A47B3D23F81817CC; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.comSet-Cookie: BDSVRTM=0; path=/P3P: CP=" OTI DSP COR IVA OUR IND COM "Server: BWS/1.1Pragma: no-cacheCache-control: no-cacheBDPAGETYPE: 1BDQID: 0xac1b0f5500017ba2BDUSERID: 0Accept-Ranges: bytes<!DOCTYPE html><!--STATUS OK--><html><head><meta http-equiv="content-type" content="text/html;charset=utf-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><link rel="dns-prefetch" href="//s1.bdstatic.com"/><link rel="dns-prefetch" href="//t1.baidu.com"/><link rel="dns-prefetch" href="//t2.baidu.com"/><link rel="dns-prefetch" href="//t3.baidu.com"/><link rel="dns-prefetch" href="//t10.baidu.com"/><link rel="dns-prefetch" href="//t11.baidu.com"/><link rel="dns-prefetch" href="//t12.baidu.com"/><link rel="dns-prefetch" href="//b1.bdstatic.com"/>

......

客户端连接百度,实现HTTP测试

程序收获

1、poll函数在IO复用中的应用

2、splice函数高效复制

3、nc命令在网络中的应用

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