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Linux网络编程--聊天室客户端程序
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 64 int 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 6789 Hello World Hi Boy hi gils [fes@fes test]$ ./a.out 127.0.0.1 6789 Hello World Hi Boy hi gils
测试2
[fes@fes test]$ ./a.out 202.108.22.5 80 GET / HTTP/1.0 HTTP/1.1 200 OK Date: Tue, 28 Oct 2014 08:42:21 GMT Content-Type: text/html Content-Length: 14613 Last-Modified: Wed, 03 Sep 2014 02:48:32 GMT Connection: Close Vary: Accept-Encoding Set-Cookie: BAIDUID=BB394409C2863298A47B3D23F81817CC:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BAIDUPSID=BB394409C2863298A47B3D23F81817CC; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BDSVRTM=0; path=/ P3P: CP=" OTI DSP COR IVA OUR IND COM " Server: BWS/1.1 Pragma: no-cache Cache-control: no-cache BDPAGETYPE: 1 BDQID: 0xac1b0f5500017ba2 BDUSERID: 0 Accept-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=http://www.mamicode.com/"//s1.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
Linux网络编程--聊天室客户端程序
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