Linux Network Programming--Chat room client program

Chat Room client program

#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 ("Co NnectiOn 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, ' + ', 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_mor E |            Splice_f_move); RET = SpliCE (pipefd[0], NULL, SOCKFD, NULL, 32768, Splice_f_more |        Splice_f_move);    }} close (SOCKFD); return 0;}

Test 1turn on the server to listen: Nc-l 6789Run the client program:./a.out 127.0.0.1 6789

[Email protected] ~]$ nc-l 6789Hello worldhi boy hi gils[[email protected] test]$./a.out 127.0.0.1 6789Hello Worldhi Bo Y Hi gils

Test 2

[[email protected] test]$./a.out 202.108.22.5 80get/http/1.0http/1.1, Oct okdate:tue 08:42:21 ent-type:text/htmlcontent-length:14613last-modified:wed, 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:0xa c1b0f5500017ba2bduserid:0accept-ranges:bytes<! DOCTYPE html><!--STATUS ok-->
......

Client Connection Baidu, implementing HTTP testProgram Harvesting1. Application of poll function in IO multiplexing2. Efficient replication of splice functions3, the application of NC command in the network



Linux Network Programming--Chat room client program