Linux socket 测试

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Client : mini2440

Server : PC Ubuntu

网络的socket数据传输是一种特殊的I/O,socket也是一种文件描述符。socket也有一个类似于打开文件的函数：socket(),调用socket(),该函数返回一个整型的socket的描述符，随后的连接建立、数据传输等操作也都是通过该socket实现。此次测试用mini2440做Client，PC机做Server，同时连接上局域网。ping通之后，在mini2440上运行client.c，PC上运行server.c。

client.c :

#include <stdlib.h>#include <sys/types.h>#include <stdio.h>#include <sys/socket.h>#include <netinet/in.h>#include <string.h>int main(){int cfd;int recbytes;int sin_size;char buffer[1024]={0};   struct sockaddr_in s_add,c_add;unsigned short portnum=0x8888;  //port numbercfd = socket(AF_INET, SOCK_STREAM, 0);if(-1 == cfd){    printf("socket fail ! \r\n");    return -1;}bzero(&s_add,sizeof(struct sockaddr_in));s_add.sin_family=AF_INET;s_add.sin_addr.s_addr= inet_addr("172.20.21.247");   //IP of your PC s_add.sin_port=htons(portnum);printf("s_addr = %#x ,port : %#x\r\n",s_add.sin_addr.s_addr,s_add.sin_port);if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))){    printf("connect fail !\r\n");    return -1;}printf("connect ok !\r\n");if(-1 == (recbytes = read(cfd,buffer,1024))){    printf("read data fail !\r\n");    return -1;}buffer[recbytes]='\0';printf("%s\r\n",buffer);getchar();close(cfd);return 0;}

server.c :

#include <stdlib.h>#include <sys/types.h>#include <stdio.h>#include <sys/socket.h>#include <netinet/in.h>#include <string.h>int main(){int sfp,nfp;struct sockaddr_in s_add,c_add;int sin_size;unsigned short portnum=0x8888;     //port numbersfp = socket(AF_INET, SOCK_STREAM, 0);if(-1 == sfp){    printf("socket fail ! \r\n");    return -1;}printf("socket ok !\r\n");bzero(&s_add,sizeof(struct sockaddr_in));s_add.sin_family=AF_INET;s_add.sin_addr.s_addr=htonl(INADDR_ANY);s_add.sin_port=htons(portnum);if(-1 == bind(sfp,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))){    printf("bind fail !\r\n");    return -1;}if(-1 == listen(sfp,5)){    printf("listen fail !\r\n");    return -1;}while(1){sin_size = sizeof(struct sockaddr_in);nfp = accept(sfp, (struct sockaddr *)(&c_add), &sin_size);if(-1 == nfp){    printf("accept fail !\r\n");    return -1;}printf("waiting for %#x : %#x\r\n",ntohl(c_add.sin_addr.s_addr),ntohs(c_add.sin_port));if(-1 == write(nfp,"hello,socket\r\n",32)){    printf("write fail!\r\n");    return -1;}printf("write ok!\r\n");close(nfp);}close(sfp);return 0;}

编译client.c: arm-linux-gcc -o client client.c 生成client可执行文件

编译server.c: gcc -o server server.c 生成server可执行文件

拷贝client到mini2440

PC机运行server：

root@desktop:~# ./server

socket ok !

mini2440运行client：

[root＠FriendlyARM ／sdcard] # ./client

s_addr = 0xf71514ac ,port : 0x8888

connect ok !

hello,socket

客户端已经收到了服务端发出的"hello,socket"的字符串

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