嵌入式linux实现scoket通信(语言）

服务端

等待客户端的连接

#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
int main()
{
int sfp,nfp;  //定义两个描述符
struct sockaddr_in s_add,c_add;
int sin_size;
unsigned short portnum=0x8888;  //服务端使用端口
printf("Hello,welcome to my server !\r\n");
sfp = socket(AF_INET,SOCK_STREAM, 0);
if(-1 == sfp)
{
printf("socket fail ! \r\n");
return -1;
}
printf("socket ok !\r\n");

//填充服务器端口地址信息，以便下面使用此地址和端口监听
bzero(&s_add,sizeof(struct sockaddr_in));
s_add.sin_family=AF_INET;
s_add.sin_addr.s_addr=htonl(INADDR_ANY);//地址使用全0,即所有
s_add.sin_port=htons(portnum);
//使用bind进行端口绑定
if(-1 == bind(sfp,(struct sockaddr *)(&s_add), sizeof(struct sockaddr)))
{
printf("bind fail !\r\n");
return -1;
}
printf("bind ok !\r\n");
//开始监听相应的端口
if(-1 == listen(sfp,5))
{
printf("listen fail !\r\n");
return -1;
}
printf("listen ok\r\n");
while(1)
{
sin_size = sizeof(struct sockaddr_in);
/*accept服务端使用函数，调用时即进入阻塞状态，等待用户进行连接，在没有客户端进行连接时，程序停止在此处， 
   不会看到后面的打印，当有客户端进行连接时，程序马上执行一次，然后再次循环到此处继续等待。 
   此处accept的第二个参数用于获取客户端的端口和地址信息。*/
nfp = accept(sfp, (struct sockaddr *)(&c_add), &sin_size);
if(-1 == nfp)
{
printf("accept fail !\r\n");
return -1;
}
printf("accept ok!\r\nServer start get connect from %s : %#x\r\n",inet_ntoa(c_add.sin_addr),c_add.sin_port);

if(-1 == send(nfp,"hello,welcome to my server \r\n",32,0))
{
printf("write fail!\r\n");
return -1;
}
printf("write ok!\r\n");
close(nfp);
}
close(sfp);
return 0;
}

客户端

#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include<unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
int main()
{
int cfd; //客户端套接字
int recbytes;
int sin_size;
char buffer[1024]={0};
struct sockaddr_in s_add,c_add;
unsigned short portnum=0x8888;
char *s=NULL;
printf("Hello,welcome to client !\r\n");

cfd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == cfd)
{
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= inet_addr("127.0.0.1");
s_add.sin_port=htons(portnum);
s=inet_ntoa(*(struct in_addr*)&s_add.sin_addr.s_addr);
printf("server ip is:%s,port is:%#x\r\n",s,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 = recv(cfd,buffer,1024,0)))
{
printf("read data fail !\r\n");
return -1;
}
printf("read ok\r\nREC:\r\n");
buffer[recbytes]='\0';
printf("%s\r\n",buffer);
getchar();
close(cfd);
return 0;
}

运行结果