一、功能描述：
能够在Centos中创建TCP socket，实现Client给Server发送消息，Server能够Client发送消息。
二、代码如下：
①client代码：
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
int main()
{
int sockfd ; //socket标示
struct sockaddr_in serverAddr; //socket信息结构体
serverAddr.sin_family = AF_INET; //domain
serverAddr.sin_port = htons(6666); //server port
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); //server IP
if((sockfd=socket(AF_INET,SOCK_STREAM,0))< 0){ //socket()
printf("socket ERR!
");
return -1;
}
if( connect(sockfd, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1){ //connect()
printf("connect error: (errno: )
");
return -1;
}
if(send(sockfd,"Sending string,logo_fox",strlen("Sending string,logo_fox"),0)<0){ //send()
printf("send ERR!
");
return -1;
} close(sockfd);
return -1;
}
②server代码：
#include <stdio.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
int main(int argc ,char ** argv)
{
int sockfd, newfd; //sockfd: socket标示 ，newfd:accept标示
struct sockaddr_in serveraddr; //socket信息结构体
char buf[4096]; //数据缓存区
int n; //接收到的信息位数
serveraddr.sin_family=AF_INET; //socket domain
serveraddr.sin_port = htons(6666); //socket port
serveraddr.sin_addr.s_addr=htonl(INADDR_ANY); //socket IP info
if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0){ //socket()
printf("Socket ERR!
");
return -1;
}
if(bind(sockfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr))<0){ //bind()
printf("Bind ERR!%s(errno:%d)
",strerror(errno),errno);
return -1;
}
if(listen(sockfd,4)<0){ //listen()
printf("Listen ERR!
");
return -1;
}
while(1){
if((newfd=accept(sockfd,(struct sockaddr *)NULL,NULL))<0){ //accept()
printf("accept ERR!
");
return -1;
}
n = recv(newfd,buf,4096,0); //recv()
printf("n:%d
",n);
buf[n]='
'; //将接收到的信息变为字符串
printf("recv msg from client is :%s
",buf);
close(newfd); //关闭accept
}
close(sockfd); //关闭Socket
}
三、socket通讯流程
