Linux下C语言实现TCP Socket编程
TCP协议:
TCP/IP(Transmission Control Protocol/Internet Protocol) 即传输控制协议/网间协议,是一种面向连接(连接导向)的、可靠的、基于字节流的运输层(Transport layer)通信协议。
TCP服务器端和客户端流程:
具体函数:
具体实现:
服务器端:
ser.c
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
#include<assert.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
int main()
{
int sockfd=socket(AF_INET,SOCK_STREAM,0);
assert(sockfd!=-1);
struct sockaddr_in ser,cli;
memset(&ser,0,sizeof(ser));
ser.sin_family=AF_INET;
ser.sin_port=htons(6000);
ser.sin_addr.s_addr=inet_addr("127.0.0.1");
int res=bind(sockfd,(struct sockaddr*)&ser,sizeof(ser));
assetr(res!=-1);
listen(sockfd,5);
while(1)
{
int len=sizeof(cli);
int c=accept(sockfd,(struct sockaddr*)&cli,&len);
if(c<0)
{
perror("error\n");
continue;
}
while(1)
{
char recvbuf[128]={0};
int n=recv(c,recvbuf,127,0);
if(n<=0)
{
printf("one client over\n");
break;
}
printf("%d:%s\n",c,recvbuf);
send(c,"OK",2,0);
}
close(c);
}
close(sockfd);
}
客户端:
cli.c
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<assert.h>
#include<string.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
int main()
{
int sockfd=socket(AF_INET,SOCK_STREAM,0);
assert(sockfd!=-1);
struct sockaddr_in ser,cli;
memset(&ser,0,sizeof(ser));
ser.sin_family=AF_INET;
ser.sin_port=htons(6000);
ser.sin_addr.s_addr=inet_addr("127.0.0.1");
int res=connect(sockfd,(struct sockaddr*)&ser,sizeof(ser));
assert(res!=-1);
while(1)
{
printf("please input:");
fflush(stdout);
char buff[128]={0};
fgets(buff,128,stdin);
buff[strlen(buff)-1]=0;
if(strcmp(buff,"end")==0)
{
break;
}
send(sockfd,buff,strlen(buff),0);
char recvbuff[128]={0};
recv(sockfd,recvbuff,127,0);
printf("%s\n",recvbuff);
}
close(sockfd);
}