套接字socket实现网络发送接收数据

头文件head.h

#ifndef __HEAD_H__
#define __HEAD_H__
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<string.h>
#include<sys/ipc.h>
#include<wait.h>
#include<fcntl.h>
#include<unistd.h>
#include<time.h>
#include<dirent.h>
#include<pthread.h>
#include<stdlib.h>
#include<sys/sem.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<netinet/in.h>
#define SERVER_PORT 8800
#define SERVER_IP "192.168.8.101"
#define IP_ADDR "192.168.8.102"
#define PORT 5201
#define NUM 10
#define ERR_MSG(msg) do{\
	printf("line=%d\n",__LINE__);\
	perror(msg);\
}while(0)
#endif

服务端
main.c

#include"head.h"
int main(int argc, const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0){
		ERR_MSG("socket");
		return -1;
	}
	int reuse=1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	struct sockaddr_in sina;
	sina.sin_family = AF_INET;
	sina.sin_port  =htons(PORT);
	sina.sin_addr.s_addr = inet_addr(IP_ADDR);
	if(bind(sfd,(struct sockaddr*)&sina,sizeof(sina))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("success:%d\n",__LINE__);
	if(listen(sfd,99)<0)
	{
		perror("listen");
		return -1;
	}
	struct sockaddr_in csin;
	socklen_t len = sizeof(csin);
	int newfd=accept(sfd,(struct sockaddr *)&csin,&len);
	char buf[128]="";
	size_t res,resa;
	while (1)
	{
		bzero(buf,sizeof(buf));
		res=recv(newfd,buf,sizeof(buf),0);
		if(res>0){
			printf("%s\n",buf);
			resa = send(newfd,buf,sizeof(buf),0);
			if(resa<0)
			{
				printf("send erro\n");
				break;
			}else if(resa==0)
			{
				printf("close\n");
				break;
			}
		}else if(res<0)
		{
			ERR_MSG("recv");
			return -1;
		}else{
			printf("suisuanguanbi\n");
			break;
		}
	}
	if(close(newfd)<0)
	{
		perror("newfd");
		return -1;
	}
	if(close(sfd)<0)
	{
		perror("close");
		return -1;
	}
	return 0;
}

客户端
client.c

#include"head.h"
#include<errno.h>
int main(int argc, const char *argv[])
{
	int sdf = socket(AF_INET,SOCK_STREAM,0);
	if(sdf<0){
		ERR_MSG("socket");
		return -1;
	}
	struct sockaddr_in ssin;
	ssin.sin_family = AF_INET;
	ssin.sin_port = htons(SERVER_PORT);
	ssin.sin_addr.s_addr = inet_addr(SERVER_IP);
	printf("%d\n",sdf);
	if(connect(sdf,(struct sockaddr*)&ssin,sizeof(ssin))<0)
	{
		printf("connect error\n");
		return -1;
	}

	int i=0;
	size_t res,resa;
	char buf[10]="hello";
	char buft[128]={0};
	while (i++<5)
	{
		bzero(buft,sizeof(buft));
		res = send(sdf,buf,sizeof(buf),0);a
		if(res>0){
			resa = recv(sdf,buft,sizeof(buft),0);
			if(resa>0){
				printf("%s\n",buft);
			}else{
				break;
			}
		}else{
			break;
		}
	}
	close(sdf);

	return 0;
}