Linux下的网络编程学习（五）：socket api的TCP数据读写

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我是靠谱客的博主有魅力睫毛，最近开发中收集的这篇文章主要介绍Linux下的网络编程学习（五）：socket api的TCP数据读写，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

TCP的读写

有关TCP的socket编程接口的读写如下：
#include<sys/types.h>
#include<sys/socket.h>
ssize_t recv(int sockfd,void buf,size_t len ,int flags);
ssize_t send(int sockfd,const void buf,size_t len,int flags);
recv读取sockfd上的数据，buf和len分别指数据缓冲区的位置和大小。
send向sockfd上写数据，buf和len分别表示数据缓冲区的位置和大小，send成功时返回写入长度的大小
flags参数为数据收发提供了额外的控制，具体参数选择如下图：
在这里插入图片描述以下代码是有关flags参数取 MSG_OOB时的举例：

//fs
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
using namespace std;


int main(int argc, char* argv[])
{
	if (argc <= 2)
	{
		cout<<"usage:"<<basename(argv[0])<<"ip_address port_number"<<endl;
		return 1;
	}
	const char* ip = argv[1];
	int port = atoi (argv[2]);
	struct sockaddr_in server_address;
	bzero(&server_address,sizeof(server_address));
	server_address.sin_family = AF_INET;
	inet_pton (AF_INET,ip, &server_address.sin_addr);
	server_address.sin_port = htons(port);
	int sockfd = socket(PF_INET,SOCK_STREAM,0);
	assert (sockfd >= 0);
	if (connect (sockfd, (struct  sockaddr*)&server_address,sizeof(server_address)) < 0)
	{
		cout<<"connetion failed"<<endl;
		
	}
	else
	{
		const char* oob_data = "simon";
		const char* normal_data = "handsome!";
		send(sockfd,normal_data, strlen(normal_data),0);
		send(sockfd,oob_data,strlen(oob_data),MSG_OOB);
		send(sockfd,normal_data,strlen(normal_data),0);
	}
	close(sockfd);
	return 0 ;
}

//js
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
#define buf 1024
using namespace std;


int main(int argc, char* argv[])
{
	if (argc <= 2)
	{
		cout<<"usage:"<<basename(argv[0])<<"ip_address port_number"<<endl;
		return 1;
	}
	const char* ip = argv[1];
	int port = atoi (argv[2]);
	struct sockaddr_in address;
	bzero(&address,sizeof(address));
	address.sin_family = AF_INET;
	inet_pton (AF_INET,ip, &address.sin_addr);
	address.sin_port = htons(port);
	int sockfd = socket(PF_INET,SOCK_STREAM,0);
	assert (sockfd >= 0);
	int ret = bind(sock,(struct sockaddr*)&address,sizeof(address));
	assert(ret != -1);
	ret = listen (sock,5);
	assert(ret != -1);
	struct sockaddr_in client;
	sockelen_t client_addrlength = sizeof(client);
	int connfd = accept(sock,(struct sockaddr* )&client,&client_addrlength);
	if(connfd < 0)
	{
		cout<<"errno is:"<<errno;
		
	}
	else
	{
		char buffer[buf];
		memset(buffer,'',buf);//将buffer里面的buf长度用/0代替
		ret = recv(connfd , buffer, buf-1,0)
		cout<<"got "<<ret<<"bytes of normal data "<<buffer<<endl;
		memset(buffer,'',buf);
		ret = recv(connfd , buffer,buf-1,MSG_OOB);
		cout<<"got"<<ret<<"bytes of normal data "<<buffer<<endl;
		memset(buffer,'',buf);
		ret = recv(connfd , buffer,buf-1,0);
		cout<<"got"<<ret<<"bytes of normal data "<<buffer<<endl;
		
	}
	close(sock);
	return 0 ;
}