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6_4.cpp
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6_4.cpp
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//
// Created by satellite on 7/07/2023.
// 使用splice函数实现回射服务器
#include "sys/socket.h"
#include "netinet/in.h"
#include "arpa/inet.h"
#include "assert.h"
#include "stdio.h"
#include "unistd.h"
#include "stdlib.h"
#include "errno.h"
#include "string.h"
#include "fcntl.h"
int main(int argc , char * argv[])
{
if(argc <= 2)
{
printf("usage ip prort \n", basename(argv[0]));
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 sock = socket(AF_INET,SOCK_STREAM,0);
bind(sock,(struct sockaddr*)&address,sizeof(address));
listen(sock,5);
struct sockaddr_in client;
socklen_t client_addrlength = sizeof(client);
int connfd = accept(sock,(struct sockaddr*)&client,&client_addrlength);
if(connfd < 0)
{
printf("errno is %d \n",errno);
}
else
{
int pipfd[2];
int ret = pipe(pipfd);
// 将connfd上流入的客户数据定向到管道中
ret = splice(connfd,NULL,pipfd[1],NULL,32768,SPLICE_F_MORE|SPLICE_F_MOVE);
assert(ret != -1);
ret = splice(pipfd[0],NULL,connfd,NULL,32768,SPLICE_F_MOVE|SPLICE_F_MORE);
assert(ret != -1);
close(connfd);
}
close(sock);
return 0;
}
/*
我们通过splice函数将客户端的内容读入到pipefd[1]中,然后再使
用splice函数从pipefd[0]中读出该内容到客户端,从而实现了简单高效
的回射服务。整个过程未执行recv/send操作,因此也未涉及用户空间和
内核空间之间的数据拷贝
* */