linux管道

//by [email protected]
#include<iostream>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include "stdio.h"
using std::cin;
using std::cout;
using std::endl;
int main()
{
	int fd[2];
	pid_t pid;
	char r_buffer[500];
	int len=0;
	if(pipe(fd)<0){
		cout<<"管道创建失败"<<endl;
		return 0;
	}
	if((pid=fork())==0){
		close(fd[1]);
		sleep(2);
		for(int i = 0;i<3;i++){
			len=read(fd[0],r_buffer,500);
			if(len>0){
				cout<<r_buffer<<endl;
				cout<<endl;
			}
		}
	}else if(pid>0){
		close(fd[0]);
		const char buffer[3][30]={"first: I am child !n ","second: How are you !n ","third: Good bye !n "};
		for(int i = 0;i<3;i++){
			write(len,buffer[i],30);
			sleep(3);
		}
	}else{
		cout<<"进程创建失败"<<endl;
		return 0;
	}
	return 0;
}