pipe实现兄弟进程通信

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
int main()
{
	int fd[2];
	pipe(fd);
	pid_t pid = fork();
	if(pid==0)
	{
		close(fd[0]);
		write(fd[1],"Hello",6);
		exit(0);
		close(fd[1]);
	}
	pid_t pid2 = fork();
	char buf[6]={0};
	if(pid2==0)
	{
		close(fd[1]);
		read(fd[0],buf,6);
		printf(buf);
		close(fd[0]);
		exit(0);
	}
	else if(pid2>0)
	{
		close(fd[0]);
		close(fd[1]);
		exit(0);
	}
}