管道pipe

#include <sys/types.h>
#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc,char*argv[])
{
int arrfd[2]={0};//文件描述符
int ret = 0;
pid_t cid;//子进程id号

ret=pipe(arrfd);//创建管道
if (ret!=0)
{
	printf("create pipe failed\n");
	return 1;
}
cid=fork();
if(cid<0)
{
	printf("fork failed\n");
	close(arrfd[0]);
	close(arrfd[1]);
	return 2;
}
else if (cid==0)
{
	close(arrfd[1]);//fd[1] 写
	char buf[64]={0};
	while(1)
	{
	read(arrfd[0],buf,64);
	if(strncmp(buf,"exit",4)==0)
	{
		break;
	}
	printf("child process :%s",buf);
	}
	close(arrfd[0]);
}
else
{
	char buf[64]={0};
	close(arrfd[0]);
	while(1)
	{
	printf("process in parent:\n");
	fgets(buf,sizeof(buf),stdin);
	if(strncmp(buf,"exit",4)==0)
	{
		break;
	}
	write(arrfd[1],buf,sizeof(buf));
	
	}
		close(arrfd[1]);
}
return 0;

}