#include?
#include?
#include?
#include?
#include?
#define?BUFSIZE?PIPE_BUF??/*?PIPE_BUF：管道默認一次性讀寫的數據長度*/

void?err_quit（char?*?msg）
{
????printf?（?msg?）;
????exit（1）;
}

int?main（void）
{
????int?fd[2];
????char?buf[BUFSIZE]?=?“hello?my?brother!\n“;????????/*?緩沖區?*/
????pid_t?pid;
????int?len;
????if?（?（pipe（fd））?????{
????????err_quit（“pipe?failed\n“）;
????}
????if?（?（pid?=?fork（））?????{
????????err_quit（“fork?failed\n“）;
????}
????else?if?（?pid?==?0?）????????????/*子進程中*/
	{
????????close?（?fd[0]?）;????????????????/*關閉不使用的文件描述符*/
????????write（fd[1]?buf?strlen（buf））;????/*寫入消息*/
????????exit（0）;
????}
????if?（?（pid?=?fork（））?