#include?
#include?
#include?
#include?
#include?


//聲明全局變量
int?p1p2;
int?fd[2];

//中斷信號處理函數(shù)
void?sig_handler（int?sig_no）
{
????if（sig_no?==?SIGINT）
????{
????????kill（p1SIGUSR1）;//給子進程p1發(fā)信號
????????kill（p2SIGUSR1）;//給子進程p2發(fā)信號
????}
}
void?sh（int?sig_no）
{
????close（fd[0]）;
????close（fd[1]）;
????if（p1?==?0?&&?sig_no?==?SIGUSR1）//子進程p1退出
????{
????????printf（“Child?Process1?is?killed?by?Parent!\n“）;
????????exit（0）;
????}
????if（p2?==?0?&&?sig_no?==?SIGUSR1）//子進程p2退出
????{
????????printf（“Child?Process2?is?killed?by?Parent!\n“）;
????????exit（0）;
????}
}

int?main（void）
{
????char?buf[100];
????char?recive[100];
????int?x?=?1;//計數(shù)變量
????if（pipe（fd）?????{
????????perror（“Fail?to?create?pipe.\n“）;
????????exit（0）;
????}
????signal（SIGINTsig_handler）;//中斷信號
????while（（p1?=?fork（））==-1）;//創(chuàng)建子進程p1
????if（p1?==?0）//子進程p1
????{
????????signal（SIGINTSIG_IGN）;
????????signal（SIGUSR1sh）;
????????while（1）{
????????????close（fd[0]）;
????????????sprintf（recive“I?send?you?%d?times.“x）;
????????????write（fd[1]recive30）;
????????????x++;
????????????sleep（1）;
????????}
????}
????else?if（p1?>0）//返回父進程
????{
????????while（（p2?=?fork（））==-1）;
????????if（p2?==?0）//子進程p2
????????{
??
????????????signal（SIGINTSIG_IGN）;
????????????signal（SIGUSR1sh）;
????????????while（1）{
????????????????close（fd[1]）;
????????????????read（fd[0]buf40）;
????????????????printf（“%s\n“buf）;
????????????}
????????}
	//父進程等待子進程p1p2退出
????????waitpid（p1NULL0）;
????????waitpid（p2NULL0）;

????????close（fd[0]）;
????????close（fd[1]）;
????????printf（“Parent?Process?is?killed!\n“）;
????}
????return?0;
}