操作系统实验 进程软中断通信 编写一段程序，父进程创建一个子进程p1；并使子进程利用系统调用kill()向父进程发送信号，父进程得到信号后输出字符串“received p1 signal.” 。 -Experimental process, the operating system write a soft interrupt communication procedures, the parent creates a child process p1 and to the child pro