创建两个子进程，在进程执行中让父进程捕获键盘上传来的中断信号。

当多捕捉到中断信号后，父进程向两个子进程发出信号，子进程捕捉到该信号后分别输出：

（1）“child process1 is killed by parent！”

（2）“child process2 is killed by parent！”

-Create two sub-processes, in the process of implementation so that the parent process to capture the keyboard interrupt signals upload. Interrupt signal when the multi-capture, the parent process signals to the two sub-processes, sub-process to capture the output of the signal are: (1) " child process1 is killed by parent!"　(2) " child process2 is killed by parent! "