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Èç¹û°´ÏÂÃæµÄ´úÂë,ÔÚLinuxϵͳÏÂÔËÐÐ,
ÔÚ5ÃëÄÚ°´ÏÂ"ctrl + c"²úÉúÖжϵĽá¹ûÊÇ:
This is parent process, pid = Ò»¸öÕûÊý,
This is child process 1 pid = Ò»¸öÕûÊý,
This is child process 2 pid = Ò»¸öÕûÊý,
Parent process will be killed, The children will be killed first!
Õâ¸ö½á¹ûÎÒÖªµÀ...
----------------------------------------------------------------------------


ÏÖÔÚÎҰѺ¯Êýparent_stop()ÖÐµÄ "exit(0);" È¥µô,
È»ºóҲͬÑùµÄÔËÐÐʱ°´ÏÂ"ctrl + c"²úÉúÖжÏ,
Ö´ÐеĽá¹ûÊÇÕâÑùµÄ:
This is parent process, pid = Ò»¸öÕûÊý,
This is child process 1 pid = Ò»¸öÕûÊý,
This is child process 2 pid = Ò»¸öÕûÊý,
Parent process will be killed, The children will be killed first!
Parent process (pid = Ò»¸öÕûÊý) finished!          //±ÈÉÏÃæµÄ½á¹û¶à³öÀ´µÄ
-----------------------------------------------------------------------------------


´òÓ¡³öÀ´ÁËÕâ¾ä:Parent process (pid = Ò»¸öÕûÊý) finished! 
˵Ã÷ÔÚÖ´ÐÐparent_stopºó,³ÌÐò·µ»Ø,Ö´ÐÐÏÂÃæÓï¾ä
C/C++ code:
kill(pid1, SIGUSR1);
kill(pid2, SIGUSR2);
wait(0);
wait(0);
printf("Parent process (pid = %d) finished!\n", getpid());
exit(0);

ÎÒ²»Ã÷°×µÄÊÇ,ΪʲôִÐÐÁË
kill(pid1, SIGUSR1);
kill(pid2, SIGUSR2


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