如何在C一定时限后准确杀死子进程？

I've been attempting to write a program that can accurately kill a forked process after the child exceeds a certain running time. The process should be spawned from an executable on the disk. I am using linux, here. Let's not even consider the ugliness of simply forking a process on Windows (I feel sorry for whoever has to maintain the Windows source code.)I've been attempting to write a program that ca