linux--函数劫持--基于LD_PRELOAD

        Recently i am facing a problem, how to differentiate a problem of library-function from application problems.for solving this problem, we need to know some knowledge about share-library and basics in Linux.For dynamic libraries, they are loaded to memory at program running. There are many benefits for this.On the other hand, we have a chance to do something. For example: replace the function, which will be loaded,as our function.Usually,this is maybe a very professional problem, at least for me.But thanks for some  masters, they have been provide a mature way to our goal.        Recently i am facing a problem, how to