about system call interception

Dragonfly

i have a question, why so many people here and on linuxsir want to intercept the system call from module. why need do this? to finish what function?
i do not know, can anybody tell me?

keenor

我想大家是想知道怎么做内核后门吧
呵呵
可能说得不对

Dragonfly

crazy.

keenor

不过我觉得通过截系统调用来学习怎么写模块进而尝试去看原代码似乎是一个方法
光看原代码不实际写点什么我觉得是不行的，我就坚持不下来。一般的同志也没有什么机会为新硬件写驱动，那一大堆驱动用的函数实在也没机会用，所以截个系统调用什么的玩玩还可以给自己一点成就感。
呵呵，实在是我的一点浅见。

Dragonfly

i do not think so, that is only a table
a = t[x];
t[x] = b;
is too simple, so no benefit for learning kernel source.

i give a topic. create a tcp server, read a string as file name, open the file, read content, and send content back to client via socket. can anybody write one module to do this?