A Method for interpreting the Linux kernel source code

An entry method for interpreting the Linux kernel source code-general Linux technology-Linux programming and kernel information. For more information, see the following. Several system calls, including putpmsg, do not perform any operation, that is, air conditioners to be expanded;

However, they still occupy sys_call_table table items. It is estimated that they were arranged by the designers to facilitate the expansion of system calls;

Therefore, you only need to add the corresponding service routines (for example, add the service routines getmsg or putpmsg) to increase system calls.

Conclusion: Of course, for a large and complex linux

In terms of the kernel, an article is far from enough, and the Code related to system calls is only an extremely small part of the kernel; but it is important to have a method and a good grasp of the analysis method; therefore, the analysis is only a guiding function, and the readers still need to make their own efforts.