[Linux][Kernel introduce] System Call

[Linux][Kernel introduce] System Call

1. Process Management : build up new process , query information , debug.

2. Signal                             : send signal , counter ,

3. File                                  : create ` open and close file,

4. Directory and Filesystem : create ` delete and rename , query information ` link up ` change directory

5. Protection Mechanics : read and change UID/GID

6. Counter Function : counter function and caculate information.