What is kernel-layer programming? -- Linux general technology-Linux programming and kernel information. The following is a detailed description. Recently, I was working on a linux system security issue. The program must be used only at the kernel layer. in the past, I had little access to linux and did not quite understand the concept of the kernel layer, (Do not copy all the definitions that can be found). do you mean that when writing a program, I can only call the functions defined in the kernel directory, but cannot call the header files in usr/include ??? However, I have also seen header files in usr/include/in some program source code (kernel-level), such as # include <stdint. h>. why?
How many practical functions can be used at the kernel layer, such as scanf and sprintf? If not, how can we implement the same functions?
(You may not be clear about many concepts that you are not familiar with. please give me some advice)
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