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we also include some head file in our C file? like this 

#include <signal.h> #include <malloc.h>

these file are all in /usr/include. however, where are these file in /usr/include/ from? Are them from Linux kernel Code Or gcc?

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They both come from GlibC; usually kernel header files are in /usr/include/linux and other subdirs, while gcc includes are located elsewhere (like /usr/lib/<arch>/<version>/include)

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