it means you don't want to redefine a .h file On Mon, Jul 20, 2015 at 7:03 AM, Ahmed Soliman <ahmedsoliman0x666@gmail.com> wrote:
currently I started reading through the linux kernel and I started reading liunx/include/linux/list.h> I understood some of the functions but still I dont know what does these lines of code do #ifndef _LINUX_LIST_H #define _LINUX_LIST_H which exist at the very beginning of the file I also noticed that there is many similar ifndefs in almost any .h file in the kernel note that I understand wnat does ifndef do bu I dont understand what goal is it supposed to achieve at the beginning of the headerfile
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