it means you don't want to redefine a .h file On Mon, Jul 20, 2015 at 7:03 AM, Ahmed Soliman <ahmedsoliman0x666@xxxxxxxxx> 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 > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- ---------------------------------------------- Leônidas S. Barbosa (Kirotawa) blog: corecode.wordpress.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
