The keyword is 'include guard' ~frukto Am 20.07.2015 um 17:55 schrieb leo kirotawa: > 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 > > > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
