On Friday 25 August 2006 16:16, suman adak wrote: > Hi list, > > I just tried to read a file from kernel space. I called sys_open()..but > when i try to load the module , it is saying sys_open undefined. > I can see in System.map file that this symbol has been exported.Why my > module is saying like that? Can anybody help me why this error message > comes ?or did i do any mistake.. > ... > Error output: > > Building modules, stage 2. > MODPOST > *** Warning: "sys_open" > [/home/suman/amit_saha/amit/read_file/my_module/read_file_module.ko] > undefined! > > P.S: Please don't tell the it is not good to use sys_open.. I know ..just i > want to see In order to access kernel symbols (functions, global variables) from a kernel module, they need to be exported. Since accessing sys_* functions from modules is wrong, the kernel does not export these kinds of functions. If you really want to play with them, you need to modify and recompile the kernel (see EXPORT_SYMBOL). tavi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
