Jan Hudec <bulb@ucw.cz> schrieb am 05.12.03 11:21:30: >On Thu, Dec 04, 2003 at 21:34:43 +0100, threadhead@web.de wrote: >> hi! >> >> i've been been coding a LKM that should be >> able to use variables, that are declared as extern. >> i am using a 2.4.20 kernel. >> >> the module is based on some code of >> kernel/module.c. >> (http://lxr.linux.no/source/kernel/module.c) >> >> well, i tried different stuff with that LKM now. >> take as an example: >> i have the tulip module loaded. with my LKM i can make use of >> extern const char * const medianame[]; >> (http://lxr.linux.no/source/drivers/net/tulip/tulip.h) >> and display it, when using the same declaration in my LKM. >> >> but for some strange reason i cannot use >> variables that were declared a similar way in .c files in the >> kernel source tree. >> for example: >> extern const struct exception_table_entry __start___ex_table[]; (kernel/module.c) >> >> why can i access extern vars from header files and not >> from source C files, that have been compiled as >> part of my current kernel? > Only symbols declared EXPROT_SYMBOL (see kernel/ksyms.c) are available > to modules. Symbols defined by modules are exported by default unless > turned off. > ------------------------------------------------------------------------------- > Jan 'Bulb' Hudec <bulb@ucw.cz> Is there another way of accessing the structs in kernel/module.c that have been declared as extern with my module? like: extern struct module_symbol __start___ksymtab[]; extern struct module_symbol __stop___ksymtab[]; extern const struct exception_table_entry __start___ex_table[]; extern const struct exception_table_entry __stop___ex_table[]; extern const char __start___kallsyms[] __attribute__ ((weak)); extern const char __stop___kallsyms[] __attribute__ ((weak)); -- If no, why have they been declared as extern, if modules cannot access them? Thanks for your reply! ______________________________________________________________________________ WEB.DE FreeMail wird 5 Jahre jung! Feiern Sie mit uns und nutzen Sie die neuen Funktionen http://f.web.de/features/?mc=021130 -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
