> I am writing a kernel module where I am trying to access the > task_structs. Now I have tried this using various mathods. > 1) Using the pidhash array. > Here when I do a insmod I get a unresolved symbol. Modules can only use kernel symbols that are explicitly made available to them (using EXPORT_SYMBOL()). If pidhash isn't exported, your module can't use it. > 2) Directly accessing the location of pidhash as seen in > System.map. > Here when the pidhash_fn hashes the supplied pid, the particular > location into which it indexes is NULL. I obtain the pid of the > process after a "ps -aux" Depending on System.map within a module isn't a good idea. It breaks the control provided by EXPORT_SYMBOL and adds unnecessary complexity (like finding the address of pidhash and passing it at the time of insmod). And how do you make sure the System.map you are using corresponds to the currently running kernel? > 3) Starting from the init_task. > Here the next task after the init task is found to be NULL. Sure you are using the right headers and following the proper link? In any case, the macro for_each_task() should get the job done for you. It also starts from init_task and follows the linked list. Hope this helps, Ravi. __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
