June 2001
Intermediate to advanced
592 pages
19h 20m
English
Content preview from Linux Device Drivers, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Quick Reference
This chapter introduced the following kernel symbols.
-
/etc/modules.conf This is the configuration file for modprobe and depmod. It is used to configure demand loading and is described in the manpages for the two programs.
-
#include <linux/kmod.h>,int request_module(const char *name); This function performs demand loading of modules.
-
void inter_module_register(const char *string, struct module *module, const void *data);,void inter_module_unregister(const char *); inter_module_register makes data available to other modules via the inter-module communication system. When the data is no longer to be shared, inter_module_unregister will end that availability.
-
const void *inter_module_get(const char *string);,const void *inter_module_get_request(const char *string, const char *module);,void inter_module_put(const char *string); The first two functions look up a string in the intermodule communication system; inter_module_get_request also attempts to load the given
moduleif the string is not found. Both increment the usage count of the module that exported the string; inter_module_put should be called to decrement it when the data pointer is no longer needed.-
#include <linux/config.h>,CONFIG_MODVERSIONS This macro is defined only if the current kernel has been compiled to support versioned symbols.
-
#ifdef MODVERSIONS,#include <linux/modversions.h> This header, which exists only if
CONFIG_MODVERSIONSis valid, contains the ...