This chapter introduced the following kernel symbols:
- /etc/modules.conf
The configuration file for modprobe and depmod. It is used to configure demand loading and is described in the man pages for the two programs.
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#include <linux/kerneld.h>,int request_module(const char *name);,int release_module(const char *name, int waitflag);,int delayed_release_module(const char *name);,int cancel_release_module(const char *name); These functions perform demand loading of modules by means of the kerneld daemon.
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#include <linux/autoconf.h>,CONFIG_MODVERSIONS This macro is defined only if the current kernel has been compiled to support versioned symbols.
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#ifdef MODVERSIONS,#include <linux/modversions.h> This header, which exists only if
CONFIG_MODVERSIONSis valid, contains the versioned names for all the symbols exported by the kernel.-
EXPORT_SYMTAB If version support is used, this macro must be defined if your module uses register_symtab to export symbols of its own.
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__GENKSYMS__ This macro is defined by make when preprocessing files to be read by genksyms to build new version codes. It is used to conditionally prevent inclusion of
<linux/modversions.h>when building new checksums.-
int set_persist(char *key, void *value, size_t length);,int get_persist(char *key, void *value, size_t length); Support for persistent storage of module data relies on these two functions, which are defined in
<linux/kerneld.h>.