Optional signal for Linux kernel modules

One. Optional signal for kernel modules

1. Module declaration

(1). Module_license (Compliance Agreement)

Affirm the license agreement that the module complies with, such as: "GPL", "GPL V2"

(2). Module_author (author)

Author of the Application module

(3). module_description (function description of the module)

Function of the application module

(4). Module_version (v1.0)

Version of the application module

2. Module parameters

　　　　The variable that holds the module parameter is specified by the macro Module_param. Module parameters are used to pass parameters to the module when the module is loaded.

Module_param (Name,type,perm)

#name: The name of the variable

#type: Variable type, BOOL: Boolean int: Integral type charp: String type

#perm是访问权限. S_irugo: Read permission s_iwusr: Write permission

#例:

int a = 3;

Char *st;

Module_param (A,int, S_irugo);

Module_param (St,charp, S_irugo);

3. Symbol output (export the symbol inside the kernel module, the output value can be called by other kernel modules)

Export of kernel symbols using macros

Export_symbol (symbol name)

EXPORT_SYMBOL_GPL (symbol name)

Description: Where EXPORT_SYMBOL_GPL can only be used for modules that contain GPL licenses.

　　

Optional signal for Linux kernel modules