linux 导出符号列表例子

转自：/article/3681947.html

--在网友基础上修改而来

模块1代码：

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#include<linux/init.h>

#include<linux/module.h>

MODULE_LICENSE("Dual BSD/GPL");

int test_global_value_1 = 0x55;

int test_global_value_2 = 0xaa;

EXPORT_SYMBOL(test_global_value_1);

EXPORT_SYMBOL(test_global_value_2);

static int __init symbol_init(void)

{

printk("<0> symbol_init\n");

return 0;

}

int add_integar(int a, int b)

{

return (a + b);

}

int sub_integar(int a, int b)

{

return (a - b);

}

static void __exit symbol_exit(void)

{

printk("<0> symbol_exit\n");

}

EXPORT_SYMBOL(add_integar);

EXPORT_SYMBOL(sub_integar);

module_init(symbol_init);

module_exit(symbol_exit);

模块2代码：

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#include<linux/module.h>

#include<linux/init.h>

extern int add_integar(int, int);

extern int sub_integar(int, int);

extern int test_global_value_1;

extern int test_global_value_2;

MODULE_LICENSE("GPL");

static int __init use_symbol_init(void)

{

printk("test_global_value_1 = %x\n", test_global_value_1);

printk("test_global_value_2 = %x\n", test_global_value_2);

printk("<0> use_symbol_init");

printk("<0> 1+2 = %d\n",add_integar(1,2));

printk("<0> 3-2 = %d\n",sub_integar(3,2));

return 0;

}

static void __exit use_symbol_exit(void)

{

printk("<0> Module exit!\n");

}

module_init(use_symbol_init);

module_exit(use_symbol_exit);