更新时间:2023-11-14 08:43:04
EXPORT_SYMBOL()
是正确的方法.我不太明白您所说的如果我不包含通用头文件"是什么意思.听起来您将 EXPORT_SYMBOL()
包含在共享头文件中,这不是您想要做的.您想要执行以下操作:
EXPORT_SYMBOL()
is the correct approach. I do not quite understand what you mean by "if I don't include the common header file". It sounds like you are including the EXPORT_SYMBOL()
in a shared header file which is not what you want to do. You want to do something like the following:
module1.c(编译成module1.ko)
module1.c (compiles into module1.ko)
int my_exported_variable;
EXPORT_SYMBOL(my_exported_variable);
// The rest of module1.c
然后在module2.c中(编译成module2.ko,必须在module1.ko之后进行insmod-ed)
And then in module2.c (compiles into module2.ko which must be insmod-ed after module1.ko)
extern int my_exported_variable; // Note the extern, it is declaring but not defining it, the definition is in module1
// The rest of module2.c
在插入第一个模块后,您可以通过执行 grep my_exported_variable/proc/kallsyms
来检查符号是否已导出,假设您有 /proc/kallsyms
系统.如果您在那里没有看到您的变量,那么 module2.ko 的 insmod 将无法处理未解析的符号.
After you insmod the first module you can check that the symbol is exported by doing a grep my_exported_variable /proc/kallsyms
, assuming you have /proc/kallsyms
on your system. If you don't see your variable there then the insmod of module2.ko will fail do to an unresolved symbol.