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Linux中EXPORT_SYMBOL的用法 zt

工作和技术 crifan 814浏览 0评论

Linux中EXPORT_SYMBOL的用法 zt


EXPORT_SYMBOL标签内定义的函数对全部内核代码公开,不用修改内核代码就可以在您的内核模块中直接调用。您还可以手工修改内核源代码来导出另外的函数,用于重新编译并加载新内核后的测试。

Linux symbol export method:

[1] If we want export the symbol in a module, just use the EXPORT_SYMBOL(xxxx) in the C or H file.
    And compile the module by adding the compile flag -DEXPORT_SYMTAB.
    Then we can use the xxxx in the other module.

[2] If we want export some symbol in Kernel that is not in a module such as xxxx in the /arch/ppc/fec.c.
    Firstly, define the xxxx
in the fec.c;
    Secondly, make a new file which contain the "extern" define the
xxxx(for example, extern int xxxx
);
    Lastly, in the ppc_ksyms.c we includes the new file, and add the EXPORT_SYMBOL(
xxxx
).
    Then we can use the
xxxx.

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