本文共 713 字，大约阅读时间需要 2 分钟。
Linux中EXPORT_SYMBOL的用发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.
转载地址：http://penfb.baihongyu.com/