本文探讨了使用dlopen从库中加载函数时导致程序崩溃的问题，原因是链接器未导出必要的sockfd符号。文章提供了通过添加-rdynamic和-Wl,--export-dynamic参数来解决此问题的方法。
In the program, it will use dlopen to get a function from a library. And the sockfd is defined in the main progrm, so when the function in the library execute, it caused a crash!
That is because the ld doesn't export the sockfd.
The solution is add the following parameters when compiling:
-rdynamic -Wl,--export-dynamic
-rdynamic
Pass the flag -export-dynamic to the ELF linker, on targets that support it. This instructs the linker to add all symbols, not only used ones, to the
dynamic symbol table. This option is needed for some uses of "dlopen" or to allow obtaining backtraces from within a program.
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