Question

Say I write a libx.so, it contains 3 functions,

void bar();
void foo();
void spam();

Then I use ctypes to access it,

>>>libx = ctypes.CDLL("./libx.so")
>>>dir(libx)
...

But how can I know how many functions libx.so exports and what are they?

Answer 1

You can use nm libx.so on the shell to view the symbols exported by the library.

However, reading its docs/header file is usually a much better idea – the symbol list will not give you any information about the arguments and return values of the functions.