How do I know when to cleanup the stack

Question

I have a function in C & C++ that looks like:

__declspec(dllexport) bool CreateSocket(SSLSocket* ssl_info);

I believe that by default should use the cdecl calling convention.

If in assembly I import the module and do:

push sockinfo
call [CreateSocket]

Do I have to do: add esp, 0x04 to restore the stack? Or is it restored automatically because it is an imported function? I ask this because for printf which is cdecl convention and imported, I have to clean up the stack myself. For WINAPI I don't have to do that.

Do I have to do this for exported/all functions or just for functions I write myself?

Answer 1

The cleanup responsibility is the same whether the function is imported or integrated in the calling module. It's the calling convention alone that dictates who should do the cleanup.