Re: C rename returns -1 but error text says no error exists

Hi Rick,

Reference service program QP0LLIB1 either directly on the compile or
by using a binding directory. This is where the Qp0lRenameUnlink is
exported from.

That's unnecessary. The system will automatically find QP0LLIB1 and bind to it. (Explicitly specifying QP0LLIB1 or a binding directory won't hurt anything -- but it's not necessary.)

The ILE binder will automatically find any system-supplied API. That is, any API that's part of the IBM i operating system. APIs that are part of ILE C, Apache, et al, would need to be bound to explicitly.

The IFS APIs are all part the Unix-type APIs category. They are not part of the ILE C Runtime. Therefore, the IFS APIs do not require any special binding.

Frustratingly, the IFS APIs do their error handling via the ILE C __errno function. This was presumably for compatibility with the way Unix does things -- but it's frustrating because it blurs the line between Unix-type and ILE C Runtime. FWIW, __errno() and strerror() are part of ILE C, and the APIs that actually manipulate the IFS are not.

In IBM i 6.1, IBM fixed this problem. You no longer need to bind to QC2LE to get __errno and strerror() in 6.1..

Anyway, the routines in the ILE C runtime _are_ APIs. They just are part of ILE C instead of being part of IBM i itself. An API is just a routine that provides a way to interface your program with another application...