ERL-567: code:is_loaded/1: Filename is an absolute filename

[OTP-Maintainer]

Original reporter: sdl.web@gmail.com
Affected version: OTP-20.2
Component: kernel
Migrated from: https://bugs.erlang.org/browse/ERL-567

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{{code:is_loaded(yaws_dynopts)}} returns {code:erlang}{file, []}{code} which is not an absolute filename. yaws_dynopts is loaded using {{code:load_binary/3}}.

[OTP-Maintainer]

john said:

{{code:load_binary/3}} doesn't actually load anything from disk, and the {{Filename}} argument lets you specify which file you want the code server to believe you loaded the module from (for bookkeeping purposes).

Looking at the YAWS source code it passes an empty filename to {{code:load_binary/3}} when generating this module, so {{code:is_loaded/1}} will return an empty filename.

https://github.com/klacke/yaws/blob/80caa2b2a7608638046fdb00180fa79262a8f2a8/src/yaws_dynopts.erl#L180

[OTP-Maintainer]

sdl.web@gmail.com said:

Thanks for the quick response. That's what I understood too. Should the documentation of {{code:is_loaded/1}} be fixed?

[OTP-Maintainer]

john said:

Sure, I'll add a note saying you can't rely on the filename for anything more than debugging.

[OTP-Maintainer]

sdl.web@gmail.com said:

Thanks.