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based on an earlier version of the Wolfram Language.
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FilledSmallSquare$Input is a global variable whose value is the name of the stream from which input to Mathematica is currently being sought.

FilledSmallSquare During the execution of <<file, $Input is set to "file".

FilledSmallSquare During interactive input, $Input is "".

FilledSmallSquare See The Mathematica Book: Section 2.11.4 and Section 2.13.1.

FilledSmallSquare See also: Get, Streams, DirectoryName, ToFileName, $BatchInput, $ParentLink.