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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: How does Emacs find the buffer for a file?
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On Sat, 15 Jun 2002 Kai.Grossjohann@CS.Uni-Dortmund.DE wrote:

> When you do C-x C-f /some/file RET, then Emacs runs
> insert-file-contents and puts the output in some buffer.  How does
> Emacs determine the buffer from the filename?

See buffer.c:Fget_file_buffer.  It is called by find-file-noselect, a 
subroutine of find-file.