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From: hammer@uiucdcsb.UUCP
Newsgroups: comp.emacs
Subject: Re: gnuemacs quesion: what does (put 'x
Message-ID: <165400023@uiucdcsb>
Date: Tue, 1-Sep-87 11:47:00 EDT
Article-I.D.: uiucdcsb.165400023
Posted: Tue Sep  1 11:47:00 1987
Date-Received: Fri, 4-Sep-87 00:46:40 EDT
References: <740@hplabsz.HPL.HP.COM>
Lines: 44
Nf-ID: #R:hplabsz.HPL.HP.COM:740:uiucdcsb:165400023:000:1657
Nf-From: uiucdcsb.cs.uiuc.edu!hammer    Sep  1 10:47:00 1987


/* Written  8:12 pm  Aug 30, 1987 by mayer@hplabsz.HPL.HP.COM in uiucdcsb:comp.emacs */
/* ---------- "gnuemacs quesion: what does (put 'x" ---------- */

<...>
Oh yeah, and while I've got your attention let me ask another question:
what is it about the buffers created by shell-command, dired, etc. that allows
kill-buffer to delete the buffer without querying the user with
"Buffer xyzzy modified; kill anyway?". If one evals buffer-modified-p
in that buffer, it will return 't', yet kill-buffer rightly kills these
buffers without asking.

<...>
kill-buffer does
	  /* Make sure b->text.modified is correct
	     even if buffer is selected now.  */
	  bf_cur->text.modified = bf_modified;
	
	  if (INTERACTIVE && !NULL (b->filename)
	      && b->text.modified > b->save_modified)
	    {
	      tem = Fyes_or_no_p (format1 ("Buffer %s modified; kill anyway? ",
					   XSTRING (b->name)->data));
	      if (NULL (tem))
		return Qnil;
	    }
in order to query the user about killing a modified buffer.


-- Niels Mayer
   Hewlett-Packard Laboratories.

PS: Please post any followups to this article. There's no point in keeping
this information a secret.
/* End of text from uiucdcsb:comp.emacs */

You answered your own question.  A *shell* buffer (for example) has no
associated file, so b->filename is null.

                                    David Hammerslag
                                    University of Illinois at Urbana-Champaign
                                    hammer@a.cs.uiuc.edu	    (ARPA)
                                    hammer@uiuc.csnet		    (CSNET)
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