bug#22096: 25.0.50; reading from fifo breaks display

[Mark Oteiza]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Sat, 5 Dec 2015 12:09:08 -0500
>> From: Mark Oteiza <mvoteiza@udel.edu>
>> Cc: 22096@debbugs.gnu.org
>> 
>> On 05/12/15 at 06:45pm, Eli Zaretskii wrote:
>> > > From: Mark Oteiza <mvoteiza@udel.edu>
>> > > Date: Sat, 05 Dec 2015 10:58:38 -0500
>> > > 
>> > > > Anyway, you are reading a binary byte stream from an audio daemon, so
>> > > > I think you cannot expect it to be displayed in any human-readable
>> > > > way, let alone hope that the major mode in effect in *scratch will be
>> > > > able to fontify it in some reasonable way.  You should use
>> > > > insert-file-contents-literally instead, I think.  (And I very much
>> > > > doubt that "visiting" a non-regular file makes sense, but maybe I'm
>> > > > missing something.)
>> > > 
>> > > Right, I didn't expect VISIT=t to make sense, but the resulting breakage
>> > > is unexpected.
>> > 
>> > Emacs tries to decode the binary stream (unless you use the -literally
>> > variant), and the result could look (to Emacs) like some text that
>> > fits some font-locking or paren-matching pattern.
>> 
>> The same display oddity does still happen with
>> 
>> (insert-file-contents-literally "/tmp/mpd.fifo" t 0 10 nil)
>> 
>> and nothing appears to be inserted
>
> What is the value returned by the function?

It doesn't return, just errors on "not a regular file". Sorry for not
clarifying that.