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Re: [Nano-devel] [PATCH 3/3] files: check for an empty FIFO before block

From: Benno Schulenberg
Subject: Re: [Nano-devel] [PATCH 3/3] files: check for an empty FIFO before blocking on it
Date: Wed, 15 May 2019 20:45:49 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Op 14-05-19 om 07:59 schreef Brand Huntsman:
> The open() in open_file() blocks if an empty FIFO is opened, causing nano to 
> hang.

Strange...  I remember seeing a "Reading File" message while it was waiting
for data to appear.  But obviously I must be misremembering that.

> This patch opens the FIFO in non-blocking mode, polls it for data and
> re-opens it in blocking mode if data found. Just start the writing process
> first, and then open nano.

I want it to be possible to open nano before the writing process has started.
When a FIFO is used, the result shouldn't depend on the particular order of
starting things.

> It would also be nice if a "Writing to FIFO..." message was displayed before 
> writing to one.

Yes, that is a good idea.  And "Reading from FIFO..." could be shown before
the open() is called.

> It would provide a little feedback as to why nano hangs if the FIFO is no 
> longer listening.

Or not yet listening.


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