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Re: Improve reporting of I/O, access errors for Emacs

From: Paul Eggert
Subject: Re: Improve reporting of I/O, access errors for Emacs
Date: Thu, 12 Sep 2019 11:27:28 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 9/12/19 11:04 AM, Eli Zaretskii wrote:
We should instead have such logic on higher levels, where the
semantics and the meaning of errors are clear.

If lower levels suppress the info, logic on higher levels cannot obtain the information and therefore cannot deal with the errors. So there must be some change to the lower levels, regardless of what changes might be advisable at higher levels.

if Emacs just needs
to return some information about a file, and the file turns out to be
inaccessible, why do we need to signal an error

The same reason insert-file-contents signals an error when a file is inaccessible: the requested information is not available, and this is an exceptional condition.

I should mention that I've been trying out the new code and it works fine for me. All tests pass. The exceptional conditions in question are rare in practice; I found them only because I was trying out some stress tests that didn't work right.

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