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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Throwing error if process started with call-process returns error
	exit code
Date: Thu, 19 Jul 2018 20:43:47 +0300
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> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Thu, 19 Jul 2018 13:39:55 -0400
> 
> What's the canonical way to check if the process initiated using
> call-process failed?

The usual method is to examine the return value of call-process.