GNU bug report logs - #41001
mkdir: cannot create directory ‘test’: File exists

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Jonny Grant <jg <at> jguk.org>
Cc: 41001 <at> debbugs.gnu.org, Eric Blake <eblake <at> redhat.com>
Subject: bug#41001: mkdir: cannot create directory ‘test’: File exists
Date: Fri, 1 May 2020 13:32:19 -0700

On 5/1/20 1:21 PM, Jonny Grant wrote:
> yes, the fix pretty trivial for mkdir as you highlight EISDIR:
> stat(), S_ISDIR(sb.st_mode), and set errno to EISDIR or output strerror(EISDIR)

That would introduce a race condition, and wouldn't behave correctly if some
other process changes the destination from a regular file to a directory between
the time we call mkdir and the time that we call stat.

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