bug#41001: mkdir: cannot create directory ‘test’: File exists

[Paul Eggert]

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.