Date: Wed, 12 Sep 2012 17:20:15 GMT From: Eric Blake <eblake@redhat.com> To: freebsd-standards@FreeBSD.org Subject: Re: standards/171577: realpath(3) returns ENOTDIR instead of ENOENT Message-ID: <201209121720.q8CHKFln069120@freefall.freebsd.org>
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The following reply was made to PR standards/171577; it has been noted by GNATS.
From: Eric Blake <eblake@redhat.com>
To: bug-followup@FreeBSD.org, emaste@FreeBSD.org,
Andrey Chernov <ache@FreeBSD.org>
Cc:
Subject: Re: standards/171577: realpath(3) returns ENOTDIR instead of ENOENT
Date: Wed, 12 Sep 2012 11:15:53 -0600
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>> ENOTDIR is
>>=20
>> 20 ENOTDIR Not a directory. A component of the specified pathnam=
e
>> existed, but it was not a directory, when a directory was=
>> expected.
>>=20
>> >How-To-Repeat:
>>=20
>> feynman% realpath /does-not-exist/foo
>> realpath: /does-not-exist/foo: Not a directory
>=20
> It works as designed. See POSIX realpath ERRORS section
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html=
>=20
> [ENOENT]
> A component of file_name does not name an existing file or file_name
> points to an empty string.
> [ENOTDIR]
> A component of the path prefix is not a directory, or the file_name
> argument contains at least one non- <slash> character and ends with one=
or
> more trailing <slash> characters and the last pathname component names =
an
> existing file that is neither a directory nor a symbolic link to a
> directory.
Andrey, you are arguing that since /does-not-exist is missing, it is not
a directory; but the POSIX wording for ENOENT vs. ENOTDIR is quite clear:=
http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#=
tag_15_03
[ENOENT]
No such file or directory. A component of a specified pathname does
not exist, or the pathname is an empty string.
[ENOTDIR]
Not a directory. A component of the specified pathname exists, but
it is not a directory, when a directory was expected.
In this particular case of /does-not-exist/foo, '/does-not-exist' is a
path component that does not exist (ENOENT applies), but is NOT a case
of a component that exists but is not a directory where a directory was
expected (ENOTDIR does not apply). Ed's patch looks correct to me.
--=20
Eric Blake eblake@redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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