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Date: Thu, 06 Mar 2008 07:02:33 -0700
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: bug with touch t/
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According to Corinna Vinschen on 3/6/2008 6:45 AM:
| SUSv3(*) says:
|
|   [EISDIR]
|     The named file is a directory and oflag includes O_WRONLY or O_RDWR.
|   [ENOENT]
|     O_CREAT is not set and the named file does not exist; or O_CREAT is
|     set and either the path prefix does not exist or the path argument
|     points to an empty string.
|
| Given these descriptions, I can't see anything wrong with that Linux
| behaviour.

By those SUSv3 rules (which are identical to POSIX), open("t/",
O_RDONLY|O_CREAT) when t does not exist falls under ENOENT, not EISDIR.
In POSIX 2004, path resolution requires that if a trailing slash is
present, resolution is performed as if by "t/.", making "t" a path prefix
which is not present.  And in the draft POSIX 200x, the wording has been
made more explicit that when doing path resolution, if there is a trailing
slash but the text before the slash does not name an existing directory,
then it fails with ENOENT.

But on Linux:
Linux$ strace touch t/
~  [...]
~  open("t/", O_WRONLY|O_NONBLOCK|O_CREAT|O_NOCTTY, 0666) = -1 EISDIR (Is a
directory)
~  futimesat(AT_FDCWD, "t/", NULL)         = -1 ENOENT (No such file or
directory)

Linux is returning the wrong errno for open, according to SUSv3/POSIX.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9 AT byu DOT net
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