[PATCH 11/11] dir.cc: Try unlink_nt first

[Ben]

On 18-01-2021 13:13, Corinna Vinschen via Cygwin-patches wrote:
> 
> Your code is skipping the safety checks and the has_dot_last_component()
> check.  The latter implements a check required by POSIX.  Skipping
> it introduces an incompatibility, see man 2 rmdir.
> 

Yes, I missed has_dot_last_component completely.

As for the other checks:
dir.cc: 404: fh->error ():
* Done in unlink_nt
dir.cc: 409: fh->exists ():
* Done in _unlink_nt through NtOpenFile, which will return either
  STATUS_OBJECT_NAME_NOT_FOUND or STATUS_OBJECT_PATH_NOT_FOUND,
  both of which resolve to ENOENT
dir.cc: 413: isdev_dev (fh->dev ()):
* Done in unlink_nt
fhandler_siak_file.cc: 1842:  if (!pc.isdir ())
* Done in _unlink_nt through NtOpenFile with flags FILE_DIRECTORY_FILE
  and FILE_NON_DIRECTORY_FILE which will return STATUS_NOT_A_DIRECTORY
  and STATUS_FILE_IS_A_DIRECTORY respectively.

Have I missed something else?

Also, I think it's better to have isdev_dev (fh->dev ()) return EROFS,
which is the same as unlink.