[Python-Dev] Issue 11406: adding os.scandir(), a directory iterator returning stat-like info
solipsis at pitrou.net
Fri May 10 15:54:11 CEST 2013
Le Fri, 10 May 2013 15:46:21 +0200,
Christian Heimes <christian at python.org> a écrit :
> Am 10.05.2013 14:16, schrieb Antoine Pitrou:
> > But what if some systems return more than the file type and less
> > than a full stat result? The general problem is POSIX's terrible
> > inertia. I feel that a stat result with some None fields would be
> > an acceptable compromise here.
> POSIX only defines the d_ino and d_name members of struct dirent.
> Linux, BSD and probably some other platforms also happen to provide
> d_type. The other members of struct dirent (d_reclen, d_namlen)
> aren't useful in Python space by themselves.
> d_type and st_mode aren't compatible in any way. As you know st_mode
> also contains POSIX permission information. The file type is encoded
> with a different set of bits, too. Future file types aren't mapped to
> S_IF* constants for st_mode.
Thank you and Ronald for clarifying. This does make the API design a
bit bothersome. We want to expose as much information as possible in a
cross-platform way and with a flexible granularity, but doing so might
require a gazillion of namedtuple fields (platonically, as much as one
field per stat bit).
> For d_ino you also need the device number from the directory because
> the inode is only unique within a device.
But hopefully you've already stat'ed the directory ;)
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