std.fs.File: stat for windows is not consistent with POSIX and is missing some informations

[perillo]

The offending source code is: https://github.com/ziglang/zig/blob/779b8e2/lib/std/fs/File.zig#L373.

Note that I'm not an expert of Windows, however I think that the following issue should be fixed:

Using info.BasicInformation.CreationTime as ctime

In POSIX, ctime represent file metadata change. The equivalent of POSIX ctime is info.BasicInformation.ChangetimeTime, not CreationTime.

See https://devblogs.microsoft.com/oldnewthing/20100709-00/?p=13463 for an unofficial reference.

Supporting only kind of type .file or `.directory

Windows supports symbolic links in info.BasicInformation.FileAttributes and in info.StandardInformation.NumberOfLinks.
Zig should support them, if the semantic is compatible with POSIX.

Add birthtime to std.fs.File.Stat

Since Windows and some POSIX systems like Linux (ext4 and btrfs), BSD (ufs2) and Solaris (zfs) supports birthtime, Zig should add an optional birthtime field to Stat.

Thanks

[perillo]

Looking at https://github.com/ziglang/zig/blob/779b8e2/lib/std/fs/File.zig#L323, I believe that the first issue (CreationTime vs ChangeTime) is a serious error/oversight.

From a quick research using git, it seems the original culprit is @andrewrk in 6096dc5.