readdir() doesn't support d_type

[afalkenhahn]

Would be nice to have readdir() support d_type so that it is possible to distinguish between files and directories in a portable way.

[sba1]

Upcoming gcc 8 will also take advantage of readdir() with d_type support. @obarthel do you think that there are any problems with extending struct dirent with d_type?

[obarthel]

No, this should be both "harmless" and beneficial.

If I recall my Unix history correctly, only the smallest common subset of the vendor-specific dirent structure members was standardized in Unix/POSIX, which to this day makes it necessary to use readdir() with stat() and lstat(). The standard only guarantees the presence of a name and an inode number.

And we always thought that a 'struct FileInfoBlock' had its limitations ;-)

[ksdhans]

I just encountered this (with GCC 8.1.0). Newlib supports d_type, but not clib2. Given the current encouragement to switch from newlib to clib2, it would be great if this could be added.