[PATCH] posix: if glob has a trailing slash match directories only.

[Paul Eggert]

Dmitry Goncharov wrote:
> Paul, i am missing where you see the performance hit.
> The current contract makes the caller check after the library by calling stat
> on each entry.

No, these callers need not call stat. glob itself doesn't call stat, when it 
calls itself recursively with this flag. Instead, glob simply charges ahead and 
gets an ENOTDIR (or whatever( in the next level of recursion. For this sort of 
usage, it is a win for glob to filter out directories if that is easy (because 
there is then no need even to issue the syscalls that result in ENOTDIR), but it 
can be a loss for glob to filter out directories via stat calls.