Directory entries enumeration - FindDirEntry ?

Hello,

I am porting my project to NSPR, and came to a showstopper, since I
need to enumerate the contents of a Directory, and can't find any API
for that. Maybe that's because these APO are intended to be used
transparently with sockets etc. but still there are some specific I/O
for the filesystem.

How can this be achieved in NSPR? (i.e. in Win32 there are
FindFile(...), FindNext(...), ... )

Thanks
Anton