keep track of file (fdesc) types, properly fill stat st_mode #580
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Previously, stat(2) and variants were only handling regular and directory file types and would barf on other fd types like sockets. This aims to clean up the tracking of types both internally (in struct fdesc) and in st_mode in struct stat. Some more hardening can be added to make sure that syscalls which take an fd are operating on the correct type of descriptor - I can add some of this before merging.
This should resolve #526 and #562.