19 Filenames 19.2 Pathnames 19.2.2 Interpreting Pathname Component Values 220.127.116.11 Restrictions on Examining Pathname Components
18.104.22.168.2 Restrictions on Examining a Pathname Device Component
The device might be a string,
:wild, :unspecific, or nil.
Note that :wild might result from an attempt to read1
the pathname component, even though portable programs are restricted
from writing1 such a component value;
see Section 22.214.171.124 Restrictions on Wildcard Pathnames and Section 126.96.36.199 Restrictions on Constructing Pathnames.