19 Filenames 19.2 Pathnames 19.2.2 Interpreting Pathname Component Values 188.8.131.52 Restrictions on Examining Pathname Components
184.108.40.206.2 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 220.127.116.11 Restrictions on Wildcard Pathnames and Section 18.104.22.168 Restrictions on Constructing Pathnames.