The
dev_mkdb
command creates a
db(3)
hash access method database in
“/var/run/dev.db”
which contains the names of all of the character and block special
files in the
“/dev”
directory, using the file type and the
st_rdev
field as the key.
Keys are a structure containing a
mode_t
followed by a
dev_t,
with any padding zeroed out.
The former is the type of the file
(st_mode & S_IFMT),
the latter is the
st_rdev
field.