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DEV_MKDB(8) System Manager's Manual DEV_MKDB(8)

create /dev database


The dev_mkdb command creates a hash(3) access method Berkeley 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.

device directory
database file

ps(1), stat(2), dbopen(3), devname(3), kvm_nlist(3), ttyname(3), kvm_mkdb(8)

The dev_mkdb command appeared in 4.4BSD.
November 30, 2015 OpenBSD-6.1