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   lsof    ( 8 )

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SYSTEM-WIDE DEVICE CACHE PATH

The local system administrator may choose to have a system-wide
       device cache file when building lsof.  That file will generally
       be constructed by a special system administration procedure when
       the system is booted or when the contents of /dev or /devices)
       changes.  If defined, it is lsof's third device cache file path
       choice.

       You can tell that a system-wide device cache file is in effect
       for your local installation by examining the lsof help option
       output - i.e., the output from the -h or -?  option.

       Lsof will never write to the system-wide device cache file path
       by default.  It must be explicitly named with a -D function in a
       root-owned procedure.  Once the file has been written, the
       procedure must change its permission modes to 0644 (owner-read
       and owner-write, group-read, and other-read).