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   lsof    ( 8 )

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DEVICE CACHE PATH FROM AN ENVIRONMENT VARIABLE

Lsof's second choice for the device cache file is the contents of
       the LSOFDEVCACHE environment variable.  It avoids this choice if
       the lsof process is setuid-root, or the real UID of the process
       is root.

       A further restriction applies to a device cache file path taken
       from the LSOFDEVCACHE environment variable: lsof will not write a
       device cache file to the path if the lsof process doesn't
       surrender its setgid permission.  (See the LSOF PERMISSIONS THAT
       AFFECT DEVICE CACHE FILE ACCESS section for information on
       implementations that don't surrender their setgid permission.)

       The local system administrator can disable the use of the
       LSOFDEVCACHE environment variable or change its name when
       building lsof.  Consult the output of -D?  for the environment
       variable's name.