Kernel Functions for Drivers                         drvpriv(9F)



NAME
     drvpriv - determine driver privilege

SYNOPSIS
     #include 
     #include 
     #include 



     int drvpriv(credt *cr);


INTERFACE LEVEL
     Architecture independent level 1 (DI/DKI).

PARAMETERS
     cr    Pointer to the user credential structure.


DESCRIPTION
     The drvpriv() function provides a general interface to  the
     system  privilege  policy. It determines whether the creden-
     tials supplied by the user credential structure  pointed  to
     by  cr  identify  a  process that has the {PRIVSYSDEVICES}
     privilege asserted  in  its  effective  set.  This  function
     should  be  used  only when file access modes, special minor
     device numbers, and the device  policy  (see  privileges(5),
     adddrv(1M))  are insufficient to provide protection for the
     requested driver function. It is  intended  to  replace  all
     calls  to suser() and any explicit checks for effective user
     ID = 0 in driver code.

RETURN VALUES
     This routine returns 0 if it succeeds, EPERM if it fails.

CONTEXT
     The drvpriv() function can be called from user,  interrupt,
     or kernel context.

SEE ALSO
     adddrv(1M), updatedrv(1M), privileges(5)


     Writing Device Drivers










SunOS 5.11          Last change: 16 Jan 2006                    1