netbsd man page for drv_priv

drv_priv(9F)						   Kernel Functions for Drivers 					      drv_priv(9F)

NAME
       drv_priv - determine driver privilege

SYNOPSIS
       #include <sys/types.h>
       #include <sys/cred.h>
       #include <sys/ddi.h>

       int drv_priv(cred_t *cr);

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

PARAMETERS
       cr	Pointer to the user credential structure.

DESCRIPTION
       drv_priv()  provides a general interface to the system privilege policy. It determines whether the credentials supplied by the user creden-
       tial structure pointed to by cr identify a process that has the {PRIV_SYS_DEVICES} 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), add_drv(1M)) are insuf-
       ficient 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
       drv_priv() can be called from user or interrupt context.

SEE ALSO
       add_drv(1M), update_drv(1M), privileges(5)

       Writing Device Drivers

SunOS 5.10							    29 Jan 2003 						      drv_priv(9F)