drv_priv(9F) Kernel Functions for Drivers drv_priv(9F)NAMEdrv_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
The drv_priv() function provides a general interface to the system
privilege policy. It determines whether the credentials supplied by the
user credential 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 insufficient to provide protection for the requested driver func‐
tion. 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 drv_priv() function can be called from user, interrupt, or kernel
context.
SEE ALSOadd_drv(1M), update_drv(1M), privileges(5)
Writing Device Drivers
SunOS 5.10 16 Jan 2006 drv_priv(9F)