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

priv_policy, priv_policy_only, priv_policy_choice - check, report, and audit privileges

#include <sys/policy.h>
int priv_policy(const cred_t  *cr, int priv, int err,
     boolean_t flag, const char  *msg);

boolean_t priv_policy_only(const cred_t  *cr, int priv,
     boolean_t flag);

boolean_t priv_policy_choice(const cred_t  *cr, int priv,
     boolean_t flag);

illumos DDI specific (illumos DDI).

The credential to be checked.


The integer value of the privilege to test.


All zone privileges flag. Set to B_FALSE for most tests or B_TRUE if the operation requires the caller to have all available privileges in the zone.


The error code to return.


String that is added to the privilege debugging message if one is generated. NULL if no additional information is needed. Because the function name is included in the output, NULL is usually the best value to pass as a parameter.

These functions aid in privilege checking and privilege debugging.

The priv_policy(), priv_policy_only(), and priv_policy_choice() functions all check whether priv is asserted in the effective set of the credential. The special value PRIV_ALL tests for all privileges.

The priv_policy() function updates the ASU accounting flag and records the privilege used on success in the audit trail if the required privilege was not a basic privilege.

The priv_policy_only() function checks whether a privilege is asserted and has no side effects.

The priv_policy_choice() function behaves like priv_policy_only() but records the successfully used non-basic privileges in the audit trail.

On success, priv_policy() return 0. On failure it returns its parameter err.

On success, priv_policy_choice() and priv_policy_only() return 1, on failure both return 0.

This might be caused by any of the following:
The flags parameter is invalid.
The specified privilege does not exist.
The priv parameter contains invalid characters.


There is no room to allocate another privilege.


An attempt was made to allocate a privilege that was longer than {PRIVNAME_MAX} characters.

This functions can be called from user, interrupt, or kernel context.

See attributes(7) for a description of the following attributes:

Interface Stability Committed

acct(3HEAD), attributes(7), privileges(7)

Writing Device Drivers

April 3, 2009 OmniOS