These interfaces verify the credentials of application threads making system calls into drivers. They are sometimes used in the open(9E) entry point to restrict access to a device, though this is usually achieved with the permissions on the special files in the file system.
int drv_priv(cred_t *credp);drv_priv(9F) returns zero if the credential structure pointed to by credp is that of a privileged thread. It returns EPERM otherwise. Use drv_priv(9F) only in place of calls to the obsolete suser() function and when making explicit checks of a calling thread's UID.
cred_t *ddi_get_cred (void);ddi_get_cred(9F) returns a pointer to the user credential structure of the the caller.