PRIV_DRIVER
error = priv_check(td, PRIV_DRIVER);
if ((error = priv_check(td, PRIV_DRIVER)))
if ((error = priv_check(td, PRIV_DRIVER)))
if ((error = priv_check(td, PRIV_DRIVER)))
error = priv_check(curthread, PRIV_DRIVER);
rc = priv_check(td, PRIV_DRIVER);
#define suser(...) priv_check(NULL, PRIV_DRIVER)