The pthread_mutexattr_getprioceiling() function returns the current prioceiling of the mutex. If successful, the pthread_mutex_getprioceiling() function shall return zero; otherwise, an error number shall be returned to indicate the error. The pthread_mutex_setprioceiling() function shall fail if: i. [EINVAL] The protocol attribute of mutex is PTHREAD_PRIO_NONE. ii. [EPERM] The implementation requires appropriate privileges to perform the operation and the caller does not have appropriate privileges. These functions shall not return an error code of [EINTR].