+ /* check the value */
+ if (!strcmp(params->value, string_required))
+ optional = !required;
+ else if (!strcmp(params->value, string_optional))
+ optional = 1;
+ else {
+ ERROR("unexpected parameter value: %s found for %s", params->value, params->name);
+ errno = EPERM;
+ return -1;
+ }
+ /* set the permission */
+ if (request_permission(params->name)) {
+ DEBUG("granted permission: %s", params->name);
+ } else if (optional) {
+ INFO("optional permission ungranted: %s", params->name);
+ } else {
+ ERROR("ungranted permission required: %s", params->name);
+ errno = EPERM;
+ return -1;
+ }