MSG_R
if (error = ipcperm_access(&qp->msg_perm, MSG_R, cr)) {
if (error = ipcperm_access(&qp->msg_perm, MSG_R, CRED())) {
if (error = ipcperm_access(&qp->msg_perm, MSG_R, CRED())) {
ASSERT((mode & (MSG_R|MSG_W)) != 0);
if ((mode & MSG_R) &&
ASSERT((mode & (MSG_R|MSG_W)) != 0);
if ((mode & MSG_R) &&