CURSIG_NOBLOCK
if (CURSIG_NOBLOCK(lp1)) {
if (CURSIG_NOBLOCK(curthread->td_lwp) != 0) {
if ((sig = CURSIG_NOBLOCK(curthread->td_lwp)) != 0)
if (CURSIG_NOBLOCK(curthread->td_lwp) != 0)
if (CURSIG_NOBLOCK(curthread->td_lwp) != 0)