PIPE_WANTR
if (fpipe->pipe_state & PIPE_WANTR)
if ((cpipe->pipe_state & PIPE_WANTR)) {
cpipe->pipe_state &= ~PIPE_WANTR;
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
wpipe->pipe_state &= ~(PIPE_WANT | PIPE_WANTR);
if (wpipe->pipe_state & PIPE_WANTR) {
wpipe->pipe_state &= ~PIPE_WANTR;
rpipe->pipe_state |= PIPE_WANTR;