DTYPE_PIPE
|| (fp1->f_type == DTYPE_PIPE))
if (fp->f_type == DTYPE_PIPE)
rf->f_type = DTYPE_PIPE;
wf->f_type = DTYPE_PIPE;
case DTYPE_PIPE:
case DTYPE_PIPE:
case DTYPE_PIPE: return DT_FIFO;
case DTYPE_PIPE: