Symbol: PIPE_ASYNC
sys/kern/sys_pipe.c
1450
mpipe->pipe_state |= PIPE_ASYNC;
sys/kern/sys_pipe.c
1452
mpipe->pipe_state &= ~PIPE_ASYNC;
sys/kern/sys_pipe.c
720
if ((cpipe->pipe_state & PIPE_ASYNC) && cpipe->pipe_sigio)