Symbol: PIPE_ASYNC
sys/kern/sys_pipe.c
1013
atomic_set_int(&rpb->state, PIPE_ASYNC);
sys/kern/sys_pipe.c
1015
atomic_clear_int(&rpb->state, PIPE_ASYNC);
sys/kern/sys_pipe.c
211
if (dosigio && (pb->state & PIPE_ASYNC) && pb->sigio) {