找到問題了...
沒有東西被block掉
def reading():
while True:
scr=Conn.stdout.read(1)
drop=sys.stdout.buffer.write(scr)
=> drop=sys.stdout.flush() <=
DataIn=threading.Thread(target=reading)
DataIn.start()
在interactive shell裡寫東西到stdout,不用flush就看的到了
perhaps python implicitly flushed stdout before giving prompt.....
而且這個buffer不是OS的buffer...
看strace想了好久才搞定 = =" {
python先呼叫了select(),在interactive shell收到return後才write
而不是停在read(pipe)時}
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