If write returned zero, register the channel for OP_WRITE, remember the buffer somehow, and keep selecting.
如果写返回零，OP _ WRITE注册通道，记得缓冲区，并保持选择。
Each channel has a distinct electronic alarm and visual indicator when zero is reached.
每个通道配有不同的电子警报和视觉指示，在达到零秒时便会发出警报和指示。
Each channel has a distinct electronic alarm and visual indicator when zero is reached.
每个通道配有不同的电子警报和视觉指示，在达到零秒时便会发出警报和指示。
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