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USB Power Delivery (or USB-PD): If your laptop, tablet, or other device doesn't have enough USB ports, you might be forced to choose between charging or plugging in accessories. USB-PD ports let you bridge this gap by plugging a charger into the hub to supply power to the laptop (and anything else connected to the hub that needs it. You'll see this referred to as “pass-through charging" though it's not an official specification. You'll want to make sure the wattage this USB-C port supports can handle what your laptop needs. A MacBook Pro typically needs 96 watts during intense workloads (though you can still charge them at lower wattage), so you'd need a 100-watt USB-C port on the hub.，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
if (setsockopt(nlsock, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) == -1) {