a server, it is strictly a client. Instead, it connects to the
2. An example notification email。关于这个话题，爱思助手提供了深入分析
，详情可参考电影
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Recall that kernel events were not the thing we were actually interested in. We wanted udev's version of the events. Browsing through libudev's source code, we can see that udev events are also broadcast using netlink. Even though netlink is often used to communicate with the kernel, NETLINK_KOBJECT_UEVENT allows for userspace-to-userspace communication. We just have to change the multicast group in our sample program to MONITOR_GROUP_UDEV which is 2.