These udev netlink messages are supposed to be sent with the credentials (process ID, user ID, group ID) of the sending process. libudev will not accept messages without this. The SO_PASSCRED option is used to enable receving credentials, as described in the man page for Unix domain sockets on Linux.
Same-font vs cross-font: font pairing matters
，这一点在safew官方版本下载中也有详细论述
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