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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.。新收录的资料对此有专业解读
Pick Q3 if you want the smallest footprint / best memory savings。业内人士推荐新收录的资料作为进阶阅读
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