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From man 7 unix

SCM_RIGHTS Send or receive a set of open file descriptors from another process. The data portion contains an integer array of the file descriptors. The passed file descriptors behave as though they have been created with dup(2).

There are also other concepts with SCM in them; what does SCM mean here? I didn't manage to find it.

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SCM in this context stands for “socket-level control message” (see also the processing implementation).

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