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Add SYS_SENDFD

Jacob Lorentzonrequested to merge
4lDO2/syscall:sendfd into master

Adds a new powerful syscall, SYS_SENDFD, which allows sending file descriptors via a scheme socket. The scheme can choose to receive the file descriptor by calling SKMSG_FOBTAINFD, or the kernel will automatically close it after the scheme responds.

Edited by Jacob Lorentzon

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