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3600508fe1
Cross-platform versions of msghdr, sendmsg, recvmsg, linger, and iovec were provided based on findings from glibc, musl, and Microsoft's documentation. Implemented initial Reactor interface for epoll (linux) which wraps around I/O reactor subsystems such as epoll, kqueue, select, etc. across different platforms. The Reactor interface allows for driving async I/O in Zig applications. A test was added for the Reactor interface to drive a TCP client/listener socket pair. A greatest-common-subset of possible socket initialization flags (close socket on exec syscalls, initialize socket to be non-blocking) were implemented. A test was added for using sendmsg/recvmsg syscalls across different platforms for a TCP client/listener socket pair.