wasm: add host-side vsock listeners - #42
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Accept guest-initiated connections in the virtio-vsock device. listen(port, handler) binds a callback-scoped listener: the connection lives exactly as long as the handler, resolving into a graceful shutdown and rejecting into a reset. Track connections by local and peer port so several guest sockets can share one service port, allocate host ephemeral ports from [2^30, 2^31) like Firecracker's muxer so they can never collide with listeners, deliver end of stream when the guest shuts down its send side, and answer packets for unbound ports with RST as the kernel transport does.
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Superseded now that the host-side JavaScript lives in
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Accept guest-initiated connections in the virtio-vsock device. listen(port, handler) binds a callback-scoped listener: the connection lives exactly as long as the handler, resolving into a graceful shutdown and rejecting into a reset. Track connections by local and peer port so several guest sockets can share one service port, allocate host ephemeral ports from [2^30, 2^31) like Firecracker's muxer so they can never collide with listeners, deliver end of stream when the guest shuts down its send side, and answer packets for unbound ports with RST as the kernel transport does.