40 lines
877 B
Crystal
40 lines
877 B
Crystal
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class IPC::Client < IPC::Context
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property server_fd : Int32?
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# By default, this is a client.
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def initialize(service_name : String)
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super()
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serverfd = 0
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r = LibIPC.ipc_connection(self.pointer, service_name, pointerof(serverfd))
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if r.error_code != 0
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m = String.new r.error_message.to_slice
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raise Exception.new "error during connection establishment: #{m}"
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end
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@server_fd = serverfd
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# Very important as there are filesystem side-effects.
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at_exit { close }
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end
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def fd
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@server_fd
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end
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def read
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unless (fd = @server_fd).nil?
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message = LibIPC::Message.new
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r = LibIPC.ipc_read_fd(fd, pointerof(message))
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if r.error_code != 0
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m = String.new r.error_message.to_slice
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raise Exception.new "error reading a message: #{m}"
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end
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IPC::Message.new pointerof(message)
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else
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raise "Client not connected to a server"
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end
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end
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end
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