local skynet = require "skynet"
  local debugchannel = require "skynet.debugchannel"
  
  local CMD = {}
  
  local channel
  
  function CMD.start(address, fd)
  	assert(channel == nil, "start more than once")
  	skynet.error(string.format("Attach to :%08x", address))
  	local handle
  	channel, handle = debugchannel.create()
  	local ok, err = pcall(skynet.call, address, "debug", "REMOTEDEBUG", fd, handle)
  	if not ok then
  		skynet.ret(skynet.pack(false, "Debugger attach failed"))
  	else
  		-- todo hook
  		skynet.ret(skynet.pack(true))
  	end
  	skynet.exit()
  end
  
  function CMD.cmd(cmdline)
  	channel:write(cmdline)
  end
  
  function CMD.ping()
  	skynet.ret()
  end
  
  skynet.start(function()
  	skynet.dispatch("lua", function(_,_,cmd,...)
  		local f = CMD[cmd]
  		f(...)
  	end)
  end)