tcp remote side client can't detect closed. (50% probably happened).

[jakitliang]

Onece you had accept a socket:

Step1. Server side

local client = server.accpet()

Step2. Client side

client.close()

Step3. Server side

local data, err, data1 = client.receive()

if err == 'closed' then  -- 50% probably won't triggered close
  client.close()
  print('remote is closed')
end

Because the err == 'closed' is 50% to get triggered.

So not every time the remote close can let luasocket gave a check err == closed.

So Please tell me other way how to check a socket is already closed?

[alerque]

Any chance you could expand this into a full MWE so we can add it to the test suite and also aid in tracking this down?

[alerque]

I think it is possible #81 fixed this recently. We still need an MWE if you can contribute such a thing, but once we have a test case it will be worth checking against before and after that PR merge.

[alerque]

It seems to me this is either a duplicate of #225 or #410 (possibly even both if those two things turn out to be duplicate. Lets continue on those respective issues unless there is solid evidence for this being a unique issue.