Fix. multi:info_read correctly remove easy handle.

examples/cURLv3/multi2.lua

@@ -0,0 +1,35 @@
+local cURL = require("cURL")
+
+local f1 = io.open("lua.html",    "w+b")
+local f2 = io.open("luajit.html", "w+b")
+
+-- setup easy and url
+c1 = cURL.easy{url = "http://www.lua.org/", writefunction = f1}
+c2 = cURL.easy{url = "http://luajit.org/",  writefunction = f2}
+c3 = cURL.easy{url = "****://luajit.org/"} -- UNSUPPORTED_PROTOCOL
+
+m = cURL.multi()
+  :add_handle(c1)
+  :add_handle(c2)
+  :add_handle(c3)
+
+local remain = 3
+while remain > 0 do
+  local last = m:perform() -- do some work
+  if last < remain then    -- we have done some tasks
+    while true do          -- proceed results/errors
+      local e, ok, err = m:info_read(true) -- get result and remove handle
+      if e == 0 then break end -- no more finished tasks
+      if ok then -- succeed
+        print(e:getinfo_effective_url(), '-', e:getinfo_response_code())
+      else -- failure
+        print(e:getinfo_effective_url(), '-', err)
+      end
+      e:close()
+    end
+  end
+  remain = last
+
+  -- wait while libcurl do io select
+  m:wait()
+end

src/lua/cURL/impl/cURL.lua

@@ -393,7 +393,16 @@ function Multi:remove_handle(e)
   return remove_handle(self, h)
 end
 
---! @fixme Multi:info_read(true) should also remove easy handle from self._easy
+function Multi:info_read(...)
+  local h, ok, err = self:handle():info_read(...)
+  if not h then return nil, ok end
+  if h == 0 then return h end
+
+  if ... and self._easy[h] then
+    self._easy[h], self._easy.n = nil, self._easy.n - 1
+  end
+  return h, ok, err
+end
 
 end
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