fix #1775 (#1829)

* fix #1775

* Check socket file exist after restart

* Add entry in HISTORY.md

* link on PR

History.md

@@ -2,7 +2,8 @@
 
 x features
 
-* ? bugfixes
+* 2 bugfixes
+  * Socket removed after reload (#1829)
   * Add extconf tests for DTLS_method & TLS_server_method, use in minissl.rb.  (#1832)
 
 ## 4.0.0 / 2019-06-25

lib/puma/binder.rb

@@ -53,7 +53,8 @@ module Puma
       @unix_paths.each do |i|
         # Errno::ENOENT is intermittently raised
         begin
-          File.unlink i
+          unix_socket = UNIXSocket.new i
+          unix_socket.close
         rescue Errno::ENOENT
         end
       end

test/test_integration.rb

@@ -197,6 +197,7 @@ class TestIntegration < Minitest::Test
     ccli.run
 
     assert_kind_of Thread, t.join, "server didn't stop"
+    assert File.exist? @bind_path
   end
 
   def test_kill_unknown_via_pumactl