Add support for I/O timeouts on Unix sockets

lib/dalli/socket.rb

@@ -154,7 +154,6 @@ def initialize(*_args)
         end
       end
     else
-
       ##
       # UNIX represents a UNIX domain socket, which is an interprocess communication
       # mechanism between processes on the same host.  Used when the Memcached server
@@ -171,9 +170,16 @@ def self.open(path, options = {})
           Timeout.timeout(options[:socket_timeout]) do
             sock = new(path)
             sock.options = { path: path }.merge(options)
+            init_socket_options(sock, options)
             sock
           end
         end
+
+        def self.init_socket_options(sock, options)
+          # Following the options supported in https://man7.org/linux/man-pages/man7/unix.7.html
+          sock.setsockopt(::Socket::SOL_SOCKET, ::Socket::SO_SNDBUF, options[:sndbuf]) if options[:sndbuf]
+          sock.timeout = options[:socket_timeout] if options[:socket_timeout] && sock.respond_to?(:timeout=)
+        end
       end
     end
   end