SocketHandlers own the poller and add themself into it only when the socket is created

We want to call socket() with the parameters provided by getaddrinfo, so we
can’t addd the fd into the poller immediately. We need to wait the
connection attempt, and then the SocketHandler can call add_socket_handler
itself, if the connection succeeds, or is in progress.

src/main.cpp

@@ -61,11 +61,11 @@ int main(int ac, char** av)
     return config_help("password");
   if (hostname.empty())
     return config_help("hostname");
-  std::shared_ptr<XmppComponent> xmpp_component =
-    std::make_shared<XmppComponent>(hostname, password);
 
-  Poller p;
-  p.add_socket_handler(xmpp_component);
+  auto p = std::make_shared<Poller>();
+  auto xmpp_component = std::make_shared<XmppComponent>(p,
+                                                        hostname,
+                                                        password);
 
   // Install the signals used to exit the process cleanly, or reload the
   // config
@@ -91,7 +91,7 @@ int main(int ac, char** av)
   xmpp_component->start();
 
   const std::chrono::milliseconds timeout(-1);
-  while (p.poll(timeout) != -1)
+  while (p->poll(timeout) != -1)
   {
     // Check for empty irc_clients (not connected, or with no joined
     // channel) and remove them
@@ -123,14 +123,13 @@ int main(int ac, char** av)
         !xmpp_component->is_connecting())
       {
         xmpp_component->reset();
-        p.add_socket_handler(xmpp_component);
         xmpp_component->start();
       }
     // If the only existing connection is the one to the XMPP component:
     // close the XMPP stream.
     if (exiting && xmpp_component->is_connecting())
       xmpp_component->close();
-    if (exiting && p.size() == 1 && xmpp_component->is_document_open())
+    if (exiting && p->size() == 1 && xmpp_component->is_document_open())
       xmpp_component->close_document();
   }
   log_info("All connection cleanely closed, have a nice day.");