Make closing the document work again in the iOS (and Android?) app

But opening a second document now hangs.

Sigh, the plumbing in the mobile apps is so extremely fragile. But
that is to be expected when turning a multi-process structure (where
one class of processes exit as soon as they have done their job) into
a single process running forever.

Change-Id: I0fdb751f44e16efb42843189969e049bf14816f0
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/90443
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

kit/Kit.cpp

@@ -2149,14 +2149,21 @@ protected:
                 LOG_DBG("CreateSession failed.");
             }
         }
-#if !MOBILEAPP
+
         else if (tokens.equals(0, "exit"))
         {
+#if !MOBILEAPP
             LOG_INF("Terminating immediately due to parent 'exit' command.");
             Log::shutdown();
             std::_Exit(EX_SOFTWARE);
-        }
+#else
+            LOG_INF("Setting TerminationFlag due to 'exit' command.");
+            SigUtil::setTerminationFlag();
+
+            // Not really a logic error, but hey. This is expected to be caught in SocketPoll::poll().
+            throw std::logic_error("exit");
 #endif
+        }
         else if (tokens.equals(0, "tile") || tokens.equals(0, "tilecombine") || tokens.equals(0, "canceltiles") ||
                 tokens.equals(0, "paintwindow") || tokens.equals(0, "resizewindow") ||
                 LOOLProtocol::getFirstToken(tokens[0], '-') == "child")

net/Socket.hpp

@@ -673,6 +673,7 @@ public:
                 LOG_ERR("Error while handling poll for socket #" <<
                         _pollFds[i].fd << " in " << _name << ": " << exc.what());
                 disposition.setClosed();
+                rc = -1;
             }
 
             if (disposition.isMove() || disposition.isClosed())

wsd/DocumentBroker.hpp

@@ -108,7 +108,6 @@ public:
 
         try
         {
-#if !MOBILEAPP // There is no "child process" in a mobile app
             LOG_DBG("Closing ChildProcess [" << _pid << "].");
 
             // Request the child to exit
@@ -117,7 +116,7 @@ public:
                 LOG_DBG("Stopping ChildProcess [" << _pid << "] by sending 'exit' command.");
                 sendTextFrame("exit");
             }
-#endif
+
             // Shutdown the socket.
             if (_ws)
                 _ws->shutdown();