Do not stop the receiver if SysV message queues can't be created

docs/changelog.md

@@ -53,6 +53,7 @@ SPDX-FileCopyrightText: 2011-2020 Carles Fernandez-Prades <carles.fernandez@cttc
   `None`. This allows packaging in some distributions that pass an arbitrary
   name as the build type (e.g., Gentoo) to avoid unexpected compiler flags. The
   building option `ENABLE_PACKAGING` must set to `ON` when packaging.
+- Do not stop the receiver if SysV message queues cannot be created.
 
 ### Improvements in Reliability:
 

src/core/receiver/control_thread.cc

@@ -1106,8 +1106,8 @@ void ControlThread::sysv_queue_listener()
 
     if ((msqid_ = msgget(key, 0644 | IPC_CREAT)) == -1)
         {
-            perror("GNSS-SDR cannot create SysV message queues");
-            exit(1);
+            std::cerr << "GNSS-SDR cannot create SysV message queues" << std::endl;
+            read_queue = false;
         }
 
     while (read_queue && !stop_)