system: use signalfd for dlt-system

1: Move the call of pthread_sigmask in dlt-qnx-systems main before DLT_REGISTER_APP, because this already spawns a thread, what was done without applying pthread_sigmask before.
2: Replaced all threads in dlt-system, that are spawned for each feature, through one poll. This poll waits for a file descriptor event, that triggers the feature routine, that was executed before in the thread. Done this for following processes:

* reading syslog and journal
* frequently reading logfile and logprocess
* triggering filetransfer, if a file was added/changed in watched directory
* checking watchdog timer of systemd service file with defined intervall

Signed-off-by: dbiastoch <dbiastoch@de.adit-jv.com>

1 files changed, 12 insertions, 13 deletions

diff --git a/src/dlt-qnx-system/dlt-qnx-system.c b/src/dlt-qnx-system/dlt-qnx-system.c
index afd34b4..03ad0fb 100644
--- a/src/dlt-qnx-system/dlt-qnx-system.c
+++ b/src/dlt-qnx-system/dlt-qnx-system.c
@@ -70,28 +70,27 @@ int main(int argc, char* argv[])
         daemonize();
     }
 
-    DLT_REGISTER_APP(config.applicationId, "DLT QNX System");
-    DLT_REGISTER_CONTEXT(dltQnxSystem, config.applicationContextId,
-            "Context of main dlt qnx system manager");
-
-    DLT_LOG(dltQnxSystem, DLT_LOG_DEBUG,
-            DLT_STRING("Setting signals wait for abnormal exit"));
-
-    g_threads.mainThread = pthread_self();
-
     sigemptyset(&mask);
     sigaddset(&mask, SIGTERM);
     sigaddset(&mask, SIGHUP);
     sigaddset(&mask, SIGQUIT);
     sigaddset(&mask, SIGINT);
     sigaddset(&mask, SIGALRM);
-    if (pthread_sigmask(SIG_BLOCK, &mask, NULL) == -1) {
-        DLT_LOG(dltQnxSystem, DLT_LOG_WARN,
-                DLT_STRING("Failed to block signals!"));
-        DLT_UNREGISTER_APP();
+    if (pthread_sigmask(SIG_BLOCK, &mask, NULL) != 0)
+    {
+        fprintf(stderr, "Couldn't set mask for potential future threads.\n");
         return -1;
     }
 
+    DLT_REGISTER_APP(config.applicationId, "DLT QNX System");
+    DLT_REGISTER_CONTEXT(dltQnxSystem, config.applicationContextId,
+            "Context of main dlt qnx system manager");
+
+    DLT_LOG(dltQnxSystem, DLT_LOG_DEBUG,
+            DLT_STRING("Setting signals wait for abnormal exit"));
+
+    g_threads.mainThread = pthread_self();
+
     DLT_LOG(dltQnxSystem, DLT_LOG_DEBUG, DLT_STRING("Launching threads."));
     start_threads(&config);