suricata: expose SuricataMainLoop and GlobalsDestroy

Expose SuricataMainLoop and GlobalsDestroy so that SuricataMain can be
replicated by a library user of Suricata.

These removes the `suricata` instance as a function argument to some
of these functions, as the way we use it now, it serves no
purpose. However, it is a reminder that it should probably be
refactored to not be a global, as at some point it might be desirable
for to have multiple instances active without data sharing.

src/suricata.c

@@ -363,8 +363,9 @@ void GlobalsInitPreConfig(void)
     FrameConfigInit();
 }
 
-static void GlobalsDestroy(SCInstance *suri)
+void GlobalsDestroy(void)
 {
+    SCInstance *suri = &suricata;
     HostShutdown();
     HTPFreeConfig();
     HTPAtExitPrintStats();
@@ -2807,8 +2808,9 @@ int PostConfLoadedSetup(SCInstance *suri)
     SCReturnInt(TM_ECODE_OK);
 }
 
-static void SuricataMainLoop(SCInstance *suri)
+void SuricataMainLoop(void)
 {
+    SCInstance *suri = &suricata;
     while(1) {
         if (sigterm_count || sigint_count) {
             suricata_ctl_flags |= SURICATA_STOP;
@@ -3001,7 +3003,7 @@ void SuricataInit(int argc, char **argv)
     return;
 
 out:
-    GlobalsDestroy(&suricata);
+    GlobalsDestroy();
     exit(EXIT_SUCCESS);
 }
 
@@ -3090,11 +3092,11 @@ int SuricataMain(int argc, char **argv)
     /* Post-initialization tasks: wait on thread start/running and get ready for the main loop. */
     SuricataPostInit();
 
-    SuricataMainLoop(&suricata);
+    SuricataMainLoop();
 
     /* Shutdown engine. */
     SuricataShutdown();
-    GlobalsDestroy(&suricata);
+    GlobalsDestroy();
 
     exit(EXIT_SUCCESS);
 }

src/suricata.h

@@ -195,8 +195,10 @@ void SuricataPreInit(const char *progname);
 void SuricataInit(int argc, char **argv);
 void SuricataPostInit(void);
 int SuricataMain(int argc, char **argv);
+void SuricataMainLoop(void);
 void SuricataShutdown(void);
 int InitGlobal(void);
+void GlobalsDestroy(void);
 int PostConfLoadedSetup(SCInstance *suri);
 void PostConfLoadedDetectSetup(SCInstance *suri);