New option exit_only_after_terminate to prevent Bro from exiting.

If set, the main loop won't terminate before somebody calls
terminate().

This should make input framework testing more reliable I'd hope.

scripts/base/init-bare.bro

@@ -2608,6 +2608,15 @@ const gap_report_freq = 1.0 sec &redef;
 ## .. bro:see:: content_gap gap_report partial_connection
 const report_gaps_for_partial = F &redef;
 
+## Flag to prevent Bro from exiting automatically when input is exhausted.
+## Normally Bro terminates when all packets sources have gone dry
+## and  communication isn't enabled. If this flag is set, Bro's main loop will
+## instead keep idleing until :bro:see::`terminate` is explicitly called. 
+## 
+## This is mainly for testing purposes when termination behaviour needs to be
+## controlled for reproducing results. 
+const exit_only_after_terminate = F &redef;
+
 ## The CA certificate file to authorize remote Bros/Broccolis.
 ##
 ## .. bro:see:: ssl_private_key ssl_passphrase

src/Net.cc

@@ -421,7 +421,8 @@ void net_run()
 	set_processing_status("RUNNING", "net_run");
 
 	while ( io_sources.Size() ||
-		(packet_sorter && ! packet_sorter->Empty()) )
+		(packet_sorter && ! packet_sorter->Empty()) ||
+		(BifConst::exit_only_after_terminate && ! terminating) )
 		{
 		double ts;
 		IOSource* src = io_sources.FindSoonest(&ts);

src/const.bif

@@ -6,6 +6,7 @@ const ignore_keep_alive_rexmit: bool;
 const skip_http_data: bool;
 const use_conn_size_analyzer: bool;
 const report_gaps_for_partial: bool;
+const exit_only_after_terminate: bool;
 
 const NFS3::return_data: bool;
 const NFS3::return_data_max: count;