From: Sven Eckelmann <sven@narfation.org>
Date: Sun, 1 Dec 2013 14:39:00 +0100
Subject: Allow one to disable forking to background in debug_mode 0

---
 posix/init.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/vis.c
+++ b/vis.c
@@ -58,6 +58,7 @@ buffer_t *fillme = NULL;
 
 static int8_t stop;
 uint8_t debug_level = 0;
+static int no_detach = 0;
 
 formats selected_formats = dot_draw;
 
@@ -716,6 +717,7 @@ void print_usage() {
 	printf( "Usage: vis <interface(s)> \n" );
 	printf( "\t-j output mesh topology as json on port %d\n", JSON_PORT );
 	printf( "\t-d debug level\n" );
+	printf( "\t-D run in foreground\n" );
 	printf( "\t-h help\n" );
 	printf( "\t-v Version\n\n" );
 	printf( "Olsrs3d / Meshs3d is an application to visualize a mesh network.\nIt is a part of s3d, have a look at s3d.berlios.de\n\n" );
@@ -736,7 +738,7 @@ int main( int argc, char **argv ) {
 	fd_set wait_sockets, tmp_wait_sockets;
 
 
-	while ( ( optchar = getopt ( argc, argv, "jd:hv" ) ) != -1 ) {
+	while ( ( optchar = getopt ( argc, argv, "jd:hvD" ) ) != -1 ) {
 
 		switch( optchar ) {
 
@@ -771,6 +773,11 @@ int main( int argc, char **argv ) {
 				selected_formats |= json;
 				found_args++;
 				break;
+ 
+			case 'D':
+				no_detach = 1;
+				found_args++;
+				break;
 
 			default:
 				print_usage();
@@ -889,7 +896,7 @@ int main( int argc, char **argv ) {
 
 
 	/* daemonize */
-	if ( debug_level == 0 ) {
+	if ( debug_level == 0 && !no_detach) {
 
 		if ( my_daemon() < 0 )
 			exit_error( "Error - can't fork to background: %s\n", strerror(errno) );