From f0a4320928b80da83ec1f1aa7f86c2c6cffad720 Mon Sep 17 00:00:00 2001
From: Geoffrey Merck <F4FXL@users.noreply.github.com>
Date: Sun, 16 Jan 2022 13:42:24 +0100
Subject: [PATCH] #5 install sig handler

---
 DStarGatewayApp.cpp | 29 +++++++++++++++++++++++++++--
 DStarGatewayApp.h   |  2 ++
 Makefile            |  2 +-
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/DStarGatewayApp.cpp b/DStarGatewayApp.cpp
index 3a8ae42..1b47533 100644
--- a/DStarGatewayApp.cpp
+++ b/DStarGatewayApp.cpp
@@ -23,6 +23,11 @@
 #include <string>
 #include <iostream>
 #include <vector>
+#include <stdio.h>
+#include <execinfo.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 #include "DStarGatewayDefs.h"
 #include "DStarGatewayConfig.h"
@@ -41,9 +46,15 @@
 #include "APRSGPSDIdFrameProvider.h"
 #include "APRSFixedIdFrameProvider.h"
 
-#ifndef UNIT_TESTS
+#ifdef UNIT_TESTS
+int fakemain(int argc, char *argv[])
+#else
 int main(int argc, char *argv[])
+#endif
 {
+	// install sigHandler
+	signal(SIGSEGV, __sigHandler); 
+
 	setbuf(stdout, NULL);
 	if (2 != argc) {
 		printf("usage: %s path_to_config_file\n", argv[0]);
@@ -70,7 +81,21 @@ int main(int argc, char *argv[])
 
 	return 0;
 }
-#endif
+
+void __sigHandler(int sig)
+{
+	if(sig == SIGSEGV) {
+		void *array[100];
+		size_t size;
+		// get void*'s for all entries on the stack
+		size = backtrace(array, 100);
+
+		// print out all the frames to stderr
+		fprintf(stderr, "Error: signal %d:\n", sig);
+		backtrace_symbols_fd(array, size, STDERR_FILENO);
+		exit(1);
+	}
+}
 
 CDStarGatewayApp::CDStarGatewayApp(const std::string &configFile) : m_configFile(configFile), m_thread(NULL)
 {
diff --git a/DStarGatewayApp.h b/DStarGatewayApp.h
index 2af3de9..3461e88 100644
--- a/DStarGatewayApp.h
+++ b/DStarGatewayApp.h
@@ -21,6 +21,8 @@
 
 #include "DStarGatewayThread.h"
 
+void __sigHandler(int sig);
+
 class CDStarGatewayApp
 {
 private:
diff --git a/Makefile b/Makefile
index 973fbaa..b057963 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ export LOG_DIR=/var/log/dstargateway/
 
 ifeq ($(ENABLE_DEBUG), 1)
 # choose this if you want debugging help
-export CPPFLAGS=-g -ggdb -W -Wall -Werror -std=c++17
+export CPPFLAGS=-g -rdynamic -ggdb -W -Wall -Werror -std=c++17
 else
 # or, you can choose this for a much smaller executable without debugging help
 CPPFLAGS=-W -O3 -Wall -Werror -std=c++17