Add support for backtraces on crashes of CollectAgent.

CollectAgent/Makefile

@@ -14,7 +14,7 @@ P =		$(shell cd $(DCDBDEPLOYPATH)/lib/ && pwd)
 U =		$(shell uname)
 
 $(TARGET): $(OBJS)
-	$(CXX) -o $(TARGET) $(OBJS) $(LIBS)
+	$(CXX) $(CXXFLAGS) -o $(TARGET) $(OBJS) $(LIBS)
 
 all:	$(TARGET)
 

CollectAgent/collectagent.cpp

@@ -17,6 +17,7 @@
 
 #include "simplemqttserver.h"
 #include "messaging.h"
+#include "abrt.h"
 
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
@@ -29,12 +30,18 @@ uint64_t pmsgCtr;
 SensorDataStore *mySensorDataStore;
 std::string host;
 
-
+/* Normal termination (SIGINT, CTRL+C) */
 void sigHandler(int sig)
 {
   keepRunning = 0;
 }
 
+/* Crash */
+void abrtHandler(int sig)
+{
+  abrt(EXIT_FAILURE, SIGNAL);
+}
+
 void mqttCallback(SimpleMQTTMessage *msg)
 {
   /*
@@ -129,6 +136,13 @@ int main(int argc, char* const argv[]) {
        */
       signal(SIGINT, sigHandler);
 
+      /*
+       * Catch critical signals to allow for backtraces
+       */
+      signal(SIGABRT, abrtHandler);
+      signal(SIGSEGV, abrtHandler);
+      signal(SIGTERM, abrtHandler);
+
       /* Parse command line */
       char ret;
       host="localhost";
@@ -187,7 +201,7 @@ int main(int argc, char* const argv[]) {
   }
   catch (const exception& e) {
       cout << "Exception: " << e.what() << "\n";
-      exit(EXIT_FAILURE);
+      abrt(EXIT_FAILURE, INTERR);
   }
 
   return EXIT_SUCCESS;

CollectAgent/simplemqttserverthread.cpp

@@ -6,6 +6,7 @@
  */
 
 #include "simplemqttserver.h"
+#include "abrt.h"
 
 using namespace std;
 using namespace boost::system;
@@ -44,7 +45,7 @@ SimpleMQTTServerThread::SimpleMQTTServerThread()
   terminate = false;
   if (pthread_create(&t, NULL, launch, this) != 0) {
       cout << "Error creating new MQTT server thread.\n";
-      exit(EXIT_FAILURE);
+      abrt(EXIT_FAILURE, INTERR);
   }
 
 #ifdef SimpleMQTTVerbose
@@ -63,7 +64,7 @@ SimpleMQTTServerThread::~SimpleMQTTServerThread()
   terminate = true;
   if (pthread_join(t, NULL) != 0) {
       cout << "Error joining thread.\n";
-      exit(EXIT_FAILURE);
+      abrt(EXIT_FAILURE, INTERR);
   }
 
 #ifdef SimpleMQTTVerbose

include/abrt.h

+/*
+ *  abrt.h
+ *
+ *  Created on: Mar 24, 2015
+ *      Author: Axel Auweter
+ */
+
+#include <stdio.h>
+#include <execinfo.h>
+
+#ifndef ABRT_H
+#define ABRT_H
+
+#define STACKTRACE_DEPTH 20
+
+typedef enum {
+  SIGNAL,
+  INTERR
+} AbrtSrc;
+
+/* Abort handler that prints out a stack trace */
+static inline void abrt(int exitcode, AbrtSrc source)
+{
+  void* fcn_ptr[STACKTRACE_DEPTH];
+  size_t fcn_ptr_num_elems;
+
+  fcn_ptr_num_elems = backtrace(fcn_ptr, STACKTRACE_DEPTH);
+
+  fprintf(stderr, "Program abort due to %s. Backtrace:\n",
+      source == SIGNAL ? "signal" :
+      source == INTERR ? "internal error" :
+      "unknown error"
+      );
+
+  backtrace_symbols_fd(fcn_ptr, fcn_ptr_num_elems, STDERR_FILENO);
+
+  exit(exitcode);
+}
+
+#endif