add core dump when segfault

.gitignore

@@ -1,6 +1,7 @@
 *.o
 *.fsu
 *.root
+core.FSUDAQ*
 
 FSUDAQ_Qt6
 test

README.md

@@ -159,6 +159,23 @@ if you want to use GDB debugger, in the *.pro file add
 
 There is a folder Aux, this folder contains many auxillary programs, such as EventBuilder. User can `make` under the folder to compile the programs.
 
+# Enable Core dump 
+
+The program has abort handler to save core dump.
+
+first, enable the gdb in compilation by edit the FSUDAQ_Qt6.pro by commen out the following lines:
+```sh
+QMAKE_CXXFLAGS += -g
+QMAKE_CXXFLAGS_RELEASE = -O0
+QMAKE_CFLAGS_RELEASE = -O0
+```
+
+second, ensure the core dump file has unlimited size and set the core dump file name
+```sh
+>ulimit -c unlimited
+>echo "core.%e.%p" | sudo tee /proc/sys/kernel/core_pattern
+```
+
 
 # Known Issues
 

main.cpp

@@ -12,26 +12,28 @@
 
 #include <sys/resource.h>
 
-// class CustomApplication : public QApplication{
+#include <csignal>
-// public:
+#include <cstdlib>
-//     CustomApplication(int &argc, char **argv) : QApplication(argc, argv) {}
+#include <iostream>
 
-// protected:
+void abortHandler(int signal) {
-//     bool notify(QObject *receiver, QEvent *event) override{
+    std::cerr << "Signal received: " << signal << ", aborting..." << std::endl;
-//         qDebug() << event->type() << "Receiver:" << receiver;
+    std::abort();  // Calls abort to generate core dump
-//         return QApplication::notify(receiver, event);
+}
-//     }
-// };
 
 int main(int argc, char *argv[]){
 
+    std::signal(SIGSEGV, abortHandler);
+
+    setpriority(PRIO_PROCESS, 0, -20);
+
     // CustomApplication a(argc, argv);
     QApplication a(argc, argv);
 
+    // Set Locale
     QLocale::setDefault(QLocale::system());
 
-    setpriority(PRIO_PROCESS, 0, -20);
+    // Set Lock file
-
     bool isLock = false;
     int pid = 0;
     QFile lockFile(DAQLockFile);