Dune::ExceptionHook Struct Reference

Base class to add a hook to the Dune::Exception. More...

#include <dune/common/exceptions.hh>

Public Member Functions
virtual	~ExceptionHook ()
virtual void	operator() ()=0

Detailed Description

Base class to add a hook to the Dune::Exception.

The user can add a functor which should be called before a Dune::Exception is emitted.

Example: attach a debugger to the process, if an exception is thrown

struct ExceptionHookDebugger : public Dune::ExceptionHook
{
 char * process_;
 char * debugger_;
 ExceptionHookDebugger (int argc, char ** argv, std::string debugger)
 {
     process_ = strdup(argv[0]);
     debugger_ = strdup(debugger.c_str());
 }
 virtual void operator () ()
 {
     pid_t pid = getpid();
     pid_t cpid;
     cpid = fork();
     if (cpid == 0) // child
     {
         char * argv[4];
         argv[0] = debugger_;
         argv[1] = process_;
         argv[2] = new char[12];
         snprintf(argv[2], 12, "%i", int(pid));
         argv[3] = 0;
         // execute debugger
         std::cout << process_ << "\n";
         std::cout << argv[0] << " "
                   << argv[1] << " "
                   << argv[2] << std::endl;
         execv(argv[0], argv);
     }
     else // parent
     {
         // send application to sleep
         kill(pid, SIGSTOP);
     }
 }
};

This hook is registered via a static method of Dune::Exception:

int main(int argc, char** argv) {
 Dune::MPIHelper & mpihelper = Dune::MPIHelper::instance(argc,argv);
 ExceptionHookDebugger debugger(argc, argv, "/usr/bin/ddd");
 Dune::Exception::registerHook(& debugger);
 try
 {
     ...
 }
 catch (std::string & s) {
     std::cout << mpihelper.rank() << ": ERROR: " << s << std::endl;
 }
 catch (Dune::Exception & e) {
     std::cout << mpihelper.rank() << ": DUNE ERROR: " << e.what() << std::endl;
 }
}

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The documentation for this struct was generated from the following file:

• exceptions.hh