Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Catch Segmentation fault in c++

Tags:

People also ask

Can you catch a segmentation fault?

You can't catch segfaults. Segfaults lead to undefined behavior - period (err, actually segfaults are the result of operations also leading to undefined behavior.

What is the solution for segmentation fault in C?

It can be resolved by having a base condition to return from the recursive function. A pointer must point to valid memory before accessing it.

What causes a segmentation fault in C?

In practice, segfaults are almost always due to trying to read or write a non-existent array element, not properly defining a pointer before using it, or (in C programs) accidentally using a variable's value as an address (see the scanf example below).


Does a try-catch block catch segmentation fault errors?

I am reading a text file using the function given below but sometimes the file is empty and the program crashes. I would like the program to continue running and provide another file when this file is empty or in use.

Path2D read_gesture(const char* filename)
{
    Path2D path;
    //MultiStrokeGesture MultiStrokes;

    vector<string> text_file;

    int no_of_paths=0;
    std::ifstream ifs(filename);

    for (std::string line; std::getline(ifs, line); )
    {
        no_of_paths=no_of_paths+1;
        double a, b;
        stringstream ss(line);
        if (!(ss >> a >> b)) {cout<<"wrong format"<<endl;}
        std::cout << "You said, " << a << ", " << b << ".\n";
        path.push_back(Point2D(a,b));

    }
    cout<<"saving gesture"<<endl;
    return path;


}

I tried something like:

Path2D path;
try 
{
    path=read_gesture("test.txt");
}
catch(int e)
{
    path=read_gesture("test2.txt");
}

but the program still crashes. What might the problem be?

  • A little correction, the file called in catch was not same as that of try, that was a typo.