How Can I Handle Access Violations in Standard C Using Exceptions?

Exception Handling for Access Violations in Standard C

Accessing memory beyond the boundaries of an allocated object can lead to an access violation exception. In standard C , it is not possible to catch this exception directly using the standard exception handlers.

To handle access violations, one approach involves utilizing platform-specific mechanisms. However, in this article, we explore a method that leverages exceptions and error handling in standard C .

The Magic of Throw and Catch

The key to capturing access violations is to throw an exception within the signal handler function and then catch it in the main program. This ensures that the program does not terminate abnormally when the access violation occurs.

void SignalHandler(int signal)
{
    printf("Signal %d",signal);
    throw "!Access Violation!";
}

In the main function, we must set the signal handler for the SIGSEGV signal (the signal for segmentation faults) and establish a try-catch block to handle the exception.

int main()
{
    typedef void (*SignalHandlerPointer)(int);

    SignalHandlerPointer previousHandler;
    previousHandler = signal(SIGSEGV , SignalHandler);
    try{
        *(int *) 0 = 0;// Baaaaaaad thing that should never be caught. You should write good code in the first place.
    }
    catch(char *e)
    {
        printf("Exception Caught: %s\n",e);
    }
    printf("Now we continue, unhindered, like the abomination never happened. (I am an EVIL genius)\n");
    printf("But please kids, DONT TRY THIS AT HOME ;)\n");

}

Conclusion

While catching access violations in standard C is not straightforward, the approach presented in this article offers a way to handle these exceptions programmatically. By utilizing signal handlers and exception handling mechanisms, developers can create more robust code that can gracefully recover from such errors.

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