[Libunwind-devel] Translate signal to C++ exception

[Kamil Rytarowski]

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Hello!

I'm in need of translating a signal handler to C++ exception.

I have got code like this:

#include <iostream>
#include <csignal>
using namespace std;

void catch_signal(int signalNumber)
{
    signal(SIGINT, SIG_DFL);
    throw(signalNumber);
}

int test_signal()
{
    signal(SIGINT, catch_signal);

    try
    {
        raise(SIGINT);
    }
    catch (int &z)
    {
        cerr << "Caught exception: " << z << endl;
    }
    return 0;
}

int main()
{
    try
    {
        test_signal();
    }
    catch (int &z)
    {
        cerr << "Caught unexpected exception: " << z << endl;
    }
    return 0;
}


I'm fully aware that this is unsafe and there are alternative designs
(sig_atomic_t).

My platform is NetBSD and I can use LLVM libunwind (as there is not
finished port of HP (nongnu) libunwind for this system).

I don't know ho to perform unwinding. When I'm using the backtrace(3)
interface, I can see that stack starts with the signal trampoline, I
need to go beyond it.

Thank you in advance,
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