CODEWITHSUNDEEP
c++c++11
uilianries
uilianries

Reputation: 3887

Bind SIGTERM to a member function

I would like to create a simple class to signals handling (just for study) with std::bind. However, I could not compile this code:

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

class SignalHandler
{   
public:

    void handler(int value)
    {
        cout << value << endl;
    }

    SignalHandler()
    {
        auto callback = std::bind(&SignalHandler::handler, this, std::placeholders::_1);

        sighandler_t ret = std::signal(SIGTERM, callback);
        if (SIG_ERR == ret) {
            throw;
        }
    }

};

int main() {

    SignalHandler handler;

    raise(SIGTERM);

    return 0;
}

(GCC) Compiler exit: prog.cpp: In constructor 'SignalHandler::SignalHandler()': prog.cpp:21:51: error: cannot convert 'std::_Bind(SignalHandler*, std::_Placeholder<1>)>' to '__sighandler_t {aka void ()(int)}' for argument '2' to 'void ( signal(int, __sighandler_t))(int)' sighandler_t ret = std::signal(SIGTERM, callback);

Upvotes: 0

Views: 864

Answers (1)

donjuedo
donjuedo

Reputation: 2505

You can use static methods to handle SIGTERM, et al. I've done that before. static was the key to get signatures to match.

Upvotes: 1

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