signal.hh

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#ifndef UTOPIA_CORE_SIGNAL_HH
#define UTOPIA_CORE_SIGNAL_HH
 
#include <csignal>
#include <atomic>
 
namespace Utopia {
 
 
std::atomic<bool> stop_now;
 
std::atomic<int> received_signum;
 
void default_signal_handler(int signum) {
    stop_now.store(true);
    received_signum.store(signum);
}
 
 
template<typename Handler>
void attach_signal_handler(int signum, Handler&& handler) {
    // Initialize the signal flag to make sure it is false
    stop_now.store(false);
 
    // Also initialize the global variable storing the received signal
    received_signum.store(0);
 
    // Use POSIX-style sigaction definition rather than deprecated signal
    struct sigaction sa;
    sa.sa_handler = handler;
    sa.sa_flags = 0;
 
    // Add only the given signal to the set of actions
    // See sigaddset documentation: https://linux.die.net/man/3/sigfillset
    sigaddset(&sa.sa_mask, signum);
 
    sigaction(signum, &sa, NULL);
}
 
void attach_signal_handler(int signum) {
    attach_signal_handler(signum, default_signal_handler);
}
 
} // namespace Utopia
 
#endif // UTOPIA_CORE_SIGNAL_HH