usr_signals.H

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#ifndef USR_SIGNALS_HEADER
#define USR_SIGNALS_HEADER

#include <csignal>

// this is tiny and somewhat "dirty"
// the stuff presented here is not interrupt-safe!
// so it could be that a signal just gets lost!
// (but in the moment we just don't care about...)

class Cusr_signal_proxy
{
private:
 static bool SIGUSR1_received;
 static bool SIGUSR2_received;
 static void signalhandler(int signal);
 sighandler_t dflusr1, dflusr2;
 bool previous1,previous2;
public:
 Cusr_signal_proxy()
  {
    previous1=SIGUSR1_received; SIGUSR1_received=false;
    dflusr1=signal(SIGUSR1,signalhandler);
    previous2=SIGUSR2_received; SIGUSR2_received=false;
    dflusr2=signal(SIGUSR2,signalhandler);
  }
 ~Cusr_signal_proxy()
  {
    SIGUSR1_received=previous1;
    dflusr1=signal(SIGUSR1,dflusr1);
    SIGUSR2_received=previous2;
    dflusr1=signal(SIGUSR2,dflusr2);
  }
 const bool got_SIGUSR1()
  {
    if (SIGUSR1_received) { SIGUSR1_received=false; return true; }
    return false;
  }
 const bool got_SIGUSR2()
  {
    if (SIGUSR2_received) { SIGUSR2_received=false; return true; }
    return false;
  }
};

#endif /* USR_SIGNALS_HEADER */

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