#pragma interface
#include <Event.h>
extern "C" {
#include <signal.h>
}

class Signal {
  int sig;
  void (*save)(int);		// previous handler
  Event *prev;
  static void handler(int);
protected:
  void *operator new(size_t);	// enforce LIFO cnstr/destr
public:
  static struct timeval timeout;// timeout set to zero on signal
  Signal(int,Event * = 0);
  static int check();
  virtual ~Signal();		// virtual to suppress bogus g++ 2.2 warning
};

struct SignalEvent: Event, private Signal {
  SignalEvent(int s): Signal(s,this) { }
};