#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
extern int errno;

main()
{
  sigset_t	UnBlockSig,
    BlockSig,
    AuthBlockSig;
  

  struct sigaction act,
    oact;
  void handler();

  sigemptyset(&UnBlockSig);
  sigfillset(&BlockSig);
  sigfillset(&AuthBlockSig);
  
	/*
	 * Unmark those signals that should never be blocked. Some of these
	 * signal names don't exist on all platforms.  Most do, but might as
	 * well ifdef them all for consistency...
	 */
#ifdef SIGTRAP
  sigdelset(&BlockSig, SIGTRAP);
  sigdelset(&AuthBlockSig, SIGTRAP);
#endif
#ifdef SIGABRT
  sigdelset(&BlockSig, SIGABRT);
  sigdelset(&AuthBlockSig, SIGABRT);
#endif
#ifdef SIGILL
  sigdelset(&BlockSig, SIGILL);
  sigdelset(&AuthBlockSig, SIGILL);
#endif
#ifdef SIGFPE
  sigdelset(&BlockSig, SIGFPE);
  sigdelset(&AuthBlockSig, SIGFPE);
#endif
#ifdef SIGSEGV
  sigdelset(&BlockSig, SIGSEGV);
  sigdelset(&AuthBlockSig, SIGSEGV);
#endif
#ifdef SIGBUS
  sigdelset(&BlockSig, SIGBUS);
  sigdelset(&AuthBlockSig, SIGBUS);
#endif
#ifdef SIGSYS
  sigdelset(&BlockSig, SIGSYS);
  sigdelset(&AuthBlockSig, SIGSYS);
#endif
#ifdef SIGCONT
  sigdelset(&BlockSig, SIGCONT);
  sigdelset(&AuthBlockSig, SIGCONT);
#endif
#ifdef SIGTERM
  sigdelset(&AuthBlockSig, SIGTERM);
#endif
#ifdef SIGQUIT
  sigdelset(&AuthBlockSig, SIGQUIT);
#endif
#ifdef SIGALRM
  sigdelset(&AuthBlockSig, SIGALRM);
#endif
  act.sa_handler = handler;
  sigemptyset(&act.sa_mask);
  act.sa_flags = 0;
  //  if (signo != SIGALRM)
  //  act.sa_flags |= SA_RESTART;
  /* #ifdef SA_NOCLDSTOP
  if (signo == SIGCHLD)
    act.sa_flags |= SA_NOCLDSTOP;
    #endif */
  if (sigaction(SIGALRM, &act, &oact) < 0)
    fprintf(stderr, "sigaction failed, errno = %d\n",errno);
  handler(0);
  for (;;)
    ;
}

void handler(sig)
{

  struct itimerval timeval;

  memset(&timeval,0,sizeof(struct itimerval));
  timeval.it_value.tv_sec=5;
  timeval.it_value.tv_usec=0;
  if (setitimer(ITIMER_REAL,&timeval,NULL) < 0)
    fprintf(stderr, "could not set itimer errono =  %d\n");
  printf("caught sig %d\n",sig);
}