#include <signal.h>
#include <sys/types.h>
#include <unistd.h>

void new_op(int,siginfo_t*,void*);
int main(int argc,char**argv)
{
   struct sigaction act; 
   int sig;
   sig=atoi(argv[1]);

   sigemptyset(&act.sa_mask);
   act.sa_flags=SA_SIGINFO;
   act.sa_sigaction=new_op;

   if(sigaction(sig,&act,NULL) < 0)
   {
       printf("install sigal error\n");
   }

   while(1)
   {
       sleep(2);
       printf("wait for the signal\n");
   }
}

void new_op(int signum,siginfo_t *info,void *myact)
{
   printf("receive signal %d", signum);
   sleep(5);
}