#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <pthread.h>

/*
  A test program to check how various signals are being processed.
  Compile with: cc signals.c -o signals -lpthread
*/
int main(int argc, char **argv)
{
  sigset_t mask;
  int signo= 0;
  time_t now;
  struct tm bd_time;                            // broken-down time

  /* set up signal processing:  block signals we want to wait for */
  if (sigemptyset(&mask))

  sigaddset(&mask, SIGPIPE);
  sigaddset(&mask, SIGALRM);
  sigaddset(&mask, SIGUSR1);
  sigaddset(&mask, SIGHUP);
  sigaddset(&mask, SIGINT);
  sigaddset(&mask, SIGQUIT);
  sigaddset(&mask, SIGTERM);

  pthread_sigmask(SIG_BLOCK, &mask, NULL);

  while (1)
  {
    sigwait(&mask, &signo);

    now= time(0);
    localtime_r(&now, &bd_time);

    printf("%02d%02d%02d %2d:%02d:%02d    ",
           bd_time.tm_year % 100,
           bd_time.tm_mon + 1,
           bd_time.tm_mday,
           bd_time.tm_hour,
           bd_time.tm_min,
           bd_time.tm_sec);
    printf("signal has come: %i\n", signo);
  }
}