Function interruptHandlerInit

wiringPi/wiringPi.c:2879–2945

 */

static int interruptHandlerInit(int pin, int EdgeMode, unsigned long debounce_period_us)
{
  const char* strmode = "";
  int ret, attr;
  struct gpio_v2_line_config config;
  struct gpio_v2_line_request req;

  if (wiringPiGpioDeviceGetFd() < 0) {
    return -1;
  }

  if (wiringPiDebug) {
    printf ("interruptHandlerV2: GPIO line %d, edge mode %d, debounce_period_us %lu \n", pin, EdgeMode, debounce_period_us) ;
  }

  memset(&req, 0, sizeof(req));
  memset(&config, 0, sizeof(config));

  /* setup config */
  config.flags = GPIO_V2_LINE_FLAG_INPUT;
  switch(EdgeMode) {
    default:
    case INT_EDGE_SETUP:
      if (wiringPiDebug) {
        printf ("interruptHandlerV2: waitForInterruptMode edge mode INT_EDGE_SETUP - exiting\n") ;
      }
      return 0;
    case INT_EDGE_FALLING:
      config.flags |= GPIO_V2_LINE_FLAG_EDGE_FALLING;
      strmode = "falling";
      break;
    case INT_EDGE_RISING:
      config.flags |= GPIO_V2_LINE_FLAG_EDGE_RISING;
      strmode = "rising";
      break;
    case INT_EDGE_BOTH:
      config.flags |= (GPIO_V2_LINE_FLAG_EDGE_FALLING | GPIO_V2_LINE_FLAG_EDGE_RISING);
      strmode = "both";
      break;
  }
  strcpy(req.consumer, "wiringpi_gpio_irq");

  if (debounce_period_us) {
		attr = config.num_attrs;
		config.num_attrs++;
        gpiotools_set_bit(&config.attrs[attr].mask, 0);
		config.attrs[attr].attr.id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
		config.attrs[attr].attr.debounce_period_us = debounce_period_us;
  }

  req.num_lines = 1;
  req.event_buffer_size = 45;
  req.offsets[0] = pin;
  req.config = config;

  ret = ioctl(chipFd, GPIO_V2_GET_LINE_IOCTL, &req);
  if (ret == -1) {
    ReportDeviceError("interruptHandlerV2: get line event", pin , strmode, ret);