Function sim_tapdev_init

arch/sim/src/sim/posix/sim_tapdev.c:190–296

 ****************************************************************************/

void sim_tapdev_init(int devidx, void *priv,
                 void (*tx_done_intr_cb)(void *priv),
                 void (*rx_ready_intr_cb)(void *priv))
{
  struct ifreq ifr;
  int tapdevfd;
  int ret;
  int sockfd;

  /* Open the tap device */

  tapdevfd = open(DEVTAP, O_RDWR, 0644);
  if (tapdevfd < 0)
    {
      syslog(LOG_ERR, "TAPDEV: open failed: %d\n", -tapdevfd);
      return;
    }

  /* Configure the tap device */

  memset(&ifr, 0, sizeof(ifr));
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  ret = ioctl(tapdevfd, TUNSETIFF, (unsigned long) &ifr);
  if (ret < 0)
    {
      syslog(LOG_ERR, "TAPDEV: ioctl failed: %d\n", -ret);
      close(tapdevfd);
      return;
    }

  /* Save the tap device name */

  strncpy(gdevname[devidx], ifr.ifr_name, IFNAMSIZ);

  /* Get a socket with which to manipulate the tap device; the remaining
   * ioctl calls unfortunately won't work on the tap device fd.
   */

  sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sockfd < 0)
    {
      syslog(LOG_ERR, "TAPDEV: Can't open socket: %d\n", -sockfd);
      close(tapdevfd);
      return;
    }

#ifdef CONFIG_SIM_NET_BRIDGE
  /* Assign the tap device to a bridge */

  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, CONFIG_SIM_NET_BRIDGE_DEVICE, IFNAMSIZ);
  ifr.ifr_ifindex = if_nametoindex(gdevname[devidx]);

  ret = ioctl(sockfd, SIOCBRADDIF, &ifr);
  if (ret < 0)
    {
      syslog(LOG_ERR, "TAPDEV: ioctl failed (can't add interface %s to "
             "bridge %s): %d\n",