Use 'curl_socket_t' instead of 'int' for socket.

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.

 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

#elif defined(HAVE_IOCTL_SIOCGIFADDR)

#define SYS_ERROR -1

char *Curl_if2ip(int af, const char *interface, char *buf, int buf_size)

{

  int dummy;

  char *ip=NULL;

  struct ifreq req;

  struct in_addr in;

  struct sockaddr_in *s;

  curl_socket_t dummy;

  size_t len;

  char *ip;

  if(!interface || (af != AF_INET))

    return NULL;

  len = strlen(interface);

  if(len >= sizeof(req.ifr_name))

    return NULL;

  dummy = socket(AF_INET, SOCK_STREAM, 0);

  if(SYS_ERROR == dummy) {

  if(CURL_SOCKET_BAD == dummy)

    return NULL;

  }

  else {

    struct ifreq req;

    size_t len = strlen(interface);

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

    if(len >= sizeof(req.ifr_name)) {

      sclose(dummy);

      return NULL; /* this can't be a fine interface name */

    }

  memcpy(req.ifr_name, interface, len+1);

  req.ifr_addr.sa_family = AF_INET;

    if(SYS_ERROR == ioctl(dummy, SIOCGIFADDR, &req)) {

  if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {

    sclose(dummy);

    return NULL;

  }

    else {

      struct in_addr in;

      struct sockaddr_in *s = (struct sockaddr_in *)&req.ifr_addr;

  s = (struct sockaddr_in *)&req.ifr_addr;

  memcpy(&in, &s->sin_addr, sizeof(in));

  ip = (char *) Curl_inet_ntop(s->sin_family, &in, buf, buf_size);

    }

  sclose(dummy);

  }

  return ip;

}