src/java.base/unix/native/libnet/NetworkInterface.c

*** 1069,1085 ****
      }
  
      return prefix;
  }
  
  /*
   * Opens a socket for further ioct calls. proto is one of AF_INET or AF_INET6.
   */
  static int openSocket(JNIEnv *env, int proto) {
      int sock;
  
!     if ((sock = socket(proto, SOCK_DGRAM, 0)) < 0) {
          // If we lack support for this address family or protocol,
          // don't throw an exception.
          if (errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT) {
              JNU_ThrowByNameWithMessageAndLastError
                  (env, JNU_JAVANETPKG "SocketException", "Socket creation failed");
--- 1069,1093 ----
      }
  
      return prefix;
  }
  
+ static int socket0(int domain, int type, int protocol) {
+     if (domain == AF_INET) {
+         errno = EAFNOSUPPORT;
+         return -1;
+     }
+     return socket(domain, type, protocol);
+ }
+ 
  /*
   * Opens a socket for further ioct calls. proto is one of AF_INET or AF_INET6.
   */
  static int openSocket(JNIEnv *env, int proto) {
      int sock;
  
!     if ((sock = socket0(proto, SOCK_DGRAM, 0)) < 0) {
          // If we lack support for this address family or protocol,
          // don't throw an exception.
          if (errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT) {
              JNU_ThrowByNameWithMessageAndLastError
                  (env, JNU_JAVANETPKG "SocketException", "Socket creation failed");
*** 1098,1110 ****
   * if it fails return AF_INET6 socket.
   */
  static int openSocketWithFallback(JNIEnv *env, const char *ifname) {
      int sock;
  
!     if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
          if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT) {
!             if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
                  JNU_ThrowByNameWithMessageAndLastError
                      (env, JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
                  return -1;
              }
          } else { // errno is not NOSUPPORT
--- 1106,1118 ----
   * if it fails return AF_INET6 socket.
   */
  static int openSocketWithFallback(JNIEnv *env, const char *ifname) {
      int sock;
  
!     if ((sock = socket0(AF_INET, SOCK_DGRAM, 0)) < 0) {
          if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT) {
!             if ((sock = socket0(AF_INET6, SOCK_DGRAM, 0)) < 0) {
                  JNU_ThrowByNameWithMessageAndLastError
                      (env, JNU_JAVANETPKG "SocketException", "IPV6 Socket creation failed");
                  return -1;
              }
          } else { // errno is not NOSUPPORT