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

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 263         JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", msg);
 264         break;
 265     default:
 266         errno = errorNumber;
 267         JNU_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", msg);
 268         break;
 269     }
 270 }
 271 
 272 
 273 jfieldID
 274 NET_GetFileDescriptorID(JNIEnv *env)
 275 {
 276     jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
 277     CHECK_NULL_RETURN(cls, NULL);
 278     return (*env)->GetFieldID(env, cls, "fd", "I");
 279 }
 280 
 281 jint  IPv4_supported()
 282 {
 283     int fd = socket(AF_INET, SOCK_STREAM, 0) ;
 284     if (fd < 0) {
 285         return JNI_FALSE;
 286     }
 287     close(fd);
 288     return JNI_TRUE;
 289 }
 290 
 291 #if defined(DONT_ENABLE_IPV6)
 292 jint  IPv6_supported()
 293 {
 294     return JNI_FALSE;
 295 }
 296 
 297 #else /* !DONT_ENABLE_IPV6 */
 298 
 299 jint  IPv6_supported()
 300 {
 301     int fd;
 302     void *ipv6_fn;
 303     SOCKETADDRESS sa;
 304     socklen_t sa_len = sizeof(SOCKETADDRESS);
 305 
 306     fd = socket(AF_INET6, SOCK_STREAM, 0) ;
 307     if (fd < 0) {
 308         /*




 263         JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", msg);
 264         break;
 265     default:
 266         errno = errorNumber;
 267         JNU_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", msg);
 268         break;
 269     }
 270 }
 271 
 272 
 273 jfieldID
 274 NET_GetFileDescriptorID(JNIEnv *env)
 275 {
 276     jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
 277     CHECK_NULL_RETURN(cls, NULL);
 278     return (*env)->GetFieldID(env, cls, "fd", "I");
 279 }
 280 
 281 jint  IPv4_supported()
 282 {


 283     return JNI_FALSE;



 284 }
 285 
 286 #if defined(DONT_ENABLE_IPV6)
 287 jint  IPv6_supported()
 288 {
 289     return JNI_FALSE;
 290 }
 291 
 292 #else /* !DONT_ENABLE_IPV6 */
 293 
 294 jint  IPv6_supported()
 295 {
 296     int fd;
 297     void *ipv6_fn;
 298     SOCKETADDRESS sa;
 299     socklen_t sa_len = sizeof(SOCKETADDRESS);
 300 
 301     fd = socket(AF_INET6, SOCK_STREAM, 0) ;
 302     if (fd < 0) {
 303         /*


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