7118907: InetAddress.isReachable() should return false if sendto fails with EHOSTUNREACH

Reviewed-by: alanb, chegar
Contributed-by: NCharles Lee <littlee@linux.vnet.ibm.com>

src/solaris/native/java/net/Inet4AddressImpl.c

@@ -367,11 +367,11 @@ ping4(JNIEnv *env, jint fd, struct sockaddr_in* him, jint timeout,
                  sizeof(struct sockaddr));
       if (n < 0 && errno != EINPROGRESS ) {
 #ifdef __linux__
-        if (errno != EINVAL)
+        if (errno != EINVAL && errno != EHOSTUNREACH)
           /*
            * On some Linuxes, when bound to the loopback interface, sendto
-           * will fail and errno will be set to EINVAL. When that happens,
-           * don't throw an exception, just return false.
+           * will fail and errno will be set to EINVAL or EHOSTUNREACH.
+           * When that happens, don't throw an exception, just return false.
            */
 #endif /*__linux__ */
           NET_ThrowNew(env, errno, "Can't send ICMP packet");
@@ -525,10 +525,11 @@ Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this,
         case EADDRNOTAVAIL: /* address is not available on  the  remote machine */
 #ifdef __linux__
         case EINVAL:
+        case EHOSTUNREACH:
           /*
            * On some Linuxes, when bound to the loopback interface, connect
-           * will fail and errno will be set to EINVAL. When that happens,
-           * don't throw an exception, just return false.
+           * will fail and errno will be set to EINVAL or EHOSTUNREACH.
+           * When that happens, don't throw an exception, just return false.
            */
 #endif /* __linux__ */
           close(fd);

src/solaris/native/java/net/Inet6AddressImpl.c

@@ -502,11 +502,11 @@ ping6(JNIEnv *env, jint fd, struct sockaddr_in6* him, jint timeout,
       n = sendto(fd, sendbuf, plen, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));
       if (n < 0 && errno != EINPROGRESS) {
 #ifdef __linux__
-        if (errno != EINVAL)
+        if (errno != EINVAL && errno != EHOSTUNREACH)
           /*
            * On some Linuxes, when bound to the loopback interface, sendto
-           * will fail and errno will be set to EINVAL. When that happens,
-           * don't throw an exception, just return false.
+           * will fail and errno will be set to EINVAL or EHOSTUNREACH.
+           * When that happens, don't throw an exception, just return false.
            */
 #endif /*__linux__ */
         NET_ThrowNew(env, errno, "Can't send ICMP packet");
@@ -670,10 +670,11 @@ Java_java_net_Inet6AddressImpl_isReachable0(JNIEnv *env, jobject this,
         case EADDRNOTAVAIL: /* address is not available on  the  remote machine */
 #ifdef __linux__
         case EINVAL:
+        case EHOSTUNREACH:
           /*
            * On some Linuxes, when bound to the loopback interface, connect
-           * will fail and errno will be set to EINVAL. When that happens,
-           * don't throw an exception, just return false.
+           * will fail and errno will be set to EINVAL or EHOSTUNREACH.
+           * When that happens, don't throw an exception, just return false.
            */
 #endif /* __linux__ */
           close(fd);