1 files changed, 31 insertions, 28 deletions

diff --git a/deps/uv/src/win/winsock.c b/deps/uv/src/win/winsock.c
index 2c3e49a103..47395bb89d 100644
--- a/deps/uv/src/win/winsock.c
+++ b/deps/uv/src/win/winsock.c
@@ -25,9 +25,6 @@
 #include "internal.h"
 
 
-/* Whether ipv6 is supported */
-int uv_allow_ipv6;
-
 /* Whether there are any non-IFS LSPs stacked on TCP */
 int uv_tcp_non_ifs_lsp_ipv4;
 int uv_tcp_non_ifs_lsp_ipv6;
@@ -75,6 +72,12 @@ BOOL uv_get_connectex_function(SOCKET socket, LPFN_CONNECTEX* target) {
 }
 
 
+static int error_means_no_support(DWORD error) {
+  return error == WSAEPROTONOSUPPORT || error == WSAESOCKTNOSUPPORT ||
+         error == WSAEPFNOSUPPORT || error == WSAEAFNOSUPPORT;
+}
+
+
 void uv_winsock_init() {
   const GUID wsaid_connectex            = WSAID_CONNECTEX;
   const GUID wsaid_acceptex             = WSAID_ACCEPTEX;
@@ -100,48 +103,48 @@ void uv_winsock_init() {
 
   /* Detect non-IFS LSPs */
   dummy = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
-  if (dummy == INVALID_SOCKET) {
-    uv_fatal_error(WSAGetLastError(), "socket");
-  }
 
-  opt_len = (int) sizeof protocol_info;
-  if (!getsockopt(dummy,
-                  SOL_SOCKET,
-                  SO_PROTOCOL_INFOW,
-                  (char*) &protocol_info,
-                  &opt_len) == SOCKET_ERROR) {
-    uv_fatal_error(WSAGetLastError(), "socket");
-  }
+  if (dummy != INVALID_SOCKET) {
+    opt_len = (int) sizeof protocol_info;
+    if (!getsockopt(dummy,
+                    SOL_SOCKET,
+                    SO_PROTOCOL_INFOW,
+                    (char*) &protocol_info,
+                    &opt_len) == SOCKET_ERROR)
+      uv_fatal_error(WSAGetLastError(), "getsockopt");
 
-  if (!(protocol_info.dwServiceFlags1 & XP1_IFS_HANDLES)) {
-    uv_tcp_non_ifs_lsp_ipv4 = 1;
-  }
+    if (!(protocol_info.dwServiceFlags1 & XP1_IFS_HANDLES))
+      uv_tcp_non_ifs_lsp_ipv4 = 1;
+
+    if (closesocket(dummy) == SOCKET_ERROR)
+      uv_fatal_error(WSAGetLastError(), "closesocket");
 
-  if (closesocket(dummy) == SOCKET_ERROR) {
-    uv_fatal_error(WSAGetLastError(), "closesocket");
+  } else if (!error_means_no_support(WSAGetLastError())) {
+    /* Any error other than "socket type not supported" is fatal. */
+    uv_fatal_error(WSAGetLastError(), "socket");
   }
 
   /* Detect IPV6 support and non-IFS LSPs */
   dummy = socket(AF_INET6, SOCK_STREAM, IPPROTO_IP);
-  if (dummy != INVALID_SOCKET) {
-    uv_allow_ipv6 = TRUE;
 
+  if (dummy != INVALID_SOCKET) {
     opt_len = (int) sizeof protocol_info;
     if (!getsockopt(dummy,
                     SOL_SOCKET,
                     SO_PROTOCOL_INFOW,
                     (char*) &protocol_info,
-                    &opt_len) == SOCKET_ERROR) {
-      uv_fatal_error(WSAGetLastError(), "socket");
-    }
+                    &opt_len) == SOCKET_ERROR)
+      uv_fatal_error(WSAGetLastError(), "getsockopt");
 
-    if (!(protocol_info.dwServiceFlags1 & XP1_IFS_HANDLES)) {
+    if (!(protocol_info.dwServiceFlags1 & XP1_IFS_HANDLES))
       uv_tcp_non_ifs_lsp_ipv6 = 1;
-    }
 
-    if (closesocket(dummy) == SOCKET_ERROR) {
+    if (closesocket(dummy) == SOCKET_ERROR)
       uv_fatal_error(WSAGetLastError(), "closesocket");
-    }
+
+  } else if (!error_means_no_support(WSAGetLastError())) {
+    /* Any error other than "socket type not supported" is fatal. */
+    uv_fatal_error(WSAGetLastError(), "socket");
   }
 }