* errno.cc (errmap): Map ERROR_BAD_NET_RESP to ENOSYS.

* fhandler_disk_file.cc (fhandler_disk_file::facl): Handle ENOSYS and
	point to  the explanation.
	* ntdll.h (STATUS_NOT_IMPLEMENTED): Define.
	* path.cc (symlink_info::check): Handle the inability of NT4 to use
	FileNetworkOpenInformation on share root dirs in either direction.
	* path.h (slash_unc_prefix_p): Remove unused declaration.
	* security.cc (get_info_from_sd): Handle ENOSYS from get_file_sd.
	Explain when this happens.

winsup/cygwin/ChangeLog

@@ -1,3 +1,15 @@
+2010-09-24  Corinna Vinschen  <corinna@vinschen.de>
+
+	* errno.cc (errmap): Map ERROR_BAD_NET_RESP to ENOSYS.
+	* fhandler_disk_file.cc (fhandler_disk_file::facl): Handle ENOSYS and
+	point to  the explanation.
+	* ntdll.h (STATUS_NOT_IMPLEMENTED): Define.
+	* path.cc (symlink_info::check): Handle the inability of NT4 to use
+	FileNetworkOpenInformation on share root dirs in either direction.
+	* path.h (slash_unc_prefix_p): Remove unused declaration.
+	* security.cc (get_info_from_sd): Handle ENOSYS from get_file_sd.
+	Explain when this happens.
+
 2010-09-23  Christopher Faylor  <me+cygwin@cgf.cx>
 
 	* autoload.cc (std_dll_init): Use correct format type when displaying

winsup/cygwin/errno.cc

@@ -39,6 +39,7 @@ static NO_COPY struct
   X (BAD_DEVICE,		ENODEV),
   X (BAD_NETPATH,		ENOENT),
   X (BAD_NET_NAME,		ENOENT),
+  X (BAD_NET_RESP,		ENOSYS),
   X (BAD_PATHNAME,		ENOENT),
   X (BAD_PIPE,			EINVAL),
   X (BAD_UNIT,			ENODEV),

winsup/cygwin/fhandler_disk_file.cc

@@ -1054,9 +1054,15 @@ cant_access_acl:
 	      set_errno(EFAULT);
 	    else
 	      res = getacl (get_stat_handle (), pc, nentries, aclbufp);
+	      /* For this ENOSYS case, see security.cc:get_file_attribute(). */
+	      if (res == -1 && get_errno () == ENOSYS)
+	      	goto cant_access_acl;
 	    break;
 	  case GETACLCNT:
 	    res = getacl (get_stat_handle (), pc, 0, NULL);
+	    /* Ditto. */
+	    if (res == -1 && get_errno () == ENOSYS)
+	      goto cant_access_acl;
 	    break;
 	  default:
 	    set_errno (EINVAL);

winsup/cygwin/ntdll.h

@@ -20,6 +20,7 @@
    define to avoid warnings. */
 #define STATUS_INVALID_INFO_CLASS     ((NTSTATUS) 0xc0000003)
 #endif
+#define STATUS_NOT_IMPLEMENTED        ((NTSTATUS) 0xc0000002)
 #define STATUS_INFO_LENGTH_MISMATCH   ((NTSTATUS) 0xc0000004)
 #define STATUS_INVALID_PARAMETER      ((NTSTATUS) 0xc000000d)
 #define STATUS_NO_SUCH_FILE           ((NTSTATUS) 0xc000000f)

winsup/cygwin/path.cc

@@ -2421,6 +2421,23 @@ restart:
 	    {
 	      status = NtQueryInformationFile (h, &io, pfnoi, sizeof *pfnoi,
 					       FileNetworkOpenInformation);
+	      if ((status == STATUS_INVALID_PARAMETER
+		   || status == STATUS_NOT_IMPLEMENTED)
+		  && RtlEqualUnicodePathPrefix (&upath, &ro_u_uncp, FALSE))
+	      	{
+		  /* This occurs when accessing SMB share root dirs hosted on
+		     NT4 (STATUS_INVALID_PARAMETER), or when trying to access
+		     SMB share root dirs from NT4 (STATUS_NOT_IMPLEMENTED). */
+		  status = NtQueryInformationFile (h, &io, &fbi, sizeof fbi,
+						   FileBasicInformation);
+		  if (NT_SUCCESS (status))
+		    {
+		      memcpy (pfnoi, &fbi, 4 * sizeof (LARGE_INTEGER));
+		      pfnoi->EndOfFile.QuadPart
+			= pfnoi->AllocationSize.QuadPart = 0;
+		      pfnoi->FileAttributes = fbi.FileAttributes;
+		    }
+		}
 	      if (NT_SUCCESS (status))
 		fileattr = pfnoi->FileAttributes;
 	    }

winsup/cygwin/path.h

@@ -343,8 +343,6 @@ class path_conv
 /* Interix symlink marker */
 #define INTERIX_SYMLINK_COOKIE  "IntxLNK\1"
 
-int __stdcall slash_unc_prefix_p (const char *path) __attribute__ ((regparm(1)));
-
 enum fe_types
 {
   FE_NADA = 0,		/* Nothing special */

winsup/cygwin/security.cc

@@ -358,7 +358,12 @@ get_file_attribute (HANDLE handle, path_conv &pc,
 	  get_info_from_sd (sd, attribute, uidret, gidret);
 	  return 0;
 	}
-      else
+      /* ENOSYS is returned by get_file_sd if fetching the DACL from a remote
+	 share returns STATUS_INVALID_NETWORK_RESPONSE, which in turn is
+	 converted to ERROR_BAD_NET_RESP.  This potentially occurs when trying
+	 to fetch DACLs from a NT4 machine which is not part of the domain of
+	 the requesting machine. */
+      else if (get_errno () != ENOSYS)
 	{
 	  if (uidret)
 	    *uidret = ILLEGAL_UID;