[NaCl SDK] nacl_io: Enable isatty running under sel_ldr.

native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/kernel_proxy.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
@@ skipping 558 matching lines @@
 int KernelProxy::fdatasync(int fd) {
   errno = ENOSYS;
   return -1;
 }
 
 int KernelProxy::isatty(int fd) {
   ScopedKernelHandle handle;
   Error error = AcquireHandle(fd, &handle);
   if (error) {
     errno = error;
-    return -1;
+    return 0;
   }
 
-  error = handle->node()->IsaTTY();
+  error = handle->node()->Isatty();
   if (error) {
     errno = error;
-    return -1;
+    return 0;
   }
 
-  return 0;
+  return 1;
 }
 
 int KernelProxy::ioctl(int fd, int request, va_list args) {
   ScopedKernelHandle handle;
   Error error = AcquireHandle(fd, &handle);
   if (error) {
     errno = error;
     return -1;
   }
 
@@ skipping 1030 matching lines @@
     errno = ENOTSOCK;
     return -1;
   }
 
   return 0;
 }
 
 #endif  // PROVIDES_SOCKET_API
 
 }  // namespace_nacl_io