[NaCl SDK] Compile for naclio for Bionic

native_client_sdk/src/libraries/nacl_io/h_errno.cc

 // Copyright 2013 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/ossocket.h"
 
 #if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
 
-static __thread int __h_errno__;
+#include <stdlib.h>
+#include <pthread.h>
+
+static pthread_key_t __h_errno_key;
+static pthread_once_t __h_errno_once = PTHREAD_ONCE_INIT;
+
+static void __h_errno_create() {
+  pthread_key_create(&__h_errno_key, NULL);
+}
 
 extern "C" int *__h_errno_location() {

[Sam Clegg, 2014/03/27 00:10:02]

Make this into a .c file and drop the extern "C"s?

Or at least use the macros for adding extern "C".

[noelallen1, 2014/03/27 18:13:48]

Done.

-  return &__h_errno__;
+  int* h_errno_ptr;
+  pthread_once(&__h_errno_once, __h_errno_create);
+  h_errno_ptr = (int *) pthread_getspecific(__h_errno_key);
+
+  if (NULL == h_errno_ptr) {
+    h_errno_ptr = (int *) malloc(sizeof(int));
+    pthread_setspecific(__h_errno_key, h_errno_ptr);
+    *h_errno_ptr = 0;
+  }
+
+  return h_errno_ptr;
 }
 
+#if defined(__BIONIC__)
+extern "C" int *__get_h_errno() {
+  return __h_errno_location();
+}
+#endif
+
 #endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)