native_client_sdk/src/libraries/nacl_io/h_errno.c

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "nacl_io/ossocket.h"
   6
   7 #if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
   8
   9 #include <stdlib.h>
  10 #include <pthread.h>
  11
  12 static pthread_key_t s_h_errno_key;
  13 static pthread_once_t s_h_errno_once = PTHREAD_ONCE_INIT;
  14
  15 static void __h_errno_create(void) {
  16   pthread_key_create(&s_h_errno_key, NULL);
  17 }
  18
  19 int *__h_errno_location(void) {
  20   int* h_errno_ptr;
  21   pthread_once(&s_h_errno_once, __h_errno_create);
  22   h_errno_ptr = (int *) pthread_getspecific(s_h_errno_key);
  23
  24   if (NULL == h_errno_ptr) {
  25     h_errno_ptr = (int *) malloc(sizeof(int));
  26     pthread_setspecific(s_h_errno_key, h_errno_ptr);
  27     *h_errno_ptr = 0;
  28   }
  29
  30   return h_errno_ptr;
  31 }
  32
  33 #if defined(__BIONIC__)
  34 int *__get_h_errno(void) {
  35   return __h_errno_location();
  36 }
  37 #endif
  38
  39 #endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)