[NaCl SDK] nacl_io: Fix inet_ntop to be consistent with glibc.

native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c

Index: native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
diff --git a/native_client_sdk/src/libraries/nacl_io/h_errno.cc b/native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
similarity index 57%
copy from native_client_sdk/src/libraries/nacl_io/h_errno.cc
copy to native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
index 5f328edd1696b41b848d451bca43b3581a70371d..604f07fcfa1edf98377cce88cd51ff20084fe848 100644
--- a/native_client_sdk/src/libraries/nacl_io/h_errno.cc
+++ b/native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
@@ -6,10 +6,15 @@
 
 #if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
 
-static __thread int __h_errno__;
+#include <string.h>
 
-extern "C" int *__h_errno_location() {
-  return &__h_errno__;
+in_addr_t inet_addr(const char* addr) {
+   struct in_addr rtn = { 0 };
+   int ret = inet_aton(addr, &rtn);
+   // inet_ntoa returns zero if addr is not valid
+   if (ret == 0)
+     return INADDR_NONE;
+   return rtn.s_addr;
 }
 
 #endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)