[NaCl SDK] Second phase of enable glibc arm toolchain

native_client_sdk/src/libraries/nacl_io/kernel_wrap.h

 // 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.
 
 #ifndef LIBRARIES_NACL_IO_KERNEL_WRAP_H_
 #define LIBRARIES_NACL_IO_KERNEL_WRAP_H_
 
 #include <assert.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 
 #include "nacl_io/ossignal.h"
 #include "nacl_io/ossocket.h"
 #include "nacl_io/ostypes.h"
 #include "nacl_io/osutime.h"
 #include "sdk_util/macros.h"
 
-// Curently enable NaCl IO IRT Extension when using arm glibc (which
+#if defined(__native_client__) && defined(__GLIBC__)
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ == 9
+#define NACL_GLIBC_OLD
+#else
+#define NACL_GLIBC_NEW
+#endif
+#endif
+
+// Curently enable NaCl IO IRT Extension when using newer glibc (which
 // only supports this method interception).
-#if defined(__native_client__) && defined(__GLIBC__) && defined(__arm__)
+#if defined(NACL_GLIBC_NEW)
 # define NACL_IO_IRT_EXT 1
 #endif
 
 #if defined(__GLIBC__)
 #include <sys/cdefs.h>
 #define NOTHROW __THROW
 #else
 #define NOTHROW
 #endif
 
@@ skipping 119 matching lines @@
 ssize_t sendmsg(int fd, const struct msghdr* msg, int flags);
 int setsockopt(int fd, int lvl, int optname, const void* optval, socklen_t len);
 int shutdown(int fd, int how);
 int socket(int domain, int type, int protocol);
 int socketpair(int domain, int type, int protocl, int* sv);
 #endif  // PROVIDES_SOCKET_API
 
 EXTERN_C_END
 
 #endif  // LIBRARIES_NACL_IO_KERNEL_WRAP_H_