plumb glibc clock_get interfaces to irt

sysdeps/nacl/irt.h

 /*
  * Copyright (c) 2011 The Native Client 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 NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H_
 #define NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H_
 
 #include <stddef.h>
 #include <sys/types.h>
@@ skipping 130 matching lines @@
 struct nacl_irt_ppapihook {
   int (*ppapi_start)(const struct PP_StartFunctions *);
   void (*ppapi_register_thread_creator)(const struct PP_ThreadFunctions *);
 };
 
 #define NACL_IRT_RESOURCE_OPEN_v0_1 "nacl-irt-resource-open-0.1"
 struct nacl_irt_resource_open {
   int (*open_resource)(const char *file, int *fd);
 };
 
+#define NACL_IRT_CLOCK_v0_1 "nacl-irt-clock_get-0.1"
+struct nacl_irt_clock {
+  int (*getres)(clockid_t clk_id, struct timespec *res);
+  int (*gettime)(clockid_t clk_id, struct timespec *tp);
+};
+
 #if __cplusplus
 }
 #endif
 
 #endif /* NATIVE_CLIENT_SRC_UNTRUSTED_IRT_IRT_H */