Implement nacl_irt_clock for non-sfi mode.

components/nacl/loader/nonsfi/irt_clock.cc

Index: components/nacl/loader/nonsfi/irt_clock.cc
diff --git a/components/nacl/loader/nonsfi/irt_clock.cc b/components/nacl/loader/nonsfi/irt_clock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2ad0ae1d9e53394ec833f7c8c4e02fe9c13a9f48
--- /dev/null
+++ b/components/nacl/loader/nonsfi/irt_clock.cc
@@ -0,0 +1,74 @@
+// Copyright 2014 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 <errno.h>
+#include <time.h>
+
+#include "components/nacl/loader/nonsfi/abi_conversion.h"
+#include "components/nacl/loader/nonsfi/irt_interfaces.h"
+#include "native_client/src/trusted/service_runtime/include/sys/time.h"
+
+namespace nacl {
+namespace nonsfi {
+namespace {
+
+bool NaClAbiClockIdToClockId(int nacl_clk_id, clockid_t* host_clk_id) {
+  switch (nacl_clk_id) {
+    case NACL_ABI_CLOCK_REALTIME:
+      *host_clk_id = CLOCK_REALTIME;
+      break;
+    case NACL_ABI_CLOCK_MONOTONIC:
+      *host_clk_id = CLOCK_MONOTONIC;
+      break;
+    case NACL_ABI_CLOCK_PROCESS_CPUTIME_ID:
+      *host_clk_id = CLOCK_PROCESS_CPUTIME_ID;
+      break;
+    case NACL_ABI_CLOCK_THREAD_CPUTIME_ID:
+      *host_clk_id = CLOCK_THREAD_CPUTIME_ID;
+      break;
+    default:
+      // Unknown clock id.
+      return false;
+  }
+  return true;
+}
+
+int IrtClockGetRes(int clk_id, struct nacl_abi_timespec* res) {
+  clockid_t host_clk_id;
+  if (!NaClAbiClockIdToClockId(clk_id, &host_clk_id))
+    return EINVAL;
+
+  struct timespec host_res;
+  if (clock_getres(host_clk_id, &host_res))
+    return errno;
+
+  // clock_getres() requires a NULL check but clock_gettime() doesn't.
+  if (res)
+    TimeSpecToNaClAbiTimeSpec(host_res, res);
+  return 0;
+}
+
+int IrtClockGetTime(int clk_id, struct nacl_abi_timespec* tp) {
+  clockid_t host_clk_id;
+  if (!NaClAbiClockIdToClockId(clk_id, &host_clk_id))
+    return EINVAL;
+
+  struct timespec host_tp;
+  if (clock_gettime(host_clk_id, &host_tp))
+    return errno;
+
+  TimeSpecToNaClAbiTimeSpec(host_tp, tp);
+  return 0;
+}
+
+}  // namespace
+
+// Cast away the distinction between host types and NaCl ABI types.
+const nacl_irt_clock kIrtClock = {
+  reinterpret_cast<int(*)(clockid_t, struct timespec*)>(IrtClockGetRes),
+  reinterpret_cast<int(*)(clockid_t, struct timespec*)>(IrtClockGetTime),
+};
+
+}  // namespace nonsfi
+}  // namespace nacl