components/nacl/loader/nonsfi/irt_clock.cc

   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 <errno.h>
   6 #include <time.h>
   7
   8 #include "components/nacl/loader/nonsfi/abi_conversion.h"
   9 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  10 #include "native_client/src/trusted/service_runtime/include/sys/time.h"
  11
  12 namespace nacl {
  13 namespace nonsfi {
  14 namespace {
  15
  16 bool NaClAbiClockIdToClockId(nacl_irt_clockid_t nacl_clk_id,
  17                              clockid_t* host_clk_id) {
  18   switch (nacl_clk_id) {
  19     case NACL_ABI_CLOCK_REALTIME:
  20       *host_clk_id = CLOCK_REALTIME;
  21       break;
  22     case NACL_ABI_CLOCK_MONOTONIC:
  23       *host_clk_id = CLOCK_MONOTONIC;
  24       break;
  25     case NACL_ABI_CLOCK_PROCESS_CPUTIME_ID:
  26       *host_clk_id = CLOCK_PROCESS_CPUTIME_ID;
  27       break;
  28     case NACL_ABI_CLOCK_THREAD_CPUTIME_ID:
  29       *host_clk_id = CLOCK_THREAD_CPUTIME_ID;
  30       break;
  31     default:
  32       // Unknown clock id.
  33       return false;
  34   }
  35   return true;
  36 }
  37
  38 int IrtClockGetRes(nacl_irt_clockid_t clk_id, struct nacl_abi_timespec* res) {
  39   clockid_t host_clk_id;
  40   if (!NaClAbiClockIdToClockId(clk_id, &host_clk_id))
  41     return EINVAL;
  42
  43   struct timespec host_res;
  44   if (clock_getres(host_clk_id, &host_res))
  45     return errno;
  46
  47   // clock_getres() requires a NULL check but clock_gettime() doesn't.
  48   if (res)
  49     TimeSpecToNaClAbiTimeSpec(host_res, res);
  50   return 0;
  51 }
  52
  53 int IrtClockGetTime(nacl_irt_clockid_t clk_id, struct nacl_abi_timespec* tp) {
  54   clockid_t host_clk_id;
  55   if (!NaClAbiClockIdToClockId(clk_id, &host_clk_id))
  56     return EINVAL;
  57
  58   struct timespec host_tp;
  59   if (clock_gettime(host_clk_id, &host_tp))
  60     return errno;
  61
  62   TimeSpecToNaClAbiTimeSpec(host_tp, tp);
  63   return 0;
  64 }
  65
  66 }  // namespace
  67
  68 // Cast away the distinction between host types and NaCl ABI types.
  69 const nacl_irt_clock kIrtClock = {
  70   reinterpret_cast<int(*)(nacl_irt_clockid_t, struct timespec*)>(
  71       IrtClockGetRes),
  72   reinterpret_cast<int(*)(nacl_irt_clockid_t, struct timespec*)>(
  73       IrtClockGetTime),
  74 };
  75
  76 }  // namespace nonsfi
  77 }  // namespace nacl