components/nacl/loader/nonsfi/irt_basic.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 <sched.h>
   7 #include <stdlib.h>
   8 #include <sys/time.h>
   9 #include <time.h>
  10 #include <unistd.h>
  11
  12 #include "components/nacl/loader/nonsfi/abi_conversion.h"
  13 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  14 #include "components/nacl/loader/nonsfi/irt_util.h"
  15 #include "native_client/src/trusted/service_runtime/include/sys/time.h"
  16 #include "native_client/src/trusted/service_runtime/include/sys/unistd.h"
  17
  18 namespace nacl {
  19 namespace nonsfi {
  20 namespace {
  21
  22 void IrtExit(int status) {
  23   _exit(status);
  24 }
  25
  26 int IrtGetToD(struct nacl_abi_timeval* tv) {
  27   struct timeval host_tv;
  28   if (gettimeofday(&host_tv, NULL))
  29     return errno;
  30   tv->nacl_abi_tv_sec = host_tv.tv_sec;
  31   tv->nacl_abi_tv_usec = host_tv.tv_usec;
  32   return 0;
  33 }
  34
  35 int IrtClock(nacl_abi_clock_t* ticks) {
  36   // There is no definition of errno when clock is failed.
  37   // So we assume it always succeeds.
  38   *ticks = clock();
  39   return 0;
  40 }
  41
  42 int IrtNanoSleep(const struct nacl_abi_timespec* req,
  43                  struct nacl_abi_timespec* rem) {
  44   struct timespec host_req;
  45   NaClAbiTimeSpecToTimeSpec(*req, &host_req);
  46   struct timespec host_rem;
  47   if (nanosleep(&host_req, &host_rem))
  48     return errno;
  49
  50   if (rem)
  51     TimeSpecToNaClAbiTimeSpec(host_rem, rem);
  52   return 0;
  53 }
  54
  55 int IrtSchedYield() {
  56   return CheckError(sched_yield());
  57 }
  58
  59 int IrtSysconf(int name, int* value) {
  60   int result;
  61   switch (name) {
  62     case NACL_ABI__SC_NPROCESSORS_ONLN:
  63       errno = 0;
  64       result = sysconf(_SC_NPROCESSORS_ONLN);
  65       break;
  66     case NACL_ABI__SC_PAGESIZE:
  67       errno = 0;
  68       result = sysconf(_SC_PAGESIZE);
  69       break;
  70     default:
  71       return EINVAL;
  72   }
  73
  74   if (result == -1 && errno == EINVAL)
  75     return EINVAL;
  76
  77   *value = result;
  78   return 0;
  79 }
  80
  81 }  // namespace
  82
  83 // For gettod, clock and nanosleep, their argument types should be nacl_abi_X,
  84 // rather than host type, such as timeval or clock_t etc. However, the
  85 // definition of nacl_irt_basic uses host types, so here we need to cast them.
  86 const nacl_irt_basic kIrtBasic = {
  87   IrtExit,
  88   reinterpret_cast<int(*)(struct timeval*)>(IrtGetToD),
  89   reinterpret_cast<int(*)(clock_t*)>(IrtClock),
  90   reinterpret_cast<int(*)(const struct timespec*, struct timespec*)>(
  91       IrtNanoSleep),
  92   IrtSchedYield,
  93   IrtSysconf,
  94 };
  95
  96 }  // namespace nonsfi
  97 }  // namespace nacl