1                 : /*
       2                 :  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
       3                 :  * Use of this source code is governed by a BSD-style license that can be
       4                 :  * found in the LICENSE file.
       5                 :  */
       6                 : 
       7                 : #include <time.h>
       8                 : #include <errno.h>
       9                 : 
      10                 : #include "native_client/src/shared/platform/nacl_clock.h"
      11                 : 
      12                 : #include "native_client/src/include/nacl_macros.h"
      13                 : #include "native_client/src/shared/platform/nacl_host_desc.h"
      14                 : #include "native_client/src/shared/platform/nacl_log.h"
      15                 : #include "native_client/src/trusted/service_runtime/include/sys/errno.h"
      16                 : 
      17                 : /*
      18                 :  * Linux is POSIX.1-2001 compliant, so the clock functions are trivial
      19                 :  * mappings -- essentially we just translate NaCl ABI enums and
      20                 :  * errnos.
      21                 :  */
      22                 : static int g_NaClClock_is_initialized = 0;
      23                 : 
      24             349 : int NaClClockInit(void) { g_NaClClock_is_initialized = 1; return 1; }
      25              57 : void NaClClockFini(void) {}
      26                 : 
      27               8 : int NaClClockGetRes(nacl_clockid_t            clk_id,
      28                 :                     struct nacl_abi_timespec  *res) {
      29               8 :   int             rv = -NACL_ABI_EINVAL;
      30                 :   struct timespec host_res;
      31                 :   clockid_t       host_clk_id;
      32                 : 
      33               8 :   if (!g_NaClClock_is_initialized) {
      34               0 :     NaClLog(LOG_FATAL,
      35                 :             "NaClClockGetRes invoked without successful NaClClockInit\n");
      36                 :   }
      37               8 :   switch (clk_id) {
      38                 :     case NACL_CLOCK_REALTIME:
      39               2 :       host_clk_id = CLOCK_REALTIME;
      40               2 :       rv = 0;
      41               2 :       break;
      42                 :     case NACL_CLOCK_MONOTONIC:
      43               2 :       host_clk_id = CLOCK_MONOTONIC;
      44               2 :       rv = 0;
      45               2 :       break;
      46                 :     case NACL_CLOCK_PROCESS_CPUTIME_ID:
      47               2 :       host_clk_id = CLOCK_PROCESS_CPUTIME_ID;
      48               2 :       rv = 0;
      49               2 :       break;
      50                 :     case NACL_CLOCK_THREAD_CPUTIME_ID:
      51               2 :       host_clk_id = CLOCK_THREAD_CPUTIME_ID;
      52               2 :       rv = 0;
      53               2 :       break;
      54                 :   }
      55               8 :   if (0 == rv) {
      56               8 :     if (0 != clock_getres(host_clk_id, &host_res)) {
      57               0 :       rv = -NaClXlateErrno(errno);
      58                 :     }
      59                 :   }
      60               8 :   if (0 == rv) {
      61               8 :     res->tv_sec = host_res.tv_sec;
      62               8 :     res->tv_nsec = host_res.tv_nsec;
      63                 :   }
      64               8 :   return rv;
      65                 : }
      66                 : 
      67          404251 : int NaClClockGetTime(nacl_clockid_t            clk_id,
      68                 :                      struct nacl_abi_timespec  *tp) {
      69          404251 :   int             rv = -NACL_ABI_EINVAL;
      70                 :   struct timespec host_time;
      71                 : 
      72          404251 :   if (!g_NaClClock_is_initialized) {
      73               0 :     NaClLog(LOG_FATAL,
      74                 :             "NaClClockGetTime invoked without successful NaClClockInit\n");
      75                 :   }
      76          404251 :   switch (clk_id) {
      77                 :     case NACL_CLOCK_REALTIME:
      78               9 :       if (0 != clock_gettime(CLOCK_REALTIME, &host_time)) {
      79               0 :         rv = -NaClXlateErrno(errno);
      80                 :       } else {
      81               9 :         rv = 0;
      82                 :       }
      83               9 :       break;
      84                 :     case NACL_CLOCK_MONOTONIC:
      85          404216 :       if (0 != clock_gettime(CLOCK_MONOTONIC, &host_time)) {
      86               0 :         rv = -NaClXlateErrno(errno);
      87                 :       } else {
      88          404216 :         rv = 0;
      89                 :       }
      90          404216 :       break;
      91                 :     case NACL_CLOCK_PROCESS_CPUTIME_ID:
      92                 :       /*
      93                 :        * This will include the time spent in an TCB-private service thread
      94                 :        * as well as the actual user threads. This not a major issue given
      95                 :        * all the trade-offs of implementing the proper semantics, but it is
      96                 :        * worth noting that the return value might be somewhat different from
      97                 :        * what this would be in a real POSIX OS.
      98                 :        */
      99              13 :       if (0 != clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &host_time)) {
     100               0 :         rv = -NaClXlateErrno(errno);
     101                 :       } else {
     102              13 :         rv = 0;
     103                 :       }
     104              13 :       break;
     105                 :     case NACL_CLOCK_THREAD_CPUTIME_ID:
     106              13 :       if (0 != clock_gettime(CLOCK_THREAD_CPUTIME_ID, &host_time)) {
     107               0 :         rv = -NaClXlateErrno(errno);
     108                 :       } else {
     109              13 :         rv = 0;
     110                 :       }
     111              13 :       break;
     112                 :   }
     113          404251 :   if (0 == rv) {
     114          404251 :     tp->tv_sec = host_time.tv_sec;
     115          404251 :     tp->tv_nsec = host_time.tv_nsec;
     116                 :   }
     117          404251 :   return rv;
     118                 : }