Line data    Source code

       1             : /* Copyright (c) 2003-2004, Roger Dingledine
       2             :  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
       3             :  * Copyright (c) 2007-2021, The Tor Project, Inc. */
       4             : /* See LICENSE for licensing information */
       5             : 
       6             : /**
       7             :  * \file tor_gettimeofday.c
       8             :  * \brief Implementat gettimeofday() for windows, and other platforms without
       9             :  *   it.
      10             :  **/
      11             : 
      12             : #include "orconfig.h"
      13             : #include "lib/err/torerr.h"
      14             : #include "lib/wallclock/tor_gettimeofday.h"
      15             : #include "lib/cc/torint.h"
      16             : 
      17             : #include <stddef.h>
      18             : #include <stdlib.h>
      19             : 
      20             : #ifdef HAVE_SYS_TIME_H
      21             : #include <sys/time.h>
      22             : #endif
      23             : 
      24             : #ifdef _WIN32
      25             : #include <windows.h>
      26             : #endif
      27             : 
      28             : #ifdef HAVE_SYS_TYPES_H
      29             : #include <sys/types.h>
      30             : #endif
      31             : 
      32             : #ifndef HAVE_GETTIMEOFDAY
      33             : #ifdef HAVE_FTIME
      34             : #include <sys/timeb.h>
      35             : #endif
      36             : #endif
      37             : 
      38             : /** Set *timeval to the current time of day.  On error, log and terminate.
      39             :  * (Same as gettimeofday(timeval,NULL), but never returns -1.)
      40             :  */
      41       11125 : MOCK_IMPL(void,
      42             : tor_gettimeofday, (struct timeval *timeval))
      43             : {
      44             : #ifdef _WIN32
      45             :   /* Epoch bias copied from perl: number of units between windows epoch and
      46             :    * Unix epoch. */
      47             : #define EPOCH_BIAS UINT64_C(116444736000000000)
      48             : #define UNITS_PER_SEC UINT64_C(10000000)
      49             : #define USEC_PER_SEC UINT64_C(1000000)
      50             : #define UNITS_PER_USEC UINT64_C(10)
      51             :   union {
      52             :     uint64_t ft_64;
      53             :     FILETIME ft_ft;
      54             :   } ft;
      55             :   /* number of 100-nsec units since Jan 1, 1601 */
      56             :   GetSystemTimeAsFileTime(&ft.ft_ft);
      57             :   if (ft.ft_64 < EPOCH_BIAS) {
      58             :     /* LCOV_EXCL_START */
      59             :     raw_assert_unreached_msg("System time is before 1970; failing.");
      60             :     /* LCOV_EXCL_STOP */
      61             :   }
      62             :   ft.ft_64 -= EPOCH_BIAS;
      63             :   timeval->tv_sec = (unsigned) (ft.ft_64 / UNITS_PER_SEC);
      64             :   timeval->tv_usec = (unsigned) ((ft.ft_64 / UNITS_PER_USEC) % USEC_PER_SEC);
      65             : #elif defined(HAVE_GETTIMEOFDAY)
      66       11125 :   if (gettimeofday(timeval, NULL)) {
      67             :     /* LCOV_EXCL_START */
      68             :     /* If gettimeofday dies, we have either given a bad timezone (we didn't),
      69             :        or segfaulted.*/
      70             :     raw_assert_unreached_msg("gettimeofday failed");
      71             :     /* LCOV_EXCL_STOP */
      72             :   }
      73             : #elif defined(HAVE_FTIME)
      74             :   struct timeb tb;
      75             :   ftime(&tb);
      76             :   timeval->tv_sec = tb.time;
      77             :   timeval->tv_usec = tb.millitm * 1000;
      78             : #else
      79             : #error "No way to get time."
      80             : #endif /* defined(_WIN32) || ... */
      81       11125 :   return;
      82             : }