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/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file tor_gettimeofday.c
* \brief Implementat gettimeofday() for windows, and other platforms without
* it.
**/
#include "orconfig.h"
#include "lib/err/torerr.h"
#include "lib/wallclock/tor_gettimeofday.h"
#include "lib/cc/torint.h"
#include <stddef.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef _WIN32
#include <windows.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifndef HAVE_GETTIMEOFDAY
#ifdef HAVE_FTIME
#include <sys/timeb.h>
#endif
#endif
/** Set *timeval to the current time of day. On error, log and terminate.
* (Same as gettimeofday(timeval,NULL), but never returns -1.)
*/
MOCK_IMPL(void,
tor_gettimeofday, (struct timeval *timeval))
{
#ifdef _WIN32
/* Epoch bias copied from perl: number of units between windows epoch and
* Unix epoch. */
#define EPOCH_BIAS UINT64_C(116444736000000000)
#define UNITS_PER_SEC UINT64_C(10000000)
#define USEC_PER_SEC UINT64_C(1000000)
#define UNITS_PER_USEC UINT64_C(10)
union {
uint64_t ft_64;
FILETIME ft_ft;
} ft;
/* number of 100-nsec units since Jan 1, 1601 */
GetSystemTimeAsFileTime(&ft.ft_ft);
if (ft.ft_64 < EPOCH_BIAS) {
/* LCOV_EXCL_START */
raw_assert_unreached_msg("System time is before 1970; failing.");
/* LCOV_EXCL_STOP */
}
ft.ft_64 -= EPOCH_BIAS;
timeval->tv_sec = (unsigned) (ft.ft_64 / UNITS_PER_SEC);
timeval->tv_usec = (unsigned) ((ft.ft_64 / UNITS_PER_USEC) % USEC_PER_SEC);
#elif defined(HAVE_GETTIMEOFDAY)
if (gettimeofday(timeval, NULL)) {
/* LCOV_EXCL_START */
/* If gettimeofday dies, we have either given a bad timezone (we didn't),
or segfaulted.*/
raw_assert_unreached_msg("gettimeofday failed");
/* LCOV_EXCL_STOP */
}
#elif defined(HAVE_FTIME)
struct timeb tb;
ftime(&tb);
timeval->tv_sec = tb.time;
timeval->tv_usec = tb.millitm * 1000;
#else
#error "No way to get time."
#endif /* defined(_WIN32) || ... */
return;
}
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