96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* $Id$ */
|
|
|
|
/* Copyright (C) 2008 by Daniel Stenberg et al
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation for any purpose and without fee is hereby granted, provided
|
|
* that the above copyright notice appear in all copies and that both that
|
|
* copyright notice and this permission notice appear in supporting
|
|
* documentation, and that the name of M.I.T. not be used in advertising or
|
|
* publicity pertaining to distribution of the software without specific,
|
|
* written prior permission. M.I.T. makes no representations about the
|
|
* suitability of this software for any purpose. It is provided "as is"
|
|
* without express or implied warranty.
|
|
*/
|
|
|
|
#include "setup.h"
|
|
#include "ares.h"
|
|
#include "ares_private.h"
|
|
|
|
#if defined(WIN32) && !defined(MSDOS)
|
|
|
|
struct timeval ares__tvnow(void)
|
|
{
|
|
/*
|
|
** GetTickCount() is available on _all_ Windows versions from W95 up
|
|
** to nowadays. Returns milliseconds elapsed since last system boot,
|
|
** increases monotonically and wraps once 49.7 days have elapsed.
|
|
*/
|
|
struct timeval now;
|
|
DWORD milliseconds = GetTickCount();
|
|
now.tv_sec = milliseconds / 1000;
|
|
now.tv_usec = (milliseconds % 1000) * 1000;
|
|
return now;
|
|
}
|
|
|
|
#elif defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
|
|
|
|
struct timeval ares__tvnow(void)
|
|
{
|
|
/*
|
|
** clock_gettime() is granted to be increased monotonically when the
|
|
** monotonic clock is queried. Time starting point is unspecified, it
|
|
** could be the system start-up time, the Epoch, or something else,
|
|
** in any case the time starting point does not change once that the
|
|
** system has started up.
|
|
*/
|
|
struct timeval now;
|
|
struct timespec tsnow;
|
|
(void)clock_gettime(CLOCK_MONOTONIC, &tsnow);
|
|
now.tv_sec = tsnow.tv_sec;
|
|
now.tv_usec = tsnow.tv_nsec / 1000;
|
|
return now;
|
|
}
|
|
|
|
#elif defined(HAVE_GETTIMEOFDAY)
|
|
|
|
struct timeval ares__tvnow(void)
|
|
{
|
|
/*
|
|
** gettimeofday() is not granted to be increased monotonically, due to
|
|
** clock drifting and external source time synchronization it can jump
|
|
** forward or backward in time.
|
|
*/
|
|
struct timeval now;
|
|
(void)gettimeofday(&now, NULL);
|
|
return now;
|
|
}
|
|
|
|
#else
|
|
|
|
struct timeval ares__tvnow(void)
|
|
{
|
|
/*
|
|
** time() returns the value of time in seconds since the Epoch.
|
|
*/
|
|
struct timeval now;
|
|
now.tv_sec = (long)time(NULL);
|
|
now.tv_usec = 0;
|
|
return now;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Make sure that the first argument is the more recent time, as otherwise
|
|
* we'll get a weird negative time-diff back...
|
|
*
|
|
* Returns: the time difference in number of milliseconds.
|
|
*/
|
|
long ares__tvdiff(struct timeval newer, struct timeval older)
|
|
{
|
|
return (newer.tv_sec-older.tv_sec)*1000+
|
|
(newer.tv_usec-older.tv_usec)/1000;
|
|
}
|
|
|