CMakeLua/Utilities/cmcurl-7.19.0/src/curlutil.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id: curlutil.c,v 1.1.1.1 2008-09-23 16:32:06 hoffman Exp $
  22  ***************************************************************************/
  23
  24 #include "setup.h"
  25
  26 #include "curlutil.h"
  27
  28 #if defined(WIN32) && !defined(MSDOS)
  29
  30 struct timeval cutil_tvnow(void)
  31 {
  32   /*
  33   ** GetTickCount() is available on _all_ Windows versions from W95 up
  34   ** to nowadays. Returns milliseconds elapsed since last system boot,
  35   ** increases monotonically and wraps once 49.7 days have elapsed.
  36   */
  37   struct timeval now;
  38   DWORD milliseconds = GetTickCount();
  39   now.tv_sec = milliseconds / 1000;
  40   now.tv_usec = (milliseconds % 1000) * 1000;
  41   return now;
  42 }
  43
  44 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
  45
  46 struct timeval cutil_tvnow(void)
  47 {
  48   /*
  49   ** clock_gettime() is granted to be increased monotonically when the
  50   ** monotonic clock is queried. Time starting point is unspecified, it
  51   ** could be the system start-up time, the Epoch, or something else,
  52   ** in any case the time starting point does not change once that the
  53   ** system has started up.
  54   */
  55   struct timeval now;
  56   struct timespec tsnow;
  57   if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
  58     now.tv_sec = tsnow.tv_sec;
  59     now.tv_usec = tsnow.tv_nsec / 1000;
  60   }
  61   /*
  62   ** Even when the configure process has truly detected monotonic clock
  63   ** availability, it might happen that it is not actually available at
  64   ** run-time. When this occurs simply fallback to other time source.
  65   */
  66 #ifdef HAVE_GETTIMEOFDAY
  67   else
  68     (void)gettimeofday(&now, NULL);
  69 #else
  70   else {
  71     now.tv_sec = (long)time(NULL);
  72     now.tv_usec = 0;
  73   }
  74 #endif
  75   return now;
  76 }
  77
  78 #elif defined(HAVE_GETTIMEOFDAY)
  79
  80 struct timeval cutil_tvnow(void)
  81 {
  82   /*
  83   ** gettimeofday() is not granted to be increased monotonically, due to
  84   ** clock drifting and external source time synchronization it can jump
  85   ** forward or backward in time.
  86   */
  87   struct timeval now;
  88   (void)gettimeofday(&now, NULL);
  89   return now;
  90 }
  91
  92 #else
  93
  94 struct timeval cutil_tvnow(void)
  95 {
  96   /*
  97   ** time() returns the value of time in seconds since the Epoch.
  98   */
  99   struct timeval now;
 100   now.tv_sec = (long)time(NULL);
 101   now.tv_usec = 0;
 102   return now;
 103 }
 104
 105 #endif
 106
 107 /*
 108  * Make sure that the first argument is the more recent time, as otherwise
 109  * we'll get a weird negative time-diff back...
 110  *
 111  * Returns: the time difference in number of milliseconds.
 112  */
 113 long cutil_tvdiff(struct timeval newer, struct timeval older)
 114 {
 115   return (newer.tv_sec-older.tv_sec)*1000+
 116     (newer.tv_usec-older.tv_usec)/1000;
 117 }
 118
 119 /*
 120  * Same as cutil_tvdiff but with full usec resolution.
 121  *
 122  * Returns: the time difference in seconds with subsecond resolution.
 123  */
 124 double cutil_tvdiff_secs(struct timeval newer, struct timeval older)
 125 {
 126   return (double)(newer.tv_sec-older.tv_sec)+
 127     (double)(newer.tv_usec-older.tv_usec)/1000000.0;
 128 }
 129
 130 /* return the number of seconds in the given input timeval struct */
 131 long cutil_tvlong(struct timeval t1)
 132 {
 133   return t1.tv_sec;
 134 }
 135