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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2020, 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 https://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:  ***************************************************************************/
   22: #include "curl_setup.h"
   23: #include <curl/curl.h>
   24: #include "testutil.h"
   25: #include "memdebug.h"
   26: 
   27: #if defined(WIN32) && !defined(MSDOS)
   28: 
   29: struct timeval tutil_tvnow(void)
   30: {
   31:   /*
   32:   ** GetTickCount() is available on _all_ Windows versions from W95 up
   33:   ** to nowadays. Returns milliseconds elapsed since last system boot,
   34:   ** increases monotonically and wraps once 49.7 days have elapsed.
   35:   */
   36:   struct timeval now;
   37:   DWORD milliseconds = GetTickCount();
   38:   now.tv_sec = milliseconds / 1000;
   39:   now.tv_usec = (milliseconds % 1000) * 1000;
   40:   return now;
   41: }
   42: 
   43: #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
   44: 
   45: struct timeval tutil_tvnow(void)
   46: {
   47:   /*
   48:   ** clock_gettime() is granted to be increased monotonically when the
   49:   ** monotonic clock is queried. Time starting point is unspecified, it
   50:   ** could be the system start-up time, the Epoch, or something else,
   51:   ** in any case the time starting point does not change once that the
   52:   ** system has started up.
   53:   */
   54:   struct timeval now;
   55:   struct timespec tsnow;
   56:   if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
   57:     now.tv_sec = tsnow.tv_sec;
   58:     now.tv_usec = tsnow.tv_nsec / 1000;
   59:   }
   60:   /*
   61:   ** Even when the configure process has truly detected monotonic clock
   62:   ** availability, it might happen that it is not actually available at
   63:   ** run-time. When this occurs simply fallback to other time source.
   64:   */
   65: #ifdef HAVE_GETTIMEOFDAY
   66:   else
   67:     (void)gettimeofday(&now, NULL);
   68: #else
   69:   else {
   70:     now.tv_sec = (long)time(NULL);
   71:     now.tv_usec = 0;
   72:   }
   73: #endif
   74:   return now;
   75: }
   76: 
   77: #elif defined(HAVE_GETTIMEOFDAY)
   78: 
   79: struct timeval tutil_tvnow(void)
   80: {
   81:   /*
   82:   ** gettimeofday() is not granted to be increased monotonically, due to
   83:   ** clock drifting and external source time synchronization it can jump
   84:   ** forward or backward in time.
   85:   */
   86:   struct timeval now;
   87:   (void)gettimeofday(&now, NULL);
   88:   return now;
   89: }
   90: 
   91: #else
   92: 
   93: struct timeval tutil_tvnow(void)
   94: {
   95:   /*
   96:   ** time() returns the value of time in seconds since the Epoch.
   97:   */
   98:   struct timeval now;
   99:   now.tv_sec = (long)time(NULL);
  100:   now.tv_usec = 0;
  101:   return now;
  102: }
  103: 
  104: #endif
  105: 
  106: /*
  107:  * Make sure that the first argument is the more recent time, as otherwise
  108:  * we'll get a weird negative time-diff back...
  109:  *
  110:  * Returns: the time difference in number of milliseconds.
  111:  */
  112: long tutil_tvdiff(struct timeval newer, struct timeval older)
  113: {
  114:   return (long)(newer.tv_sec-older.tv_sec)*1000+
  115:     (long)(newer.tv_usec-older.tv_usec)/1000;
  116: }
  117: 
  118: 
  119: /*
  120:  * Same as tutil_tvdiff but with full usec resolution.
  121:  *
  122:  * Returns: the time difference in seconds with subsecond resolution.
  123:  */
  124: double tutil_tvdiff_secs(struct timeval newer, struct timeval older)
  125: {
  126:   if(newer.tv_sec != older.tv_sec)
  127:     return (double)(newer.tv_sec-older.tv_sec)+
  128:       (double)(newer.tv_usec-older.tv_usec)/1000000.0;
  129:   return (double)(newer.tv_usec-older.tv_usec)/1000000.0;
  130: }