lib/speedcheck.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2014, 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
  23 #include "curl_setup.h"
  24
  25 #include <curl/curl.h>
  26 #include "urldata.h"
  27 #include "sendf.h"
  28 #include "multiif.h"
  29 #include "speedcheck.h"
  30
  31 void Curl_speedinit(struct SessionHandle *data)
  32 {
  33   memset(&data->state.keeps_speed, 0, sizeof(struct timeval));
  34 }
  35
  36 CURLcode Curl_speedcheck(struct SessionHandle *data,
  37                          struct timeval now)
  38 {
  39   if((data->progress.current_speed >= 0) &&
  40      data->set.low_speed_time &&
  41      (Curl_tvlong(data->state.keeps_speed) != 0) &&
  42      (data->progress.current_speed < data->set.low_speed_limit)) {
  43     long howlong = Curl_tvdiff(now, data->state.keeps_speed);
  44     long nextcheck = (data->set.low_speed_time * 1000) - howlong;
  45
  46     /* We are now below the "low speed limit". If we are below it
  47        for "low speed time" seconds we consider that enough reason
  48        to abort the download. */
  49     if(nextcheck <= 0) {
  50       /* we have been this slow for long enough, now die */
  51       failf(data,
  52             "Operation too slow. "
  53             "Less than %ld bytes/sec transferred the last %ld seconds",
  54             data->set.low_speed_limit,
  55             data->set.low_speed_time);
  56       return CURLE_OPERATION_TIMEDOUT;
  57     }
  58     else {
  59       /* wait complete low_speed_time */
  60       Curl_expire_latest(data, nextcheck);
  61     }
  62   }
  63   else {
  64     /* we keep up the required speed all right */
  65     data->state.keeps_speed = now;
  66
  67     if(data->set.low_speed_limit)
  68       /* if there is a low speed limit enabled, we set the expire timer to
  69          make this connection's speed get checked again no later than when
  70          this time is up */
  71       Curl_expire_latest(data, data->set.low_speed_time*1000);
  72   }
  73   return CURLE_OK;
  74 }