1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 ***************************************************************************/
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
31void Curl_speedinit(struct SessionHandle *data)
32{
33  memset(&data->state.keeps_speed, 0, sizeof(struct timeval));
34}
35
36CURLcode 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(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(data, data->set.low_speed_time*1000);
72  }
73  return CURLE_OK;
74}
75