Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_PROGRESSFUNCTION.3 @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_PROGRESSFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_PROGRESSFUNCTION \- callback to progress meter function
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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29 int progress_callback(void *clientp,
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30 double dltotal,
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31 double dlnow,
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32 double ultotal,
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33 double ulnow);
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35 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSFUNCTION, progress_callback);
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36 .SH DESCRIPTION
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37 Pass a pointer to your callback function, which should match the prototype
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38 shown above.
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39
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40 We encourage users to use the newer \fICURLOPT_XFERINFOFUNCTION(3)\fP instead,
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41 if you can.
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43 This function gets called by libcurl instead of its internal equivalent with a
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44 frequent interval. While data is being transferred it will be called very
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45 frequently, and during slow periods like when nothing is being transferred it
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46 can slow down to about one call per second.
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47
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48 \fIclientp\fP is the pointer set with \fICURLOPT_PROGRESSDATA(3)\fP, it is not
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49 used by libcurl but is only passed along from the application to the callback.
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51 The callback gets told how much data libcurl will transfer and has
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52 transferred, in number of bytes. \fIdltotal\fP is the total number of bytes
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53 libcurl expects to download in this transfer. \fIdlnow\fP is the number of
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54 bytes downloaded so far. \fIultotal\fP is the total number of bytes libcurl
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55 expects to upload in this transfer. \fIulnow\fP is the number of bytes
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56 uploaded so far.
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58 Unknown/unused argument values passed to the callback will be set to zero
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59 (like if you only download data, the upload size will remain 0). Many times
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60 the callback will be called one or more times first, before it knows the data
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61 sizes so a program must be made to handle that.
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63 Returning a non-zero value from this callback will cause libcurl to abort the
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64 transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
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65
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66 If you transfer data with the multi interface, this function will not be
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67 called during periods of idleness unless you call the appropriate libcurl
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68 function that performs transfers.
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69
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70 \fICURLOPT_NOPROGRESS(3)\fP must be set to 0 to make this function actually
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71 get called.
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72 .SH DEFAULT
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73 By default, libcurl has an internal progress meter. That's rarely wanted by
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74 users.
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75 .SH PROTOCOLS
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76 All
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77 .SH EXAMPLE
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78 https://curl.haxx.se/libcurl/c/progressfunc.html
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79 .SH AVAILABILITY
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80 Always
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81 .SH RETURN VALUE
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82 Returns CURLE_OK.
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83 .SH "SEE ALSO"
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84 .BR CURLOPT_VERBOSE "(3), " CURLOPT_NOPROGRESS "(3), "