Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3 @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
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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 - 2018, 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_WRITEFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_WRITEFUNCTION \- set callback for writing received data
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26 .SH SYNOPSIS
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27 .nf
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28 #include <curl/curl.h>
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30 size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata);
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32 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEFUNCTION, write_callback);
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33 .SH DESCRIPTION
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34 Pass a pointer to your callback function, which should match the prototype
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35 shown above.
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37 This callback function gets called by libcurl as soon as there is data
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38 received that needs to be saved. For most transfers, this callback gets called
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39 many times and each invoke delivers another chunk of data. \fIptr\fP points to
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40 the delivered data, and the size of that data is \fInmemb\fP; \fIsize\fP is
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41 always 1.
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42
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43 The callback function will be passed as much data as possible in all invokes,
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44 but you must not make any assumptions. It may be one byte, it may be
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45 thousands. The maximum amount of body data that will be passed to the write
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46 callback is defined in the curl.h header file: \fICURL_MAX_WRITE_SIZE\fP (the
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47 usual default is 16K). If \fICURLOPT_HEADER(3)\fP is enabled, which makes
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48 header data get passed to the write callback, you can get up to
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49 \fICURL_MAX_HTTP_HEADER\fP bytes of header data passed into it. This usually
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50 means 100K.
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52 This function may be called with zero bytes data if the transferred file is
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53 empty.
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55 The data passed to this function will not be zero terminated!
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57 Set the \fIuserdata\fP argument with the \fICURLOPT_WRITEDATA(3)\fP option.
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59 Your callback should return the number of bytes actually taken care of. If
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60 that amount differs from the amount passed to your callback function, it'll
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61 signal an error condition to the library. This will cause the transfer to get
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62 aborted and the libcurl function used will return \fICURLE_WRITE_ERROR\fP.
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64 If your callback function returns CURL_WRITEFUNC_PAUSE it will cause this
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65 transfer to become paused. See \fIcurl_easy_pause(3)\fP for further details.
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67 Set this option to NULL to get the internal default function used instead of
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68 your callback. The internal default function will write the data to the FILE *
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69 given with \fICURLOPT_WRITEDATA(3)\fP.
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70 .SH DEFAULT
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71 libcurl will use 'fwrite' as a callback by default.
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72 .SH PROTOCOLS
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73 For all protocols
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74 .SH AVAILABILITY
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75 Support for the CURL_WRITEFUNC_PAUSE return code was added in version 7.18.0.
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76 .SH RETURN VALUE
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77 This will return CURLE_OK.
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78 .SH EXAMPLE
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79 A common technique is to use this callback to store the incoming data into a
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80 dynamically growing allocated buffer. Like in the getinmemory example:
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81 https://curl.haxx.se/libcurl/c/getinmemory.html
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82 .SH "SEE ALSO"
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83 .BR CURLOPT_WRITEDATA "(3), " CURLOPT_READFUNCTION "(3), "