Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLMOPT_PUSHFUNCTION.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
children
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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 - 2015, 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 CURLMOPT_PUSHFUNCTION 3 "1 Jun 2015" "libcurl 7.44.0" "curl_multi_setopt options"
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24 .SH NAME
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25 CURLMOPT_PUSHFUNCTION \- callback that approves or denies server pushes
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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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29
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30 char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num);
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31 char *curl_pushheader_byname(struct curl_pushheaders *h, const char *name);
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33 int curl_push_callback(CURL *parent,
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34 CURL *easy,
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35 size_t num_headers,
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36 struct curl_pushheaders *headers,
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37 void *userp);
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39 CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PUSHFUNCTION,
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40 curl_push_callback func);
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41 .fi
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42 .SH DESCRIPTION
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43 This callback gets called when a new HTTP/2 stream is being pushed by the
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44 server (using the PUSH_PROMISE frame). If no push callback is set, all offered
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45 pushes will be denied automatically.
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46 .SH CALLBACK DESCRIPTION
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47 The callback gets its arguments like this:
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48
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49 \fIparent\fP is the handle of the stream on which this push arrives. The new
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50 handle has been duphandle()d from the parent, meaning that it has gotten all
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51 its options inherited. It is then up to the application to alter any options
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52 if desired.
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53
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54 \fIeasy\fP is a newly created handle that represents this upcoming transfer.
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55
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56 \fInum_headers\fP is the number of name+value pairs that was received and can
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57 be accessed
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58
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59 \fIheaders\fP is a handle used to access push headers using the accessor
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60 functions described below. This only accesses and provides the PUSH_PROMISE
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61 headers, the normal response headers will be provided in the header callback
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62 as usual.
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64 \fIuserp\fP is the pointer set with \fICURLMOPT_PUSHDATA(3)\fP
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65
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66 If the callback returns CURL_PUSH_OK, the 'easy' handle will be added to the
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67 multi handle, the callback must not do that by itself.
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68
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69 The callback can access PUSH_PROMISE headers with two accessor
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70 functions. These functions can only be used from within this callback and they
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71 can only access the PUSH_PROMISE headers. The normal response headers will be
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72 passed to the header callback for pushed streams just as for normal streams.
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73 .IP curl_pushheader_bynum
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74 Returns the header at index 'num' (or NULL). The returned pointer points to a
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75 "name:value" string that will be freed when this callback returns.
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76 .IP curl_pushheader_byname
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77 Returns the value for the given header name (or NULL). This is a shortcut so
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78 that the application doesn't have to loop through all headers to find the one
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79 it is interested in. The data pointed will be freed when this callback
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80 returns. If more than one header field use the same name, this returns only
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81 the first one.
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82 .SH CALLBACK RETURN VALUE
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83 .IP "CURL_PUSH_OK (0)"
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84 The application has accepted the stream and it can now start receiving data,
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85 the ownership of the CURL handle has been taken over by the application.
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86 .IP "CURL_PUSH_DENY (1)"
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87 The callback denies the stream and no data for this will reach the
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88 application, the easy handle will be destroyed by libcurl.
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89 .IP *
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90 All other return codes are reserved for future use.
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91 .SH DEFAULT
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92 NULL, no callback
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93 .SH PROTOCOLS
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94 HTTP(S) (HTTP/2 only)
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95 .SH EXAMPLE
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96 .nf
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97 /* only allow pushes for file names starting with "push-" */
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98 int push_callback(CURL *parent,
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99 CURL *easy,
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100 size_t num_headers,
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101 struct curl_pushheaders *headers,
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102 void *userp)
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103 {
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104 char *headp;
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105 int *transfers = (int *)userp;
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106 FILE *out;
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107 headp = curl_pushheader_byname(headers, ":path");
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108 if(headp && !strncmp(headp, "/push-", 6)) {
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109 fprintf(stderr, "The PATH is %s\\n", headp);
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110
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111 /* save the push here */
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112 out = fopen("pushed-stream", "wb");
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113
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114 /* write to this file */
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115 curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
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116
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117 (*transfers)++; /* one more */
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118
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119 return CURL_PUSH_OK;
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120 }
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121 return CURL_PUSH_DENY;
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122 }
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123
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124 curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_callback);
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125 curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);
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126 .fi
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127 .SH AVAILABILITY
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128 Added in 7.44.0
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129 .SH RETURN VALUE
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130 Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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131 .SH "SEE ALSO"
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132 .BR CURLMOPT_PUSHDATA "(3), " CURLMOPT_PIPELINING "(3), " CURLOPT_PIPEWAIT "(3), "
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133 .BR RFC 7540