Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_SOCKOPTFUNCTION.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +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 - 2017, 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_SOCKOPTFUNCTION 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_SOCKOPTFUNCTION \- set callback for setting socket options
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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 typedef enum {
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31 CURLSOCKTYPE_IPCXN, /* socket created for a specific IP connection */
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32 CURLSOCKTYPE_ACCEPT, /* socket created by accept() call */
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33 CURLSOCKTYPE_LAST /* never use */
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34 } curlsocktype;
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36 #define CURL_SOCKOPT_OK 0
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37 #define CURL_SOCKOPT_ERROR 1 /* causes libcurl to abort and return
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38 CURLE_ABORTED_BY_CALLBACK */
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39 #define CURL_SOCKOPT_ALREADY_CONNECTED 2
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41 int sockopt_callback(void *clientp,
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42 curl_socket_t curlfd,
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43 curlsocktype purpose);
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45 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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46 .SH DESCRIPTION
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47 Pass a pointer to your callback function, which should match the prototype
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48 shown above.
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49
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50 When set, this callback function gets called by libcurl when the socket has
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51 been created, but before the connect call to allow applications to change
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52 specific socket options. The callback's \fIpurpose\fP argument identifies the
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53 exact purpose for this particular socket:
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54
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55 \fICURLSOCKTYPE_IPCXN\fP for actively created connections or since 7.28.0
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56 \fICURLSOCKTYPE_ACCEPT\fP for FTP when the connection was setup with PORT/EPSV
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57 (in earlier versions these sockets weren't passed to this callback).
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58
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59 Future versions of libcurl may support more purposes. libcurl passes the newly
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60 created socket descriptor to the callback in the \fIcurlfd\fP parameter so
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61 additional setsockopt() calls can be done at the user's discretion.
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62
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63 The \fIclientp\fP pointer contains whatever user-defined value set using the
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64 \fICURLOPT_SOCKOPTDATA(3)\fP function.
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65
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66 Return \fICURL_SOCKOPT_OK\fP from the callback on success. Return
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67 \fICURL_SOCKOPT_ERROR\fP from the callback function to signal an unrecoverable
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68 error to the library and it will close the socket and return
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69 \fICURLE_COULDNT_CONNECT\fP.
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70 Alternatively, the callback function can return
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71 \fICURL_SOCKOPT_ALREADY_CONNECTED\fP, to tell libcurl that the socket is
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72 already connected and then libcurl will not attempt to connect it. This allows
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73 an application to pass in an already connected socket with
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74 \fICURLOPT_OPENSOCKETFUNCTION(3)\fP and then have this function make libcurl
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75 not attempt to connect (again).
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76 .SH DEFAULT
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77 By default, this callback is NULL and unused.
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78 .SH PROTOCOLS
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79 All
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80 .SH EXAMPLE
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81 .nf
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82 /* make libcurl use the already established socket 'sockfd' */
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83
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84 static curl_socket_t opensocket(void *clientp,
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85 curlsocktype purpose,
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86 struct curl_sockaddr *address)
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87 {
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88 curl_socket_t sockfd;
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89 sockfd = *(curl_socket_t *)clientp;
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90 /* the actual externally set socket is passed in via the OPENSOCKETDATA
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91 option */
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92 return sockfd;
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93 }
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94
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95 static int sockopt_callback(void *clientp, curl_socket_t curlfd,
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96 curlsocktype purpose)
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97 {
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98 /* This return code was added in libcurl 7.21.5 */
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99 return CURL_SOCKOPT_ALREADY_CONNECTED;
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100 }
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101
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102 curl = curl_easy_init();
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103 if(curl) {
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104 /* libcurl will internally think that you connect to the host
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105 * and port that you specify in the URL option. */
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106 curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
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107 /* call this function to get a socket */
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108 curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
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109 curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
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110
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111 /* call this function to set options for the socket */
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112 curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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113
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114 res = curl_easy_perform(curl);
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115
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116 curl_easy_cleanup(curl);
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117 .fi
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118 .SH AVAILABILITY
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119 Added in 7.16.0. The \fICURL_SOCKOPT_ALREADY_CONNECTED\fP return code was
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120 added in 7.21.5.
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121 .SH RETURN VALUE
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122 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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123 .SH "SEE ALSO"
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124 .BR CURLOPT_SOCKOPTDATA "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "