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

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 - 2019, 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_SOCKETFUNCTION 3 "3 Nov 2016" "libcurl 7.39.0" "curl_multi_setopt options"
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24 .SH NAME
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25 CURLMOPT_SOCKETFUNCTION \- callback informed about what to wait for
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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 int socket_callback(CURL *easy, /* easy handle */
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31 curl_socket_t s, /* socket */
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32 int what, /* describes the socket */
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33 void *userp, /* private callback pointer */
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34 void *socketp); /* private socket pointer */
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36 CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);
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37 .SH DESCRIPTION
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38 Pass a pointer to your callback function, which should match the prototype
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39 shown above.
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41 When the \fIcurl_multi_socket_action(3)\fP function is called, it informs the
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42 application about updates in the socket (file descriptor) status by doing
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43 none, one, or multiple calls to the \fBsocket_callback\fP. The callback
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44 function gets status updates with changes since the previous time the callback
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45 was called. If the given callback pointer is set to NULL, no callback will be
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46 called.
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47 .SH "CALLBACK ARGUMENTS"
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48 \fIeasy\fP identifies the specific transfer for which this update is related.
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49
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50 \fIs\fP is the specific socket this function invocation concerns. If the
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51 \fBwhat\fP argument is not CURL_POLL_REMOVE then it holds information about
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52 what activity on this socket the application is supposed to
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53 monitor. Subsequent calls to this callback might update the \fBwhat\fP bits
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54 for a socket that is already monitored.
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56 \fBuserp\fP is set with \fICURLMOPT_SOCKETDATA(3)\fP.
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57
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58 \fBsocketp\fP is set with \fIcurl_multi_assign(3)\fP or will be NULL.
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59
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60 The \fBwhat\fP parameter informs the callback on the status of the given
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61 socket. It can hold one of these values:
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62 .IP CURL_POLL_IN
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63 Wait for incoming data. For the socket to become readable.
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64 .IP CURL_POLL_OUT
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65 Wait for outgoing data. For the socket to become writable.
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66 .IP CURL_POLL_INOUT
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67 Wait for incoming and outgoing data. For the socket to become readable or
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68 writable.
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69 .IP CURL_POLL_REMOVE
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70 The specified socket/file descriptor is no longer used by libcurl.
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71 .SH DEFAULT
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72 NULL (no callback)
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73 .SH PROTOCOLS
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74 All
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75 .SH EXAMPLE
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76 .nf
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77 static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
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78 {
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79 GlobalInfo *g = (GlobalInfo*) cbp;
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80 SockInfo *fdp = (SockInfo*) sockp;
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81
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82 if(what == CURL_POLL_REMOVE) {
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83 remsock(fdp);
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84 }
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85 else {
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86 if(!fdp) {
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87 addsock(s, e, what, g);
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88 }
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89 else {
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90 setsock(fdp, s, e, what, g);
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91 }
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92 }
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93 return 0;
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94 }
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95
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96 main()
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97 {
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98 GlobalInfo setup;
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99 /* ... use socket callback and custom pointer */
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100 curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
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101 curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
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102 }
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103 .fi
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104 .SH AVAILABILITY
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105 Added in 7.15.4
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106 .SH RETURN VALUE
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107 Returns CURLM_OK.
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108 .SH "SEE ALSO"
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109 .BR CURLMOPT_SOCKETDATA "(3), " curl_multi_socket_action "(3), "
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110 .BR CURLMOPT_TIMERFUNCTION "(3) "