Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_multi_socket.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
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 - 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 .TH curl_multi_socket 3 "9 Jul 2006" "libcurl 7.16.0" "libcurl Manual"
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23 .SH NAME
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24 curl_multi_socket \- reads/writes available data
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25 .SH SYNOPSIS
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26 .nf
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27 #include <curl/curl.h>
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28 CURLMcode curl_multi_socket(CURLM * multi_handle, curl_socket_t sockfd,
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29 int *running_handles);
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30
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31 CURLMcode curl_multi_socket_all(CURLM *multi_handle,
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32 int *running_handles);
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33 .fi
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34 .SH DESCRIPTION
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35 These functions are deprecated. Do not use! See
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36 \fIcurl_multi_socket_action(3)\fP instead!
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37
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38 At return, the integer \fBrunning_handles\fP points to will contain the number
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39 of still running easy handles within the multi handle. When this number
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40 reaches zero, all transfers are complete/done. Note that when you call
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41 \fIcurl_multi_socket_action(3)\fP on a specific socket and the counter
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42 decreases by one, it DOES NOT necessarily mean that this exact socket/transfer
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43 is the one that completed. Use \fIcurl_multi_info_read(3)\fP to figure out
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44 which easy handle that completed.
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45
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46 The \fIcurl_multi_socket_action(3)\fP functions inform the application about
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47 updates in the socket (file descriptor) status by doing none, one, or multiple
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48 calls to the socket callback function set with the
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49 \fICURLMOPT_SOCKETFUNCTION(3)\fP option to \fIcurl_multi_setopt(3)\fP. They
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50 update the status with changes since the previous time the callback was
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51 called.
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52
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53 Get the timeout time by setting the \fICURLMOPT_TIMERFUNCTION(3)\fP option
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54 with \fIcurl_multi_setopt(3)\fP. Your application will then get called with
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55 information on how long to wait for socket actions at most before doing the
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56 timeout action: call the \fIcurl_multi_socket_action(3)\fP function with the
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57 \fBsockfd\fP argument set to CURL_SOCKET_TIMEOUT. You can also use the
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58 \fIcurl_multi_timeout(3)\fP function to poll the value at any given time, but
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59 for an event-based system using the callback is far better than relying on
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60 polling the timeout value.
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61
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62 Usage of \fIcurl_multi_socket(3)\fP is deprecated, whereas the function is
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63 equivalent to \fIcurl_multi_socket_action(3)\fP with \fBev_bitmask\fP set to
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64 0.
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65
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66 Force libcurl to (re-)check all its internal sockets and transfers instead of
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67 just a single one by calling \fIcurl_multi_socket_all(3)\fP. Note that there
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68 should not be any reason to use this function!
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69 .SH "CALLBACK DETAILS"
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70
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71 The socket \fBcallback\fP function uses a prototype like this
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72 .nf
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73
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74 int curl_socket_callback(CURL *easy, /* easy handle */
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75 curl_socket_t s, /* socket */
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76 int action, /* see values below */
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77 void *userp, /* private callback pointer */
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78 void *socketp); /* private socket pointer */
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79
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80 .fi
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81 The callback MUST return 0.
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82
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83 The \fIeasy\fP argument is a pointer to the easy handle that deals with this
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84 particular socket. Note that a single handle may work with several sockets
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85 simultaneously.
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86
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87 The \fIs\fP argument is the actual socket value as you use it within your
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88 system.
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89
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90 The \fIaction\fP argument to the callback has one of five values:
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91 .RS
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92 .IP "CURL_POLL_NONE (0)"
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93 register, not interested in readiness (yet)
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94 .IP "CURL_POLL_IN (1)"
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95 register, interested in read readiness
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96 .IP "CURL_POLL_OUT (2)"
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97 register, interested in write readiness
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98 .IP "CURL_POLL_INOUT (3)"
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99 register, interested in both read and write readiness
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100 .IP "CURL_POLL_REMOVE (4)"
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101 unregister
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102 .RE
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103
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104 The \fIsocketp\fP argument is a private pointer you have previously set with
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105 \fIcurl_multi_assign(3)\fP to be associated with the \fIs\fP socket. If no
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106 pointer has been set, socketp will be NULL. This argument is of course a
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107 service to applications that want to keep certain data or structs that are
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108 strictly associated to the given socket.
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109
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110 The \fIuserp\fP argument is a private pointer you have previously set with
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111 \fIcurl_multi_setopt(3)\fP and the \fICURLMOPT_SOCKETDATA(3)\fP option.
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112 .SH "RETURN VALUE"
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113 CURLMcode type, general libcurl multi interface error code.
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114
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115 Legacy: If you receive \fICURLM_CALL_MULTI_PERFORM\fP, this basically means
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116 that you should call \fIcurl_multi_socket(3)\fP again, before you wait for
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117 more actions on libcurl's sockets. You don't have to do it immediately, but
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118 the return code means that libcurl may have more data available to return or
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119 that there may be more data to send off before it is "satisfied".
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120
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121 In modern libcurls, \fICURLM_CALL_MULTI_PERFORM\fP or
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122 \fICURLM_CALL_MULTI_SOCKET\fP should not be returned and no application needs
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123 to care about them.
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124
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125 NOTE that the return code is for the whole multi stack. Problems still might have
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126 occurred on individual transfers even when one of these functions
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127 return OK.
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128 .SH "TYPICAL USAGE"
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129 1. Create a multi handle
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130
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131 2. Set the socket callback with \fICURLMOPT_SOCKETFUNCTION(3)\fP
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132
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133 3. Set the timeout callback with \fICURLMOPT_TIMERFUNCTION(3)\fP, to get to
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134 know what timeout value to use when waiting for socket activities.
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135
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136 4. Add easy handles with curl_multi_add_handle()
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137
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138 5. Provide some means to manage the sockets libcurl is using, so you can check
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139 them for activity. This can be done through your application code, or by way
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140 of an external library such as libevent or glib.
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141
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142 6. Wait for activity on any of libcurl's sockets, use the timeout value your
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143 callback has been told
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144
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145 7, When activity is detected, call curl_multi_socket_action() for the
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146 socket(s) that got action. If no activity is detected and the timeout expires,
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147 call \fIcurl_multi_socket_action(3)\fP with \fICURL_SOCKET_TIMEOUT\fP
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148
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149 8. Go back to step 6.
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150 .SH AVAILABILITY
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151 This function was added in libcurl 7.15.4, and is deemed stable since
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152 7.16.0.
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153
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154 \fIcurl_multi_socket(3)\fP is deprecated, use
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155 \fIcurl_multi_socket_action(3)\fP instead!
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156 .SH "SEE ALSO"
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157 .BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
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158 .BR curl_multi_fdset "(3), " curl_multi_info_read "(3), "
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159 .BR "the hiperfifo.c example"