Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_multi_socket_action.3 @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +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 .TH curl_multi_socket_action 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_action \- reads/writes available data given an action
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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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29 CURLMcode curl_multi_socket_action(CURLM * multi_handle,
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30 curl_socket_t sockfd,
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31 int ev_bitmask,
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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 When the application has detected action on a socket handled by libcurl, it
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36 should call \fIcurl_multi_socket_action(3)\fP with the \fBsockfd\fP argument
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37 set to the socket with the action. When the events on a socket are known, they
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38 can be passed as an events bitmask \fBev_bitmask\fP by first setting
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39 \fBev_bitmask\fP to 0, and then adding using bitwise OR (|) any combination of
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40 events to be chosen from CURL_CSELECT_IN, CURL_CSELECT_OUT or
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41 CURL_CSELECT_ERR. When the events on a socket are unknown, pass 0 instead, and
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42 libcurl will test the descriptor internally. It is also permissible to pass
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43 CURL_SOCKET_TIMEOUT to the \fBsockfd\fP parameter in order to initiate the
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44 whole process or when a timeout occurs.
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45
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46 At return, \fBrunning_handles\fP points to the number of running easy handles
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47 within the multi handle. When this number reaches zero, all transfers are
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48 complete/done. When you call \fIcurl_multi_socket_action(3)\fP on a specific
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49 socket and the counter decreases by one, it DOES NOT necessarily mean that
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50 this exact socket/transfer is the one that completed. Use
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51 \fIcurl_multi_info_read(3)\fP to figure out which easy handle that completed.
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53 The \fIcurl_multi_socket_action(3)\fP function informs the application about
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54 updates in the socket (file descriptor) status by doing none, one, or multiple
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55 calls to the socket callback function set with the
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56 \fICURLMOPT_SOCKETFUNCTION(3)\fP option to \fIcurl_multi_setopt(3)\fP. They
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57 update the status with changes since the previous time the callback was
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58 called.
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59
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60 Get the timeout time by setting the \fICURLMOPT_TIMERFUNCTION(3)\fP option
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61 with \fIcurl_multi_setopt(3)\fP. Your application will then get called with
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62 information on how long to wait for socket actions at most before doing the
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63 timeout action: call the \fIcurl_multi_socket_action(3)\fP function with the
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64 \fBsockfd\fP argument set to CURL_SOCKET_TIMEOUT. You can also use the
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65 \fIcurl_multi_timeout(3)\fP function to poll the value at any given time, but
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66 for an event-based system using the callback is far better than relying on
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67 polling the timeout value.
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68 .SH "TYPICAL USAGE"
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69 1. Create a multi handle
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71 2. Set the socket callback with \fICURLMOPT_SOCKETFUNCTION(3)\fP
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73 3. Set the timeout callback with \fICURLMOPT_TIMERFUNCTION(3)\fP, to get to
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74 know what timeout value to use when waiting for socket activities.
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75
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76 4. Add easy handles with curl_multi_add_handle()
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78 5. Provide some means to manage the sockets libcurl is using, so you can check
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79 them for activity. This can be done through your application code, or by way
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80 of an external library such as libevent or glib.
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81
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82 6. Call curl_multi_socket_action(..., CURL_SOCKET_TIMEOUT, 0, ...)
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83 to kickstart everything. To get one or more callbacks called.
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84
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85 7. Wait for activity on any of libcurl's sockets, use the timeout value your
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86 callback has been told.
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87
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88 8, When activity is detected, call curl_multi_socket_action() for the
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89 socket(s) that got action. If no activity is detected and the timeout expires,
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90 call \fIcurl_multi_socket_action(3)\fP with \fICURL_SOCKET_TIMEOUT\fP.
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91 .SH AVAILABILITY
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92 This function was added in libcurl 7.15.4, and is deemed stable since 7.16.0.
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93 .SH "SEE ALSO"
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94 .BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
95 .BR curl_multi_fdset "(3), " curl_multi_info_read "(3), "
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
96 .BR "the hiperfifo.c example"