Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_multi_poll.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 - 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_poll 3 "29 Jul 2019" "libcurl 7.66.0" "libcurl Manual"
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23 .SH NAME
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24 curl_multi_poll - polls on all easy handles in a multi handle
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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
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29 CURLMcode curl_multi_poll(CURLM *multi_handle,
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30 struct curl_waitfd extra_fds[],
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31 unsigned int extra_nfds,
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32 int timeout_ms,
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33 int *numfds);
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34 .ad
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35 .SH DESCRIPTION
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36 \fIcurl_multi_poll(3)\fP polls all file descriptors used by the curl easy
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37 handles contained in the given multi handle set. It will block until activity
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38 is detected on at least one of the handles or \fItimeout_ms\fP has passed.
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39 Alternatively, if the multi handle has a pending internal timeout that has a
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40 shorter expiry time than \fItimeout_ms\fP, that shorter time will be used
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41 instead to make sure timeout accuracy is reasonably kept.
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42
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43 The calling application may pass additional curl_waitfd structures which are
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44 similar to \fIpoll(2)\fP's pollfd structure to be waited on in the same call.
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45
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46 On completion, if \fInumfds\fP is non-NULL, it will be populated with the
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47 total number of file descriptors on which interesting events occurred. This
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48 number can include both libcurl internal descriptors as well as descriptors
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49 provided in \fIextra_fds\fP.
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50
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51 If no extra file descriptors are provided and libcurl has no file descriptor
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52 to offer to wait for, this function will instead wait during \fItimeout_ms\fP
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53 milliseconds (or shorter if an internal timer indicates so). This is the
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54 detail that makes this function different than \fIcurl_multi_wait(3)\fP.
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55
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56 This function is encouraged to be used instead of select(3) when using the
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57 multi interface to allow applications to easier circumvent the common problem
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58 with 1024 maximum file descriptors.
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59 .SH curl_waitfd
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60 .nf
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61 struct curl_waitfd {
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62 curl_socket_t fd;
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63 short events;
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64 short revents;
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65 };
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66 .fi
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67 .IP CURL_WAIT_POLLIN
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68 Bit flag to curl_waitfd.events indicating the socket should poll on read
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69 events such as new data received.
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70 .IP CURL_WAIT_POLLPRI
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71 Bit flag to curl_waitfd.events indicating the socket should poll on high
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72 priority read events such as out of band data.
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73 .IP CURL_WAIT_POLLOUT
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74 Bit flag to curl_waitfd.events indicating the socket should poll on write
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75 events such as the socket being clear to write without blocking.
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76 .SH EXAMPLE
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77 .nf
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78 CURL *easy_handle;
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79 CURLM *multi_handle;
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80
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81 /* add the individual easy handle */
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82 curl_multi_add_handle(multi_handle, easy_handle);
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83
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84 do {
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85 CURLMcode mc;
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86 int numfds;
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87
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88 mc = curl_multi_perform(multi_handle, &still_running);
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89
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90 if(mc == CURLM_OK) {
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91 /* wait for activity or timeout */
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92 mc = curl_multi_poll(multi_handle, NULL, 0, 1000, &numfds);
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93 }
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94
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95 if(mc != CURLM_OK) {
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96 fprintf(stderr, "curl_multi failed, code %d.\\n", mc);
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97 break;
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98 }
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99
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100 } while(still_running);
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101
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102 curl_multi_remove_handle(multi_handle, easy_handle);
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103 .fi
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104 .SH RETURN VALUE
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105 CURLMcode type, general libcurl multi interface error code. See
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106 \fIlibcurl-errors(3)\fP
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107 .SH AVAILABILITY
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108 This function was added in libcurl 7.66.0.
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109 .SH "SEE ALSO"
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110 .BR curl_multi_fdset "(3), " curl_multi_perform "(3), " curl_multi_wait "(3)"