Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_multi_perform.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 - 2015, 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_perform 3 "1 March 2002" "libcurl 7.9.5" "libcurl Manual"
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23 .SH NAME
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24 curl_multi_perform - reads/writes available data from each easy handle
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25 .SH SYNOPSIS
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26 #include <curl/curl.h>
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27
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28 CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles);
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29 .ad
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30 .SH DESCRIPTION
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31 This function handles transfers on all the added handles that need attention
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32 in an non-blocking fashion.
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33
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34 When an application has found out there's data available for the multi_handle
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35 or a timeout has elapsed, the application should call this function to
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36 read/write whatever there is to read or write right now etc.
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37 \fIcurl_multi_perform(3)\fP returns as soon as the reads/writes are done. This
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38 function does not require that there actually is any data available for
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39 reading or that data can be written, it can be called just in case. It will
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40 write the number of handles that still transfer data in the second argument's
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41 integer-pointer.
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42
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43 If the amount of \fIrunning_handles\fP is changed from the previous call (or
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44 is less than the amount of easy handles you've added to the multi handle), you
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45 know that there is one or more transfers less "running". You can then call
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46 \fIcurl_multi_info_read(3)\fP to get information about each individual
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47 completed transfer, and that returned info includes CURLcode and more. If an
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48 added handle fails very quickly, it may never be counted as a running_handle.
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49
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50 When \fIrunning_handles\fP is set to zero (0) on the return of this function,
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51 there is no longer any transfers in progress.
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52 .SH EXAMPLE
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53 .nf
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54 #ifdef _WIN32
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55 #define SHORT_SLEEP Sleep(100)
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56 #else
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57 #define SHORT_SLEEP usleep(100000)
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58 #endif
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59
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60 fd_set fdread;
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61 fd_set fdwrite;
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62 fd_set fdexcep;
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63 int maxfd = -1;
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64
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65 long curl_timeo;
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66
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67 curl_multi_timeout(multi_handle, &curl_timeo);
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68 if(curl_timeo < 0)
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69 curl_timeo = 1000;
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70
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71 timeout.tv_sec = curl_timeo / 1000;
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72 timeout.tv_usec = (curl_timeo % 1000) * 1000;
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73
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74 FD_ZERO(&fdread);
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75 FD_ZERO(&fdwrite);
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76 FD_ZERO(&fdexcep);
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77
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78 /* get file descriptors from the transfers */
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79 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
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80
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81 if(maxfd == -1) {
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82 SHORT_SLEEP;
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83 rc = 0;
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84 }
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85 else
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86 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
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87
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88 switch(rc) {
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89 case -1:
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90 /* select error */
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91 break;
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92 case 0:
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93 default:
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94 /* timeout or readable/writable sockets */
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95 curl_multi_perform(multi_handle, &still_running);
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96 break;
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97 }
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98
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99 /* if there are still transfers, loop! */
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100 .fi
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101 .SH "RETURN VALUE"
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102 CURLMcode type, general libcurl multi interface error code.
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103
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104 Before version 7.20.0: If you receive \fICURLM_CALL_MULTI_PERFORM\fP, this
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105 basically means that you should call \fIcurl_multi_perform(3)\fP again, before
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106 you select() on more actions. You don't have to do it immediately, but the
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107 return code means that libcurl may have more data available to return or that
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108 there may be more data to send off before it is "satisfied". Do note that
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109 \fIcurl_multi_perform(3)\fP will return \fICURLM_CALL_MULTI_PERFORM\fP only
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110 when it wants to be called again \fBimmediately\fP. When things are fine and
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111 there is nothing immediate it wants done, it'll return \fICURLM_OK\fP and you
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112 need to wait for \&"action" and then call this function again.
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113
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114 This function only returns errors etc regarding the whole multi stack.
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115 Problems still might have occurred on individual transfers even when this
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116 function returns \fICURLM_OK\fP. Use \fIcurl_multi_info_read(3)\fP to figure
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117 out how individual transfers did.
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118 .SH "TYPICAL USAGE"
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119 Most applications will use \fIcurl_multi_fdset(3)\fP to get the multi_handle's
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120 file descriptors, and \fIcurl_multi_timeout(3)\fP to get a suitable timeout
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121 period, then it'll wait for action on the file descriptors using
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122 \fBselect(3)\fP. As soon as one or more file descriptor is ready,
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123 \fIcurl_multi_perform(3)\fP gets called.
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124 .SH "SEE ALSO"
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125 .BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
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126 .BR curl_multi_wait "(3), "
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127 .BR curl_multi_fdset "(3), " curl_multi_info_read "(3), "
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128 .BR libcurl-errors "(3)"