Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_global_init.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 - 2017, 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_global_init 3 "11 May 2004" "libcurl 7.12" "libcurl Manual"
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23 .SH NAME
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24 curl_global_init - Global libcurl initialisation
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25 .SH SYNOPSIS
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26 .B #include <curl/curl.h>
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27 .sp
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28 .BI "CURLcode curl_global_init(long " flags ");"
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29 .ad
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30 .SH DESCRIPTION
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31 This function sets up the program environment that libcurl needs. Think of it
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32 as an extension of the library loader.
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33
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34 This function must be called at least once within a program (a program is all
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35 the code that shares a memory space) before the program calls any other
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36 function in libcurl. The environment it sets up is constant for the life of
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37 the program and is the same for every program, so multiple calls have the same
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38 effect as one call.
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39
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40 The flags option is a bit pattern that tells libcurl exactly what features to
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41 init, as described below. Set the desired bits by ORing the values together.
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42 In normal operation, you must specify CURL_GLOBAL_ALL. Don't use any other
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43 value unless you are familiar with it and mean to control internal operations of
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44 libcurl.
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45
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46 \fBThis function is not thread safe.\fP You must not call it when any other
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47 thread in the program (i.e. a thread sharing the same memory) is running.
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48 This doesn't just mean no other thread that is using libcurl. Because
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49 \fIcurl_global_init(3)\fP calls functions of other libraries that are
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50 similarly thread unsafe, it could conflict with any other thread that uses
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51 these other libraries.
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52
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53 If you are initializing libcurl from a Windows DLL you should not initialize it
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54 from DllMain or a static initializer because Windows holds the loader lock
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55 during that time and it could cause a deadlock.
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56
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57 See the description in \fIlibcurl(3)\fP of global environment requirements for
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58 details of how to use this function.
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59 .SH FLAGS
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60 .IP CURL_GLOBAL_ALL
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61 Initialize everything possible. This sets all known bits except
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62 \fBCURL_GLOBAL_ACK_EINTR\fP.
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63
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64 .IP CURL_GLOBAL_SSL
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65 (This flag's presence or absence serves no meaning since 7.57.0. The
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66 description below is for older libcurl versions.)
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67
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68 Initialize SSL.
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69
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70 The implication here is that if this bit is not set, the initialization of the
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71 SSL layer needs to be done by the application or at least outside of
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72 libcurl. The exact procedure how to do SSL initialization depends on the TLS
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73 backend libcurl uses.
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74
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75 Doing TLS based transfers without having the TLS layer initialized may lead to
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76 unexpected behaviors.
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77 .IP CURL_GLOBAL_WIN32
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78 Initialize the Win32 socket libraries.
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79
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80 The implication here is that if this bit is not set, the initialization of
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81 winsock has to be done by the application or you risk getting undefined
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82 behaviors. This option exists for when the initialization is handled outside
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83 of libcurl so there's no need for libcurl to do it again.
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84 .IP CURL_GLOBAL_NOTHING
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85 Initialise nothing extra. This sets no bit.
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86 .IP CURL_GLOBAL_DEFAULT
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87 A sensible default. It will init both SSL and Win32. Right now, this equals
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88 the functionality of the \fBCURL_GLOBAL_ALL\fP mask.
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89 .IP CURL_GLOBAL_ACK_EINTR
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90 When this flag is set, curl will acknowledge EINTR condition when connecting
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91 or when waiting for data. Otherwise, curl waits until full timeout
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92 elapses. (Added in 7.30.0)
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93 .SH RETURN VALUE
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94 If this function returns non-zero, something went wrong and you cannot use the
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95 other curl functions.
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96 .SH "SEE ALSO"
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97 .BR curl_global_init_mem "(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
98 .BR curl_global_cleanup "(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
99 .BR curl_global_sslset "(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
100 .BR curl_easy_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
101 .BR libcurl "(3) "