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105 lines
4.5 KiB
105 lines
4.5 KiB
4 months ago
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.TH curl_global_init 3 "January 23, 2020" "libcurl 7.73.0" "libcurl Manual"
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.SH NAME
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curl_global_init - Global libcurl initialisation
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.SH SYNOPSIS
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.B #include <curl/curl.h>
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.sp
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.BI "CURLcode curl_global_init(long " flags ");"
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.ad
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.SH DESCRIPTION
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This function sets up the program environment that libcurl needs. Think of it
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as an extension of the library loader.
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This function must be called at least once within a program (a program is all
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the code that shares a memory space) before the program calls any other
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function in libcurl. The environment it sets up is constant for the life of
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the program and is the same for every program, so multiple calls have the same
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effect as one call.
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The flags option is a bit pattern that tells libcurl exactly what features to
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init, as described below. Set the desired bits by ORing the values together.
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In normal operation, you must specify CURL_GLOBAL_ALL. Don't use any other
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value unless you are familiar with it and mean to control internal operations of
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libcurl.
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\fBThis function is not thread safe.\fP You must not call it when any other
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thread in the program (i.e. a thread sharing the same memory) is running.
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This doesn't just mean no other thread that is using libcurl. Because
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\fIcurl_global_init(3)\fP calls functions of other libraries that are
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similarly thread unsafe, it could conflict with any other thread that uses
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these other libraries.
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If you are initializing libcurl from a Windows DLL you should not initialize it
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from DllMain or a static initializer because Windows holds the loader lock
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during that time and it could cause a deadlock.
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See the description in \fIlibcurl(3)\fP of global environment requirements for
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details of how to use this function.
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.SH FLAGS
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.IP CURL_GLOBAL_ALL
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Initialize everything possible. This sets all known bits except
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\fBCURL_GLOBAL_ACK_EINTR\fP.
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.IP CURL_GLOBAL_SSL
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(This flag's presence or absence serves no meaning since 7.57.0. The
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description below is for older libcurl versions.)
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Initialize SSL.
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The implication here is that if this bit is not set, the initialization of the
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SSL layer needs to be done by the application or at least outside of
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libcurl. The exact procedure how to do SSL initialization depends on the TLS
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backend libcurl uses.
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Doing TLS based transfers without having the TLS layer initialized may lead to
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unexpected behaviors.
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.IP CURL_GLOBAL_WIN32
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Initialize the Win32 socket libraries.
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The implication here is that if this bit is not set, the initialization of
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winsock has to be done by the application or you risk getting undefined
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behaviors. This option exists for when the initialization is handled outside
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of libcurl so there's no need for libcurl to do it again.
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.IP CURL_GLOBAL_NOTHING
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Initialise nothing extra. This sets no bit.
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.IP CURL_GLOBAL_DEFAULT
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A sensible default. It will init both SSL and Win32. Right now, this equals
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the functionality of the \fBCURL_GLOBAL_ALL\fP mask.
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.IP CURL_GLOBAL_ACK_EINTR
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This bit has no point since 7.69.0 but its behavior is instead the default.
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Before 7.69.0: when this flag is set, curl will acknowledge EINTR condition
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when connecting or when waiting for data. Otherwise, curl waits until full
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timeout elapses. (Added in 7.30.0)
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.SH RETURN VALUE
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If this function returns non-zero, something went wrong and you cannot use the
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other curl functions.
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.SH "SEE ALSO"
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.BR curl_global_init_mem "(3), "
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.BR curl_global_cleanup "(3), "
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.BR curl_global_sslset "(3), "
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.BR curl_easy_init "(3) "
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.BR libcurl "(3) "
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