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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
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.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.haxx.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
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.\" **************************************************************************
.TH curl_global_sslset 3 "15 July 2017" "libcurl 7.56" "libcurl Manual"
.SH NAME
curl_global_sslset - Select SSL backend to use with libcurl
.SH SYNOPSIS
.B #include <curl/curl.h>
.sp
.BI "CURLsslset curl_global_sslset(curl_sslbackend " id ", const char *" name
.BI ", curl_ssl_backend ***" avail ");"
.ad
.SH DESCRIPTION
This function configures at runtime which SSL backend to use with libcurl. This
function can only be called once, and it must be called \fBbefore\fP
curl_global_init().
The backend can be identified by the id (e.g. CURLSSLBACKEND_OPENSSL). The
backend can also be specified via the name parameter (passing -1 as id).
If both id and name are specified, the name will be ignored. If neither id
nor name are specified, the function will fail with
CURLSSLSET_UNKNOWN_BACKEND and set the "avail" pointer to the
NULL-terminated list of available backends.
Upon success, the function returns CURLSSLSET_OK.
If the specified SSL backend is not available, the function returns
CURLSSLSET_UNKNOWN_BACKEND and sets the "avail" pointer to a NULL-terminated
list of available SSL backends.
The SSL backend can be set only once. If it has already been set, a
subsequent attempt to change it will result in a CURLSSLSET_TOO_LATE.
\fBThis function is not thread safe.\fP You must not call it when any other
thread in the program (i.e. a thread sharing the same memory) is running.
This doesn't just mean no other thread that is using libcurl.
.SH AVAILABILITY
This function was added in libcurl 7.56.0. Before this version, there was no
support for choosing SSL backends at runtime.
.SH RETURN VALUE
If this function returns CURLSSLSET_OK, the backend was successfully selected.
If the chosen backend is unknown (or support for the chosed backend has not
been compiled into libcurl), the function returns CURLSSLSET_UNKNOWN_BACKEND.
If the backend had been configured previously, or if curl_global_init() has
already been called, the function returns CURLSSLSET_TOO_LATE.
.SH "SEE ALSO"
.BR curl_global_init "(3), "
.BR libcurl "(3) "
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