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+.\" **************************************************************************
+.\" * _ _ ____ _
+.\" * Project ___| | | | _ \| |
+.\" * / __| | | | |_) | |
+.\" * | (__| |_| | _ <| |___
+.\" * \___|\___/|_| \_\_____|
+.\" *
+.\" * 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.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.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) "