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SSL_GET_FD(3)                       OpenSSL                      SSL_GET_FD(3)
NAME
       SSL_get_fd, SSL_get_rfd, SSL_get_wfd - get file descriptor linked to an
       SSL object
SYNOPSIS
        #include <openssl/ssl.h>
        int SSL_get_fd(const SSL *ssl);
        int SSL_get_rfd(const SSL *ssl);
        int SSL_get_wfd(const SSL *ssl);
DESCRIPTION
       SSL_get_fd() returns the file descriptor which is linked to ssl.
       SSL_get_rfd() and SSL_get_wfd() return the file descriptors for the
       read or the write channel, which can be different. If the read and the
       write channel are different, SSL_get_fd() will return the file
       descriptor of the read channel.
RETURN VALUES
       The following return values can occur:
       -1  The operation failed, because the underlying BIO is not of the
           correct type (suitable for file descriptors).
       >=0 The file descriptor linked to ssl.
SEE ALSO
       SSL_set_fd(3), ssl(7) , bio(7)
COPYRIGHT
       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>;.
1.1.1k                            2021-03-25                     SSL_GET_FD(3)