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>.