Updated: 2021/Apr/14


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

LIBRARY
       libcrypto, -lcrypto

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>.



1.1.1i                            2018-09-23                     SSL_get_fd(3)