SSL_GET_FD(3SSL) OpenSSL SSL_GET_FD(3SSL)
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 Apache License 2.0 (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>.
3.5.7 2026-06-09 SSL_GET_FD(3SSL)
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