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.\"
.IX Title "SSL_GET_FD 3ssl"
.TH SSL_GET_FD 3ssl 2024-10-23 3.4.0 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH NAME
SSL_get_fd, SSL_get_rfd, SSL_get_wfd \- get file descriptor linked to an SSL object
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBSSL_get_fd()\fR returns the file descriptor which is linked to \fBssl\fR.
\&\fBSSL_get_rfd()\fR and \fBSSL_get_wfd()\fR return the file descriptors for the
read or the write channel, which can be different. If the read and the
write channel are different, \fBSSL_get_fd()\fR will return the file descriptor
of the read channel.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP \-1 4
.IX Item "-1"
The operation failed, because the underlying BIO is not of the correct type
(suitable for file descriptors).
.IP >=0 4
.IX Item ">=0"
The file descriptor linked to \fBssl\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_set_fd\fR\|(3), \fBssl\fR\|(7) , \fBbio\fR\|(7)
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.