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.\" ========================================================================
.\"
.IX Title "SSL_set_fd 3"
.TH SSL_set_fd 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_set_fd \- connect the SSL object with a file descriptor
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_set_fd(SSL *ssl, int fd);
\& int SSL_set_rfd(SSL *ssl, int fd);
\& int SSL_set_wfd(SSL *ssl, int fd);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_set_fd()\fR sets the file descriptor \fBfd\fR as the input/output facility
for the \s-1TLS/SSL\s0 (encrypted) side of \fBssl\fR. \fBfd\fR will typically be the
socket file descriptor of a network connection.
.PP
When performing the operation, a \fBsocket \s-1BIO\s0\fR is automatically created to
interface between the \fBssl\fR and \fBfd\fR. The \s-1BIO\s0 and hence the \s-1SSL\s0 engine
inherit the behaviour of \fBfd\fR. If \fBfd\fR is non-blocking, the \fBssl\fR will
also have non-blocking behaviour.
.PP
If there was already a \s-1BIO\s0 connected to \fBssl\fR, \fBBIO_free()\fR will be called
(for both the reading and writing side, if different).
.PP
\&\fBSSL_set_rfd()\fR and \fBSSL_set_wfd()\fR perform the respective action, but only
for the read channel or the write channel, which can be set independently.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "0" 4
The operation failed. Check the error stack to find out why.
.IP "1" 4
.IX Item "1"
The operation succeeded.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_get_fd\fR\|(3), \fBSSL_set_bio\fR\|(3),
\&\fBSSL_connect\fR\|(3), \fBSSL_accept\fR\|(3),
\&\fBSSL_shutdown\fR\|(3), \fBssl\fR\|(3) , \fBbio\fR\|(3)
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