SSL_get_fd - get file descriptor linked to an SSL object
SYNOPSIS
#include <openssl/ssl.h>
int SSL_get_fd(SSL *ssl);
int SSL_get_rfd(SSL *ssl);
int SSL_get_wfd(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(3) , bio(3)
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