1=pod 2 3=head1 NAME 4 5SSL_get_fd, SSL_get_rfd, SSL_get_wfd - get file descriptor linked to an SSL object 6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 int SSL_get_fd(const SSL *ssl); 12 int SSL_get_rfd(const SSL *ssl); 13 int SSL_get_wfd(const SSL *ssl); 14 15=head1 DESCRIPTION 16 17SSL_get_fd() returns the file descriptor which is linked to B<ssl>. 18SSL_get_rfd() and SSL_get_wfd() return the file descriptors for the 19read or the write channel, which can be different. If the read and the 20write channel are different, SSL_get_fd() will return the file descriptor 21of the read channel. 22 23=head1 RETURN VALUES 24 25The following return values can occur: 26 27=over 4 28 29=item -1 30 31The operation failed, because the underlying BIO is not of the correct type 32(suitable for file descriptors). 33 34=item E<gt>=0 35 36The file descriptor linked to B<ssl>. 37 38=back 39 40=head1 SEE ALSO 41 42L<SSL_set_fd(3)>, L<ssl(7)> , L<bio(7)> 43 44=head1 COPYRIGHT 45 46Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 47 48Licensed under the Apache License 2.0 (the "License"). You may not use 49this file except in compliance with the License. You can obtain a copy 50in the file LICENSE in the source distribution or at 51L<https://www.openssl.org/source/license.html>. 52 53=cut 54