=pod =head1 NAME SSL_get_fd - get file descriptor linked to an SSL object =head1 SYNOPSIS #include int SSL_get_fd(const SSL *ssl); int SSL_get_rfd(const SSL *ssl); int SSL_get_wfd(const SSL *ssl); =head1 DESCRIPTION SSL_get_fd() returns the file descriptor which is linked to B. 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. =head1 RETURN VALUES The following return values can occur: =over 4 =item -1 The operation failed, because the underlying BIO is not of the correct type (suitable for file descriptors). =item E=0 The file descriptor linked to B. =back =head1 SEE ALSO L, L , L =cut