SSL_get_fd, SSL_get_rfd, SSL_get_wfd - get file descriptor linked to an SSL
int SSL_get_fd(const SSL *ssl);
int SSL_get_rfd(const SSL *ssl);
int SSL_get_wfd(const SSL *ssl);
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.
The following return values can occur:
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- The operation failed, because the underlying BIO is not of the correct
type (suitable for file descriptors).
- The file descriptor linked to ssl.
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