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SSL_GET_FD(3) Library Functions Manual SSL_GET_FD(3)

SSL_get_fd, SSL_get_rfd, SSL_get_wfdget file descriptor linked to an SSL object

#include <openssl/ssl.h>

SSL_get_fd(const SSL *ssl);

SSL_get_rfd(const SSL *ssl);

SSL_get_wfd(const SSL *ssl);

() returns the file descriptor which is linked to ssl. () and () 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:

The operation failed, because the underlying BIO is not of the correct type (suitable for file descriptors).
The file descriptor linked to ssl.

BIO_new(3), ssl(3), SSL_set_fd(3)

SSL_get_fd() appeared in SSLeay 0.4 or earlier and has been available since OpenBSD 2.4.

SSL_get_rfd() and SSL_get_wfd() first appeared in OpenSSL 0.9.6c and have been available since OpenBSD 3.2.

March 27, 2018 OpenBSD-7.3