SSL_SET_FD(3ssl) OpenSSL SSL_SET_FD(3ssl) SSL_set_fd SSL_set_rfd SSL_set_wfd - SSL #include int SSL_set_fd(SSL *ssl, int fd); int SSL_set_rfd(SSL *ssl, int fd); int SSL_set_wfd(SSL *ssl, int fd); SSL_set_fd() fd / TLS/SSL ssl. fd . socket BIO ssl fd. BIO SSL fd. fd ssl . QUIC SSL datagram BIO socket BIO. QUIC SSL. BIO ssl BIO_free() ( ). SSL_set_rfd() SSL_set_wfd() . : 0 . . 1 . 64 (UINT_PTR) ( 'SOCKET' 'int' ) SSL_set_*fd(). INVALID_SOCKET-1 (2^64 - 2) socket() 2^24. SSL_get_fd(3), SSL_set_bio(3), SSL_connect(3), SSL_accept(3), SSL_shutdown(3), ssl(7) , bio(7) 2000-2023 OpenSSL. . Apache 2.0 ( ""). . LICENSE . 3 . . : . 3.6.2 7 2026 SSL_SET_FD(3ssl)