SSL_set_fd -- connect the SSL object with a file descriptor
Synopsis
#include <openssl/ssl.h>
int SSL_set_fd(SSL *ssl, int fd);
int SSL_set_rfd(SSL *ssl, int fd);
int SSL_set_wfd(SSL *ssl, int fd);
DESCRIPTION
SSL_set_fd() sets the file descriptor fd as the input/output facility for the
TLS/SSL (encrypted) side of ssl.
fd will typically be the socket file
descriptor of a network connection.
When performing the operation, a socket
BIO is automatically created to interface between the
ssl and fd. The BIO and hence the SSL engine inherit
the behaviour of fd. If fd is non-blocking, the ssl will also have non-blocking behaviour.
If there was already a BIO connected to ssl, BIO_free() will be called (for both the
reading and writing side, if different).
SSL_set_rfd() and SSL_set_wfd() perform the respective action, but
only for the read channel or the write channel, which can be set
independently.
RETURN VALUES
The following return values can occur:
0
The operation failed. Check the error stack to find out why.