SSL_SET_FD(3)              Library Functions Manual              SSL_SET_FD(3)

NAME
     SSL_set_fd, SSL_set_rfd, SSL_set_wfd - 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(3) 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.

     1       The operation succeeded.

SEE ALSO
     BIO_new(3), ssl(3), SSL_accept(3), SSL_connect(3), SSL_get_fd(3),
     SSL_set_bio(3), SSL_shutdown(3)

HISTORY
     SSL_set_fd() appeared in SSLeay 0.4 or earlier.  SSL_set_rfd() and
     SSL_set_wfd() first appeared in SSLeay 0.6.0.  These functions have been
     available since OpenBSD 2.4.

Linux 6.8.7-arch1-1             March 27, 2018             Linux 6.8.7-arch1-1