- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO

# NAME

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:

1. The operation failed. Check the error stack to find out why.

2. The operation succeeded.

# SEE ALSO

SSL_get_fd, SSL_set_bio, SSL_connect, SSL_accept, SSL_shutdown, ssl , bio