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

# NAME

SSL_get_fd - get file descriptor linked to an SSL object

# SYNOPSIS

     #include <openssl/ssl.h>

     int SSL_get_fd(const SSL *ssl);
     int SSL_get_rfd(const SSL *ssl);
     int SSL_get_wfd(const SSL *ssl);

# DESCRIPTION

`SSL_get_fd()` returns the file descriptor which is linked to ssl. `SSL_get_rfd()` and `SSL_get_wfd()` 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.

# RETURN VALUES

The following return values can occur:

-1

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

>=0

  The file descriptor linked to ssl.

# SEE ALSO

SSL_set_fd, ssl , bio