SSL_get_fd(3ssl)

SSL_get_fd3ssl

Get file descriptor linked to an ssl object

Usage

 #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);

Overview

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.

Releases

13 releases since Debian 3.0 (Woody); the text changed 12 times.

  1. 3.0
  2. 3.1
  3. 4.0
  4. 5.0
  5. 6.0
  6. 7
  7. 8
  8. 9
  9. 10
  10. 11
  11. 12
  12. 13
  13. Arch

From openssl 3.6.5-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.