BIO_s_null(3ssl)

BIO_s_null3ssl

Null data sink

Usage

 #include <openssl/bio.h>
 const BIO_METHOD *BIO_s_null(void);

Overview

BIO_s_null() returns the null sink BIO method. Data written to the null sink is discarded, reads return EOF.

Notes

A null sink BIO behaves in a similar manner to the Unix /dev/null device.

A null bio can be placed on the end of a chain to discard any data passed through it.

A null sink is useful if, for example, an application wishes to digest some data by writing through a digest bio but not send the digested data anywhere. Since a BIO chain must normally include a source/sink BIO this can be achieved by adding a null sink BIO to the end of the chain

Return values

BIO_s_null() returns the null sink BIO method.

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.