SSL_SESSION_REUSED(3) | Library Functions Manual | SSL_SESSION_REUSED(3)

# NAME

`SSL_session_reused` — query whether a reused session was negotiated during handshake

# SYNOPSIS

library “libssl” libcrypto
`#include <openssl/ssl.h>`

int
`SSL_session_reused`(SSL *ssl);

# DESCRIPTION

Query whether a reused session was negotiated during the handshake.

During the negotiation, a client can propose to reuse a session. The server then looks up the session in its cache. If both client and server agree on the session, it will be reused and a flag is set that can be queried by the application.

# RETURN VALUES

The following return values can occur:

0
  A new session was negotiated.
1
  A session was reused.

# SEE ALSO

ssl(3), SSL_ctrl(3), SSL_CTX_set_session_cache_mode(3), SSL_set_session(3)

# HISTORY

`SSL_session_reused`() first appeared in SSLeay 0.8.0 and has been available since OpenBSD 2.4.

June 8, 2025 | Debian