SSL_set_session - set a TLS/SSL session to be used during TLS/SSL connect

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       Licensed  under  the  Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain  a  copy  in  the  file  LICENSE  in  the  source  distribution  or  at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                              SSL_SET_SESSION(3SSL)

SSL_set_session() sets session to be used when the TLS/SSL connection is to be established.
       SSL_set_session() is only useful for TLS/SSL clients.  When the session is set, the reference count of
       session is incremented by 1. If the session is not reused, the reference count is decremented again
       during SSL_connect(). Whether the session was reused can be queried with the SSL_session_reused(3) call.

       If there is already a session set inside ssl (because it was set with SSL_set_session() before or because
       the same ssl was already used for a connection), SSL_SESSION_free() will be called for that session.
       This is also the case when session is a NULL pointer. If that old session is still open, it is considered
       bad and will be removed from the session cache (if used). A session is considered open, if
       SSL_shutdown(3) was not called for the connection (or at least SSL_set_shutdown(3) was used to set the
       SSL_SENT_SHUTDOWN state).

       SSL_set_session - set a TLS/SSL session to be used during TLS/SSL connect

       SSL_SESSION objects keep internal link information about the session cache list, when being inserted into
       one SSL_CTX object's session cache.  One SSL_SESSION object, regardless of its reference count, must
       therefore only be used with one SSL_CTX object (and the SSL objects created from this SSL_CTX object).

       The following return values can occur:

       0   The operation failed; check the error stack to find out the reason.

       1   The operation succeeded.

ssl(7), SSL_SESSION_free(3), SSL_get_session(3), SSL_session_reused(3), SSL_CTX_set_session_cache_mode(3)

        #include <openssl/ssl.h>

        int SSL_set_session(SSL *ssl, SSL_SESSION *session);