SSL_CTX_has_client_custom_ext - check whether a handler exists for a particular client extension type

       Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

       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_CTX_HAS_CLIENT_CUSTOM_EXT(3SSL)

SSL_CTX_has_client_custom_ext() checks whether a handler has been set for a client extension of type
       ext_type using SSL_CTX_add_client_custom_ext().

       SSL_CTX_has_client_custom_ext - check whether a handler exists for a particular client extension type

       Returns 1 if a handler has been set, 0 otherwise.

ssl(7), SSL_CTX_add_client_custom_ext(3)

        #include <openssl/ssl.h>

        int SSL_CTX_has_client_custom_ext(const SSL_CTX *ctx, unsigned int ext_type);