ERR_print_errors, ERR_print_errors_fp, ERR_print_errors_cb - print error messages

       Copyright 2000-2020 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                             ERR_PRINT_ERRORS(3SSL)

ERR_print_errors() is a convenience function that prints the error strings for all errors that OpenSSL
       has recorded to bp, thus emptying the error queue.

       ERR_print_errors_fp() is the same, except that the output goes to a FILE.

       ERR_print_errors_cb() is the same, except that the callback function, cb, is called for each error line
       with the string, length, and userdata u as the callback parameters.

       The error strings will have the following format:

        [pid]:error:[error code]:[library name]:[function name]:[reason string]:[filename]:[line]:[optional text message]

       errorcode is an 8 digit hexadecimal number. libraryname, functionname and reasonstring are ASCII
       text, as is optionaltextmessage if one was set for the respective error code.

       If there is no text string registered for the given error code, the error string will contain the numeric
       code.

       ERR_print_errors, ERR_print_errors_fp, ERR_print_errors_cb - print error messages

ERR_print_errors() and ERR_print_errors_fp() return no values.

ERR_error_string(3), ERR_get_error(3)

        #include <openssl/err.h>

        void ERR_print_errors(BIO *bp);
        void ERR_print_errors_fp(FILE *fp);
        void ERR_print_errors_cb(int (*cb)(const char *str, size_t len, void *u),
                                 void *u);