[exim] How to get Subject in transport?

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Author: Алексей Киреев
Date:  
To: exim-users
Subject: [exim] How to get Subject in transport?
Hello.

How can i get Subject header in transport appendfile.c?

log_write(0, LOG_MAIN, "DEBUG: transport delivered to dir=%s from=%s, subject=%s, size=%d", path, sender_address, subject, message_size);

Variable "subject" does not exists, other variables are present.