是否可能在Linux中将数据写入自己的stdin中

I want to debug my cgi script (C++) from IDE, so I would like to create a "debug mode": read file from disk, push it to own stdin, set some environment variables, that correspond this file and run the rest of the script as it was called by the web server. Is it possible and if it is, then how can I do that? I want to debug my cgi script (C++) from IDE, s