What API of Linux/Windows corresponds to limiting network (download/upload) speed?

Question

I\'m talking about speed limiting in download managers. For example, in Internet Download Manager there is a an option :

Answer 1

I actually need this for a project I'm doing on Linux. I noticed that transmission had the ability to limit download speeds. Peeking through their source code, you can find curl all over it.

With that said, libcurl seems to be a good api for C\C++ programs. The api doesn't look that bad and neither does the documentation.

see CURLOPT_MAX_SEND_SPEED_LARGE and CURLOPT_MAX_RECV_SPEED_LARGE in:

man curl_easy_setopt(3)

and the libcurl homepage