Well, it seems you need to read up on what usenet is. If you google for usenet you should find a lot of information. Many ISP:s (Internet Service Providers) have a usenet server. You can configure most mail clients to allow you to read (and post on) usenet groups if your ISP has a news server. There are also programs that are exclusively for reading newsgroups. If your ISP doesn't have a news server, google provides a http-based access to it that's free. Before, google groups lagged behind several hours so it was inconvenient to use, but that's not the case today.
Head over to: http://groups.google.com/group/comp.lang.c
Keep in mind, though, that comp.lang.c only deals with the C language. Anything that's platform specific is off-topic for the group. But there are groups for developing on linux and other operating systems. If your question is pure C (like the one in this thread), ask in comp.lang.c, if it concerns libraries, api:s etc that's not part of the core language but provided by a specific operating system, ask in a group/forum dedicated to developing on that platform.