This is a patch for extending static analysis support for posix file descriptor APIs which is a part of my GSoC project. I've written a few testcases, which are all passing. There are a few TODOs like adding the copyright header and adding docs to gcc/doc/invoke.texi.
I'm looking for suggestions for whether the names of warnings I have chosen are appropriate, and configuring my vsocde editor to follow the GNU coding conventions. - Immad
