provide cross-platform IPC

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on June 15, 2011 14:04:14_

the plans for sideline symbol access ( issue #446 ) will require some kind of IPC (either shared memory or named pipes most likely). we already have shared memory examples using raw syscalls on Windows in the stats sample client (coupled with DRgui). this issue covers exposing what we use for sideline symbols as a general API so clients can also perform sideline actions using more than just files and nudges as i/o.

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=498_

Start by reading the shared-memory examples in the stats sample client and how they interact with DRgui, then review issue #446 for the sideline symbol requirements. The goal is a general cross-platform IPC API that lets clients perform sideline actions using I/O beyond files and nudges.

Written by the indexing model from the issue text.