Describe the bug
Typo in osapi.h causes compilation failure when included into a c++ file

To Reproduce
Include osapi.h into a c++ file

Expected behavior
Successful compilation

Code snips

The following line is missing its corresponding extern "C" { and fails to build under C++:

Appears to be introduced in f0bd42e

System observed on:
Linux

Reporter Info
John N Pham, Northrop Grumman