cygwin_internal

extern "C" DWORD cygwin_internal(t,  
 ...); 
cygwin_getinfo_types t;
...;
 

This function gives you access to various internal data and functions. It takes two arguments. The first argument is a type from the 'cygwin_getinfo_types' enum. The second is an optional pointer.

Stay away unless you know what you're doing.