Gets the context variable for a cpg instance
#include <corosync/cpg.h>
int cpg_context_get(cpg_handle_t handle, void **context);
The cpg_context_get function is used to retrieve the context variable previously stored using cpg_context_set(3)
This call returns the CPG_OK value if successful, otherwise an error is returned.
The errors are undocumented.