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