Open a handle to an existing context
#include <mm/renderer.h>
mmr_context_t* mmr_context_open(mmr_connection_t *connection, const char *name)
Open a handle to an existing context. The handle returned by this function is called a secondary handle.
To avoid memory leaks, every context handle needs to eventually be closed, either explicitly through an API call or implicitly by disconnecting from mm-renderer or terminating the process.
A handle on success, or a NULL pointer on failure (check errno)