int manager_get_user_by_pid(Manager *m, pid_t pid, User **user);
int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session);
int manager_get_user_by_pid(Manager *m, pid_t pid, User **user);
int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session);