-uint64_t get_cpu_id(struct bt_ctf_event *event);
-uint64_t get_context_tid(struct bt_ctf_event *event);
-uint64_t get_context_pid(struct bt_ctf_event *event);
-uint64_t get_context_ppid(struct bt_ctf_event *event);
-char *get_context_comm(struct bt_ctf_event *event);
+uint64_t get_cpu_id(const struct bt_ctf_event *event);
+uint64_t get_context_tid(const struct bt_ctf_event *event);
+uint64_t get_context_pid(const struct bt_ctf_event *event);
+uint64_t get_context_ppid(const struct bt_ctf_event *event);
+char *get_context_comm(const struct bt_ctf_event *event);