struct lttng_ust_ring_buffer_ctx *ctx,
struct lttng_ust_channel_buffer *chan),
void (*get_value)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,
struct lttng_ust_ring_buffer_ctx *ctx,
struct lttng_ust_channel_buffer *chan),
void (*get_value)(void *priv, struct lttng_ust_probe_ctx *probe_ctx,