+/*
+ * Counter API.
+ */
+
+enum ustctl_counter_bitness {
+ USTCTL_COUNTER_BITNESS_32 = 0,
+ USTCTL_COUNTER_BITNESS_64 = 1,
+};
+
+enum ustctl_counter_arithmetic {
+ USTCTL_COUNTER_ARITHMETIC_MODULAR = 0,
+ USTCTL_COUNTER_ARITHMETIC_SATURATION = 1,
+};
+
+/* Used as alloc flags. */
+enum ustctl_counter_alloc {
+ USTCTL_COUNTER_ALLOC_PER_CPU = (1 << 0),
+ USTCTL_COUNTER_ALLOC_GLOBAL = (1 << 1),
+};
+
+struct ustctl_daemon_counter;
+
+int ustctl_get_nr_cpu_per_counter(void);
+
+struct ustctl_counter_dimension {
+ uint64_t size;
+ uint64_t underflow_index;
+ uint64_t overflow_index;
+ uint8_t has_underflow;
+ uint8_t has_overflow;
+};
+
+struct ustctl_daemon_counter *
+ ustctl_create_counter(size_t nr_dimensions,
+ const struct ustctl_counter_dimension *dimensions,
+ int64_t global_sum_step,
+ int global_counter_fd,
+ int nr_counter_cpu_fds,
+ const int *counter_cpu_fds,
+ enum ustctl_counter_bitness bitness,
+ enum ustctl_counter_arithmetic arithmetic,
+ uint32_t alloc_flags,
+ bool coalesce_hits);
+
+int ustctl_create_counter_data(struct ustctl_daemon_counter *counter,
+ struct lttng_ust_abi_object_data **counter_data);
+
+int ustctl_create_counter_global_data(struct ustctl_daemon_counter *counter,
+ struct lttng_ust_abi_object_data **counter_global_data);
+int ustctl_create_counter_cpu_data(struct ustctl_daemon_counter *counter, int cpu,
+ struct lttng_ust_abi_object_data **counter_cpu_data);
+
+/*
+ * Each counter data and counter cpu data created need to be destroyed
+ * before calling ustctl_destroy_counter().
+ */
+void ustctl_destroy_counter(struct ustctl_daemon_counter *counter);
+
+int ustctl_send_counter_data_to_ust(int sock, int parent_handle,
+ struct lttng_ust_abi_object_data *counter_data);
+int ustctl_send_counter_global_data_to_ust(int sock,
+ struct lttng_ust_abi_object_data *counter_data,
+ struct lttng_ust_abi_object_data *counter_global_data);
+int ustctl_send_counter_cpu_data_to_ust(int sock,
+ struct lttng_ust_abi_object_data *counter_data,
+ struct lttng_ust_abi_object_data *counter_cpu_data);
+
+int ustctl_counter_read(struct ustctl_daemon_counter *counter,
+ const size_t *dimension_indexes,
+ int cpu, int64_t *value,
+ bool *overflow, bool *underflow);
+int ustctl_counter_aggregate(struct ustctl_daemon_counter *counter,
+ const size_t *dimension_indexes,
+ int64_t *value,
+ bool *overflow, bool *underflow);
+int ustctl_counter_clear(struct ustctl_daemon_counter *counter,
+ const size_t *dimension_indexes);
+