+/* index */
+
+/*
+ * Getters which need to be used on the current packet (between get/put
+ * or get_next/put_next.
+ */
+
+int lttng_ust_ctl_get_timestamp_begin(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *timestamp_begin);
+int lttng_ust_ctl_get_timestamp_end(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *timestamp_end);
+int lttng_ust_ctl_get_events_discarded(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *events_discarded);
+int lttng_ust_ctl_get_content_size(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *content_size);
+int lttng_ust_ctl_get_packet_size(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *packet_size);
+int lttng_ust_ctl_get_sequence_number(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *seq);
+
+/*
+ * Getter returning state invariant for the stream, which can be used
+ * without "get" operation.
+ */
+
+int lttng_ust_ctl_get_stream_id(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *stream_id);
+int lttng_ust_ctl_get_instance_id(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *id);
+
+/*
+ * Getter returning the current timestamp as perceived from the
+ * tracer.
+ */
+int lttng_ust_ctl_get_current_timestamp(struct lttng_ust_ctl_consumer_stream *stream,
+ uint64_t *ts);
+
+/* returns whether UST has perf counters support. */
+int lttng_ust_ctl_has_perf_counters(void);
+
+/* Regenerate the statedump. */
+int lttng_ust_ctl_regenerate_statedump(int sock, int handle);
+
+/* event registry management */
+
+enum lttng_ust_ctl_socket_type {
+ LTTNG_UST_CTL_SOCKET_CMD = 0,
+ LTTNG_UST_CTL_SOCKET_NOTIFY = 1,
+};
+
+enum lttng_ust_ctl_notify_cmd {
+ LTTNG_UST_CTL_NOTIFY_CMD_EVENT = 0,
+ LTTNG_UST_CTL_NOTIFY_CMD_CHANNEL = 1,
+ LTTNG_UST_CTL_NOTIFY_CMD_ENUM = 2,
+};
+
+enum lttng_ust_ctl_channel_header {
+ LTTNG_UST_CTL_CHANNEL_HEADER_UNKNOWN = 0,
+ LTTNG_UST_CTL_CHANNEL_HEADER_COMPACT = 1,
+ LTTNG_UST_CTL_CHANNEL_HEADER_LARGE = 2,
+};
+
+/* event type structures */
+
+enum lttng_ust_ctl_abstract_types {
+ lttng_ust_ctl_atype_integer,
+ lttng_ust_ctl_atype_enum, /* legacy */
+ lttng_ust_ctl_atype_array, /* legacy */
+ lttng_ust_ctl_atype_sequence, /* legacy */
+ lttng_ust_ctl_atype_string,
+ lttng_ust_ctl_atype_float,
+ lttng_ust_ctl_atype_variant, /* legacy */
+ lttng_ust_ctl_atype_struct, /* legacy */
+ lttng_ust_ctl_atype_enum_nestable,
+ lttng_ust_ctl_atype_array_nestable,
+ lttng_ust_ctl_atype_sequence_nestable,
+ lttng_ust_ctl_atype_struct_nestable,
+ lttng_ust_ctl_atype_variant_nestable,
+ NR_LTTNG_UST_CTL_ABSTRACT_TYPES,
+};
+
+enum lttng_ust_ctl_string_encodings {
+ lttng_ust_ctl_encode_none = 0,
+ lttng_ust_ctl_encode_UTF8 = 1,
+ lttng_ust_ctl_encode_ASCII = 2,
+ NR_LTTNG_UST_CTL_STRING_ENCODINGS,
+};
+
+#define LTTNG_UST_CTL_UST_INTEGER_TYPE_PADDING 24
+struct lttng_ust_ctl_integer_type {
+ uint32_t size; /* in bits */
+ uint32_t signedness;
+ uint32_t reverse_byte_order;
+ uint32_t base; /* 2, 8, 10, 16, for pretty print */
+ int32_t encoding; /* enum lttng_ust_ctl_string_encodings */
+ uint16_t alignment; /* in bits */
+ char padding[LTTNG_UST_CTL_UST_INTEGER_TYPE_PADDING];
+} __attribute__((packed));
+
+#define LTTNG_UST_CTL_UST_FLOAT_TYPE_PADDING 24
+struct lttng_ust_ctl_float_type {
+ uint32_t exp_dig; /* exponent digits, in bits */
+ uint32_t mant_dig; /* mantissa digits, in bits */
+ uint32_t reverse_byte_order;
+ uint16_t alignment; /* in bits */
+ char padding[LTTNG_UST_CTL_UST_FLOAT_TYPE_PADDING];
+} __attribute__((packed));
+
+#define LTTNG_UST_CTL_UST_ENUM_VALUE_PADDING 15
+struct lttng_ust_ctl_enum_value {
+ uint64_t value;
+ uint8_t signedness;
+ char padding[LTTNG_UST_CTL_UST_ENUM_VALUE_PADDING];
+} __attribute__((packed));
+
+enum lttng_ust_ctl_ust_enum_entry_options {
+ LTTNG_UST_CTL_UST_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
+};
+
+#define LTTNG_UST_CTL_UST_ENUM_ENTRY_PADDING 32
+struct lttng_ust_ctl_enum_entry {
+ struct lttng_ust_ctl_enum_value start, end; /* start and end are inclusive */
+ char string[LTTNG_UST_ABI_SYM_NAME_LEN];
+ union {
+ struct {
+ uint32_t options;
+ } __attribute__((packed)) extra;
+ char padding[LTTNG_UST_CTL_UST_ENUM_ENTRY_PADDING];
+ } u;
+} __attribute__((packed));
+
+/* legacy */
+#define LTTNG_UST_CTL_UST_BASIC_TYPE_PADDING 296
+union _lttng_ust_ctl_basic_type {
+ struct lttng_ust_ctl_integer_type integer;
+ struct {
+ char name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ struct lttng_ust_ctl_integer_type container_type;
+ uint64_t id; /* enum ID in sessiond. */
+ } enumeration;
+ struct {
+ int32_t encoding; /* enum lttng_ust_ctl_string_encodings */
+ } string;
+ struct lttng_ust_ctl_float_type _float;
+ char padding[LTTNG_UST_CTL_UST_BASIC_TYPE_PADDING];
+} __attribute__((packed));
+
+/* legacy */
+struct lttng_ust_ctl_basic_type {
+ enum lttng_ust_ctl_abstract_types atype;
+ union {
+ union _lttng_ust_ctl_basic_type basic;
+ } u;
+} __attribute__((packed));
+
+/*
+ * Padding is derived from largest member: u.legacy.sequence which
+ * contains two basic types, each with LTTNG_UST_CTL_UST_BASIC_TYPE_PADDING.
+ */
+#define LTTNG_UST_CTL_UST_TYPE_PADDING (2 * LTTNG_UST_CTL_UST_BASIC_TYPE_PADDING)
+struct lttng_ust_ctl_type {
+ enum lttng_ust_ctl_abstract_types atype;
+ union {
+ struct lttng_ust_ctl_integer_type integer;
+ struct lttng_ust_ctl_float_type _float;
+ struct {
+ int32_t encoding; /* enum lttng_ust_ctl_string_encodings */
+ } string;
+ struct {
+ char name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ uint64_t id; /* enum ID in sessiond. */
+ /* container_type follows after this struct lttng_ust_ctl_field. */
+ } enum_nestable;
+ struct {
+ uint32_t length; /* num. elems. */
+ uint32_t alignment;
+ /* elem_type follows after this struct lttng_ust_ctl_field. */
+ } array_nestable;
+ struct {
+ char length_name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ uint32_t alignment; /* Alignment before elements. */
+ /* elem_type follows after the length_type. */
+ } sequence_nestable;
+ struct {
+ uint32_t nr_fields;
+ uint32_t alignment;
+ /* Followed by nr_fields struct lttng_ust_ctl_field. */
+ } struct_nestable;
+ struct {
+ uint32_t nr_choices;
+ char tag_name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ uint32_t alignment;
+ /* Followed by nr_choices struct lttng_ust_ctl_field. */
+ } variant_nestable;
+
+ /* Legacy ABI */
+ union {
+ union _lttng_ust_ctl_basic_type basic;
+ struct {
+ struct lttng_ust_ctl_basic_type elem_type;
+ uint32_t length; /* num. elems. */
+ } array;
+ struct {
+ struct lttng_ust_ctl_basic_type length_type;
+ struct lttng_ust_ctl_basic_type elem_type;
+ } sequence;
+ struct {
+ uint32_t nr_fields;
+ /* Followed by nr_fields struct lttng_ust_ctl_field. */
+ } _struct;
+ struct {
+ uint32_t nr_choices;
+ char tag_name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ /* Followed by nr_choices struct lttng_ust_ctl_field. */
+ } variant;
+ } legacy;
+ char padding[LTTNG_UST_CTL_UST_TYPE_PADDING];
+ } u;
+} __attribute__((packed));
+
+#define LTTNG_UST_CTL_UST_FIELD_PADDING 28
+struct lttng_ust_ctl_field {
+ char name[LTTNG_UST_ABI_SYM_NAME_LEN];
+ struct lttng_ust_ctl_type type;
+ char padding[LTTNG_UST_CTL_UST_FIELD_PADDING];
+} __attribute__((packed));
+
+/*
+ * Returns 0 on success, negative error value on error.
+ * If an error other than -LTTNG_UST_ERR_UNSUP_MAJOR is returned,
+ * the output fields are not populated.
+ */
+int lttng_ust_ctl_recv_reg_msg(int sock,
+ enum lttng_ust_ctl_socket_type *type,
+ uint32_t *major,
+ uint32_t *minor,
+ uint32_t *pid,
+ uint32_t *ppid,
+ uint32_t *uid,
+ uint32_t *gid,
+ uint32_t *bits_per_long,
+ uint32_t *uint8_t_alignment,
+ uint32_t *uint16_t_alignment,
+ uint32_t *uint32_t_alignment,
+ uint32_t *uint64_t_alignment,
+ uint32_t *long_alignment,
+ int *byte_order,
+ char *name); /* size LTTNG_UST_ABI_PROCNAME_LEN */
+
+/*
+ * Returns 0 on success, negative UST or system error value on error.
+ * Receive the notification command. The "notify_cmd" can then be used
+ * by the caller to find out which lttng_ust_ctl_recv_* function should be
+ * called to receive the notification, and which lttng_ust_ctl_reply_* is
+ * appropriate.
+ */
+int lttng_ust_ctl_recv_notify(int sock, enum lttng_ust_ctl_notify_cmd *notify_cmd);
+
+/*
+ * Returns 0 on success, negative UST or system error value on error.
+ */
+int lttng_ust_ctl_recv_register_event(int sock,
+ int *session_objd, /* session descriptor (output) */
+ int *channel_objd, /* channel descriptor (output) */
+ char *event_name, /*
+ * event name (output,
+ * size LTTNG_UST_ABI_SYM_NAME_LEN)
+ */
+ int *loglevel,
+ char **signature, /*
+ * event signature
+ * (output, dynamically
+ * allocated, must be free(3)'d
+ * by the caller if function
+ * returns success.)
+ */
+ size_t *nr_fields,
+ struct lttng_ust_ctl_field **fields,
+ char **model_emf_uri);
+
+/*
+ * Returns 0 on success, negative error value on error.
+ */
+int lttng_ust_ctl_reply_register_event(int sock,
+ uint32_t id, /* event id (input) */
+ int ret_code); /* return code. 0 ok, negative error */
+
+/*
+ * Returns 0 on success, negative UST or system error value on error.
+ */
+int lttng_ust_ctl_recv_register_enum(int sock,
+ int *session_objd,
+ char *enum_name,
+ struct lttng_ust_ctl_enum_entry **entries,
+ size_t *nr_entries);
+
+/*
+ * Returns 0 on success, negative error value on error.
+ */
+int lttng_ust_ctl_reply_register_enum(int sock,
+ uint64_t id, /* enum id (input) */
+ int ret_code);
+
+/*
+ * Returns 0 on success, negative UST or system error value on error.
+ */
+int lttng_ust_ctl_recv_register_channel(int sock,
+ int *session_objd, /* session descriptor (output) */
+ int *channel_objd, /* channel descriptor (output) */
+ size_t *nr_fields, /* context fields */
+ struct lttng_ust_ctl_field **fields);
+
+/*
+ * Returns 0 on success, negative error value on error.
+ */
+int lttng_ust_ctl_reply_register_channel(int sock,
+ uint32_t chan_id,
+ enum lttng_ust_ctl_channel_header header_type,
+ int ret_code); /* return code. 0 ok, negative error */
+
+/*
+ * Counter API.
+ */
+
+enum lttng_ust_ctl_counter_bitness {
+ LTTNG_UST_CTL_COUNTER_BITNESS_32 = 0,
+ LTTNG_UST_CTL_COUNTER_BITNESS_64 = 1,
+};
+
+enum lttng_ust_ctl_counter_arithmetic {
+ LTTNG_UST_CTL_COUNTER_ARITHMETIC_MODULAR = 0,
+ LTTNG_UST_CTL_COUNTER_ARITHMETIC_SATURATION = 1,
+};
+
+/* Used as alloc flags. */
+enum lttng_ust_ctl_counter_alloc {
+ LTTNG_UST_CTL_COUNTER_ALLOC_PER_CPU = (1 << 0),
+ LTTNG_UST_CTL_COUNTER_ALLOC_GLOBAL = (1 << 1),
+};
+
+struct lttng_ust_ctl_daemon_counter;
+
+int lttng_ust_ctl_get_nr_cpu_per_counter(void);
+
+struct lttng_ust_ctl_counter_dimension {
+ uint64_t size;
+ uint64_t underflow_index;
+ uint64_t overflow_index;
+ uint8_t has_underflow;
+ uint8_t has_overflow;
+};
+
+struct lttng_ust_ctl_daemon_counter *
+ lttng_ust_ctl_create_counter(size_t nr_dimensions,
+ const struct lttng_ust_ctl_counter_dimension *dimensions,
+ int64_t global_sum_step,
+ int global_counter_fd,
+ int nr_counter_cpu_fds,
+ const int *counter_cpu_fds,
+ enum lttng_ust_ctl_counter_bitness bitness,
+ enum lttng_ust_ctl_counter_arithmetic arithmetic,
+ uint32_t alloc_flags,
+ bool coalesce_hits);
+
+int lttng_ust_ctl_create_counter_data(struct lttng_ust_ctl_daemon_counter *counter,
+ struct lttng_ust_abi_object_data **counter_data);
+
+int lttng_ust_ctl_create_counter_global_data(struct lttng_ust_ctl_daemon_counter *counter,
+ struct lttng_ust_abi_object_data **counter_global_data);
+int lttng_ust_ctl_create_counter_cpu_data(struct lttng_ust_ctl_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 lttng_ust_ctl_destroy_counter().
+ */
+void lttng_ust_ctl_destroy_counter(struct lttng_ust_ctl_daemon_counter *counter);
+
+int lttng_ust_ctl_send_counter_data_to_ust(int sock, int parent_handle,
+ struct lttng_ust_abi_object_data *counter_data);
+int lttng_ust_ctl_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 lttng_ust_ctl_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 lttng_ust_ctl_counter_read(struct lttng_ust_ctl_daemon_counter *counter,
+ const size_t *dimension_indexes,
+ int cpu, int64_t *value,
+ bool *overflow, bool *underflow);
+int lttng_ust_ctl_counter_aggregate(struct lttng_ust_ctl_daemon_counter *counter,
+ const size_t *dimension_indexes,
+ int64_t *value,
+ bool *overflow, bool *underflow);
+int lttng_ust_ctl_counter_clear(struct lttng_ust_ctl_daemon_counter *counter,
+ const size_t *dimension_indexes);
+
+void lttng_ust_ctl_sigbus_handle(void *addr);
+
+#ifdef __cplusplus
+}
+#endif