#ifndef _LTTNG_UST_EVENTS_H
#define _LTTNG_UST_EVENTS_H
/*
* lttng/ust-events.h
*
* Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Holds LTTng per-session event registry.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <urcu/list.h>
#include <urcu/hlist.h>
#include <stdint.h>
#include <lttng/ust-config.h>
#include <lttng/ust-abi.h>
#include <lttng/ust-tracer.h>
#include <lttng/ust-endian.h>
#include <float.h>
#include <errno.h>
#include <urcu/ref.h>
#include <pthread.h>
#ifdef __cplusplus
extern "C" {
#endif
#define LTTNG_UST_UUID_LEN 16
/*
* Tracepoint provider version. Compatibility based on the major number.
* Older tracepoint providers can always register to newer lttng-ust
* library, but the opposite is rejected: a newer tracepoint provider is
* rejected by an older lttng-ust library.
*/
#define LTTNG_UST_PROVIDER_MAJOR 1
#define LTTNG_UST_PROVIDER_MINOR 0
struct lttng_channel;
struct lttng_session;
struct lttng_ust_lib_ring_buffer_ctx;
struct lttng_ust_context_app;
struct lttng_event_field;
/*
* Data structures used by tracepoint event declarations, and by the
* tracer. Those structures have padding for future extension.
*/
/*
* LTTng client type enumeration. Used by the consumer to map the
* callbacks from its own address space.
*/
enum lttng_client_types {
LTTNG_CLIENT_METADATA = 0,
LTTNG_CLIENT_DISCARD = 1,
LTTNG_CLIENT_OVERWRITE = 2,
LTTNG_CLIENT_DISCARD_RT = 3,
LTTNG_CLIENT_OVERWRITE_RT = 4,
LTTNG_NR_CLIENT_TYPES,
};
/* Type description */
/* Update the astract_types name table in lttng-types.c along with this enum */
enum lttng_abstract_types {
atype_integer,
atype_enum,
atype_array,
atype_sequence,
atype_string,
atype_float,
atype_dynamic,
atype_struct,
NR_ABSTRACT_TYPES,
};
/* Update the string_encodings name table in lttng-types.c along with this enum */
enum lttng_string_encodings {
lttng_encode_none = 0,
lttng_encode_UTF8 = 1,
lttng_encode_ASCII = 2,
NR_STRING_ENCODINGS,
};
struct lttng_enum_value {
unsigned long long value;
unsigned int signedness:1;
};
#define LTTNG_UST_ENUM_ENTRY_PADDING 16
struct lttng_enum_entry {
struct lttng_enum_value start, end; /* start and end are inclusive */
const char *string;
char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
};
#define __type_integer(_type, _byte_order, _base, _encoding) \
{ \
.atype = atype_integer, \
.u = \
{ \
.basic = \
{ \
.integer = \
{ \
.size = sizeof(_type) * CHAR_BIT, \
.alignment = lttng_alignof(_type) * CHAR_BIT, \
.signedness = lttng_is_signed_type(_type), \
.reverse_byte_order = _byte_order != BYTE_ORDER, \
.base = _base, \
.encoding = lttng_encode_##_encoding, \
} \
} \
}, \
} \
#define LTTNG_UST_INTEGER_TYPE_PADDING 24
struct lttng_integer_type {
unsigned int size; /* in bits */
unsigned short alignment; /* in bits */
unsigned int signedness:1;
unsigned int reverse_byte_order:1;
unsigned int base; /* 2, 8, 10, 16, for pretty print */
enum lttng_string_encodings encoding;
char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
};
/*
* Only float and double are supported. long double is not supported at
* the moment.
*/
#define _float_mant_dig(_type) \
(sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
: (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
: 0))
#define __type_float(_type) \
{ \
.atype = atype_float, \
.u = \
{ \
.basic = \
{ \
._float = \
{ \
.exp_dig = sizeof(_type) * CHAR_BIT \
- _float_mant_dig(_type), \
.mant_dig = _float_mant_dig(_type), \
.alignment = lttng_alignof(_type) * CHAR_BIT, \
.reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
} \
} \
}, \
} \
#define LTTNG_UST_FLOAT_TYPE_PADDING 24
struct lttng_float_type {
unsigned int exp_dig; /* exponent digits, in bits */
unsigned int mant_dig; /* mantissa digits, in bits */
unsigned short alignment; /* in bits */
unsigned int reverse_byte_order:1;
char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
};
#define LTTNG_UST_BASIC_TYPE_PADDING 128
union _lttng_basic_type {
struct lttng_integer_type integer;
struct {
const struct lttng_enum_desc *desc; /* Enumeration mapping */
struct lttng_integer_type container_type;
} enumeration;
struct {
enum lttng_string_encodings encoding;
} string;
struct lttng_float_type _float;
char padding[LTTNG_UST_BASIC_TYPE_PADDING];
};
struct lttng_basic_type {
enum lttng_abstract_types atype;
union {
union _lttng_basic_type basic;
} u;
};
#define LTTNG_UST_TYPE_PADDING 128
struct lttng_type {
enum lttng_abstract_types atype;
union {
union _lttng_basic_type basic;
struct {
struct lttng_basic_type elem_type;
unsigned int length; /* num. elems. */
} array;
struct {
struct lttng_basic_type length_type;
struct lttng_basic_type elem_type;
} sequence;
struct {
uint32_t nr_fields;
struct lttng_event_field *fields; /* Array of fields. */
} _struct;
char padding[LTTNG_UST_TYPE_PADDING];
} u;
};
#define LTTNG_UST_ENUM_TYPE_PADDING 24
struct lttng_enum_desc {
const char *name;
const struct lttng_enum_entry *entries;
unsigned int nr_entries;
char padding[LTTNG_UST_ENUM_TYPE_PADDING];
};
/*
* Event field description
*
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
*/
#define LTTNG_UST_EVENT_FIELD_PADDING 28
struct lttng_event_field {
const char *name;
struct lttng_type type;
unsigned int nowrite; /* do not write into trace */
char padding[LTTNG_UST_EVENT_FIELD_PADDING];
};
enum lttng_ust_dynamic_type {
LTTNG_UST_DYNAMIC_TYPE_NONE,
LTTNG_UST_DYNAMIC_TYPE_S8,
LTTNG_UST_DYNAMIC_TYPE_S16,
LTTNG_UST_DYNAMIC_TYPE_S32,
LTTNG_UST_DYNAMIC_TYPE_S64,
LTTNG_UST_DYNAMIC_TYPE_U8,
LTTNG_UST_DYNAMIC_TYPE_U16,
LTTNG_UST_DYNAMIC_TYPE_U32,
LTTNG_UST_DYNAMIC_TYPE_U64,
LTTNG_UST_DYNAMIC_TYPE_FLOAT,
LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
LTTNG_UST_DYNAMIC_TYPE_STRING,
_NR_LTTNG_UST_DYNAMIC_TYPES,
};
struct lttng_ctx_value {
enum lttng_ust_dynamic_type sel;
union {
int64_t s64;
const char *str;
double d;
} u;
};
struct lttng_perf_counter_field;
#define LTTNG_UST_CTX_FIELD_PADDING 40
struct lttng_ctx_field {
struct lttng_event_field event_field;
size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
void (*record)(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan);
void (*get_value)(struct lttng_ctx_field *field,
struct lttng_ctx_value *value);
union {
struct lttng_perf_counter_field *perf_counter;
char padding[LTTNG_UST_CTX_FIELD_PADDING];
} u;
void (*destroy)(struct lttng_ctx_field *field);
char *field_name; /* Has ownership, dynamically allocated. */
};
#define LTTNG_UST_CTX_PADDING 20
struct lttng_ctx {
struct lttng_ctx_field *fields;
unsigned int nr_fields;
unsigned int allocated_fields;
unsigned int largest_align;
char padding[LTTNG_UST_CTX_PADDING];
};
#define LTTNG_UST_EVENT_DESC_PADDING 40
struct lttng_event_desc {
const char *name;
void (*probe_callback)(void);
const struct lttng_event_ctx *ctx; /* context */
const struct lttng_event_field *fields; /* event payload */
unsigned int nr_fields;
const int **loglevel;
const char *signature; /* Argument types/names received */
union {
struct {
const char **model_emf_uri;
} ext;
char padding[LTTNG_UST_EVENT_DESC_PADDING];
} u;
};
#define LTTNG_UST_PROBE_DESC_PADDING 12
struct lttng_probe_desc {
const char *provider;
const struct lttng_event_desc **event_desc;
unsigned int nr_events;
struct cds_list_head head; /* chain registered probes */
struct cds_list_head lazy_init_head;
int lazy; /* lazy registration */
uint32_t major;
uint32_t minor;
char padding[LTTNG_UST_PROBE_DESC_PADDING];
};
/* Data structures used by the tracer. */
enum lttng_enabler_type {
LTTNG_ENABLER_WILDCARD,
LTTNG_ENABLER_EVENT,
};
/*
* Enabler field, within whatever object is enabling an event. Target of
* backward reference.
*/
struct lttng_enabler {
enum lttng_enabler_type type;
/* head list of struct lttng_ust_filter_bytecode_node */
struct cds_list_head filter_bytecode_head;
/* head list of struct lttng_ust_excluder_node */
struct cds_list_head excluder_head;
struct cds_list_head node; /* per-session list of enablers */
struct lttng_ust_event event_param;
struct lttng_channel *chan;
struct lttng_ctx *ctx;
unsigned int enabled:1;
};
struct tp_list_entry {
struct lttng_ust_tracepoint_iter tp;
struct cds_list_head head;
};
struct lttng_ust_tracepoint_list {
struct tp_list_entry *iter;
struct cds_list_head head;
};
struct tp_field_list_entry {
struct lttng_ust_field_iter field;
struct cds_list_head head;
};
struct lttng_ust_field_list {
struct tp_field_list_entry *iter;
struct cds_list_head head;
};
struct ust_pending_probe;
struct lttng_event;
struct lttng_ust_filter_bytecode_node {
struct cds_list_head node;
struct lttng_enabler *enabler;
/*
* struct lttng_ust_filter_bytecode has var. sized array, must
* be last field.
*/
struct lttng_ust_filter_bytecode bc;
};
struct lttng_ust_excluder_node {
struct cds_list_head node;
struct lttng_enabler *enabler;
/*
* struct lttng_ust_event_exclusion had variable sized array,
* must be last field.
*/
struct lttng_ust_event_exclusion excluder;
};
/*
* Filter return value masks.
*/
enum lttng_filter_ret {
LTTNG_FILTER_DISCARD = 0,
LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
/* Other bits are kept for future use. */
};
struct lttng_bytecode_runtime {
/* Associated bytecode */
struct lttng_ust_filter_bytecode_node *bc;
uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
int link_failed;
struct cds_list_head node; /* list of bytecode runtime in event */
struct lttng_session *session;
};
/*
* Objects in a linked-list of enablers, owned by an event.
*/
struct lttng_enabler_ref {
struct cds_list_head node; /* enabler ref list */
struct lttng_enabler *ref; /* backward ref */
};
/*
* lttng_event structure is referred to by the tracing fast path. It
* must be kept small.
*
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
*/
struct lttng_event {
/* LTTng-UST 2.0 starts here */
unsigned int id;
struct lttng_channel *chan;
int enabled;
const struct lttng_event_desc *desc;
void *_deprecated1;
struct lttng_ctx *ctx;
enum lttng_ust_instrumentation instrumentation;
struct cds_list_head node; /* Event list in session */
struct cds_list_head _deprecated2;
void *_deprecated3;
unsigned int _deprecated4:1;
/* LTTng-UST 2.1 starts here */
/* list of struct lttng_bytecode_runtime, sorted by seqnum */
struct cds_list_head bytecode_runtime_head;
int has_enablers_without_bytecode;
/* Backward references: list of lttng_enabler_ref (ref to enablers) */
struct cds_list_head enablers_ref_head;
struct cds_hlist_node hlist; /* session ht of events */
int registered; /* has reg'd tracepoint probe */
};
struct lttng_enum {
const struct lttng_enum_desc *desc;
struct lttng_session *session;
struct cds_list_head node; /* Enum list in session */
struct cds_hlist_node hlist; /* Session ht of enums */
uint64_t id; /* Enumeration ID in sessiond */
};
struct channel;
struct lttng_ust_shm_handle;
/*
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
*/
struct lttng_channel_ops {
struct lttng_channel *(*channel_create)(const char *name,
void *buf_addr,
size_t subbuf_size, size_t num_subbuf,
unsigned int switch_timer_interval,
unsigned int read_timer_interval,
unsigned char *uuid,
uint32_t chan_id,
const int *stream_fds, int nr_stream_fds);
void (*channel_destroy)(struct lttng_channel *chan);
union {
void *_deprecated1;
unsigned long has_strcpy:1; /* ABI has strcpy */
} u;
void *_deprecated2;
int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
uint32_t event_id);
void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
const void *src, size_t len);
/*
* packet_avail_size returns the available size in the current
* packet. Note that the size returned is only a hint, since it
* may change due to concurrent writes.
*/
size_t (*packet_avail_size)(struct channel *chan,
struct lttng_ust_shm_handle *handle);
//wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
//wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
int (*is_finalized)(struct channel *chan);
int (*is_disabled)(struct channel *chan);
int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
const char *src, size_t len);
};
/*
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
*/
struct lttng_channel {
/*
* The pointers located in this private data are NOT safe to be
* dereferenced by the consumer. The only operations the
* consumer process is designed to be allowed to do is to read
* and perform subbuffer flush.
*/
struct channel *chan; /* Channel buffers */
int enabled;
struct lttng_ctx *ctx;
/* Event ID management */
struct lttng_session *session;
int objd; /* Object associated to channel */
unsigned int _deprecated1;
unsigned int _deprecated2;
struct cds_list_head node; /* Channel list in session */
const struct lttng_channel_ops *ops;
int header_type; /* 0: unset, 1: compact, 2: large */
struct lttng_ust_shm_handle *handle; /* shared-memory handle */
unsigned int _deprecated3:1;
/* Channel ID */
unsigned int id;
enum lttng_ust_chan_type type;
unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
int tstate:1; /* Transient enable state */
};
#define LTTNG_UST_STACK_CTX_PADDING 32
struct lttng_stack_ctx {
struct lttng_event *event;
struct lttng_ctx *chan_ctx; /* RCU dereferenced. */
struct lttng_ctx *event_ctx; /* RCU dereferenced. */
char padding[LTTNG_UST_STACK_CTX_PADDING];
};
#define LTTNG_UST_EVENT_HT_BITS 12
#define LTTNG_UST_EVENT_HT_SIZE (1U << LTTNG_UST_EVENT_HT_BITS)
struct lttng_ust_event_ht {
struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
};
#define LTTNG_UST_ENUM_HT_BITS 12
#define LTTNG_UST_ENUM_HT_SIZE (1U << LTTNG_UST_ENUM_HT_BITS)
struct lttng_ust_enum_ht {
struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
};
/*
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
*/
struct lttng_session {
int active; /* Is trace session active ? */
int been_active; /* Been active ? */
int objd; /* Object associated */
void *_deprecated1;
struct cds_list_head chan_head; /* Channel list head */
struct cds_list_head events_head; /* list of events */
struct cds_list_head _deprecated2;
struct cds_list_head node; /* Session list */
int _deprecated3;
unsigned int _deprecated4:1;
/* New UST 2.1 */
/* List of enablers */
struct cds_list_head enablers_head;
struct lttng_ust_event_ht events_ht; /* ht of events */
void *owner; /* object owner */
int tstate:1; /* Transient enable state */
/* New UST 2.4 */
int statedump_pending:1;
/* New UST 2.8 */
struct lttng_ust_enum_ht enums_ht; /* ht of enumerations */
struct cds_list_head enums_head;
struct lttng_ctx *ctx; /* contexts for filters. */
};
struct lttng_transport {
char *name;
struct cds_list_head node;
struct lttng_channel_ops ops;
const struct lttng_ust_lib_ring_buffer_config *client_config;
};
struct lttng_session *lttng_session_create(void);
int lttng_session_enable(struct lttng_session *session);
int lttng_session_disable(struct lttng_session *session);
void lttng_session_destroy(struct lttng_session *session);
struct lttng_channel *lttng_channel_create(struct lttng_session *session,
const char *transport_name,
void *buf_addr,
size_t subbuf_size, size_t num_subbuf,
unsigned int switch_timer_interval,
unsigned int read_timer_interval,
int **shm_fd, int **wait_fd,
uint64_t **memory_map_size,
struct lttng_channel *chan_priv_init);
int lttng_channel_enable(struct lttng_channel *channel);
int lttng_channel_disable(struct lttng_channel *channel);
struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
struct lttng_ust_event *event_param,
struct lttng_channel *chan);
int lttng_enabler_enable(struct lttng_enabler *enabler);
int lttng_enabler_disable(struct lttng_enabler *enabler);
int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
struct lttng_ust_filter_bytecode_node *bytecode);
int lttng_enabler_attach_context(struct lttng_enabler *enabler,
struct lttng_ust_context *ctx);
int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
struct lttng_ust_excluder_node *excluder);
int lttng_attach_context(struct lttng_ust_context *context_param,
union ust_args *uargs,
struct lttng_ctx **ctx, struct lttng_session *session);
int lttng_session_context_init(struct lttng_ctx **ctx);
void lttng_transport_register(struct lttng_transport *transport);
void lttng_transport_unregister(struct lttng_transport *transport);
void synchronize_trace(void);
int lttng_probe_register(struct lttng_probe_desc *desc);
void lttng_probe_unregister(struct lttng_probe_desc *desc);
int lttng_fix_pending_events(void);
int lttng_probes_init(void);
void lttng_probes_exit(void);
int lttng_find_context(struct lttng_ctx *ctx, const char *name);
int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
void lttng_context_update(struct lttng_ctx *ctx);
void lttng_remove_context_field(struct lttng_ctx **ctx_p,
struct lttng_ctx_field *field);
void lttng_destroy_context(struct lttng_ctx *ctx);
int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
int lttng_add_dyntest_to_ctx(struct lttng_ctx **ctx);
void lttng_context_vtid_reset(void);
void lttng_context_vpid_reset(void);
#ifdef LTTNG_UST_HAVE_PERF_EVENT
int lttng_add_perf_counter_to_ctx(uint32_t type,
uint64_t config,
const char *name,
struct lttng_ctx **ctx);
int lttng_perf_counter_init(void);
void lttng_perf_counter_exit(void);
#else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
static inline
int lttng_add_perf_counter_to_ctx(uint32_t type,
uint64_t config,
const char *name,
struct lttng_ctx **ctx)
{
return -ENOSYS;
}
static inline
int lttng_perf_counter_init(void)
{
return 0;
}
static inline
void lttng_perf_counter_exit(void)
{
}
#endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
struct lttng_transport *lttng_transport_find(const char *name);
int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
struct lttng_ust_tracepoint_iter *
lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
struct lttng_ust_field_iter *
lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
void lttng_filter_event_link_bytecode(struct lttng_event *event);
void lttng_enabler_event_link_bytecode(struct lttng_event *event,
struct lttng_enabler *enabler);
void lttng_free_event_filter_runtime(struct lttng_event *event);
void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
struct cds_list_head *lttng_get_probe_list_head(void);
int lttng_session_active(void);
typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
void lttng_handle_pending_statedump(void *owner);
struct cds_list_head *_lttng_get_sessions(void);
struct lttng_enum *lttng_ust_enum_get(struct lttng_session *session,
const char *enum_name);
/* For backward compatibility. Leave those exported symbols in place. */
extern struct lttng_ctx *lttng_static_ctx;
void lttng_context_init(void);
void lttng_context_exit(void);
#ifdef __cplusplus
}
#endif
#endif /* _LTTNG_UST_EVENTS_H */