/usr/include/lttng/lttng.h is in liblttng-ctl-dev 2.4.0-2ubuntu1.
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* lttng.h
*
* Linux Trace Toolkit Control Library Header File
*
* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, version 2.1 only,
* as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LTTNG_H
#define LTTNG_H
#include <limits.h>
/*
* Necessary to include the fixed width type limits on glibc versions older
* than 2.18 when building with a C++ compiler.
*/
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS
#include <stdint.h>
#undef __STDC_LIMIT_MACROS
#else /* #ifndef __STDC_LIMIT_MACROS */
#include <stdint.h>
#endif /* #else #ifndef __STDC_LIMIT_MACROS */
#include <sys/types.h>
/* Error codes that can be returned by API calls */
#include <lttng/lttng-error.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Event symbol length. Copied from LTTng kernel ABI.
*/
#define LTTNG_SYMBOL_NAME_LEN 256
/*
* Every lttng_event_* structure both apply to kernel event and user-space
* event.
*/
/*
* Domain types: the different possible tracers.
*/
enum lttng_domain_type {
LTTNG_DOMAIN_KERNEL = 1, /* Linux Kernel tracer. */
LTTNG_DOMAIN_UST = 2, /* Global Userspace tracer. */
LTTNG_DOMAIN_JUL = 3, /* Java Util Logging. */
};
/*
* Instrumentation type of tracing event.
*/
enum lttng_event_type {
LTTNG_EVENT_ALL = -1,
LTTNG_EVENT_TRACEPOINT = 0,
LTTNG_EVENT_PROBE = 1,
LTTNG_EVENT_FUNCTION = 2,
LTTNG_EVENT_FUNCTION_ENTRY = 3,
LTTNG_EVENT_NOOP = 4,
LTTNG_EVENT_SYSCALL = 5,
};
/*
* Loglevel information.
*/
enum lttng_loglevel_type {
LTTNG_EVENT_LOGLEVEL_ALL = 0,
LTTNG_EVENT_LOGLEVEL_RANGE = 1,
LTTNG_EVENT_LOGLEVEL_SINGLE = 2,
};
/*
* Available loglevels.
*/
enum lttng_loglevel {
LTTNG_LOGLEVEL_EMERG = 0,
LTTNG_LOGLEVEL_ALERT = 1,
LTTNG_LOGLEVEL_CRIT = 2,
LTTNG_LOGLEVEL_ERR = 3,
LTTNG_LOGLEVEL_WARNING = 4,
LTTNG_LOGLEVEL_NOTICE = 5,
LTTNG_LOGLEVEL_INFO = 6,
LTTNG_LOGLEVEL_DEBUG_SYSTEM = 7,
LTTNG_LOGLEVEL_DEBUG_PROGRAM = 8,
LTTNG_LOGLEVEL_DEBUG_PROCESS = 9,
LTTNG_LOGLEVEL_DEBUG_MODULE = 10,
LTTNG_LOGLEVEL_DEBUG_UNIT = 11,
LTTNG_LOGLEVEL_DEBUG_FUNCTION = 12,
LTTNG_LOGLEVEL_DEBUG_LINE = 13,
LTTNG_LOGLEVEL_DEBUG = 14,
};
/*
* Available loglevels for the JUL domain. Those are an exact map from the
* class java.util.logging.Level.
*/
enum lttng_loglevel_jul {
LTTNG_LOGLEVEL_JUL_OFF = INT32_MAX,
LTTNG_LOGLEVEL_JUL_SEVERE = 1000,
LTTNG_LOGLEVEL_JUL_WARNING = 900,
LTTNG_LOGLEVEL_JUL_INFO = 800,
LTTNG_LOGLEVEL_JUL_CONFIG = 700,
LTTNG_LOGLEVEL_JUL_FINE = 500,
LTTNG_LOGLEVEL_JUL_FINER = 400,
LTTNG_LOGLEVEL_JUL_FINEST = 300,
LTTNG_LOGLEVEL_JUL_ALL = INT32_MIN,
};
/*
* LTTng consumer mode
*/
enum lttng_event_output {
LTTNG_EVENT_SPLICE = 0,
LTTNG_EVENT_MMAP = 1,
};
/* Event context possible type */
enum lttng_event_context_type {
LTTNG_EVENT_CONTEXT_PID = 0,
LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
LTTNG_EVENT_CONTEXT_PROCNAME = 2,
LTTNG_EVENT_CONTEXT_PRIO = 3,
LTTNG_EVENT_CONTEXT_NICE = 4,
LTTNG_EVENT_CONTEXT_VPID = 5,
LTTNG_EVENT_CONTEXT_TID = 6,
LTTNG_EVENT_CONTEXT_VTID = 7,
LTTNG_EVENT_CONTEXT_PPID = 8,
LTTNG_EVENT_CONTEXT_VPPID = 9,
LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10,
LTTNG_EVENT_CONTEXT_HOSTNAME = 11,
LTTNG_EVENT_CONTEXT_IP = 12,
};
enum lttng_calibrate_type {
LTTNG_CALIBRATE_FUNCTION = 0,
};
/* Health component for the health check function. */
enum lttng_health_component {
LTTNG_HEALTH_CMD,
LTTNG_HEALTH_APP_MANAGE,
LTTNG_HEALTH_APP_REG,
LTTNG_HEALTH_KERNEL,
LTTNG_HEALTH_CONSUMER,
LTTNG_HEALTH_HT_CLEANUP,
LTTNG_HEALTH_APP_MANAGE_NOTIFY,
LTTNG_HEALTH_APP_REG_DISPATCH,
LTTNG_HEALTH_ALL,
};
/* Buffer type for a specific domain. */
enum lttng_buffer_type {
LTTNG_BUFFER_PER_PID, /* Only supported by UST being the default. */
LTTNG_BUFFER_PER_UID, /* Only supported by UST. */
LTTNG_BUFFER_GLOBAL, /* Only supported by the Kernel. */
};
/*
* The structures should be initialized to zero before use.
*/
#define LTTNG_DOMAIN_PADDING1 12
#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_domain {
enum lttng_domain_type type;
enum lttng_buffer_type buf_type;
char padding[LTTNG_DOMAIN_PADDING1];
union {
pid_t pid;
char exec_name[NAME_MAX];
char padding[LTTNG_DOMAIN_PADDING2];
} attr;
};
/*
* Perf counter attributes
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_PERF_EVENT_PADDING1 16
struct lttng_event_perf_counter_ctx {
uint32_t type;
uint64_t config;
char name[LTTNG_SYMBOL_NAME_LEN];
char padding[LTTNG_PERF_EVENT_PADDING1];
};
/*
* Event/channel context
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_EVENT_CONTEXT_PADDING1 16
#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event_context {
enum lttng_event_context_type ctx;
char padding[LTTNG_EVENT_CONTEXT_PADDING1];
union {
struct lttng_event_perf_counter_ctx perf_counter;
char padding[LTTNG_EVENT_CONTEXT_PADDING2];
} u;
};
/*
* Event probe.
*
* Either addr is used or symbol_name and offset.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_EVENT_PROBE_PADDING1 16
struct lttng_event_probe_attr {
uint64_t addr;
uint64_t offset;
char symbol_name[LTTNG_SYMBOL_NAME_LEN];
char padding[LTTNG_EVENT_PROBE_PADDING1];
};
/*
* Function tracer
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_EVENT_FUNCTION_PADDING1 16
struct lttng_event_function_attr {
char symbol_name[LTTNG_SYMBOL_NAME_LEN];
char padding[LTTNG_EVENT_FUNCTION_PADDING1];
};
/*
* Generic lttng event
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_EVENT_PADDING1 14
#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event {
enum lttng_event_type type;
char name[LTTNG_SYMBOL_NAME_LEN];
enum lttng_loglevel_type loglevel_type;
int loglevel;
int32_t enabled; /* Does not apply: -1 */
pid_t pid;
unsigned char filter; /* filter enabled ? */
unsigned char exclusion; /* exclusions added ? */
char padding[LTTNG_EVENT_PADDING1];
/* Per event type configuration */
union {
struct lttng_event_probe_attr probe;
struct lttng_event_function_attr ftrace;
char padding[LTTNG_EVENT_PADDING2];
} attr;
};
enum lttng_event_field_type {
LTTNG_EVENT_FIELD_OTHER = 0,
LTTNG_EVENT_FIELD_INTEGER = 1,
LTTNG_EVENT_FIELD_ENUM = 2,
LTTNG_EVENT_FIELD_FLOAT = 3,
LTTNG_EVENT_FIELD_STRING = 4,
};
#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event_field {
char field_name[LTTNG_SYMBOL_NAME_LEN];
enum lttng_event_field_type type;
char padding[LTTNG_EVENT_FIELD_PADDING];
struct lttng_event event;
int nowrite;
};
/*
* Tracer channel attributes. For both kernel and user-space.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 12
struct lttng_channel_attr {
int overwrite; /* 1: overwrite, 0: discard */
uint64_t subbuf_size; /* bytes */
uint64_t num_subbuf; /* power of 2 */
unsigned int switch_timer_interval; /* usec */
unsigned int read_timer_interval; /* usec */
enum lttng_event_output output; /* splice, mmap */
/* LTTng 2.1 padding limit */
uint64_t tracefile_size; /* bytes */
uint64_t tracefile_count; /* number of tracefiles */
/* LTTng 2.3 padding limit */
unsigned int live_timer_interval; /* usec */
char padding[LTTNG_CHANNEL_ATTR_PADDING1];
};
/*
* Channel information structure. For both kernel and user-space.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_CHANNEL_PADDING1 16
struct lttng_channel {
char name[LTTNG_SYMBOL_NAME_LEN];
uint32_t enabled;
struct lttng_channel_attr attr;
char padding[LTTNG_CHANNEL_PADDING1];
};
#define LTTNG_CALIBRATE_PADDING1 16
struct lttng_calibrate {
enum lttng_calibrate_type type;
char padding[LTTNG_CALIBRATE_PADDING1];
};
/*
* Basic session information.
*
* This is an 'output data' meaning that it only comes *from* the session
* daemon *to* the lttng client. It's basically a 'human' representation of
* tracing entities (here a session).
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_SESSION_PADDING1 12
struct lttng_session {
char name[NAME_MAX];
/* The path where traces are written */
char path[PATH_MAX];
uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
uint32_t snapshot_mode;
unsigned int live_timer_interval; /* usec */
char padding[LTTNG_SESSION_PADDING1];
};
/*
* Handle used as a context for commands.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_HANDLE_PADDING1 16
struct lttng_handle {
char session_name[NAME_MAX];
struct lttng_domain domain;
char padding[LTTNG_HANDLE_PADDING1];
};
/*
* Public LTTng control API
*
* For functions having an lttng domain type as parameter, if a bad value is
* given, NO default is applied and an error is returned.
*
* On success, all functions of the API return 0 or the size of the allocated
* array (in bytes).
*
* On error, a negative value is returned being a specific lttng-tools error
* code which can be humanly interpreted with lttng_strerror(err).
*
* Exceptions to this are noted below.
*/
/*
* Create a handle used as a context for every request made to the library.
*
* This handle contains the session name and lttng domain on which the command
* will be executed.
* The returned pointer will be NULL in case of malloc() error.
*/
extern struct lttng_handle *lttng_create_handle(const char *session_name,
struct lttng_domain *domain);
/*
* Destroy an handle.
*
* It free(3) the data pointer returned by lttng_create_handle(), rendering it
* unusable.
*/
extern void lttng_destroy_handle(struct lttng_handle *handle);
/*
* Create a tracing session using a name and an optional URL.
*
* If _url_ is NULL, no consumer is created for the session. The name can't be
* NULL here.
*/
extern int lttng_create_session(const char *name, const char *url);
/*
* Create a tracing session that will exclusively be used for snapshot meaning
* the session will be in no output mode and every channel enabled for that
* session will be set in overwrite mode and in mmap output since splice is not
* supported.
*
* If an url is given, it will be used to create a default snapshot output
* using it as a destination. If NULL, no output will be defined and an
* add-output call will be needed.
*
* Name can't be NULL.
*/
extern int lttng_create_session_snapshot(const char *name,
const char *snapshot_url);
/*
* Create a session exclusively used for live reading.
*
* In this mode, the switch-timer parameter is forced for each UST channel, a
* live-switch-timer is enabled for kernel channels, manually setting
* switch-timer is forbidden. Synchronization beacons are sent to the relayd,
* indexes are sent and metadata is checked for each packet.
*
* Returns LTTNG_OK on success or a negative error code.
*/
extern int lttng_create_session_live(const char *name, const char *url,
unsigned int timer_interval);
/*
* Destroy a tracing session.
*
* The session will not be usable anymore, tracing will be stopped for all
* registered traces, and the tracing buffers will be flushed.
*
* The name can't be NULL here.
*/
extern int lttng_destroy_session(const char *name);
/*
* List all the tracing sessions.
*
* Return the size (number of entries) of the "lttng_session" array. Caller
* must free(3).
*/
extern int lttng_list_sessions(struct lttng_session **sessions);
/*
* List the registered domain(s) of a session.
*
* Return the size (number of entries) of the "lttng_domain" array. Caller
* must free(3).
*/
extern int lttng_list_domains(const char *session_name,
struct lttng_domain **domains);
/*
* List the channel(s) of a session.
*
* Return the size (number of entries) of the "lttng_channel" array. Caller
* must free(3).
*/
extern int lttng_list_channels(struct lttng_handle *handle,
struct lttng_channel **channels);
/*
* List the event(s) of a session channel.
*
* Return the size (number of entries) of the "lttng_event" array.
* Caller must free(3).
*/
extern int lttng_list_events(struct lttng_handle *handle,
const char *channel_name, struct lttng_event **events);
/*
* List the available tracepoints of a specific lttng domain.
*
* Return the size (number of entries) of the "lttng_event" array.
* Caller must free(3).
*/
extern int lttng_list_tracepoints(struct lttng_handle *handle,
struct lttng_event **events);
/*
* List the available tracepoints fields of a specific lttng domain.
*
* Return the size (number of entries) of the "lttng_event_field" array.
* Caller must free(3).
*/
extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
struct lttng_event_field **fields);
/*
* Check if a session daemon is alive.
*
* Return 1 if alive or 0 if not. On error returns a negative value.
*/
extern int lttng_session_daemon_alive(void);
/*
* Set the tracing group for the *current* flow of execution.
*
* On success, returns 0 else a negative value on error being a lttng error
* code found in lttng-error.h
*/
extern int lttng_set_tracing_group(const char *name);
/*
* Return a human-readable error message for an lttng-tools error code.
*
* Parameter MUST be a negative value or else you'll get a generic message.
*/
extern const char *lttng_strerror(int code);
/*
* This call registers an "outside consumer" for a session and an lttng domain.
* No consumer will be spawned and all fds/commands will go through the socket
* path given (socket_path).
*
* NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
* command socket. The error socket is not supported yet for roaming consumers.
*/
extern int lttng_register_consumer(struct lttng_handle *handle,
const char *socket_path);
/*
* Start tracing for *all* registered traces (kernel and user-space).
*/
extern int lttng_start_tracing(const char *session_name);
/*
* Stop tracing for *all* registered traces (kernel and user-space).
*
* This call will wait for data availability for each domain of the session so
* this can take an abritrary amount of time. However, when returning you have
* the guarantee that the data is ready to be read and analyse. Use the
* _no_wait call below to avoid this behavior.
*
* The session_name can't be NULL.
*/
extern int lttng_stop_tracing(const char *session_name);
/*
* Behave exactly like lttng_stop_tracing but does not wait for data
* availability.
*/
extern int lttng_stop_tracing_no_wait(const char *session_name);
/*
* Add context to event(s) for a specific channel (or for all).
*
* If channel_name is NULL, a lookup of the event's channel is done. If both
* are NULL, the context is applied to all events of all channels.
*
* Note that whatever event_name value is, a context can not be added to an
* event, so we just ignore it for now.
*/
extern int lttng_add_context(struct lttng_handle *handle,
struct lttng_event_context *ctx, const char *event_name,
const char *channel_name);
/*
* Create or enable an event (or events) for a channel.
*
* If the event you are trying to enable does not exist, it will be created,
* else it is enabled.
* If channel_name is NULL, the default channel is used (channel0).
*
* The handle and ev params can not be NULL.
*/
extern int lttng_enable_event(struct lttng_handle *handle,
struct lttng_event *ev, const char *channel_name);
/*
* Create or enable an event with a specific filter.
*
* If the event you are trying to enable does not exist, it will be created,
* else it is enabled.
* If ev is NULL, all events are enabled with that filter.
* If channel_name is NULL, the default channel is used (channel0) and created
* if not found.
* If filter_expression is NULL, an event without associated filter is
* created.
*/
extern int lttng_enable_event_with_filter(struct lttng_handle *handle,
struct lttng_event *event, const char *channel_name,
const char *filter_expression);
/*
* Create or enable an event with a filter and/or exclusions.
*
* If the event you are trying to enable does not exist, it will be created,
* else it is enabled.
* If ev is NULL, all events are enabled with the filter and exclusion options.
* If channel_name is NULL, the default channel is used (channel0) and created
* if not found.
* If filter_expression is NULL, an event without associated filter is
* created.
* If exclusion count is zero, the event will be created without exclusions.
*/
extern int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
struct lttng_event *event, const char *channel_name,
const char *filter_expression,
int exclusion_count, char **exclusion_names);
/*
* Create or enable a channel.
*
* The chan and handle params can not be NULL.
*/
extern int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan);
/*
* Disable event(s) of a channel and domain.
*
* If name is NULL, all events are disabled.
* If channel_name is NULL, the default channel is used (channel0).
*/
extern int lttng_disable_event(struct lttng_handle *handle,
const char *name, const char *channel_name);
/*
* Disable channel.
*
*/
extern int lttng_disable_channel(struct lttng_handle *handle,
const char *name);
/*
* Calibrate LTTng overhead.
*
* The chan and handle params can not be NULL.
*/
extern int lttng_calibrate(struct lttng_handle *handle,
struct lttng_calibrate *calibrate);
/*
* Set the default channel attributes for a specific domain and an allocated
* lttng_channel_attr pointer.
*
* If one or both arguments are NULL, nothing happens.
*/
extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
struct lttng_channel_attr *attr);
/*
* Set URL for a consumer for a session and domain.
*
* Both data and control URL must be defined. If both URLs are the same, only
* the control URL is used even for network streaming.
*
* Default port are 5342 and 5343 respectively for control and data which uses
* the TCP protocol.
*/
extern int lttng_set_consumer_url(struct lttng_handle *handle,
const char *control_url, const char *data_url);
/*
* Enable the consumer for a session and domain.
*/
extern LTTNG_DEPRECATED("This call is now obsolete.")
int lttng_enable_consumer(struct lttng_handle *handle);
/*
* Disable consumer for a session and domain.
*/
extern LTTNG_DEPRECATED("This call is now obsolete.")
int lttng_disable_consumer(struct lttng_handle *handle);
/*
* Check session daemon health for a specific component.
*
* Return 0 if health is OK or 1 if BAD. A returned value of -1 indicate that
* the control library was not able to connect to the session daemon health
* socket.
*
* Any other positive value is an lttcomm error which can be translate with
* lttng_strerror().
*
* Please see lttng-health-check(3) man page for more information.
*/
extern LTTNG_DEPRECATED("This call is now obsolete.")
int lttng_health_check(enum lttng_health_component c);
/*
* For a given session name, this call checks if the data is ready to be read
* or is still being extracted by the consumer(s) (pending) hence not ready to
* be used by any readers.
*
* Return 0 if there is _no_ data pending in the buffers thus having a
* guarantee that the data can be read safely. Else, return 1 if there is still
* traced data is pending. On error, a negative value is returned and readable
* by lttng_strerror().
*/
extern int lttng_data_pending(const char *session_name);
#ifdef __cplusplus
}
#endif
#endif /* LTTNG_H */
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