#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 */
* Domain types: the different possible tracers.
*/
enum lttng_domain_type {
- LTTNG_DOMAIN_KERNEL = 1,
- LTTNG_DOMAIN_UST = 2,
-
- /*
- * For now, the domains below are not implemented. However, we keep them
- * here in order to retain their enum values for future development. Note
- * that it is on the roadmap to implement them.
- *
- LTTNG_DOMAIN_UST_EXEC_NAME = 3,
- LTTNG_DOMAIN_UST_PID = 4,
- LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
- */
+ LTTNG_DOMAIN_KERNEL = 1, /* Linux Kernel tracer. */
+ LTTNG_DOMAIN_UST = 2, /* Global Userspace tracer. */
+ LTTNG_DOMAIN_JUL = 3, /* Java Util Logging. */
};
/*
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
*/
/* Event context possible type */
enum lttng_event_context_type {
LTTNG_EVENT_CONTEXT_PID = 0,
- LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
+ LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1, /* Backward compat. */
LTTNG_EVENT_CONTEXT_PROCNAME = 2,
LTTNG_EVENT_CONTEXT_PRIO = 3,
LTTNG_EVENT_CONTEXT_NICE = 4,
LTTNG_EVENT_CONTEXT_VPPID = 9,
LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10,
LTTNG_EVENT_CONTEXT_HOSTNAME = 11,
+ LTTNG_EVENT_CONTEXT_IP = 12,
+ LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER = 13,
+ LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER = 14,
};
enum lttng_calibrate_type {
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 16
+#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 {
*
* The structures should be initialized to zero before use.
*/
-#define LTTNG_EVENT_PADDING1 15
+#define LTTNG_EVENT_PADDING1 14
#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event {
enum lttng_event_type type;
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];
*
* The structures should be initialized to zero before use.
*/
-#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
+#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 */
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];
};
*
* The structures should be initialized to zero before use.
*/
-#define LTTNG_SESSION_PADDING1 16
+#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];
};
/*
* Public LTTng control API
+ */
+
+/*
+ * Create a tracing session using a name and an optional URL.
*
- * For functions having an lttng domain type as parameter, if a bad value is
- * given, NO default is applied and an error is returned.
+ * If _url_ is NULL, no consumer is created for the session. The name can't be
+ * NULL here.
*
- * On success, all functions of the API return 0 or the size of the allocated
- * array (in bytes).
+ * Return 0 on success else a negative LTTng error code.
+ */
+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.
*
- * On error, a negative value is returned being a specific lttng-tools error
- * code which can be humanly interpreted with lttng_strerror(err).
+ * Name can't be NULL. 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.
*
- * Exceptions to this are noted below.
+ * Return 0 on success else a negative LTTng error code.
*/
+extern int lttng_create_session_snapshot(const char *name,
+ const char *snapshot_url);
/*
- * Create a handle used as a context for every request made to the library.
+ * 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.
+ *
+ * Name can't be NULL. If no URL is given, the default is to send the data to
+ * net://127.0.0.1. The timer_interval is in usec and by default set to 1000000
+ * (1 second).
*
- * 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.
+ * Return 0 on success else a negative LTTng error code.
*/
-extern struct lttng_handle *lttng_create_handle(const char *session_name,
- struct lttng_domain *domain);
+extern int lttng_create_session_live(const char *name, const char *url,
+ unsigned int timer_interval);
/*
- * Destroy a handle. This will simply free(3) the data pointer returned by
- * lttng_create_handle(), rendering it unusable.
+ * Create an handle used as a context for every request made to the library.
+ *
+ * This handle contains the session name and domain on which the command will
+ * be executed. A domain is basically a tracer like the kernel or user space.
+ *
+ * Return an newly allocated handle that should be freed using
+ * lttng_destroy_handle. On error, NULL is returned.
*/
-extern void lttng_destroy_handle(struct lttng_handle *handle);
+extern struct lttng_handle *lttng_create_handle(const char *session_name,
+ struct lttng_domain *domain);
/*
- * Create a tracing session using a name and an optional URL.
+ * Destroy an handle that has been previously created with lttng_create_handle.
*
- * If _url_ is NULL, no consumer is created for the session.
+ * It free the given pointer making it unusable.
*/
-extern int lttng_create_session(const char *name, const char *url);
+extern void lttng_destroy_handle(struct lttng_handle *handle);
/*
* 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 session will not be usable, tracing will be stopped thus buffers will be
+ * flushed.
+ *
+ * The name can't be NULL here.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
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).
+ * must free sessions. On error, a negative LTTng error code is returned.
*/
extern int lttng_list_sessions(struct lttng_session **sessions);
/*
* List the registered domain(s) of a session.
*
+ * Session name CAN NOT be NULL.
+ *
* Return the size (number of entries) of the "lttng_domain" array. Caller
- * must free(3).
+ * must free domains. On error, a negative LTTng error code is returned.
*/
extern int lttng_list_domains(const char *session_name,
struct lttng_domain **domains);
/*
* List the channel(s) of a session.
*
+ * The handle CAN NOT be NULL.
+ *
* Return the size (number of entries) of the "lttng_channel" array. Caller
- * must free(3).
+ * must free channels. On error, a negative LTTng error code is returned.
*/
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).
+ * Both handle and channel_name CAN NOT be NULL.
+ *
+ * Return the size (number of entries) of the "lttng_event" array. Caller must
+ * free events. On error a negative LTTng error code is returned.
*/
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).
+ * The handle CAN NOT be NULL.
+ *
+ * Return the size (number of entries) of the "lttng_event" array. Caller must
+ * free events. On error a negative LTTng error code is returned.
*/
extern int lttng_list_tracepoints(struct lttng_handle *handle,
struct lttng_event **events);
/*
* List the available tracepoints fields of a specific lttng domain.
*
+ * The handle CAN NOT be NULL.
+ *
* Return the size (number of entries) of the "lttng_event_field" array.
- * Caller must free(3).
+ * Caller must free fields. On error a negative LTTng error code is
+ * returned.
*/
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.
+ * Return 1 if alive or 0 if not. On error, returns a negative negative LTTng
+ * error code.
*/
extern int lttng_session_daemon_alive(void);
/*
* Set the tracing group for the *current* flow of execution.
*
- * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
+ * On success, returns 0 else a negative LTTng error code.
*/
extern int lttng_set_tracing_group(const char *name);
/*
- * Return a human-readable error message for an lttng-tools error code.
+ * Return a human-readable error message for a LTTng error code.
*
* Parameter MUST be a negative value or else you'll get a generic message.
*/
* 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.
+ * NOTE that this is not recommended unless you absolutely know what you are
+ * doing.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_register_consumer(struct lttng_handle *handle,
const char *socket_path);
/*
- * Start tracing for *all* registered traces (kernel and user-space).
+ * Start tracing for *all* domain(s) in the session.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_start_tracing(const char *session_name);
/*
- * Stop tracing for *all* registered traces (kernel and user-space).
+ * Stop tracing for *all* domain(s) in the session.
+ *
+ * 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 analyze. Use the
+ * _no_wait call below to avoid this behavior.
+ *
+ * The session_name can't be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
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 event_name is NULL, the context is applied to all events of the channel.
- * 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.
+ * If the channel_name is NULL and they are no channel for the domain, the
+ * default channel is created (channel0). The context is then added on ALL
+ * channels since no name was specified.
+ *
+ * The event_name is ignored since adding a context to an event is not possible
+ * for now.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_add_context(struct lttng_handle *handle,
struct lttng_event_context *ctx, const char *event_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 event_name is NULL, all events are enabled.
- * If channel_name is NULL, the default channel is used (channel0).
+ * else it is enabled. If channel_name is NULL, the default channel is used
+ * (channel0).
+ *
+ * The handle and ev params can not be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_enable_event(struct lttng_handle *handle,
struct lttng_event *ev, const char *channel_name);
/*
- * Apply a filter expression to an event.
+ * Create or enable an event with a specific filter.
*
- * If event_name is NULL, the filter is applied to all events of the channel.
- * If channel_name is NULL, a lookup of the event's channel is done.
- * If both are NULL, the filter is applied to all events of all channels.
+ * 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.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
-extern int lttng_set_event_filter(struct lttng_handle *handle,
- const char *event_name,
- const char *channel_name,
+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.
+ *
+ * Return 0 on success else a negative LTTng error code.
+ */
+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 channel name cannot be NULL.
+ *
+ * The chan and handle params can not be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan);
/*
* Disable event(s) of a channel and domain.
*
- * If event_name is NULL, all events are disabled.
+ * If name is NULL, all events are disabled.
* If channel_name is NULL, the default channel is used (channel0).
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_disable_event(struct lttng_handle *handle,
const char *name, const char *channel_name);
/*
* Disable channel.
*
- * The channel name cannot be NULL.
+ * Name and handle CAN NOT be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
extern int lttng_disable_channel(struct lttng_handle *handle,
const char *name);
/*
* Calibrate LTTng overhead.
+ *
+ * The chan and handle params can not be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
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 either or both of the arguments are NULL, nothing happens.
+ * 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);
*
* Default port are 5342 and 5343 respectively for control and data which uses
* the TCP protocol.
+ *
+ * URL format: proto://[HOST|IP][:PORT1[:PORT2]][/TRACE_PATH]
+ *
+ * Possible protocols are:
+ * > file://...
+ * Local filesystem full path.
+ *
+ * > net[6]://...
+ * This will use the default network transport layer which is TCP for both
+ * control (PORT1) and data port (PORT2).
+ *
+ * > tcp[6]://...
+ * TCP only streaming. For this one, both data and control URL must be given.
+ *
+ * Return 0 on success else a negative LTTng error code.
*/
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 int lttng_enable_consumer(struct lttng_handle *handle);
+extern LTTNG_DEPRECATED("This call is now obsolete.")
+int lttng_enable_consumer(struct lttng_handle *handle);
/*
* Disable consumer for a session and domain.
*/
-extern int lttng_disable_consumer(struct lttng_handle *handle);
+extern LTTNG_DEPRECATED("This call is now obsolete.")
+int lttng_disable_consumer(struct lttng_handle *handle);
/*
* Check session daemon health for a specific component.
*
* 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 int lttng_health_check(enum lttng_health_component c);
+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) hence not ready to be used by
- * any readers.
+ * or is still being extracted by the consumer(s) (pending) hence not ready to
+ * be used by any readers.
*
- * Return 0 if the data is _NOT_ available else 1 if the data is ready. On
- * error, a negative value is returned and readable by lttng_strerror().
+ * 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_available(const char *session_name);
+extern int lttng_data_pending(const char *session_name);
#ifdef __cplusplus
}
projects / lttng-tools.git / blobdiff