#ifndef _LTTNG_H
#define _LTTNG_H
-#include <asm/types.h>
-#include <sys/types.h>
-#include <stdint.h>
#include <limits.h>
+#include <stdint.h>
+#include <sys/types.h>
/* Default unix group name for tracing. */
#define LTTNG_DEFAULT_TRACING_GROUP "tracing"
/*
* Event symbol length. Copied from LTTng kernel ABI.
*/
-#define LTTNG_SYMBOL_NAME_LEN 128
+#define LTTNG_SYMBOL_NAME_LEN 256
/*
* Every lttng_event_* structure both apply to kernel event and user-space
* Instrumentation type of tracing event.
*/
enum lttng_event_type {
- LTTNG_EVENT_TRACEPOINT,
- LTTNG_EVENT_PROBE,
- LTTNG_EVENT_FUNCTION,
- LTTNG_EVENT_FUNCTION_ENTRY,
+ 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,
+ LTTNG_EVENT_TRACEPOINT_LOGLEVEL = 6,
};
/*
LTTNG_EVENT_CONTEXT_VPPID = 9,
};
+enum lttng_calibrate_type {
+ LTTNG_CALIBRATE_FUNCTION = 0,
+};
+
struct lttng_domain {
enum lttng_domain_type type;
union {
*/
struct lttng_event {
char name[LTTNG_SYMBOL_NAME_LEN];
+ char loglevel[LTTNG_SYMBOL_NAME_LEN];
+ int64_t loglevel_value;
enum lttng_event_type type;
uint32_t enabled;
+ pid_t pid;
/* Per event type configuration */
union {
struct lttng_event_probe_attr probe;
struct lttng_channel_attr attr;
};
+struct lttng_calibrate {
+ enum lttng_calibrate_type type;
+};
+
/*
* Basic session information.
*
char name[NAME_MAX];
/* The path where traces are written */
char path[PATH_MAX];
+ uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
+};
+
+/*
+ * Handle used as a context for commands.
+ */
+struct lttng_handle {
+ char session_name[NAME_MAX];
+ struct lttng_domain domain;
};
/*
* array.
*
* On error, a negative value is returned being a specific lttng-tools error
- * code which can be humanly interpreted with lttng_get_readable_code(err).
+ * code which can be humanly interpreted with lttng_strerror(err).
+ */
+
+/*
+ * Create an 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 on.
*/
+extern struct lttng_handle *lttng_create_handle(const char *session_name,
+ struct lttng_domain *domain);
/*
- * Session daemon control
+ * Destroy an handle. This will simply free(3) the data pointer returned by
+ * lttng_create_handle() and rendering it unsuable.
*/
+extern void lttng_destroy_handle(struct lttng_handle *handle);
/*
* Create tracing session using a name and a path where trace will be written.
* The session will not be useable anymore, tracing will stopped for all
* registered trace and tracing buffers will be flushed.
*/
-extern int lttng_destroy_session(const char *name);
+extern int lttng_destroy_session(struct lttng_handle *handle);
/*
* List all tracing sessions.
*
* Return the size of the "lttng_domain" array. Caller must free(3).
*/
-extern int lttng_list_domains(const char *session_name,
+extern int lttng_list_domains(struct lttng_handle *handle,
struct lttng_domain **domains);
/*
*
* Return the size of the "lttng_channel" array. Caller must free(3).
*/
-extern int lttng_list_channels(struct lttng_domain *domain,
- const char *session_name, struct lttng_channel **channels);
+extern int lttng_list_channels(struct lttng_handle *handle,
+ struct lttng_channel **channels);
/*
* List event(s) of a session channel.
*
* Return the size of the "lttng_event" array. Caller must free(3).
*/
-extern int lttng_list_events(struct lttng_domain *domain,
- const char *session_name, const char *channel_name,
- struct lttng_event **events);
+extern int lttng_list_events(struct lttng_handle *handle,
+ const char *channel_name, struct lttng_event **events);
/*
- * List available tracepoints of domain.
+ * List available tracepoints of a specific lttng domain.
*
* Return the size of the "lttng_event" array. Caller must free(3).
*/
-extern int lttng_list_tracepoints(struct lttng_domain *domain,
+extern int lttng_list_tracepoints(struct lttng_handle *handle,
struct lttng_event **events);
/*
extern int lttng_set_tracing_group(const char *name);
/*
- * Set the session name of the *current* flow of execution.
+ * Return a human readable error message of a lttng-tools error code.
*
- * This is a VERY important things to do before doing any tracing actions. If
- * it's not done, you'll get an error saying that the session is not found.
- * It avoids the use of a session name on every API call.
+ * Parameter MUST be a negative value or else you'll get a generic message.
*/
-extern void lttng_set_session_name(const char *name);
+extern const char *lttng_strerror(int code);
/*
- * Return a human readable error message of a lttng-tools error code.
+ * This call permits to register an "outside consumer" to a session and a lttng
+ * domain. No consumer will be spawned and all fds/commands will go through the
+ * socket path given (socket_path).
*
- * Parameter MUST be a negative value or else you'll get a generic message.
+ * 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 const char *lttng_get_readable_code(int code);
+extern int lttng_register_consumer(struct lttng_handle *handle,
+ const char *socket_path);
/*
* Start tracing for *all* registered trace (kernel and user-space).
*/
-extern int lttng_start_tracing(const char *session_name);
+extern int lttng_start_tracing(struct lttng_handle *handle);
/*
* Stop tracing for *all* registered trace (kernel and user-space).
*/
-extern int lttng_stop_tracing(const char *session_name);
+extern int lttng_stop_tracing(struct lttng_handle *handle);
/*
* Add context to event for a specific channel.
* If channel_name is NULL, a lookup of the event's channel is done.
* If both are NULL, the context is applied on all events of all channels.
*/
-
-extern int lttng_add_context(struct lttng_domain *domain,
+extern int lttng_add_context(struct lttng_handle *handle,
struct lttng_event_context *ctx, const char *event_name,
const char *channel_name);
*
* If channel_name is NULL, the default channel is used (channel0).
*/
-extern int lttng_enable_event(struct lttng_domain *domain, struct lttng_event *ev,
- const char *channel_name);
+extern int lttng_enable_event(struct lttng_handle *handle,
+ struct lttng_event *ev, const char *channel_name);
/*
* Create or enable a kernel channel.
*
* If name is NULL, the default channel is enabled (channel0).
*/
-extern int lttng_enable_channel(struct lttng_domain *domain,
+extern int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan);
/*
*
* If channel_name is NULL, the default channel is used (channel0).
*/
-extern int lttng_disable_event(struct lttng_domain *domain, const char *name,
- const char *channel_name);
+extern int lttng_disable_event(struct lttng_handle *handle,
+ const char *name, const char *channel_name);
/*
* Disable kernel channel.
*
* If channel_name is NULL, the default channel is disabled (channel0).
*/
-extern int lttng_disable_channel(struct lttng_domain *domain,
+extern int lttng_disable_channel(struct lttng_handle *handle,
const char *name);
+/*
+ * Calibrate LTTng overhead.
+ */
+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.
+ */
+extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
+ struct lttng_channel_attr *attr);
+
#endif /* _LTTNG_H */
projects / lttng-tools.git / blobdiff