*
* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * 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 <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
* Domain type are the different possible tracers.
*/
enum lttng_domain_type {
- LTTNG_DOMAIN_KERNEL,
- LTTNG_DOMAIN_UST,
- LTTNG_DOMAIN_UST_EXEC_NAME,
- LTTNG_DOMAIN_UST_PID,
- LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN,
-};
-
-struct lttng_domain {
- enum lttng_domain_type type;
- union {
- pid_t pid;
- char exec_name[NAME_MAX];
- } attr;
+ LTTNG_DOMAIN_KERNEL = 1,
+ LTTNG_DOMAIN_UST = 2,
+ LTTNG_DOMAIN_UST_EXEC_NAME = 3,
+ LTTNG_DOMAIN_UST_PID = 4,
+ LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
};
/*
* Instrumentation type of tracing event.
*/
enum lttng_event_type {
- LTTNG_EVENT_TRACEPOINT,
- LTTNG_EVENT_PROBE,
- LTTNG_EVENT_FUNCTION,
+ 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 {
+ pid_t pid;
+ char exec_name[NAME_MAX];
+ } attr;
+};
+
/* Perf counter attributes */
struct lttng_event_perf_counter_ctx {
uint32_t type;
*/
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;
* Channel information structure. For both kernel and user-space.
*/
struct lttng_channel {
- char name[NAME_MAX];
+ char name[LTTNG_SYMBOL_NAME_LEN];
+ uint32_t enabled;
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).
*/
/*
- * Session daemon control
+ * 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);
+
+/*
+ * 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.
extern int lttng_destroy_session(const char *name);
/*
- * List tracing sessions.
+ * List all tracing sessions.
*
- * Return the size of the "lttng_session" array. Caller must free(3) the
- * returned data.
+ * Return the size of the "lttng_session" array. Caller must free(3).
*/
extern int lttng_list_sessions(struct lttng_session **sessions);
+/*
+ * List registered domain(s) of a session.
+ *
+ * Return the size of the "lttng_domain" array. Caller must free(3).
+ */
+extern int lttng_list_domains(const char *session_name,
+ struct lttng_domain **domains);
+
+/*
+ * List channel(s) of a session.
+ *
+ * Return the size of the "lttng_channel" array. Caller must free(3).
+ */
+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_handle *handle,
+ const char *channel_name, struct lttng_event **events);
+
+/*
+ * 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_handle *handle,
+ struct lttng_event **events);
+
/*
* Check if a session daemon is alive.
*/
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).
* 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);
/*
- * List kernel events.
- *
- * Return the size of the allocated event list. Caller must free(3) the data.
+ * 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 int lttng_list_events(struct lttng_domain *domain, char **event_list);
+extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
+ struct lttng_channel_attr *attr);
#endif /* _LTTNG_H */