*
* 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 as published by the Free Software Foundation; only
- * version 2.1 of the License.
+ * 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.
+ * 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
+ * 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>
+#include <netinet/in.h>
#include <stdint.h>
#include <sys/types.h>
-/* Default unix group name for tracing. */
-#define LTTNG_DEFAULT_TRACING_GROUP "tracing"
-
-/* Environment variable to set session daemon binary path. */
-#define LTTNG_SESSIOND_PATH_ENV "LTTNG_SESSIOND_PATH"
-
-/* Default trace output directory name */
-#define LTTNG_DEFAULT_TRACE_DIR_NAME "lttng-traces"
-
/*
* Event symbol length. Copied from LTTng kernel ABI.
*/
-#define LTTNG_SYMBOL_NAME_LEN 128
+#define LTTNG_SYMBOL_NAME_LEN 256
+
+/*
+ * Maximum length of a domain name. This is the limit for the total length of a
+ * domain name specified by the RFC 1035 (https://www.ietf.org/rfc/rfc1035.txt)
+ */
+#define LTTNG_MAX_DNNAME 255
/*
* Every lttng_event_* structure both apply to kernel event and user-space
*/
/*
- * Domain type are the different possible tracers.
+ * 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_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,
+};
+
/*
* LTTng consumer mode
*/
enum lttng_event_output {
- LTTNG_EVENT_SPLICE = 0,
- LTTNG_EVENT_MMAP = 1,
+ 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_COMM = 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_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,
};
enum lttng_calibrate_type {
- LTTNG_CALIBRATE_FUNCTION = 0,
+ LTTNG_CALIBRATE_FUNCTION = 0,
+};
+
+/* Destination type of lttng URI */
+enum lttng_dst_type {
+ LTTNG_DST_IPV4, /* IPv4 protocol */
+ LTTNG_DST_IPV6, /* IPv6 protocol */
+ LTTNG_DST_PATH, /* Local file system */
};
+/* Type of lttng URI where it is a final destination or a hop */
+enum lttng_uri_type {
+ LTTNG_URI_DST, /* The URI is a final destination */
+ /*
+ * Hop are not supported yet but planned for a future release.
+ *
+ LTTNG_URI_HOP,
+ */
+};
+
+/* Communication stream type of a lttng URI */
+enum lttng_stream_type {
+ LTTNG_STREAM_CONTROL,
+ LTTNG_STREAM_DATA,
+};
+
+/*
+ * Protocol type of a lttng URI. The value 0 indicate that the proto_type field
+ * should be ignored.
+ */
+enum lttng_proto_type {
+ LTTNG_TCP = 1,
+ /*
+ * UDP protocol is not supported for now.
+ *
+ LTTNG_UDP = 2,
+ */
+};
+
+/*
+ * Structure representing an URI supported by lttng.
+ */
+#define LTTNG_URI_PADDING1_LEN 16
+#define LTTNG_URI_PADDING2_LEN LTTNG_SYMBOL_NAME_LEN + 32
+struct lttng_uri {
+ enum lttng_dst_type dtype;
+ enum lttng_uri_type utype;
+ enum lttng_stream_type stype;
+ enum lttng_proto_type proto;
+ in_port_t port;
+ char padding[LTTNG_URI_PADDING1_LEN];
+ union {
+ char ipv4[INET_ADDRSTRLEN];
+ char ipv6[INET6_ADDRSTRLEN];
+ char path[PATH_MAX];
+ char padding[LTTNG_URI_PADDING2_LEN];
+ } dst;
+};
+
+/*
+ * The structures should be initialized to zero before use.
+ */
+#define LTTNG_DOMAIN_PADDING1 16
+#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_domain {
enum lttng_domain_type type;
+ char padding[LTTNG_DOMAIN_PADDING1];
+
union {
pid_t pid;
char exec_name[NAME_MAX];
+ char padding[LTTNG_DOMAIN_PADDING2];
} attr;
};
-/* Perf counter attributes */
+/*
+ * 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 */
+/*
+ * 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 16
+#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event {
- char name[LTTNG_SYMBOL_NAME_LEN];
enum lttng_event_type type;
- uint32_t enabled;
+ char name[LTTNG_SYMBOL_NAME_LEN];
+
+ enum lttng_loglevel_type loglevel_type;
+ int loglevel;
+
+ int32_t enabled; /* Does not apply: -1 */
pid_t pid;
+
+ 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;
+};
+
/*
* 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 + 32
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 */
+
+ 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[NAME_MAX];
+ 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];
};
/*
* 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 16
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 */
+
+ 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 a lttng domain type as parameter, if a bad value is
+ * 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.
+ * 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 an handle used as a context for every request made to the library.
+ * 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 on.
+ * 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. This will simply free(3) the data pointer returned by
- * lttng_create_handle() and rendering it unsuable.
+ * Destroy a handle. This will simply free(3) the data pointer returned by
+ * lttng_create_handle(), rendering it unusable.
*/
extern void lttng_destroy_handle(struct lttng_handle *handle);
/*
- * Create tracing session using a name and a path where trace will be written.
+ * Create a tracing session using a name and a path where the trace will be
+ * written.
*/
extern int lttng_create_session(const char *name, const char *path);
/*
- * Destroy tracing session.
+ * Destroy a tracing session.
*
- * The session will not be useable anymore, tracing will stopped for all
- * registered trace and tracing buffers will be flushed.
+ * The session will not be usable anymore, tracing will be stopped for all
+ * registered traces, and the tracing buffers will be flushed.
*/
-extern int lttng_destroy_session(struct lttng_handle *handle);
+extern int lttng_destroy_session(const char *name);
/*
- * List all tracing sessions.
+ * List all the tracing sessions.
*
- * Return the size of the "lttng_session" array. Caller must free(3).
+ * 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 registered domain(s) of a session.
+ * List the registered domain(s) of a session.
*
- * Return the size of the "lttng_domain" array. Caller must free(3).
+ * Return the size (number of entries) of the "lttng_domain" array. Caller
+ * must free(3).
*/
-extern int lttng_list_domains(struct lttng_handle *handle,
+extern int lttng_list_domains(const char *session_name,
struct lttng_domain **domains);
/*
- * List channel(s) of a session.
+ * List the channel(s) of a session.
*
- * Return the size of the "lttng_channel" array. Caller must free(3).
+ * 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 event(s) of a session channel.
+ * List the event(s) of a session channel.
*
- * Return the size of the "lttng_event" array. Caller must free(3).
+ * 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 available tracepoints of a specific lttng domain.
+ * List the available tracepoints of a specific lttng domain.
*
- * Return the size of the "lttng_event" array. Caller must free(3).
+ * 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 tracing group for the *current* flow of execution.
+ * Set the tracing group for the *current* flow of execution.
+ *
+ * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
*/
extern int lttng_set_tracing_group(const char *name);
/*
- * Return a human readable error message of a lttng-tools error code.
+ * 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 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).
+ * 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.
const char *socket_path);
/*
- * Start tracing for *all* registered trace (kernel and user-space).
+ * Start tracing for *all* registered traces (kernel and user-space).
*/
-extern int lttng_start_tracing(struct lttng_handle *handle);
+extern int lttng_start_tracing(const char *session_name);
/*
- * Stop tracing for *all* registered trace (kernel and user-space).
+ * Stop tracing for *all* registered traces (kernel and user-space).
*/
-extern int lttng_stop_tracing(struct lttng_handle *handle);
+extern int lttng_stop_tracing(const char *session_name);
/*
- * Add context to event for a specific channel.
+ * Add context to event(s) for a specific channel (or for all).
*
- * If event_name is NULL, the context is applied to all event of the channel.
+ * 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 on all events of all channels.
+ * If both are NULL, the context is applied to all events of all channels.
*/
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 a kernel event.
+ * 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).
*/
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).
+ * Create or enable a channel.
+ * The channel name cannot be NULL.
*/
extern int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan);
/*
- * Disable kernel event.
+ * Disable event(s) of a channel and domain.
*
+ * If event_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 kernel channel.
+ * Disable channel.
*
- * If channel_name is NULL, the default channel is disabled (channel0).
+ * The channel name cannot be NULL.
*/
extern int lttng_disable_channel(struct lttng_handle *handle,
const char *name);
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.
+ */
+extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
+ struct lttng_channel_attr *attr);
+
#endif /* _LTTNG_H */
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