#ifndef _LTT_SESSION_H
#define _LTT_SESSION_H
+#include <limits.h>
+#include <stdbool.h>
#include <urcu/list.h>
+#include <common/hashtable/hashtable.h>
+#include <lttng/rotation.h>
+#include <lttng/location.h>
+
+#include "snapshot.h"
#include "trace-kernel.h"
-#include "trace-ust.h"
+#include "consumer.h"
+
+struct ltt_ust_session;
/*
* Tracing session list
* iterate or/and do any actions on that list.
*/
pthread_mutex_t lock;
+ /*
+ * This condition variable is signaled on every removal from
+ * the session list.
+ */
+ pthread_cond_t removal_cond;
/*
* Session unique ID generator. The session list lock MUST be
* upon update and read of this counter.
*/
- unsigned int next_uuid;
+ uint64_t next_uuid;
/* Linked list head */
struct cds_list_head head;
*/
struct ltt_session {
char name[NAME_MAX];
- char path[PATH_MAX];
+ char hostname[HOST_NAME_MAX]; /* Local hostname. */
struct ltt_kernel_session *kernel_session;
struct ltt_ust_session *ust_session;
+ struct urcu_ref ref;
/*
* Protect any read/write on this session data structure. This lock must be
* acquired *before* using any public functions declared below. Use
*/
pthread_mutex_t lock;
struct cds_list_head list;
- int enabled; /* enabled/started flag */
- unsigned int id; /* session unique identifier */
+ uint64_t id; /* session unique identifier */
+ /* Indicates if the session has been added to the session list and ht.*/
+ bool published;
+ /* Indicates if a destroy command has been applied to this session. */
+ bool destroyed;
/* UID/GID of the user owning the session */
uid_t uid;
gid_t gid;
*/
struct consumer_output *consumer;
- /* Indicates whether or not we have to spawn consumer(s) */
- unsigned int start_consumer;
+ /* Did at least ONE start command has been triggered?. */
+ unsigned int has_been_started:1;
+ /*
+ * Is the session active? Start trace command sets this to 1 and the stop
+ * command reset it to 0.
+ */
+ unsigned int active:1;
+
+ /* Snapshot representation in a session. */
+ struct snapshot snapshot;
+ /* Indicate if the session has to output the traces or not. */
+ unsigned int output_traces;
+ /*
+ * This session is in snapshot mode. This means that channels enabled
+ * will be set in overwrite mode by default and must be in mmap
+ * output mode. Note that snapshots can be taken on a session that
+ * is not in "snapshot_mode". This parameter only affects channel
+ * creation defaults.
+ */
+ unsigned int snapshot_mode;
+ /*
+ * Timer set when the session is created for live reading.
+ */
+ unsigned int live_timer;
+ /*
+ * Path where to keep the shared memory files.
+ */
+ char shm_path[PATH_MAX];
+ /*
+ * Node in ltt_sessions_ht_by_id.
+ */
+ struct lttng_ht_node_u64 node;
+ /*
+ * The current archive id corresponds to the number of session rotations
+ * that have occurred for this session. The archive id
+ * is used to tag the "generation" of a stream. This tag allows the
+ * consumer and relay daemons to track when a given stream was created
+ * during the lifetime of a session.
+ *
+ * For instance, if a stream is created after a session rotation was
+ * launched, the consumer and relay daemons must not check its position
+ * to determine if that specific session rotation was completed. It is
+ * implicitly "completed" since the stream appeared _after_ the session
+ * rotation was initiated.
+ */
+ uint64_t current_archive_id;
+ /*
+ * Rotation is considered pending between the time it is launched up
+ * until the moment when the data has been writen at the destination
+ * and the trace archive has been renamed.
+ *
+ * When tracing locally, only 'rotation_pending_local' is used since
+ * no remote checks are needed. However, when tracing to a relay daemon,
+ * a second check is needed to ensure that the data has been
+ * commited at the remote destination.
+ */
+ bool rotation_pending_local;
+ bool rotation_pending_relay;
+ /* Current state of a rotation. */
+ enum lttng_rotation_state rotation_state;
+ struct {
+ /*
+ * When the rotation is in progress, the temporary path name is
+ * stored here. When the rotation is complete, the final path name
+ * is here and can be queried with the rotate_pending call.
+ */
+ char current_rotate_path[LTTNG_PATH_MAX];
+ /*
+ * The path where the consumer is currently writing after the first
+ * session rotation.
+ */
+ char active_tracing_path[LTTNG_PATH_MAX];
+ } rotation_chunk;
+ /*
+ * The timestamp of the beginning of the previous chunk. For the
+ * first chunk, this is the "lttng start" timestamp. For the
+ * subsequent ones, this copies the current_chunk_start_ts value when
+ * a new rotation starts. This value is used to set the name of a
+ * complete chunk directory, ex: "last_chunk_start_ts-now()".
+ */
+ time_t last_chunk_start_ts;
+ /*
+ * This is the timestamp when a new chunk starts. When a new rotation
+ * starts, we copy this value to last_chunk_start_ts and replace it
+ * with the current timestamp.
+ */
+ time_t current_chunk_start_ts;
+ /*
+ * Timer to check periodically if a relay and/or consumer has completed
+ * the last rotation.
+ */
+ bool rotation_pending_check_timer_enabled;
+ timer_t rotation_pending_check_timer;
+ /* Timer to periodically rotate a session. */
+ bool rotation_schedule_timer_enabled;
+ timer_t rotation_schedule_timer;
+ /* Value for periodic rotations, 0 if disabled. */
+ uint64_t rotate_timer_period;
+ /* Value for size-based rotations, 0 if disabled. */
+ uint64_t rotate_size;
+ /*
+ * Keep a state if this session was rotated after the last stop command.
+ * We only allow one rotation after a stop. At destroy, we also need to
+ * know if a rotation occurred since the last stop to rename the current
+ * chunk.
+ */
+ bool rotated_after_last_stop;
+ /*
+ * Condition and trigger for size-based rotations.
+ */
+ struct lttng_condition *rotate_condition;
+ struct lttng_trigger *rotate_trigger;
};
/* Prototypes */
-int session_create(char *name, char *path, uid_t uid, gid_t gid);
-int session_destroy(struct ltt_session *session);
+int session_create(char *name, uid_t uid, gid_t gid);
void session_lock(struct ltt_session *session);
void session_lock_list(void);
+int session_trylock_list(void);
void session_unlock(struct ltt_session *session);
void session_unlock_list(void);
-struct ltt_session *session_find_by_name(char *name);
+void session_destroy(struct ltt_session *session);
+
+bool session_get(struct ltt_session *session);
+void session_put(struct ltt_session *session);
+
+enum consumer_dst_type session_get_consumer_destination_type(
+ const struct ltt_session *session);
+const char *session_get_net_consumer_hostname(
+ const struct ltt_session *session);
+void session_get_net_consumer_ports(
+ const struct ltt_session *session,
+ uint16_t *control_port, uint16_t *data_port);
+struct lttng_trace_archive_location *session_get_trace_archive_location(
+ struct ltt_session *session);
+
+struct ltt_session *session_find_by_name(const char *name);
+struct ltt_session *session_find_by_id(uint64_t id);
+
struct ltt_session_list *session_get_list(void);
+void session_list_wait_empty(void);
int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);
+int session_reset_rotation_state(struct ltt_session *session,
+ enum lttng_rotation_state result);
+
#endif /* _LTT_SESSION_H */
projects / lttng-tools.git / blobdiff