#define _LTT_SESSION_H
#include <limits.h>
+#include <stdbool.h>
#include <urcu/list.h>
#include <common/hashtable/hashtable.h>
+#include <lttng/rotation.h>
#include "snapshot.h"
#include "trace-kernel.h"
*/
pthread_mutex_t lock;
struct cds_list_head list;
- int enabled; /* enabled/started flag */
uint64_t id; /* session unique identifier */
/* UID/GID of the user owning the session */
uid_t uid;
*/
struct consumer_output *consumer;
- /* Did a start command occured before the kern/ust session creation? */
- unsigned int started;
+ /* 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;
/*
* Timer set when the session is created for live reading.
*/
- int live_timer;
+ 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;
+ /* Number of session rotation for this session. */
+ uint64_t rotate_count;
+ /*
+ * Rotation is pending between the time it starts until the consumer has
+ * finished extracting the data. If the session uses a relay, data related
+ * to a rotation can still be in flight after that, see
+ * rotate_pending_relay.
+ */
+ bool rotate_pending;
+ /*
+ * True until the relay has finished the rotation of all the streams.
+ */
+ bool rotate_pending_relay;
+ /* Current state of a rotation. */
+ enum lttng_rotation_state rotation_state;
+ /*
+ * Number of channels waiting for a rotation.
+ * When this number reaches 0, we can handle the rename of the chunk
+ * folder and inform the client that the rotate is finished.
+ */
+ unsigned int nr_chan_rotate_pending;
+ 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 has completed the last
+ * rotation.
+ */
+ bool rotate_relay_pending_timer_enabled;
+ timer_t rotate_relay_pending_timer;
+ /* Timer to periodically rotate a session. */
+ bool rotate_timer_enabled;
+ timer_t rotate_timer;
+ uint64_t rotate_timer_period;
+ /* Value for size-based rotation, 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 occured since the last stop to rename the current
+ * chunk.
+ */
+ bool rotated_after_last_stop;
};
/* Prototypes */
void session_unlock(struct ltt_session *session);
void session_unlock_list(void);
-struct ltt_session *session_find_by_name(char *name);
+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);
int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);