+++ /dev/null
-/*
- * 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, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef _LTT_SESSION_H
-#define _LTT_SESSION_H
-
-#include <limits.h>
-#include <urcu/list.h>
-
-#include <common/hashtable/hashtable.h>
-#include <lttng/rotation.h>
-
-#include "snapshot.h"
-#include "trace-kernel.h"
-
-struct ltt_ust_session;
-
-/*
- * Tracing session list
- *
- * Statically declared in session.c and can be accessed by using
- * session_get_list() function that returns the pointer to the list.
- */
-struct ltt_session_list {
- /*
- * This lock protects any read/write access to the list and
- * next_uuid. All public functions in session.c acquire this
- * lock and release it before returning. If none of those
- * functions are used, the lock MUST be acquired in order to
- * iterate or/and do any actions on that list.
- */
- pthread_mutex_t lock;
-
- /*
- * Session unique ID generator. The session list lock MUST be
- * upon update and read of this counter.
- */
- uint64_t next_uuid;
-
- /* Linked list head */
- struct cds_list_head head;
-};
-
-/*
- * This data structure contains information needed to identify a tracing
- * session for both LTTng and UST.
- */
-struct ltt_session {
- char name[NAME_MAX];
- char hostname[HOST_NAME_MAX]; /* Local hostname. */
- struct ltt_kernel_session *kernel_session;
- struct ltt_ust_session *ust_session;
- /*
- * Protect any read/write on this session data structure. This lock must be
- * acquired *before* using any public functions declared below. Use
- * session_lock() and session_unlock() for that.
- */
- pthread_mutex_t lock;
- struct cds_list_head list;
- uint64_t id; /* session unique identifier */
- /* UID/GID of the user owning the session */
- uid_t uid;
- gid_t gid;
- /*
- * Network session handle. A value of 0 means that there is no remote
- * session established.
- */
- uint64_t net_handle;
- /*
- * This consumer is only set when the create_session_uri call is made.
- * This contains the temporary information for a consumer output. Upon
- * creation of the UST or kernel session, this consumer, if available, is
- * copied into those sessions.
- */
- struct consumer_output *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 every channel enabled
- * will be set in overwrite mode and mmap. It is considered exclusively for
- * snapshot purposes.
- */
- 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;
- /* 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;
- /* Current status of a rotation. */
- enum lttng_rotation_status rotation_status;
- /*
- * 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;
-};
-
-/* Prototypes */
-int session_create(char *name, uid_t uid, gid_t gid);
-int session_destroy(struct ltt_session *session);
-
-void session_lock(struct ltt_session *session);
-void session_lock_list(void);
-void session_unlock(struct ltt_session *session);
-void session_unlock_list(void);
-
-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);
-
-#endif /* _LTT_SESSION_H */
projects / lttng-tools.git / blobdiff