Consumer rotate a channel

[lttng-tools.git] / src / bin / lttng-sessiond / session.h

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index a56473783fb7d5f8f93ef11f50a40f628eaf35e5..77f0bf7b1ee87ac4a7b7cd43c731ca0d63701ac4 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -18,8 +18,12 @@
 #ifndef _LTT_SESSION_H
 #define _LTT_SESSION_H
 
+#include <limits.h>
 #include <urcu/list.h>
 
+#include <common/hashtable/hashtable.h>
+
+#include "snapshot.h"
 #include "trace-kernel.h"
 
 struct ltt_ust_session;
@@ -44,7 +48,7 @@ struct ltt_session_list {
         * 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;
@@ -56,7 +60,7 @@ struct ltt_session_list {
  */
 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;
        /*
@@ -66,8 +70,7 @@ struct ltt_session {
         */
        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 */
        /* UID/GID of the user owning the session */
        uid_t uid;
        gid_t gid;
@@ -84,15 +87,40 @@ struct ltt_session {
         */
        struct consumer_output *consumer;
 
-       /* Did a start command occured before the kern/ust session creation? */
-       unsigned int started;
-       /* Procotol version to use with the relayd */
-       uint32_t major;
-       uint32_t minor;
+       /* 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;
 };
 
 /* Prototypes */
-int session_create(char *name, char *path, uid_t uid, gid_t gid);
+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);
@@ -100,7 +128,8 @@ void session_lock_list(void);
 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);