ltt-events.h

   1 /*
   2  * ltt-events.h
   3  *
   4  * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * Holds LTTng per-session event registry.
   7  */
   8
   9 #include <linux/list.h>
  10
  11 struct ltt_channel;
  12 struct ltt_session;
  13
  14 /*
  15  * ltt_event structure is referred to by the tracing fast path. It must be
  16  * kept small.
  17  */
  18 struct ltt_event {
  19         unsigned int id;
  20         struct ltt_channel *chan;
  21         void *filter;
  22         char *name;
  23         struct list_head list;          /* Event list */
  24 };
  25
  26 struct ltt_channel {
  27         struct channel *chan;           /* Channel buffers */
  28         /* Event ID management */
  29         struct ltt_session *session;
  30         unsigned int free_event_id;     /* Next event ID to allocate */
  31         struct list_head list;          /* Channel list */
  32         char name[PATH_MAX];
  33 };
  34
  35 struct ltt_session {
  36         int active;                     /* Is trace session active ? */
  37         struct list_head chan;          /* Channel list head */
  38         struct list_head events;        /* Event list head */
  39         struct list_head list;          /* Session list */
  40         char name[PATH_MAX];
  41 };
  42
  43 struct ltt_session *ltt_session_create(char *name);
  44 int ltt_session_destroy(struct ltt_session *session);
  45
  46 struct ltt_channel *ltt_channel_create(struct ltt_session *session, char *name,
  47                                        int overwrite, void *buf_addr,
  48                                        size_t subbuf_size, size_t num_subbuf,
  49                                        unsigned int switch_timer_interval,
  50                                        unsigned int read_timer_interval);
  51 int _ltt_channel_destroy(struct ltt_channel *chan);
  52
  53 struct ltt_event *ltt_event_create(struct ltt_channel *chan, char *name,
  54                                    void *filter);
  55 int _ltt_event_destroy(struct ltt_event *event);