ltt-sessiond/trace-kernel.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #ifndef _LTT_TRACE_KERNEL_H
  20 #define _LTT_TRACE_KERNEL_H
  21
  22 #include <limits.h>
  23 #include <urcu/list.h>
  24
  25 #include <lttng/lttng.h>
  26 #include <lttng-kernel.h>
  27
  28 /* Kernel event list */
  29 struct ltt_kernel_event_list {
  30         struct cds_list_head head;
  31 };
  32
  33 /* Channel stream list */
  34 struct ltt_kernel_stream_list {
  35         struct cds_list_head head;
  36 };
  37
  38 /* Channel list */
  39 struct ltt_kernel_channel_list {
  40         struct cds_list_head head;
  41 };
  42
  43 /* Kernel event */
  44 struct ltt_kernel_event {
  45         int fd;
  46         int enabled;
  47         struct lttng_kernel_context *ctx;
  48         struct lttng_kernel_event *event;
  49         struct cds_list_head list;
  50 };
  51
  52 /* Kernel channel */
  53 struct ltt_kernel_channel {
  54         int fd;
  55         int enabled;
  56         char *pathname;
  57         unsigned int stream_count;
  58         unsigned int event_count;
  59         struct lttng_kernel_context *ctx;
  60         struct lttng_channel *channel;
  61         struct ltt_kernel_event_list events_list;
  62         struct ltt_kernel_stream_list stream_list;
  63         struct cds_list_head list;
  64 };
  65
  66 /* Metadata */
  67 struct ltt_kernel_metadata {
  68         int fd;
  69         char *pathname;
  70         struct lttng_channel *conf;
  71 };
  72
  73 /* Channel stream */
  74 struct ltt_kernel_stream {
  75         int fd;
  76         char *pathname;
  77         int state;
  78         struct cds_list_head list;
  79 };
  80
  81 /* Kernel session */
  82 struct ltt_kernel_session {
  83         int fd;
  84         int metadata_stream_fd;
  85         int kconsumer_fds_sent;
  86         int consumer_fd;
  87         unsigned int channel_count;
  88         unsigned int stream_count_global;
  89         char *trace_path;
  90         struct ltt_kernel_metadata *metadata;
  91         struct ltt_kernel_channel_list channel_list;
  92 };
  93
  94 /*
  95  * Lookup functions. NULL is returned if not found.
  96  */
  97 struct ltt_kernel_event *trace_kernel_get_event_by_name(
  98                 char *name, struct ltt_kernel_channel *channel);
  99 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 100                 char *name, struct ltt_kernel_session *session);
 101
 102 /*
 103  * Create functions malloc() the data structure.
 104  */
 105 struct ltt_kernel_session *trace_kernel_create_session(void);
 106 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
 107 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
 108 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
 109 struct ltt_kernel_stream *trace_kernel_create_stream(void);
 110
 111 /*
 112  * Destroy functions free() the data structure and remove from linked list if
 113  * it's applies.
 114  */
 115 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
 116 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
 117 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
 118 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
 119 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
 120
 121 #endif /* _LTT_TRACE_KERNEL_H */