src/bin/lttng-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 <common/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         /*
  48          * TODO: need internal representation to support more than a
  49          * single context.
  50          */
  51         struct lttng_kernel_context *ctx;
  52         struct lttng_kernel_event *event;
  53         struct cds_list_head list;
  54 };
  55
  56 /* Kernel channel */
  57 struct ltt_kernel_channel {
  58         int fd;
  59         int enabled;
  60         char *pathname;
  61         unsigned int stream_count;
  62         unsigned int event_count;
  63         /*
  64          * TODO: need internal representation to support more than a
  65          * single context.
  66          */
  67         struct lttng_kernel_context *ctx;
  68         struct lttng_channel *channel;
  69         struct ltt_kernel_event_list events_list;
  70         struct ltt_kernel_stream_list stream_list;
  71         struct cds_list_head list;
  72 };
  73
  74 /* Metadata */
  75 struct ltt_kernel_metadata {
  76         int fd;
  77         char *pathname;
  78         struct lttng_channel *conf;
  79 };
  80
  81 /* Channel stream */
  82 struct ltt_kernel_stream {
  83         int fd;
  84         char *pathname;
  85         int state;
  86         struct cds_list_head list;
  87 };
  88
  89 /* Kernel session */
  90 struct ltt_kernel_session {
  91         int fd;
  92         int metadata_stream_fd;
  93         int consumer_fds_sent;
  94         int consumer_fd;
  95         unsigned int channel_count;
  96         unsigned int stream_count_global;
  97         char *trace_path;
  98         struct ltt_kernel_metadata *metadata;
  99         struct ltt_kernel_channel_list channel_list;
 100         /* UID/GID of the user owning the session */
 101         uid_t uid;
 102         gid_t gid;
 103 };
 104
 105 /*
 106  * Lookup functions. NULL is returned if not found.
 107  */
 108 struct ltt_kernel_event *trace_kernel_get_event_by_name(
 109                 char *name, struct ltt_kernel_channel *channel);
 110 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 111                 char *name, struct ltt_kernel_session *session);
 112
 113 /*
 114  * Create functions malloc() the data structure.
 115  */
 116 struct ltt_kernel_session *trace_kernel_create_session(char *path);
 117 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
 118 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
 119 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
 120 struct ltt_kernel_stream *trace_kernel_create_stream(void);
 121
 122 /*
 123  * Destroy functions free() the data structure and remove from linked list if
 124  * it's applies.
 125  */
 126 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
 127 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
 128 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
 129 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
 130 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
 131
 132 #endif /* _LTT_TRACE_KERNEL_H */