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 modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef _LTT_TRACE_KERNEL_H
  19 #define _LTT_TRACE_KERNEL_H
  20
  21 #include <limits.h>
  22 #include <urcu/list.h>
  23
  24 #include <lttng/lttng.h>
  25 #include <common/lttng-kernel.h>
  26
  27 /* Kernel event list */
  28 struct ltt_kernel_event_list {
  29         struct cds_list_head head;
  30 };
  31
  32 /* Channel stream list */
  33 struct ltt_kernel_stream_list {
  34         struct cds_list_head head;
  35 };
  36
  37 /* Channel list */
  38 struct ltt_kernel_channel_list {
  39         struct cds_list_head head;
  40 };
  41
  42 /* Kernel event */
  43 struct ltt_kernel_event {
  44         int fd;
  45         int enabled;
  46         /*
  47          * TODO: need internal representation to support more than a
  48          * single context.
  49          */
  50         struct lttng_kernel_context *ctx;
  51         struct lttng_kernel_event *event;
  52         struct cds_list_head list;
  53 };
  54
  55 /* Kernel channel */
  56 struct ltt_kernel_channel {
  57         int fd;
  58         int enabled;
  59         char *pathname;
  60         unsigned int stream_count;
  61         unsigned int event_count;
  62         /*
  63          * TODO: need internal representation to support more than a
  64          * single context.
  65          */
  66         struct lttng_kernel_context *ctx;
  67         struct lttng_channel *channel;
  68         struct ltt_kernel_event_list events_list;
  69         struct ltt_kernel_stream_list stream_list;
  70         struct cds_list_head list;
  71 };
  72
  73 /* Metadata */
  74 struct ltt_kernel_metadata {
  75         int fd;
  76         char *pathname;
  77         struct lttng_channel *conf;
  78 };
  79
  80 /* Channel stream */
  81 struct ltt_kernel_stream {
  82         int fd;
  83         char *pathname;
  84         int state;
  85         struct cds_list_head list;
  86 };
  87
  88 /* Kernel session */
  89 struct ltt_kernel_session {
  90         int fd;
  91         int metadata_stream_fd;
  92         int consumer_fds_sent;
  93         int consumer_fd;
  94         unsigned int channel_count;
  95         unsigned int stream_count_global;
  96         char *trace_path;
  97         struct ltt_kernel_metadata *metadata;
  98         struct ltt_kernel_channel_list channel_list;
  99         /* UID/GID of the user owning the session */
 100         uid_t uid;
 101         gid_t gid;
 102 };
 103
 104 /*
 105  * Lookup functions. NULL is returned if not found.
 106  */
 107 struct ltt_kernel_event *trace_kernel_get_event_by_name(
 108                 char *name, struct ltt_kernel_channel *channel);
 109 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 110                 char *name, struct ltt_kernel_session *session);
 111
 112 /*
 113  * Create functions malloc() the data structure.
 114  */
 115 struct ltt_kernel_session *trace_kernel_create_session(char *path);
 116 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
 117 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
 118 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
 119 struct ltt_kernel_stream *trace_kernel_create_stream(void);
 120
 121 /*
 122  * Destroy functions free() the data structure and remove from linked list if
 123  * it's applies.
 124  */
 125 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
 126 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
 127 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
 128 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
 129 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
 130
 131 #endif /* _LTT_TRACE_KERNEL_H */