ltt-sessiond/trace.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_H
  20 #define _LTT_TRACE_H
  21
  22 #include <limits.h>
  23 #include <urcu/list.h>
  24
  25 #include <lttng/lttng.h>
  26
  27 #include "lttng-kernel.h"
  28
  29 /* Kernel event list */
  30 struct ltt_kernel_event_list {
  31         struct cds_list_head head;
  32 };
  33
  34 /* Channel stream list */
  35 struct ltt_kernel_stream_list {
  36         struct cds_list_head head;
  37 };
  38
  39 /* Channel list */
  40 struct ltt_kernel_channel_list {
  41         struct cds_list_head head;
  42 };
  43
  44 /* Kernel event */
  45 struct ltt_kernel_event {
  46         int fd;
  47         int enabled;
  48         struct lttng_kernel_context *ctx;
  49         struct lttng_kernel_event *event;
  50         struct cds_list_head list;
  51 };
  52
  53 /* Kernel channel */
  54 struct ltt_kernel_channel {
  55         int fd;
  56         int enabled;
  57         char *pathname;
  58         unsigned int stream_count;
  59         unsigned int event_count;
  60         struct lttng_kernel_context *ctx;
  61         struct lttng_channel *channel;
  62         struct ltt_kernel_event_list events_list;
  63         struct ltt_kernel_stream_list stream_list;
  64         struct cds_list_head list;
  65 };
  66
  67 /* Metadata */
  68 struct ltt_kernel_metadata {
  69         int fd;
  70         char *pathname;
  71         struct lttng_channel *conf;
  72 };
  73
  74 /* Channel stream */
  75 struct ltt_kernel_stream {
  76         int fd;
  77         char *pathname;
  78         int state;
  79         struct cds_list_head list;
  80 };
  81
  82 /* Kernel session */
  83 struct ltt_kernel_session {
  84         int fd;
  85         int metadata_stream_fd;
  86         int kconsumer_fds_sent;
  87         unsigned int channel_count;
  88         unsigned int stream_count_global;
  89         struct ltt_kernel_metadata *metadata;
  90         struct ltt_kernel_channel_list channel_list;
  91 };
  92
  93 /* UST trace representation */
  94 struct ltt_ust_trace {
  95         struct cds_list_head list;
  96         char name[NAME_MAX];
  97         int shmid;
  98         pid_t pid;
  99         struct cds_list_head markers;
 100 };
 101
 102 struct ltt_ust_marker {
 103         struct cds_list_head list;
 104         char *name;
 105         char *channel;
 106 };
 107
 108 /*
 109  * Get functions.
 110  */
 111 struct ltt_kernel_event *get_kernel_event_by_name(
 112                 char *name, struct ltt_kernel_channel *channel);
 113 struct ltt_kernel_channel *get_kernel_channel_by_name(
 114                 char *name, struct ltt_kernel_session *session);
 115
 116 /*
 117  * Create functions malloc() the data structure.
 118  */
 119 struct ltt_kernel_session *trace_create_kernel_session(void);
 120 struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan, char *path);
 121 struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev);
 122 struct ltt_kernel_metadata *trace_create_kernel_metadata(char *path);
 123 struct ltt_kernel_stream *trace_create_kernel_stream(void);
 124
 125 /*
 126  * Destroy functions free() the data structure and remove from linked list if
 127  * it's applies.
 128  */
 129 void trace_destroy_kernel_session(struct ltt_kernel_session *session);
 130 void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata);
 131 void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel);
 132 void trace_destroy_kernel_event(struct ltt_kernel_event *event);
 133 void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream);
 134
 135 #endif /* _LTT_TRACE_H */