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 <urcu/list.h>
  22
  23 #include <lttng/lttng.h>
  24 #include <common/lttng-kernel.h>
  25 #include <common/lttng-kernel-old.h>
  26 #include <common/defaults.h>
  27
  28 #include "consumer.h"
  29
  30 /* Kernel event list */
  31 struct ltt_kernel_event_list {
  32         struct cds_list_head head;
  33 };
  34
  35 /* Channel stream list */
  36 struct ltt_kernel_stream_list {
  37         struct cds_list_head head;
  38 };
  39
  40 /* Channel list */
  41 struct ltt_kernel_channel_list {
  42         struct cds_list_head head;
  43 };
  44
  45 struct ltt_kernel_context {
  46         struct lttng_kernel_context ctx;
  47         struct cds_list_head list;
  48 };
  49
  50 /* Kernel event */
  51 struct ltt_kernel_event {
  52         int fd;
  53         int enabled;
  54         enum lttng_event_type type;
  55         struct lttng_kernel_event *event;
  56         struct cds_list_head list;
  57 };
  58
  59 /* Kernel channel */
  60 struct ltt_kernel_channel {
  61         int fd;
  62         int enabled;
  63         unsigned int stream_count;
  64         unsigned int event_count;
  65         struct cds_list_head ctx_list;
  66         struct lttng_channel *channel;
  67         struct ltt_kernel_event_list events_list;
  68         struct ltt_kernel_stream_list stream_list;
  69         struct cds_list_head list;
  70         /* Session pointer which has a reference to this object. */
  71         struct ltt_kernel_session *session;
  72 };
  73
  74 /* Metadata */
  75 struct ltt_kernel_metadata {
  76         int fd;
  77         struct lttng_channel *conf;
  78 };
  79
  80 /* Channel stream */
  81 struct ltt_kernel_stream {
  82         int fd;
  83         int state;
  84         int cpu;
  85         /* Format is %s_%d respectively channel name and CPU number. */
  86         char name[DEFAULT_STREAM_NAME_LEN];
  87         uint64_t tracefile_size;
  88         uint64_t tracefile_count;
  89         struct cds_list_head list;
  90 };
  91
  92 /* Kernel session */
  93 struct ltt_kernel_session {
  94         int fd;
  95         int metadata_stream_fd;
  96         int consumer_fds_sent;
  97         unsigned int channel_count;
  98         unsigned int stream_count_global;
  99         struct ltt_kernel_metadata *metadata;
 100         struct ltt_kernel_channel_list channel_list;
 101         /* UID/GID of the user owning the session */
 102         uid_t uid;
 103         gid_t gid;
 104         /*
 105          * Two consumer_output object are needed where one is needed for the
 106          * current output object and the second one is the temporary object used to
 107          * store URI being set by the lttng_set_consumer_uri call. Once
 108          * lttng_enable_consumer is called, the two pointers are swapped.
 109          */
 110         struct consumer_output *consumer;
 111         struct consumer_output *tmp_consumer;
 112         /* Tracing session id */
 113         uint64_t id;
 114         /* Session is active or not meaning it has been started or stopped. */
 115         unsigned int active:1;
 116         /* Tell or not if the session has to output the traces. */
 117         unsigned int output_traces;
 118         unsigned int snapshot_mode;
 119         unsigned int has_non_default_channel;
 120 };
 121
 122 /*
 123  * Lookup functions. NULL is returned if not found.
 124  */
 125 struct ltt_kernel_event *trace_kernel_get_event_by_name(
 126                 char *name, struct ltt_kernel_channel *channel,
 127                 enum lttng_event_type type);
 128 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 129                 char *name, struct ltt_kernel_session *session);
 130
 131 /*
 132  * Create functions malloc() the data structure.
 133  */
 134 struct ltt_kernel_session *trace_kernel_create_session(void);
 135 struct ltt_kernel_channel *trace_kernel_create_channel(
 136                 struct lttng_channel *chan);
 137 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
 138 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
 139 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
 140                 unsigned int count);
 141 struct ltt_kernel_context *trace_kernel_create_context(
 142                 struct lttng_kernel_context *ctx);
 143
 144 /*
 145  * Destroy functions free() the data structure and remove from linked list if
 146  * it's applies.
 147  */
 148 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
 149 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
 150 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
 151 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
 152 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
 153 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
 154
 155 #endif /* _LTT_TRACE_KERNEL_H */