lttng-sessiond/trace-ust.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_UST_H
  20 #define _LTT_TRACE_UST_H
  21
  22 #include <config.h>
  23 #include <limits.h>
  24 #include <urcu.h>
  25 #include <urcu/list.h>
  26 #include <lttng/lttng.h>
  27
  28 #include "ust-ctl.h"
  29
  30 #include "../hashtable/rculfhash.h"
  31
  32 /* UST Stream list */
  33 struct ltt_ust_stream_list {
  34         unsigned int count;
  35         struct cds_list_head head;
  36 };
  37
  38 /* Context hash table nodes */
  39 struct ltt_ust_context {
  40         struct lttng_ust_context ctx;
  41         struct cds_lfht_node node;
  42 };
  43
  44 /* UST event */
  45 struct ltt_ust_event {
  46         unsigned int enabled;
  47         struct lttng_ust_event attr;
  48         struct cds_lfht *ctx;
  49         struct cds_lfht_node node;
  50 };
  51
  52 /* UST stream */
  53 struct ltt_ust_stream {
  54         int handle;
  55         char pathname[PATH_MAX];
  56         struct lttng_ust_object_data *obj;
  57         /* Using a list of streams to keep order. */
  58         struct cds_list_head list;
  59 };
  60
  61 /* UST channel */
  62 struct ltt_ust_channel {
  63         unsigned int enabled;
  64         char name[LTTNG_UST_SYM_NAME_LEN];
  65         char pathname[PATH_MAX];
  66         struct lttng_ust_channel attr;
  67         struct cds_lfht *ctx;
  68         struct cds_lfht *events;
  69         struct cds_lfht_node node;
  70 };
  71
  72 /* UST Metadata */
  73 struct ltt_ust_metadata {
  74         int handle;
  75         struct lttng_ust_object_data *obj;
  76         char pathname[PATH_MAX];              /* Trace file path name */
  77         struct lttng_ust_channel attr;
  78         struct lttng_ust_object_data *stream_obj;
  79 };
  80
  81 /* UST domain global (LTTNG_DOMAIN_UST) */
  82 struct ltt_ust_domain_global {
  83         struct cds_lfht *channels;
  84 };
  85
  86 /* UST domain pid (LTTNG_DOMAIN_UST_PID) */
  87 struct ltt_ust_domain_pid {
  88         pid_t pid;
  89         struct cds_lfht *channels;
  90         struct cds_lfht_node node;
  91 };
  92
  93 /* UST domain exec name (LTTNG_DOMAIN_UST_EXEC_NAME) */
  94 struct ltt_ust_domain_exec {
  95         char exec_name[LTTNG_UST_SYM_NAME_LEN];
  96         struct cds_lfht *channels;
  97         struct cds_lfht_node node;
  98 };
  99
 100 /* UST session */
 101 struct ltt_ust_session {
 102         int uid;   /* Unique identifier of session */
 103         int start_trace;
 104         char pathname[PATH_MAX];
 105         struct ltt_ust_domain_global domain_global;
 106         /*
 107          * Those two hash tables contains data for a specific UST domain and each
 108          * contains a HT of channels. See ltt_ust_domain_exec and
 109          * ltt_ust_domain_pid data structures.
 110          */
 111         struct cds_lfht *domain_pid;
 112         struct cds_lfht *domain_exec;
 113 };
 114
 115 #ifdef HAVE_LIBLTTNG_UST_CTL
 116
 117 /*
 118  * Lookup functions. NULL is returned if not found.
 119  */
 120 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
 121                 char *name);
 122 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
 123                 char *name);
 124
 125 /*
 126  * Create functions malloc() the data structure.
 127  */
 128 struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid,
 129                 struct lttng_domain *domain);
 130 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
 131                 char *path);
 132 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev);
 133 struct ltt_ust_metadata *trace_ust_create_metadata(char *path);
 134 struct ltt_ust_context *trace_ust_create_context(
 135                 struct lttng_event_context *ctx);
 136
 137 /*
 138  * Destroy functions free() the data structure and remove from linked list if
 139  * it's applies.
 140  */
 141 void trace_ust_destroy_session(struct ltt_ust_session *session);
 142 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata);
 143 void trace_ust_destroy_channel(struct ltt_ust_channel *channel);
 144 void trace_ust_destroy_event(struct ltt_ust_event *event);
 145
 146 #else /* HAVE_LIBLTTNG_UST_CTL */
 147
 148 static inline
 149 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
 150                 char *name)
 151 {
 152         return NULL;
 153 }
 154
 155 static inline
 156 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
 157                 char *name)
 158 {
 159         return NULL;
 160 }
 161
 162 static inline
 163 struct ltt_ust_session *trace_ust_create_session(char *path, pid_t pid,
 164                 struct lttng_domain *domain)
 165 {
 166         return NULL;
 167 }
 168 static inline
 169 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
 170                 char *path)
 171 {
 172         return NULL;
 173 }
 174 static inline
 175 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
 176 {
 177         return NULL;
 178 }
 179 static inline
 180 struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
 181 {
 182         return NULL;
 183 }
 184
 185 static inline
 186 void trace_ust_destroy_session(struct ltt_ust_session *session)
 187 {
 188 }
 189
 190 static inline
 191 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
 192 {
 193 }
 194
 195 static inline
 196 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 197 {
 198 }
 199
 200 static inline
 201 void trace_ust_destroy_event(struct ltt_ust_event *event)
 202 {
 203 }
 204 static inline
 205 struct ltt_ust_context *trace_ust_create_context(
 206                 struct lttng_event_context *ctx)
 207 {
 208         return NULL;
 209 }
 210
 211 #endif /* HAVE_LIBLTTNG_UST_CTL */
 212
 213 #endif /* _LTT_TRACE_UST_H */