src/bin/lttng-relayd/lttng-relayd.h

   1 /*
   2  * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      David Goulet <dgoulet@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef LTTNG_RELAYD_H
  20 #define LTTNG_RELAYD_H
  21
  22 #define _LGPL_SOURCE
  23 #include <limits.h>
  24 #include <urcu.h>
  25 #include <urcu/wfqueue.h>
  26 #include <urcu/list.h>
  27
  28 #include <common/hashtable/hashtable.h>
  29 #include <common/index/ctf-index.h>
  30
  31 #include "ctf-trace.h"
  32 #include "session.h"
  33
  34 /*
  35  * Queue used to enqueue relay requests
  36  */
  37 struct relay_cmd_queue {
  38         struct cds_wfq_queue queue;
  39         int32_t futex;
  40 };
  41
  42 enum connection_type {
  43         RELAY_DATA                  = 1,
  44         RELAY_CONTROL               = 2,
  45         RELAY_VIEWER_COMMAND        = 3,
  46         RELAY_VIEWER_NOTIFICATION   = 4,
  47 };
  48
  49 /*
  50  * Internal structure to map a socket with the corresponding session.
  51  * A hashtable indexed on the socket FD is used for the lookups.
  52  */
  53 struct relay_command {
  54         struct lttcomm_sock *sock;
  55         struct relay_session *session;
  56         struct cds_wfq_node node;
  57         struct lttng_ht_node_ulong sock_n;
  58         struct rcu_head rcu_node;
  59         enum connection_type type;
  60         /* protocol version to use for this session */
  61         uint32_t major;
  62         uint32_t minor;
  63         uint64_t session_id;
  64         struct cds_list_head recv_head;
  65         unsigned int version_check_done:1;
  66 };
  67
  68 struct relay_local_data {
  69         struct lttng_ht *sessions_ht;
  70 };
  71
  72 extern char *opt_output_path;
  73
  74 /*
  75  * Contains stream indexed by ID. This is important since many commands lookup
  76  * streams only by ID thus also keeping them in this hash table makes the
  77  * search O(1) instead of iterating over the ctf_traces_ht of the session.
  78  */
  79 extern struct lttng_ht *relay_streams_ht;
  80
  81 extern struct lttng_ht *viewer_streams_ht;
  82 extern struct lttng_ht *indexes_ht;
  83
  84 extern const char *tracing_group_name;
  85
  86 extern const char * const config_section_name;
  87
  88 void lttng_relay_notify_ready(void);
  89
  90 #endif /* LTTNG_RELAYD_H */