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 <urcu.h>
  24 #include <urcu/wfqueue.h>
  25 #include <common/hashtable/hashtable.h>
  26 #include <common/index/lttng-index.h>
  27
  28 /*
  29  * Queue used to enqueue relay requests
  30  */
  31 struct relay_cmd_queue {
  32         struct cds_wfq_queue queue;
  33         int32_t futex;
  34 };
  35
  36 enum connection_type {
  37         RELAY_DATA,
  38         RELAY_CONTROL,
  39 };
  40
  41 /*
  42  * Represents a session for the relay point of view
  43  */
  44 struct relay_session {
  45         /*
  46          * This session id is used to identify a set of stream to a tracing session
  47          * but also make sure we have a unique session id associated with a session
  48          * daemon which can provide multiple data source.
  49          */
  50         uint64_t id;
  51         struct lttcomm_sock *sock;
  52 };
  53
  54 /*
  55  * Represents a stream in the relay
  56  */
  57 struct relay_stream {
  58         uint64_t stream_handle;
  59         uint64_t prev_seq;      /* previous data sequence number encountered */
  60         struct lttng_ht_node_ulong stream_n;
  61         struct relay_session *session;
  62         struct rcu_head rcu_node;
  63         int fd;
  64         /* FD on which to write the index data. */
  65         int index_fd;
  66
  67         char *path_name;
  68         char *channel_name;
  69         /* on-disk circular buffer of tracefiles */
  70         uint64_t tracefile_size;
  71         uint64_t tracefile_size_current;
  72         uint64_t tracefile_count;
  73         uint64_t tracefile_count_current;
  74
  75         /* Information telling us when to close the stream  */
  76         unsigned int close_flag:1;
  77         uint64_t last_net_seq_num;
  78         /* Indicate if the stream was initialized for a data pending command. */
  79         unsigned int data_pending_check_done:1;
  80 };
  81
  82 /*
  83  * Internal structure to map a socket with the corresponding session.
  84  * A hashtable indexed on the socket FD is used for the lookups.
  85  */
  86 struct relay_command {
  87         struct lttcomm_sock *sock;
  88         struct relay_session *session;
  89         struct cds_wfq_node node;
  90         struct lttng_ht_node_ulong sock_n;
  91         struct rcu_head rcu_node;
  92         enum connection_type type;
  93         unsigned int version_check_done:1;
  94         /* protocol version to use for this session */
  95         uint32_t major;
  96         uint32_t minor;
  97 };
  98
  99 extern char *opt_output_path;
 100
 101 #endif /* LTTNG_RELAYD_H */