src/bin/lttng-sessiond/notification-thread-commands.h

   1 /*
   2  * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef NOTIFICATION_THREAD_COMMANDS_H
  19 #define NOTIFICATION_THREAD_COMMANDS_H
  20
  21 #include <lttng/domain.h>
  22 #include <lttng/lttng-error.h>
  23 #include <urcu/rculfhash.h>
  24
  25 struct notification_thread_data;
  26 struct lttng_trigger;
  27
  28 enum notification_thread_command_type {
  29         NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER,
  30         NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER,
  31         NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL,
  32         NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL,
  33 };
  34
  35 struct channel_key {
  36         uint64_t key;
  37         enum lttng_domain_type domain;
  38 };
  39
  40 struct channel_info {
  41         struct channel_key key;
  42         char *session_name;
  43         uid_t uid;
  44         gid_t gid;
  45         char *channel_name;
  46         uint64_t capacity;
  47         struct cds_lfht_node channels_ht_node;
  48 };
  49
  50 struct notification_thread_command {
  51         struct cds_list_head cmd_list_node;
  52
  53         enum notification_thread_command_type type;
  54         union {
  55                 /* Register/Unregister trigger. */
  56                 struct lttng_trigger *trigger;
  57                 /* Add channel. */
  58                 struct channel_info add_channel;
  59                 /* Remove channel. */
  60                 struct {
  61                         uint64_t key;
  62                         enum lttng_domain_type domain;
  63                 } remove_channel;
  64         } parameters;
  65
  66         /* Futex on which to wait for command reply (optional). */
  67         int32_t reply_futex;
  68         enum lttng_error_code reply_code;
  69 };
  70
  71 enum lttng_error_code notification_thread_command_register_trigger(
  72                 struct notification_thread_handle *handle,
  73                 struct lttng_trigger *trigger);
  74
  75 enum lttng_error_code notification_thread_command_unregister_trigger(
  76                 struct notification_thread_handle *handle,
  77                 struct lttng_trigger *trigger);
  78
  79 enum lttng_error_code notification_thread_command_add_channel(
  80                 struct notification_thread_handle *handle,
  81                 char *session_name, uid_t uid, gid_t gid,
  82                 char *channel_name, uint64_t key,
  83                 enum lttng_domain_type domain, uint64_t capacity);
  84
  85 enum lttng_error_code notification_thread_command_remove_channel(
  86                 struct notification_thread_handle *handle,
  87                 uint64_t key, enum lttng_domain_type domain);
  88
  89 #endif /* NOTIFICATION_THREAD_COMMANDS_H */