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 #include "notification-thread.h"
  25
  26 struct notification_thread_data;
  27 struct lttng_trigger;
  28
  29 enum notification_thread_command_type {
  30         NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER,
  31         NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER,
  32         NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL,
  33         NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL,
  34         NOTIFICATION_COMMAND_TYPE_QUIT,
  35 };
  36
  37 struct channel_key {
  38         uint64_t key;
  39         enum lttng_domain_type domain;
  40 };
  41
  42 struct channel_info {
  43         struct channel_key key;
  44         char *session_name;
  45         uid_t uid;
  46         gid_t gid;
  47         char *channel_name;
  48         uint64_t capacity;
  49         struct cds_lfht_node channels_ht_node;
  50 };
  51
  52 struct notification_thread_command {
  53         struct cds_list_head cmd_list_node;
  54
  55         enum notification_thread_command_type type;
  56         union {
  57                 /* Register/Unregister trigger. */
  58                 struct lttng_trigger *trigger;
  59                 /* Add channel. */
  60                 struct channel_info add_channel;
  61                 /* Remove channel. */
  62                 struct {
  63                         uint64_t key;
  64                         enum lttng_domain_type domain;
  65                 } remove_channel;
  66         } parameters;
  67
  68         /* Futex on which to wait for command reply (optional). */
  69         int32_t reply_futex;
  70         enum lttng_error_code reply_code;
  71 };
  72
  73 enum lttng_error_code notification_thread_command_register_trigger(
  74                 struct notification_thread_handle *handle,
  75                 struct lttng_trigger *trigger);
  76
  77 enum lttng_error_code notification_thread_command_unregister_trigger(
  78                 struct notification_thread_handle *handle,
  79                 struct lttng_trigger *trigger);
  80
  81 enum lttng_error_code notification_thread_command_add_channel(
  82                 struct notification_thread_handle *handle,
  83                 char *session_name, uid_t uid, gid_t gid,
  84                 char *channel_name, uint64_t key,
  85                 enum lttng_domain_type domain, uint64_t capacity);
  86
  87 enum lttng_error_code notification_thread_command_remove_channel(
  88                 struct notification_thread_handle *handle,
  89                 uint64_t key, enum lttng_domain_type domain);
  90
  91 void notification_thread_command_quit(
  92                 struct notification_thread_handle *handle);
  93
  94 #endif /* NOTIFICATION_THREAD_COMMANDS_H */