src/bin/lttng-sessiond/rotate.c

   1 /*
   2  * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
   3  * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #define _LGPL_SOURCE
  10 #include <lttng/trigger/trigger.h>
  11 #include <common/error.h>
  12 #include <common/config/session-config.h>
  13 #include <common/defaults.h>
  14 #include <common/utils.h>
  15 #include <common/futex.h>
  16 #include <common/align.h>
  17 #include <common/time.h>
  18 #include <common/hashtable/utils.h>
  19 #include <common/kernel-ctl/kernel-ctl.h>
  20 #include <sys/eventfd.h>
  21 #include <sys/stat.h>
  22 #include <time.h>
  23 #include <signal.h>
  24 #include <inttypes.h>
  25
  26 #include <lttng/notification/channel-internal.h>
  27 #include <lttng/rotate-internal.h>
  28
  29 #include "session.h"
  30 #include "rotate.h"
  31 #include "rotation-thread.h"
  32 #include "lttng-sessiond.h"
  33 #include "health-sessiond.h"
  34 #include "cmd.h"
  35 #include "utils.h"
  36 #include "notification-thread-commands.h"
  37
  38 #include <urcu.h>
  39 #include <urcu/list.h>
  40 #include <urcu/rculfhash.h>
  41
  42 int subscribe_session_consumed_size_rotation(struct ltt_session *session, uint64_t size,
  43                 struct notification_thread_handle *notification_thread_handle)
  44 {
  45         int ret;
  46         enum lttng_condition_status condition_status;
  47         enum lttng_notification_channel_status nc_status;
  48         struct lttng_action *action;
  49
  50         session->rotate_condition = lttng_condition_session_consumed_size_create();
  51         if (!session->rotate_condition) {
  52                 ERR("Failed to create session consumed size condition object");
  53                 ret = -1;
  54                 goto end;
  55         }
  56
  57         condition_status = lttng_condition_session_consumed_size_set_threshold(
  58                         session->rotate_condition, size);
  59         if (condition_status != LTTNG_CONDITION_STATUS_OK) {
  60                 ERR("Could not set session consumed size condition threshold (size = %" PRIu64 ")",
  61                                 size);
  62                 ret = -1;
  63                 goto end;
  64         }
  65
  66         condition_status =
  67                         lttng_condition_session_consumed_size_set_session_name(
  68                                 session->rotate_condition, session->name);
  69         if (condition_status != LTTNG_CONDITION_STATUS_OK) {
  70                 ERR("Could not set session consumed size condition session name (name = %s)",
  71                                 session->name);
  72                 ret = -1;
  73                 goto end;
  74         }
  75
  76         action = lttng_action_notify_create();
  77         if (!action) {
  78                 ERR("Could not create notify action");
  79                 ret = -1;
  80                 goto end;
  81         }
  82
  83         session->rotate_trigger = lttng_trigger_create(session->rotate_condition,
  84                         action);
  85         if (!session->rotate_trigger) {
  86                 ERR("Could not create size-based rotation trigger");
  87                 ret = -1;
  88                 goto end;
  89         }
  90
  91         lttng_trigger_set_credentials(
  92                         session->rotate_trigger, session->uid, session->gid);
  93
  94         nc_status = lttng_notification_channel_subscribe(
  95                         rotate_notification_channel, session->rotate_condition);
  96         if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
  97                 ERR("Could not subscribe to session consumed size notification");
  98                 ret = -1;
  99                 goto end;
 100         }
 101
 102         ret = notification_thread_command_register_trigger(
 103                         notification_thread_handle, session->rotate_trigger);
 104         if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) {
 105                 ERR("Register trigger, %s", lttng_strerror(ret));
 106                 ret = -1;
 107                 goto end;
 108         }
 109
 110         ret = 0;
 111
 112 end:
 113         return ret;
 114 }
 115
 116 int unsubscribe_session_consumed_size_rotation(struct ltt_session *session,
 117                 struct notification_thread_handle *notification_thread_handle)
 118 {
 119         int ret = 0;
 120         enum lttng_notification_channel_status status;
 121
 122         status = lttng_notification_channel_unsubscribe(
 123                         rotate_notification_channel,
 124                         session->rotate_condition);
 125         if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
 126                 ERR("Session unsubscribe error: %d", (int) status);
 127                 ret = -1;
 128                 goto end;
 129         }
 130
 131         ret = notification_thread_command_unregister_trigger(
 132                         notification_thread_handle, session->rotate_trigger);
 133         if (ret != LTTNG_OK) {
 134                 ERR("Session unregister trigger error: %d", ret);
 135                 goto end;
 136         }
 137
 138         ret = 0;
 139 end:
 140         return ret;
 141 }