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 <common/credentials.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         const struct lttng_credentials session_creds = {
  50                 .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid),
  51                 .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid),
  52         };
  53
  54         session->rotate_condition = lttng_condition_session_consumed_size_create();
  55         if (!session->rotate_condition) {
  56                 ERR("Failed to create session consumed size condition object");
  57                 ret = -1;
  58                 goto end;
  59         }
  60
  61         condition_status = lttng_condition_session_consumed_size_set_threshold(
  62                         session->rotate_condition, size);
  63         if (condition_status != LTTNG_CONDITION_STATUS_OK) {
  64                 ERR("Could not set session consumed size condition threshold (size = %" PRIu64 ")",
  65                                 size);
  66                 ret = -1;
  67                 goto end;
  68         }
  69
  70         condition_status =
  71                         lttng_condition_session_consumed_size_set_session_name(
  72                                 session->rotate_condition, session->name);
  73         if (condition_status != LTTNG_CONDITION_STATUS_OK) {
  74                 ERR("Could not set session consumed size condition session name (name = %s)",
  75                                 session->name);
  76                 ret = -1;
  77                 goto end;
  78         }
  79
  80         action = lttng_action_notify_create();
  81         if (!action) {
  82                 ERR("Could not create notify action");
  83                 ret = -1;
  84                 goto end;
  85         }
  86
  87         session->rotate_trigger = lttng_trigger_create(session->rotate_condition,
  88                         action);
  89         if (!session->rotate_trigger) {
  90                 ERR("Could not create size-based rotation trigger");
  91                 ret = -1;
  92                 goto end;
  93         }
  94
  95         /* Ensure this trigger is not visible to external users. */
  96         lttng_trigger_set_hidden(session->rotate_trigger);
  97         lttng_trigger_set_credentials(
  98                         session->rotate_trigger, &session_creds);
  99
 100         nc_status = lttng_notification_channel_subscribe(
 101                         rotate_notification_channel, session->rotate_condition);
 102         if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
 103                 ERR("Could not subscribe to session consumed size notification");
 104                 ret = -1;
 105                 goto end;
 106         }
 107
 108         ret = notification_thread_command_register_trigger(
 109                         notification_thread_handle, session->rotate_trigger,
 110                         true);
 111         if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) {
 112                 ERR("Register trigger, %s", lttng_strerror(ret));
 113                 ret = -1;
 114                 goto end;
 115         }
 116
 117         ret = 0;
 118
 119 end:
 120         return ret;
 121 }
 122
 123 int unsubscribe_session_consumed_size_rotation(struct ltt_session *session,
 124                 struct notification_thread_handle *notification_thread_handle)
 125 {
 126         int ret = 0;
 127         enum lttng_notification_channel_status status;
 128
 129         status = lttng_notification_channel_unsubscribe(
 130                         rotate_notification_channel,
 131                         session->rotate_condition);
 132         if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
 133                 ERR("Session unsubscribe error: %d", (int) status);
 134                 ret = -1;
 135                 goto end;
 136         }
 137
 138         ret = notification_thread_command_unregister_trigger(
 139                         notification_thread_handle, session->rotate_trigger);
 140         if (ret != LTTNG_OK) {
 141                 ERR("Session unregister trigger error: %d", ret);
 142                 goto end;
 143         }
 144
 145         ret = 0;
 146 end:
 147         return ret;
 148 }