port: no eventfd support on FreeBSD
[lttng-tools.git] / 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 = session->uid,
51 .gid = 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 lttng_trigger_set_credentials(
96 session->rotate_trigger, &session_creds);
97
98 nc_status = lttng_notification_channel_subscribe(
99 rotate_notification_channel, session->rotate_condition);
100 if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
101 ERR("Could not subscribe to session consumed size notification");
102 ret = -1;
103 goto end;
104 }
105
106 ret = notification_thread_command_register_trigger(
107 notification_thread_handle, session->rotate_trigger);
108 if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) {
109 ERR("Register trigger, %s", lttng_strerror(ret));
110 ret = -1;
111 goto end;
112 }
113
114 ret = 0;
115
116 end:
117 return ret;
118 }
119
120 int unsubscribe_session_consumed_size_rotation(struct ltt_session *session,
121 struct notification_thread_handle *notification_thread_handle)
122 {
123 int ret = 0;
124 enum lttng_notification_channel_status status;
125
126 status = lttng_notification_channel_unsubscribe(
127 rotate_notification_channel,
128 session->rotate_condition);
129 if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) {
130 ERR("Session unsubscribe error: %d", (int) status);
131 ret = -1;
132 goto end;
133 }
134
135 ret = notification_thread_command_unregister_trigger(
136 notification_thread_handle, session->rotate_trigger);
137 if (ret != LTTNG_OK) {
138 ERR("Session unregister trigger error: %d", ret);
139 goto end;
140 }
141
142 ret = 0;
143 end:
144 return ret;
145 }
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