Commit | Line | Data |
---|---|---|
ab0ee2ca JG |
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 | #include <lttng/trigger/trigger.h> | |
19 | #include <lttng/lttng-error.h> | |
20 | #include "notification-thread.h" | |
21 | #include "notification-thread-commands.h" | |
22 | #include <common/error.h> | |
23 | #include <common/futex.h> | |
24 | #include <unistd.h> | |
25 | #include <stdint.h> | |
26 | #include <inttypes.h> | |
27 | ||
28 | static | |
29 | void init_notification_thread_command(struct notification_thread_command *cmd) | |
30 | { | |
31 | memset(cmd, 0, sizeof(*cmd)); | |
32 | CDS_INIT_LIST_HEAD(&cmd->cmd_list_node); | |
33 | } | |
34 | ||
35 | static | |
36 | int run_command_wait(struct notification_thread_handle *handle, | |
37 | struct notification_thread_command *cmd) | |
38 | { | |
39 | int ret; | |
40 | uint64_t notification_counter = 1; | |
41 | ||
42 | futex_nto1_prepare(&cmd->reply_futex); | |
43 | ||
44 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
45 | /* Add to queue. */ | |
46 | cds_list_add_tail(&cmd->cmd_list_node, | |
47 | &handle->cmd_queue.list); | |
48 | /* Wake-up thread. */ | |
49 | ret = write(handle->cmd_queue.event_fd, | |
50 | ¬ification_counter, sizeof(notification_counter)); | |
51 | if (ret < 0) { | |
52 | PERROR("write to notification thread's queue event fd"); | |
53 | /* | |
54 | * Remove the command from the list so the notification | |
55 | * thread does not process it. | |
56 | */ | |
57 | cds_list_del(&cmd->cmd_list_node); | |
58 | goto error_unlock_queue; | |
59 | } | |
60 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
61 | ||
62 | futex_nto1_wait(&cmd->reply_futex); | |
63 | return 0; | |
64 | error_unlock_queue: | |
65 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
66 | return -1; | |
67 | } | |
68 | ||
69 | enum lttng_error_code notification_thread_command_register_trigger( | |
70 | struct notification_thread_handle *handle, | |
71 | struct lttng_trigger *trigger) | |
72 | { | |
73 | int ret; | |
74 | enum lttng_error_code ret_code; | |
75 | struct notification_thread_command cmd; | |
76 | ||
77 | init_notification_thread_command(&cmd); | |
78 | ||
79 | cmd.type = NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER; | |
80 | cmd.parameters.trigger = trigger; | |
81 | ||
82 | ret = run_command_wait(handle, &cmd); | |
83 | if (ret) { | |
84 | ret_code = LTTNG_ERR_UNK; | |
85 | goto end; | |
86 | } | |
87 | ret_code = cmd.reply_code; | |
88 | end: | |
89 | return ret_code; | |
90 | } | |
91 | ||
92 | enum lttng_error_code notification_thread_command_unregister_trigger( | |
93 | struct notification_thread_handle *handle, | |
94 | struct lttng_trigger *trigger) | |
95 | { | |
96 | int ret; | |
97 | enum lttng_error_code ret_code; | |
98 | struct notification_thread_command cmd; | |
99 | ||
100 | init_notification_thread_command(&cmd); | |
101 | ||
102 | cmd.type = NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER; | |
103 | cmd.parameters.trigger = trigger; | |
104 | ||
105 | ret = run_command_wait(handle, &cmd); | |
106 | if (ret) { | |
107 | ret_code = LTTNG_ERR_UNK; | |
108 | goto end; | |
109 | } | |
110 | ret_code = cmd.reply_code; | |
111 | end: | |
112 | return ret_code; | |
113 | } | |
114 | ||
115 | enum lttng_error_code notification_thread_command_add_channel( | |
116 | struct notification_thread_handle *handle, | |
117 | char *session_name, uid_t uid, gid_t gid, | |
118 | char *channel_name, uint64_t key, | |
119 | enum lttng_domain_type domain, uint64_t capacity) | |
120 | { | |
121 | int ret; | |
122 | enum lttng_error_code ret_code; | |
123 | struct notification_thread_command cmd; | |
124 | ||
125 | init_notification_thread_command(&cmd); | |
126 | ||
127 | cmd.type = NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL; | |
128 | cmd.parameters.add_channel.session_name = session_name; | |
129 | cmd.parameters.add_channel.uid = uid; | |
130 | cmd.parameters.add_channel.gid = gid; | |
131 | cmd.parameters.add_channel.channel_name = channel_name; | |
132 | cmd.parameters.add_channel.key.key = key; | |
133 | cmd.parameters.add_channel.key.domain = domain; | |
134 | cmd.parameters.add_channel.capacity = capacity; | |
135 | ||
136 | ret = run_command_wait(handle, &cmd); | |
137 | if (ret) { | |
138 | ret_code = LTTNG_ERR_UNK; | |
139 | goto end; | |
140 | } | |
141 | ret_code = cmd.reply_code; | |
142 | end: | |
143 | return ret_code; | |
144 | } | |
145 | ||
146 | enum lttng_error_code notification_thread_command_remove_channel( | |
147 | struct notification_thread_handle *handle, | |
148 | uint64_t key, enum lttng_domain_type domain) | |
149 | { | |
150 | int ret; | |
151 | enum lttng_error_code ret_code; | |
152 | struct notification_thread_command cmd; | |
153 | ||
154 | init_notification_thread_command(&cmd); | |
155 | ||
156 | cmd.type = NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL; | |
157 | cmd.parameters.remove_channel.key = key; | |
158 | cmd.parameters.remove_channel.domain = domain; | |
159 | ||
160 | ret = run_command_wait(handle, &cmd); | |
161 | if (ret) { | |
162 | ret_code = LTTNG_ERR_UNK; | |
163 | goto end; | |
164 | } | |
165 | ret_code = cmd.reply_code; | |
166 | end: | |
167 | return ret_code; | |
168 | } | |
169 | ||
170 | void notification_thread_command_quit( | |
171 | struct notification_thread_handle *handle) | |
172 | { | |
173 | int ret; | |
174 | struct notification_thread_command cmd; | |
175 | ||
176 | init_notification_thread_command(&cmd); | |
177 | ||
178 | cmd.type = NOTIFICATION_COMMAND_TYPE_QUIT; | |
179 | ret = run_command_wait(handle, &cmd); | |
180 | assert(!ret && cmd.reply_code == LTTNG_OK); | |
181 | } |