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d0b96690 DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@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 | */ | |
890d8fe4 | 17 | |
6c1c0768 | 18 | #define _LGPL_SOURCE |
d0b96690 DG |
19 | #include <assert.h> |
20 | ||
21 | #include <common/common.h> | |
22 | #include <common/utils.h> | |
23 | ||
24 | #include "fd-limit.h" | |
25 | #include "lttng-sessiond.h" | |
26 | #include "ust-thread.h" | |
8782cc74 | 27 | #include "health-sessiond.h" |
9ad42ec1 | 28 | #include "testpoint.h" |
971a61c6 JG |
29 | #include "utils.h" |
30 | #include "thread.h" | |
31 | ||
32 | struct thread_notifiers { | |
33 | struct lttng_pipe *quit_pipe; | |
34 | int apps_cmd_notify_pipe_read_fd; | |
35 | }; | |
d0b96690 DG |
36 | |
37 | /* | |
38 | * This thread manage application notify communication. | |
39 | */ | |
971a61c6 | 40 | static void *thread_application_notification(void *data) |
d0b96690 | 41 | { |
380e8d6f | 42 | int i, ret, pollfd, err = -1; |
6cd525e8 | 43 | ssize_t size_ret; |
d0b96690 DG |
44 | uint32_t revents, nb_fd; |
45 | struct lttng_poll_event events; | |
971a61c6 JG |
46 | struct thread_notifiers *notifiers = data; |
47 | const int quit_pipe_read_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); | |
d0b96690 DG |
48 | |
49 | DBG("[ust-thread] Manage application notify command"); | |
50 | ||
51 | rcu_register_thread(); | |
52 | rcu_thread_online(); | |
53 | ||
6c71277b MD |
54 | health_register(health_sessiond, |
55 | HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY); | |
380e8d6f | 56 | |
9ad42ec1 MD |
57 | if (testpoint(sessiond_thread_app_manage_notify)) { |
58 | goto error_testpoint; | |
59 | } | |
60 | ||
380e8d6f MD |
61 | health_code_update(); |
62 | ||
971a61c6 | 63 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); |
d0b96690 DG |
64 | if (ret < 0) { |
65 | goto error_poll_create; | |
66 | } | |
67 | ||
68 | /* Add notify pipe to the pollset. */ | |
971a61c6 | 69 | ret = lttng_poll_add(&events, notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 | 70 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
d0b96690 DG |
71 | if (ret < 0) { |
72 | goto error; | |
73 | } | |
74 | ||
971a61c6 JG |
75 | ret = lttng_poll_add(&events, quit_pipe_read_fd, |
76 | LPOLLIN | LPOLLERR); | |
77 | if (ret < 0) { | |
78 | goto error; | |
79 | } | |
80 | ||
380e8d6f MD |
81 | health_code_update(); |
82 | ||
d0b96690 | 83 | while (1) { |
7fa2082e | 84 | DBG3("[ust-thread] Manage notify polling"); |
d0b96690 DG |
85 | |
86 | /* Inifinite blocking call, waiting for transmission */ | |
87 | restart: | |
380e8d6f | 88 | health_poll_entry(); |
d0b96690 | 89 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
90 | DBG3("[ust-thread] Manage notify return from poll on %d fds", |
91 | LTTNG_POLL_GETNB(&events)); | |
380e8d6f | 92 | health_poll_exit(); |
d0b96690 DG |
93 | if (ret < 0) { |
94 | /* | |
95 | * Restart interrupted system call. | |
96 | */ | |
97 | if (errno == EINTR) { | |
98 | goto restart; | |
99 | } | |
100 | goto error; | |
101 | } | |
102 | ||
103 | nb_fd = ret; | |
104 | ||
105 | for (i = 0; i < nb_fd; i++) { | |
380e8d6f MD |
106 | health_code_update(); |
107 | ||
d0b96690 DG |
108 | /* Fetch once the poll data */ |
109 | revents = LTTNG_POLL_GETEV(&events, i); | |
110 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
111 | ||
fd20dac9 MD |
112 | if (!revents) { |
113 | /* No activity for this FD (poll implementation). */ | |
114 | continue; | |
115 | } | |
116 | ||
d0b96690 | 117 | /* Thread quit pipe has been closed. Killing thread. */ |
971a61c6 | 118 | if (pollfd == quit_pipe_read_fd) { |
380e8d6f | 119 | err = 0; |
d0b96690 | 120 | goto exit; |
971a61c6 JG |
121 | } else if (pollfd == notifiers->apps_cmd_notify_pipe_read_fd) { |
122 | /* Inspect the apps cmd pipe */ | |
d0b96690 DG |
123 | int sock; |
124 | ||
03e43155 MD |
125 | if (revents & LPOLLIN) { |
126 | /* Get socket from dispatch thread. */ | |
971a61c6 | 127 | size_ret = lttng_read(notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 MD |
128 | &sock, sizeof(sock)); |
129 | if (size_ret < sizeof(sock)) { | |
130 | PERROR("read apps notify pipe"); | |
131 | goto error; | |
132 | } | |
133 | health_code_update(); | |
134 | ||
135 | ret = lttng_poll_add(&events, sock, | |
136 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
137 | if (ret < 0) { | |
138 | /* | |
139 | * It's possible we've reached the max poll fd allowed. | |
140 | * Let's close the socket but continue normal execution. | |
141 | */ | |
142 | ret = close(sock); | |
143 | if (ret) { | |
144 | PERROR("close notify socket %d", sock); | |
145 | } | |
146 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
147 | continue; | |
148 | } | |
149 | DBG3("UST thread notify added sock %d to pollset", sock); | |
150 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
151 | ERR("Apps notify command pipe error"); |
152 | goto error; | |
03e43155 MD |
153 | } else { |
154 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
d0b96690 DG |
155 | goto error; |
156 | } | |
d0b96690 DG |
157 | } else { |
158 | /* | |
159 | * At this point, we know that a registered application | |
160 | * triggered the event. | |
161 | */ | |
03e43155 MD |
162 | if (revents & (LPOLLIN | LPOLLPRI)) { |
163 | ret = ust_app_recv_notify(pollfd); | |
164 | if (ret < 0) { | |
165 | /* Removing from the poll set */ | |
166 | ret = lttng_poll_del(&events, pollfd); | |
167 | if (ret < 0) { | |
168 | goto error; | |
169 | } | |
170 | ||
171 | /* The socket is closed after a grace period here. */ | |
172 | ust_app_notify_sock_unregister(pollfd); | |
173 | } | |
174 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
175 | /* Removing from the poll set */ |
176 | ret = lttng_poll_del(&events, pollfd); | |
177 | if (ret < 0) { | |
178 | goto error; | |
179 | } | |
180 | ||
d88aee68 DG |
181 | /* The socket is closed after a grace period here. */ |
182 | ust_app_notify_sock_unregister(pollfd); | |
d0b96690 | 183 | } else { |
03e43155 MD |
184 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
185 | goto error; | |
d0b96690 | 186 | } |
380e8d6f | 187 | health_code_update(); |
d0b96690 DG |
188 | } |
189 | } | |
190 | } | |
191 | ||
192 | exit: | |
193 | error: | |
194 | lttng_poll_clean(&events); | |
195 | error_poll_create: | |
9ad42ec1 | 196 | error_testpoint: |
971a61c6 | 197 | |
d0b96690 | 198 | DBG("Application notify communication apps thread cleanup complete"); |
380e8d6f MD |
199 | if (err) { |
200 | health_error(); | |
201 | ERR("Health error occurred in %s", __func__); | |
202 | } | |
8782cc74 | 203 | health_unregister(health_sessiond); |
d0b96690 DG |
204 | rcu_thread_offline(); |
205 | rcu_unregister_thread(); | |
206 | return NULL; | |
207 | } | |
971a61c6 JG |
208 | |
209 | static bool shutdown_application_notification_thread(void *data) | |
210 | { | |
211 | struct thread_notifiers *notifiers = data; | |
212 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); | |
213 | ||
214 | return notify_thread_pipe(write_fd) == 1; | |
215 | } | |
216 | ||
217 | static void cleanup_application_notification_thread(void *data) | |
218 | { | |
219 | struct thread_notifiers *notifiers = data; | |
220 | ||
221 | lttng_pipe_destroy(notifiers->quit_pipe); | |
222 | free(notifiers); | |
223 | } | |
224 | ||
225 | bool launch_application_notification_thread(int apps_cmd_notify_pipe_read_fd) | |
226 | { | |
227 | struct lttng_thread *thread; | |
228 | struct thread_notifiers *notifiers; | |
229 | struct lttng_pipe *quit_pipe; | |
230 | ||
231 | notifiers = zmalloc(sizeof(*notifiers)); | |
232 | if (!notifiers) { | |
233 | goto error; | |
234 | } | |
235 | notifiers->apps_cmd_notify_pipe_read_fd = apps_cmd_notify_pipe_read_fd; | |
236 | ||
237 | quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
238 | if (!quit_pipe) { | |
239 | goto error; | |
240 | } | |
241 | notifiers->quit_pipe = quit_pipe; | |
242 | ||
243 | thread = lttng_thread_create("Application notification", | |
244 | thread_application_notification, | |
245 | shutdown_application_notification_thread, | |
246 | cleanup_application_notification_thread, | |
247 | notifiers); | |
248 | if (!thread) { | |
249 | goto error; | |
250 | } | |
251 | lttng_thread_put(thread); | |
252 | return true; | |
253 | error: | |
254 | cleanup_application_notification_thread(notifiers); | |
255 | return false; | |
256 | } |