Commit | Line | Data |
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d0b96690 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
d0b96690 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
d0b96690 | 5 | * |
d0b96690 | 6 | */ |
890d8fe4 | 7 | |
6c1c0768 | 8 | #define _LGPL_SOURCE |
d0b96690 | 9 | |
c9e313bc SM |
10 | #include <common/common.hpp> |
11 | #include <common/utils.hpp> | |
d0b96690 | 12 | |
c9e313bc SM |
13 | #include "fd-limit.hpp" |
14 | #include "lttng-sessiond.hpp" | |
15 | #include "notify-apps.hpp" | |
16 | #include "health-sessiond.hpp" | |
17 | #include "testpoint.hpp" | |
18 | #include "utils.hpp" | |
19 | #include "thread.hpp" | |
971a61c6 | 20 | |
f1494934 | 21 | namespace { |
971a61c6 JG |
22 | struct thread_notifiers { |
23 | struct lttng_pipe *quit_pipe; | |
24 | int apps_cmd_notify_pipe_read_fd; | |
25 | }; | |
f1494934 | 26 | } /* namespace */ |
d0b96690 DG |
27 | |
28 | /* | |
29 | * This thread manage application notify communication. | |
30 | */ | |
971a61c6 | 31 | static void *thread_application_notification(void *data) |
d0b96690 | 32 | { |
380e8d6f | 33 | int i, ret, pollfd, err = -1; |
6cd525e8 | 34 | ssize_t size_ret; |
d0b96690 DG |
35 | uint32_t revents, nb_fd; |
36 | struct lttng_poll_event events; | |
7966af57 | 37 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 | 38 | const int quit_pipe_read_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); |
d0b96690 DG |
39 | |
40 | DBG("[ust-thread] Manage application notify command"); | |
41 | ||
42 | rcu_register_thread(); | |
43 | rcu_thread_online(); | |
44 | ||
412d7227 SM |
45 | health_register(the_health_sessiond, |
46 | HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY); | |
380e8d6f | 47 | |
9ad42ec1 MD |
48 | if (testpoint(sessiond_thread_app_manage_notify)) { |
49 | goto error_testpoint; | |
50 | } | |
51 | ||
380e8d6f MD |
52 | health_code_update(); |
53 | ||
971a61c6 | 54 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); |
d0b96690 DG |
55 | if (ret < 0) { |
56 | goto error_poll_create; | |
57 | } | |
58 | ||
59 | /* Add notify pipe to the pollset. */ | |
971a61c6 | 60 | ret = lttng_poll_add(&events, notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 | 61 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
d0b96690 DG |
62 | if (ret < 0) { |
63 | goto error; | |
64 | } | |
65 | ||
971a61c6 JG |
66 | ret = lttng_poll_add(&events, quit_pipe_read_fd, |
67 | LPOLLIN | LPOLLERR); | |
68 | if (ret < 0) { | |
69 | goto error; | |
70 | } | |
71 | ||
380e8d6f MD |
72 | health_code_update(); |
73 | ||
d0b96690 | 74 | while (1) { |
7fa2082e | 75 | DBG3("[ust-thread] Manage notify polling"); |
d0b96690 DG |
76 | |
77 | /* Inifinite blocking call, waiting for transmission */ | |
78 | restart: | |
380e8d6f | 79 | health_poll_entry(); |
d0b96690 | 80 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
81 | DBG3("[ust-thread] Manage notify return from poll on %d fds", |
82 | LTTNG_POLL_GETNB(&events)); | |
380e8d6f | 83 | health_poll_exit(); |
d0b96690 DG |
84 | if (ret < 0) { |
85 | /* | |
86 | * Restart interrupted system call. | |
87 | */ | |
88 | if (errno == EINTR) { | |
89 | goto restart; | |
90 | } | |
91 | goto error; | |
92 | } | |
93 | ||
94 | nb_fd = ret; | |
95 | ||
96 | for (i = 0; i < nb_fd; i++) { | |
380e8d6f MD |
97 | health_code_update(); |
98 | ||
d0b96690 DG |
99 | /* Fetch once the poll data */ |
100 | revents = LTTNG_POLL_GETEV(&events, i); | |
101 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
102 | ||
103 | /* Thread quit pipe has been closed. Killing thread. */ | |
971a61c6 | 104 | if (pollfd == quit_pipe_read_fd) { |
380e8d6f | 105 | err = 0; |
d0b96690 | 106 | goto exit; |
971a61c6 JG |
107 | } else if (pollfd == notifiers->apps_cmd_notify_pipe_read_fd) { |
108 | /* Inspect the apps cmd pipe */ | |
d0b96690 DG |
109 | int sock; |
110 | ||
03e43155 MD |
111 | if (revents & LPOLLIN) { |
112 | /* Get socket from dispatch thread. */ | |
971a61c6 | 113 | size_ret = lttng_read(notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 MD |
114 | &sock, sizeof(sock)); |
115 | if (size_ret < sizeof(sock)) { | |
116 | PERROR("read apps notify pipe"); | |
117 | goto error; | |
118 | } | |
119 | health_code_update(); | |
120 | ||
121 | ret = lttng_poll_add(&events, sock, | |
122 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
123 | if (ret < 0) { | |
124 | /* | |
125 | * It's possible we've reached the max poll fd allowed. | |
126 | * Let's close the socket but continue normal execution. | |
127 | */ | |
128 | ret = close(sock); | |
129 | if (ret) { | |
130 | PERROR("close notify socket %d", sock); | |
131 | } | |
132 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
133 | continue; | |
134 | } | |
135 | DBG3("UST thread notify added sock %d to pollset", sock); | |
136 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
137 | ERR("Apps notify command pipe error"); |
138 | goto error; | |
03e43155 MD |
139 | } else { |
140 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
d0b96690 DG |
141 | goto error; |
142 | } | |
d0b96690 DG |
143 | } else { |
144 | /* | |
145 | * At this point, we know that a registered application | |
146 | * triggered the event. | |
147 | */ | |
03e43155 MD |
148 | if (revents & (LPOLLIN | LPOLLPRI)) { |
149 | ret = ust_app_recv_notify(pollfd); | |
150 | if (ret < 0) { | |
151 | /* Removing from the poll set */ | |
152 | ret = lttng_poll_del(&events, pollfd); | |
153 | if (ret < 0) { | |
154 | goto error; | |
155 | } | |
156 | ||
157 | /* The socket is closed after a grace period here. */ | |
158 | ust_app_notify_sock_unregister(pollfd); | |
159 | } | |
160 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
161 | /* Removing from the poll set */ |
162 | ret = lttng_poll_del(&events, pollfd); | |
163 | if (ret < 0) { | |
164 | goto error; | |
165 | } | |
166 | ||
d88aee68 DG |
167 | /* The socket is closed after a grace period here. */ |
168 | ust_app_notify_sock_unregister(pollfd); | |
d0b96690 | 169 | } else { |
03e43155 MD |
170 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
171 | goto error; | |
d0b96690 | 172 | } |
380e8d6f | 173 | health_code_update(); |
d0b96690 DG |
174 | } |
175 | } | |
176 | } | |
177 | ||
178 | exit: | |
179 | error: | |
180 | lttng_poll_clean(&events); | |
181 | error_poll_create: | |
9ad42ec1 | 182 | error_testpoint: |
971a61c6 | 183 | |
d0b96690 | 184 | DBG("Application notify communication apps thread cleanup complete"); |
380e8d6f MD |
185 | if (err) { |
186 | health_error(); | |
187 | ERR("Health error occurred in %s", __func__); | |
188 | } | |
412d7227 | 189 | health_unregister(the_health_sessiond); |
d0b96690 DG |
190 | rcu_thread_offline(); |
191 | rcu_unregister_thread(); | |
192 | return NULL; | |
193 | } | |
971a61c6 JG |
194 | |
195 | static bool shutdown_application_notification_thread(void *data) | |
196 | { | |
7966af57 | 197 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 JG |
198 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); |
199 | ||
200 | return notify_thread_pipe(write_fd) == 1; | |
201 | } | |
202 | ||
203 | static void cleanup_application_notification_thread(void *data) | |
204 | { | |
7966af57 | 205 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 JG |
206 | |
207 | lttng_pipe_destroy(notifiers->quit_pipe); | |
208 | free(notifiers); | |
209 | } | |
210 | ||
211 | bool launch_application_notification_thread(int apps_cmd_notify_pipe_read_fd) | |
212 | { | |
213 | struct lttng_thread *thread; | |
214 | struct thread_notifiers *notifiers; | |
215 | struct lttng_pipe *quit_pipe; | |
216 | ||
64803277 | 217 | notifiers = zmalloc<thread_notifiers>(); |
971a61c6 | 218 | if (!notifiers) { |
21fa020e | 219 | goto error_alloc; |
971a61c6 JG |
220 | } |
221 | notifiers->apps_cmd_notify_pipe_read_fd = apps_cmd_notify_pipe_read_fd; | |
222 | ||
223 | quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
224 | if (!quit_pipe) { | |
225 | goto error; | |
226 | } | |
227 | notifiers->quit_pipe = quit_pipe; | |
228 | ||
229 | thread = lttng_thread_create("Application notification", | |
230 | thread_application_notification, | |
231 | shutdown_application_notification_thread, | |
232 | cleanup_application_notification_thread, | |
233 | notifiers); | |
234 | if (!thread) { | |
235 | goto error; | |
236 | } | |
237 | lttng_thread_put(thread); | |
238 | return true; | |
239 | error: | |
240 | cleanup_application_notification_thread(notifiers); | |
21fa020e | 241 | error_alloc: |
971a61c6 JG |
242 | return false; |
243 | } |