Commit | Line | Data |
---|---|---|
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 DG |
9 | |
10 | #include <common/common.h> | |
11 | #include <common/utils.h> | |
12 | ||
13 | #include "fd-limit.h" | |
14 | #include "lttng-sessiond.h" | |
f9d2ba6a | 15 | #include "notify-apps.h" |
8782cc74 | 16 | #include "health-sessiond.h" |
9ad42ec1 | 17 | #include "testpoint.h" |
971a61c6 JG |
18 | #include "utils.h" |
19 | #include "thread.h" | |
20 | ||
21 | struct thread_notifiers { | |
22 | struct lttng_pipe *quit_pipe; | |
23 | int apps_cmd_notify_pipe_read_fd; | |
24 | }; | |
d0b96690 DG |
25 | |
26 | /* | |
27 | * This thread manage application notify communication. | |
28 | */ | |
971a61c6 | 29 | static void *thread_application_notification(void *data) |
d0b96690 | 30 | { |
380e8d6f | 31 | int i, ret, pollfd, err = -1; |
6cd525e8 | 32 | ssize_t size_ret; |
d0b96690 DG |
33 | uint32_t revents, nb_fd; |
34 | struct lttng_poll_event events; | |
7966af57 | 35 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 | 36 | const int quit_pipe_read_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); |
d0b96690 DG |
37 | |
38 | DBG("[ust-thread] Manage application notify command"); | |
39 | ||
40 | rcu_register_thread(); | |
41 | rcu_thread_online(); | |
42 | ||
412d7227 SM |
43 | health_register(the_health_sessiond, |
44 | HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY); | |
380e8d6f | 45 | |
9ad42ec1 MD |
46 | if (testpoint(sessiond_thread_app_manage_notify)) { |
47 | goto error_testpoint; | |
48 | } | |
49 | ||
380e8d6f MD |
50 | health_code_update(); |
51 | ||
971a61c6 | 52 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); |
d0b96690 DG |
53 | if (ret < 0) { |
54 | goto error_poll_create; | |
55 | } | |
56 | ||
57 | /* Add notify pipe to the pollset. */ | |
971a61c6 | 58 | ret = lttng_poll_add(&events, notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 | 59 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
d0b96690 DG |
60 | if (ret < 0) { |
61 | goto error; | |
62 | } | |
63 | ||
971a61c6 JG |
64 | ret = lttng_poll_add(&events, quit_pipe_read_fd, |
65 | LPOLLIN | LPOLLERR); | |
66 | if (ret < 0) { | |
67 | goto error; | |
68 | } | |
69 | ||
380e8d6f MD |
70 | health_code_update(); |
71 | ||
d0b96690 | 72 | while (1) { |
7fa2082e | 73 | DBG3("[ust-thread] Manage notify polling"); |
d0b96690 DG |
74 | |
75 | /* Inifinite blocking call, waiting for transmission */ | |
76 | restart: | |
380e8d6f | 77 | health_poll_entry(); |
d0b96690 | 78 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
79 | DBG3("[ust-thread] Manage notify return from poll on %d fds", |
80 | LTTNG_POLL_GETNB(&events)); | |
380e8d6f | 81 | health_poll_exit(); |
d0b96690 DG |
82 | if (ret < 0) { |
83 | /* | |
84 | * Restart interrupted system call. | |
85 | */ | |
86 | if (errno == EINTR) { | |
87 | goto restart; | |
88 | } | |
89 | goto error; | |
90 | } | |
91 | ||
92 | nb_fd = ret; | |
93 | ||
94 | for (i = 0; i < nb_fd; i++) { | |
380e8d6f MD |
95 | health_code_update(); |
96 | ||
d0b96690 DG |
97 | /* Fetch once the poll data */ |
98 | revents = LTTNG_POLL_GETEV(&events, i); | |
99 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
100 | ||
101 | /* Thread quit pipe has been closed. Killing thread. */ | |
971a61c6 | 102 | if (pollfd == quit_pipe_read_fd) { |
380e8d6f | 103 | err = 0; |
d0b96690 | 104 | goto exit; |
971a61c6 JG |
105 | } else if (pollfd == notifiers->apps_cmd_notify_pipe_read_fd) { |
106 | /* Inspect the apps cmd pipe */ | |
d0b96690 DG |
107 | int sock; |
108 | ||
03e43155 MD |
109 | if (revents & LPOLLIN) { |
110 | /* Get socket from dispatch thread. */ | |
971a61c6 | 111 | size_ret = lttng_read(notifiers->apps_cmd_notify_pipe_read_fd, |
03e43155 MD |
112 | &sock, sizeof(sock)); |
113 | if (size_ret < sizeof(sock)) { | |
114 | PERROR("read apps notify pipe"); | |
115 | goto error; | |
116 | } | |
117 | health_code_update(); | |
118 | ||
119 | ret = lttng_poll_add(&events, sock, | |
120 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
121 | if (ret < 0) { | |
122 | /* | |
123 | * It's possible we've reached the max poll fd allowed. | |
124 | * Let's close the socket but continue normal execution. | |
125 | */ | |
126 | ret = close(sock); | |
127 | if (ret) { | |
128 | PERROR("close notify socket %d", sock); | |
129 | } | |
130 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
131 | continue; | |
132 | } | |
133 | DBG3("UST thread notify added sock %d to pollset", sock); | |
134 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
135 | ERR("Apps notify command pipe error"); |
136 | goto error; | |
03e43155 MD |
137 | } else { |
138 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
d0b96690 DG |
139 | goto error; |
140 | } | |
d0b96690 DG |
141 | } else { |
142 | /* | |
143 | * At this point, we know that a registered application | |
144 | * triggered the event. | |
145 | */ | |
03e43155 MD |
146 | if (revents & (LPOLLIN | LPOLLPRI)) { |
147 | ret = ust_app_recv_notify(pollfd); | |
148 | if (ret < 0) { | |
149 | /* Removing from the poll set */ | |
150 | ret = lttng_poll_del(&events, pollfd); | |
151 | if (ret < 0) { | |
152 | goto error; | |
153 | } | |
154 | ||
155 | /* The socket is closed after a grace period here. */ | |
156 | ust_app_notify_sock_unregister(pollfd); | |
157 | } | |
158 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
159 | /* Removing from the poll set */ |
160 | ret = lttng_poll_del(&events, pollfd); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | ||
d88aee68 DG |
165 | /* The socket is closed after a grace period here. */ |
166 | ust_app_notify_sock_unregister(pollfd); | |
d0b96690 | 167 | } else { |
03e43155 MD |
168 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
169 | goto error; | |
d0b96690 | 170 | } |
380e8d6f | 171 | health_code_update(); |
d0b96690 DG |
172 | } |
173 | } | |
174 | } | |
175 | ||
176 | exit: | |
177 | error: | |
178 | lttng_poll_clean(&events); | |
179 | error_poll_create: | |
9ad42ec1 | 180 | error_testpoint: |
971a61c6 | 181 | |
d0b96690 | 182 | DBG("Application notify communication apps thread cleanup complete"); |
380e8d6f MD |
183 | if (err) { |
184 | health_error(); | |
185 | ERR("Health error occurred in %s", __func__); | |
186 | } | |
412d7227 | 187 | health_unregister(the_health_sessiond); |
d0b96690 DG |
188 | rcu_thread_offline(); |
189 | rcu_unregister_thread(); | |
190 | return NULL; | |
191 | } | |
971a61c6 JG |
192 | |
193 | static bool shutdown_application_notification_thread(void *data) | |
194 | { | |
7966af57 | 195 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 JG |
196 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); |
197 | ||
198 | return notify_thread_pipe(write_fd) == 1; | |
199 | } | |
200 | ||
201 | static void cleanup_application_notification_thread(void *data) | |
202 | { | |
7966af57 | 203 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
971a61c6 JG |
204 | |
205 | lttng_pipe_destroy(notifiers->quit_pipe); | |
206 | free(notifiers); | |
207 | } | |
208 | ||
209 | bool launch_application_notification_thread(int apps_cmd_notify_pipe_read_fd) | |
210 | { | |
211 | struct lttng_thread *thread; | |
212 | struct thread_notifiers *notifiers; | |
213 | struct lttng_pipe *quit_pipe; | |
214 | ||
7966af57 | 215 | notifiers = (thread_notifiers *) zmalloc(sizeof(*notifiers)); |
971a61c6 | 216 | if (!notifiers) { |
21fa020e | 217 | goto error_alloc; |
971a61c6 JG |
218 | } |
219 | notifiers->apps_cmd_notify_pipe_read_fd = apps_cmd_notify_pipe_read_fd; | |
220 | ||
221 | quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
222 | if (!quit_pipe) { | |
223 | goto error; | |
224 | } | |
225 | notifiers->quit_pipe = quit_pipe; | |
226 | ||
227 | thread = lttng_thread_create("Application notification", | |
228 | thread_application_notification, | |
229 | shutdown_application_notification_thread, | |
230 | cleanup_application_notification_thread, | |
231 | notifiers); | |
232 | if (!thread) { | |
233 | goto error; | |
234 | } | |
235 | lttng_thread_put(thread); | |
236 | return true; | |
237 | error: | |
238 | cleanup_application_notification_thread(notifiers); | |
21fa020e | 239 | error_alloc: |
971a61c6 JG |
240 | return false; |
241 | } |