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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" |
d0b96690 DG |
29 | |
30 | /* | |
31 | * This thread manage application notify communication. | |
32 | */ | |
33 | void *ust_thread_manage_notify(void *data) | |
34 | { | |
380e8d6f | 35 | int i, ret, pollfd, err = -1; |
6cd525e8 | 36 | ssize_t size_ret; |
d0b96690 DG |
37 | uint32_t revents, nb_fd; |
38 | struct lttng_poll_event events; | |
39 | ||
40 | DBG("[ust-thread] Manage application notify command"); | |
41 | ||
42 | rcu_register_thread(); | |
43 | rcu_thread_online(); | |
44 | ||
6c71277b MD |
45 | health_register(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 | ||
d0b96690 DG |
54 | ret = sessiond_set_thread_pollset(&events, 2); |
55 | if (ret < 0) { | |
56 | goto error_poll_create; | |
57 | } | |
58 | ||
59 | /* Add notify pipe to the pollset. */ | |
03e43155 MD |
60 | ret = lttng_poll_add(&events, apps_cmd_notify_pipe[0], |
61 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
d0b96690 DG |
62 | if (ret < 0) { |
63 | goto error; | |
64 | } | |
65 | ||
380e8d6f MD |
66 | health_code_update(); |
67 | ||
d0b96690 | 68 | while (1) { |
7fa2082e | 69 | DBG3("[ust-thread] Manage notify polling"); |
d0b96690 DG |
70 | |
71 | /* Inifinite blocking call, waiting for transmission */ | |
72 | restart: | |
380e8d6f | 73 | health_poll_entry(); |
d0b96690 | 74 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
75 | DBG3("[ust-thread] Manage notify return from poll on %d fds", |
76 | LTTNG_POLL_GETNB(&events)); | |
380e8d6f | 77 | health_poll_exit(); |
d0b96690 DG |
78 | if (ret < 0) { |
79 | /* | |
80 | * Restart interrupted system call. | |
81 | */ | |
82 | if (errno == EINTR) { | |
83 | goto restart; | |
84 | } | |
85 | goto error; | |
86 | } | |
87 | ||
88 | nb_fd = ret; | |
89 | ||
90 | for (i = 0; i < nb_fd; i++) { | |
380e8d6f MD |
91 | health_code_update(); |
92 | ||
d0b96690 DG |
93 | /* Fetch once the poll data */ |
94 | revents = LTTNG_POLL_GETEV(&events, i); | |
95 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
96 | ||
fd20dac9 MD |
97 | if (!revents) { |
98 | /* No activity for this FD (poll implementation). */ | |
99 | continue; | |
100 | } | |
101 | ||
d0b96690 DG |
102 | /* Thread quit pipe has been closed. Killing thread. */ |
103 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
104 | if (ret) { | |
380e8d6f | 105 | err = 0; |
d0b96690 DG |
106 | goto exit; |
107 | } | |
108 | ||
109 | /* Inspect the apps cmd pipe */ | |
110 | if (pollfd == apps_cmd_notify_pipe[0]) { | |
111 | int sock; | |
112 | ||
03e43155 MD |
113 | if (revents & LPOLLIN) { |
114 | /* Get socket from dispatch thread. */ | |
115 | size_ret = lttng_read(apps_cmd_notify_pipe[0], | |
116 | &sock, sizeof(sock)); | |
117 | if (size_ret < sizeof(sock)) { | |
118 | PERROR("read apps notify pipe"); | |
119 | goto error; | |
120 | } | |
121 | health_code_update(); | |
122 | ||
123 | ret = lttng_poll_add(&events, sock, | |
124 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
125 | if (ret < 0) { | |
126 | /* | |
127 | * It's possible we've reached the max poll fd allowed. | |
128 | * Let's close the socket but continue normal execution. | |
129 | */ | |
130 | ret = close(sock); | |
131 | if (ret) { | |
132 | PERROR("close notify socket %d", sock); | |
133 | } | |
134 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
135 | continue; | |
136 | } | |
137 | DBG3("UST thread notify added sock %d to pollset", sock); | |
138 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
139 | ERR("Apps notify command pipe error"); |
140 | goto error; | |
03e43155 MD |
141 | } else { |
142 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
d0b96690 DG |
143 | goto error; |
144 | } | |
d0b96690 DG |
145 | } else { |
146 | /* | |
147 | * At this point, we know that a registered application | |
148 | * triggered the event. | |
149 | */ | |
03e43155 MD |
150 | if (revents & (LPOLLIN | LPOLLPRI)) { |
151 | ret = ust_app_recv_notify(pollfd); | |
152 | if (ret < 0) { | |
153 | /* Removing from the poll set */ | |
154 | ret = lttng_poll_del(&events, pollfd); | |
155 | if (ret < 0) { | |
156 | goto error; | |
157 | } | |
158 | ||
159 | /* The socket is closed after a grace period here. */ | |
160 | ust_app_notify_sock_unregister(pollfd); | |
161 | } | |
162 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
d0b96690 DG |
163 | /* Removing from the poll set */ |
164 | ret = lttng_poll_del(&events, pollfd); | |
165 | if (ret < 0) { | |
166 | goto error; | |
167 | } | |
168 | ||
d88aee68 DG |
169 | /* The socket is closed after a grace period here. */ |
170 | ust_app_notify_sock_unregister(pollfd); | |
d0b96690 | 171 | } else { |
03e43155 MD |
172 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
173 | goto error; | |
d0b96690 | 174 | } |
380e8d6f | 175 | health_code_update(); |
d0b96690 DG |
176 | } |
177 | } | |
178 | } | |
179 | ||
180 | exit: | |
181 | error: | |
182 | lttng_poll_clean(&events); | |
183 | error_poll_create: | |
9ad42ec1 | 184 | error_testpoint: |
d0b96690 DG |
185 | utils_close_pipe(apps_cmd_notify_pipe); |
186 | apps_cmd_notify_pipe[0] = apps_cmd_notify_pipe[1] = -1; | |
187 | DBG("Application notify communication apps thread cleanup complete"); | |
380e8d6f MD |
188 | if (err) { |
189 | health_error(); | |
190 | ERR("Health error occurred in %s", __func__); | |
191 | } | |
8782cc74 | 192 | health_unregister(health_sessiond); |
d0b96690 DG |
193 | rcu_thread_offline(); |
194 | rcu_unregister_thread(); | |
195 | return NULL; | |
196 | } |