Commit | Line | Data |
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8c0faa1d | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa | 3 | * Copyright (C) 2013 Raphaël Beamonte <raphael.beamonte@gmail.com> |
fac6795d | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
8c0faa1d | 6 | * |
fac6795d DG |
7 | */ |
8 | ||
9 | #ifndef _LTT_SESSIOND_H | |
10 | #define _LTT_SESSIOND_H | |
11 | ||
0038180d JG |
12 | #include "notification-thread.hpp" |
13 | #include "rotation-thread.hpp" | |
14 | #include "session.hpp" | |
15 | #include "sessiond-config.hpp" | |
16 | #include "ust-app.hpp" | |
099e26bd | 17 | |
c9e313bc SM |
18 | #include <common/compat/poll.hpp> |
19 | #include <common/compat/socket.hpp> | |
0038180d JG |
20 | #include <common/payload.hpp> |
21 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
c9e313bc | 22 | #include <common/uuid.hpp> |
10a8a223 | 23 | |
0038180d JG |
24 | #include <urcu.h> |
25 | #include <urcu/wfcqueue.h> | |
099e26bd | 26 | |
917a718d JG |
27 | /* |
28 | * Consumer daemon state which is changed when spawning it, killing it or in | |
29 | * case of a fatal error. | |
30 | */ | |
31 | enum consumerd_state { | |
32 | CONSUMER_STARTED = 1, | |
33 | CONSUMER_STOPPED = 2, | |
28f23191 | 34 | CONSUMER_ERROR = 3, |
917a718d JG |
35 | }; |
36 | ||
52a0e931 | 37 | /* Unique identifier of a session daemon instance. */ |
412d7227 | 38 | extern lttng_uuid the_sessiond_uuid; |
52a0e931 | 39 | |
917a718d JG |
40 | /* |
41 | * This consumer daemon state is used to validate if a client command will be | |
42 | * able to reach the consumer. If not, the client is informed. For instance, | |
43 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
44 | * error to the client. | |
45 | * | |
46 | * The following example shows a possible race condition of this scheme: | |
47 | * | |
48 | * consumer thread error happens | |
49 | * client cmd arrives | |
50 | * client cmd checks state -> still OK | |
51 | * consumer thread exit, sets error | |
52 | * client cmd try to talk to consumer | |
53 | * ... | |
54 | * | |
55 | * However, since the consumer is a different daemon, we have no way of making | |
56 | * sure the command will reach it safely even with this state flag. This is why | |
57 | * we consider that up to the state validation during command processing, the | |
58 | * command is safe. After that, we can not guarantee the correctness of the | |
59 | * client request vis-a-vis the consumer. | |
60 | */ | |
412d7227 SM |
61 | extern enum consumerd_state the_ust_consumerd_state; |
62 | extern enum consumerd_state the_kernel_consumerd_state; | |
917a718d | 63 | |
2f77fc4b | 64 | /* Set in main.c at boot time of the daemon */ |
b8e2fb80 FD |
65 | extern struct lttng_kernel_abi_tracer_version the_kernel_tracer_version; |
66 | extern struct lttng_kernel_abi_tracer_abi_version the_kernel_tracer_abi_version; | |
2f77fc4b | 67 | |
a7333da7 | 68 | /* Notification thread handle. */ |
412d7227 | 69 | extern struct notification_thread_handle *the_notification_thread_handle; |
e9404c27 | 70 | |
0038180d JG |
71 | /* Rotation thread handle. */ |
72 | extern lttng::sessiond::rotation_thread::uptr the_rotation_thread_handle; | |
73 | ||
5461b305 DG |
74 | /* |
75 | * This contains extra data needed for processing a command received by the | |
76 | * session daemon from the lttng client. | |
77 | */ | |
78 | struct command_ctx { | |
5461b305 | 79 | unsigned int lttng_msg_size; |
3a91de3a JG |
80 | /* Input message */ |
81 | struct lttcomm_session_msg lsm; | |
82 | /* Reply content, starts with an lttcomm_lttng_msg header. */ | |
83 | struct lttng_payload reply_payload; | |
730389d9 | 84 | lttng_sock_cred creds; |
5461b305 DG |
85 | }; |
86 | ||
099e26bd DG |
87 | struct ust_command { |
88 | int sock; | |
89 | struct ust_register_msg reg_msg; | |
8bdee6e2 | 90 | struct cds_wfcq_node node; |
099e26bd DG |
91 | }; |
92 | ||
93 | /* | |
7a44d6f1 | 94 | * Queue used to enqueue UST registration request (ust_command) and synchronized |
099e26bd DG |
95 | * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h |
96 | */ | |
97 | struct ust_cmd_queue { | |
98 | int32_t futex; | |
8bdee6e2 SM |
99 | struct cds_wfcq_head head; |
100 | struct cds_wfcq_tail tail; | |
099e26bd DG |
101 | }; |
102 | ||
f45e313d DG |
103 | /* |
104 | * This is the wait queue containing wait nodes during the application | |
105 | * registration process. | |
106 | */ | |
107 | struct ust_reg_wait_queue { | |
108 | unsigned long count; | |
109 | struct cds_list_head head; | |
110 | }; | |
111 | ||
112 | /* | |
113 | * Use by the dispatch registration to queue UST command socket to wait for the | |
114 | * notify socket. | |
115 | */ | |
116 | struct ust_reg_wait_node { | |
117 | struct ust_app *app; | |
118 | struct cds_list_head head; | |
119 | }; | |
120 | ||
412d7227 | 121 | extern int the_kernel_poll_pipe[2]; |
e32d7f27 | 122 | |
12744796 DG |
123 | /* |
124 | * Populated when the daemon starts with the current page size of the system. | |
a7333da7 | 125 | * Set in main() with the current page size. |
12744796 | 126 | */ |
412d7227 | 127 | extern long the_page_size; |
12744796 | 128 | |
5e97de00 | 129 | /* Application health monitoring */ |
412d7227 | 130 | extern struct health_app *the_health_sessiond; |
5e97de00 | 131 | |
412d7227 | 132 | extern struct sessiond_config the_config; |
26296c48 | 133 | |
412d7227 | 134 | extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd; |
a7333da7 JG |
135 | |
136 | /* Parent PID for --sig-parent option */ | |
412d7227 | 137 | extern pid_t the_ppid; |
a7333da7 | 138 | /* Internal parent PID use with daemonize. */ |
412d7227 | 139 | extern pid_t the_child_ppid; |
e9404c27 | 140 | |
917a718d | 141 | /* Consumer daemon specific control data. */ |
412d7227 SM |
142 | extern struct consumer_data the_ustconsumer32_data; |
143 | extern struct consumer_data the_ustconsumer64_data; | |
144 | extern struct consumer_data the_kconsumer_data; | |
917a718d | 145 | |
0f4aa1a8 | 146 | int sessiond_init_main_quit_pipe(); |
f90a04ed | 147 | int sessiond_wait_for_main_quit_pipe(int timeout_ms); |
0f4aa1a8 JG |
148 | int sessiond_notify_main_quit_pipe(); |
149 | void sessiond_close_main_quit_pipe(); | |
a7333da7 | 150 | |
5e97de00 | 151 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size); |
0f4aa1a8 | 152 | void sessiond_signal_parents(); |
ef367a93 | 153 | |
99d688f2 | 154 | void sessiond_set_client_thread_state(bool running); |
0f4aa1a8 | 155 | void sessiond_wait_client_thread_stopped(); |
99d688f2 | 156 | |
917a718d JG |
157 | void *thread_manage_consumer(void *data); |
158 | ||
fac6795d | 159 | #endif /* _LTT_SESSIOND_H */ |