centralize sessiond config option handling
[lttng-tools.git] / src / bin / lttng-sessiond / lttng-sessiond.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2013 - Raphaƫl Beamonte <raphael.beamonte@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #ifndef _LTT_SESSIOND_H
20 #define _LTT_SESSIOND_H
21
22 #include <urcu.h>
23 #include <urcu/wfcqueue.h>
24
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/compat/poll.h>
27 #include <common/compat/socket.h>
28
29 #include "session.h"
30 #include "ust-app.h"
31 #include "version.h"
32 #include "notification-thread.h"
33 #include "sessiond-config.h"
34
35 extern const char default_home_dir[],
36 default_tracing_group[],
37 default_ust_sock_dir[],
38 default_global_apps_pipe[];
39
40 /* Set in main.c at boot time of the daemon */
41 extern int kernel_tracer_fd;
42
43 extern struct notification_thread_handle *notification_thread_handle;
44
45 /*
46 * This contains extra data needed for processing a command received by the
47 * session daemon from the lttng client.
48 */
49 struct command_ctx {
50 int ust_sock;
51 unsigned int lttng_msg_size;
52 struct ltt_session *session;
53 struct lttcomm_lttng_msg *llm;
54 struct lttcomm_session_msg *lsm;
55 lttng_sock_cred creds;
56 };
57
58 struct ust_command {
59 int sock;
60 struct ust_register_msg reg_msg;
61 struct cds_wfcq_node node;
62 };
63
64 /*
65 * Queue used to enqueue UST registration request (ust_command) and synchronized
66 * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
67 */
68 struct ust_cmd_queue {
69 int32_t futex;
70 struct cds_wfcq_head head;
71 struct cds_wfcq_tail tail;
72 };
73
74 /*
75 * This is the wait queue containing wait nodes during the application
76 * registration process.
77 */
78 struct ust_reg_wait_queue {
79 unsigned long count;
80 struct cds_list_head head;
81 };
82
83 /*
84 * Use by the dispatch registration to queue UST command socket to wait for the
85 * notify socket.
86 */
87 struct ust_reg_wait_node {
88 struct ust_app *app;
89 struct cds_list_head head;
90 };
91
92 /*
93 * This pipe is used to inform the thread managing application notify
94 * communication that a command is queued and ready to be processed.
95 */
96 extern int apps_cmd_notify_pipe[2];
97
98 /*
99 * Used to notify that a hash table needs to be destroyed by dedicated
100 * thread. Required by design because we don't want to move destroy
101 * paths outside of large RCU read-side lock paths, and destroy cannot
102 * be called by call_rcu thread, because it may hang (waiting for
103 * call_rcu completion).
104 */
105 extern int ht_cleanup_pipe[2];
106
107 /*
108 * Populated when the daemon starts with the current page size of the system.
109 */
110 extern long page_size;
111
112 /* Application health monitoring */
113 extern struct health_app *health_sessiond;
114
115 /*
116 * Section name to look for in the daemon configuration file.
117 */
118 extern const char * const config_section_name;
119
120 /* Is this daemon root or not. */
121 extern int is_root;
122
123 extern struct sessiond_config config;
124
125 int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
126 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
127 void sessiond_notify_ready(void);
128
129 #endif /* _LTT_SESSIOND_H */
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