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[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 #define _LGPL_SOURCE
23 #include <urcu.h>
24 #include <urcu/wfqueue.h>
25
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/compat/poll.h>
28 #include <common/compat/socket.h>
29
30 #include "session.h"
31 #include "ust-app.h"
32 #include "version.h"
33
34 extern const char default_home_dir[],
35 default_tracing_group[],
36 default_ust_sock_dir[],
37 default_global_apps_pipe[];
38
39 /* Set in main.c at boot time of the daemon */
40 extern int kernel_tracer_fd;
41
42 /*
43 * This contains extra data needed for processing a command received by the
44 * session daemon from the lttng client.
45 */
46 struct command_ctx {
47 int ust_sock;
48 unsigned int lttng_msg_size;
49 struct ltt_session *session;
50 struct lttcomm_lttng_msg *llm;
51 struct lttcomm_session_msg *lsm;
52 lttng_sock_cred creds;
53 };
54
55 struct ust_command {
56 int sock;
57 struct ust_register_msg reg_msg;
58 struct cds_wfq_node node;
59 };
60
61 /*
62 * Queue used to enqueue UST registration request (ust_commant) and protected
63 * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
64 */
65 struct ust_cmd_queue {
66 int32_t futex;
67 struct cds_wfq_queue queue;
68 };
69
70 /*
71 * This is the wait queue containing wait nodes during the application
72 * registration process.
73 */
74 struct ust_reg_wait_queue {
75 unsigned long count;
76 struct cds_list_head head;
77 };
78
79 /*
80 * Use by the dispatch registration to queue UST command socket to wait for the
81 * notify socket.
82 */
83 struct ust_reg_wait_node {
84 struct ust_app *app;
85 struct cds_list_head head;
86 };
87
88 /*
89 * This pipe is used to inform the thread managing application notify
90 * communication that a command is queued and ready to be processed.
91 */
92 extern int apps_cmd_notify_pipe[2];
93
94 /*
95 * Used to notify that a hash table needs to be destroyed by dedicated
96 * thread. Required by design because we don't want to move destroy
97 * paths outside of large RCU read-side lock paths, and destroy cannot
98 * be called by call_rcu thread, because it may hang (waiting for
99 * call_rcu completion).
100 */
101 extern int ht_cleanup_pipe[2];
102
103 /*
104 * Populated when the daemon starts with the current page size of the system.
105 */
106 extern long page_size;
107
108 /*
109 * Global set once in main(). JUL TCP port for registration.
110 */
111 extern unsigned int jul_tcp_port;
112
113 /*
114 * Section name to look for in the daemon configuration file.
115 */
116 extern const char * const config_section_name;
117
118 /* Is this daemon root or not. */
119 extern int is_root;
120
121 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
122 int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
123
124 void *thread_ht_cleanup(void *data);
125
126 void sessiond_notify_ready(void);
127
128 #endif /* _LTT_SESSIOND_H */
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