Refactor JUL to agent namespace
[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/wfcqueue.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_wfcq_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_wfcq_head head;
68 struct cds_wfcq_tail tail;
69 };
70
71 /*
72 * This is the wait queue containing wait nodes during the application
73 * registration process.
74 */
75 struct ust_reg_wait_queue {
76 unsigned long count;
77 struct cds_list_head head;
78 };
79
80 /*
81 * Use by the dispatch registration to queue UST command socket to wait for the
82 * notify socket.
83 */
84 struct ust_reg_wait_node {
85 struct ust_app *app;
86 struct cds_list_head head;
87 };
88
89 /*
90 * This pipe is used to inform the thread managing application notify
91 * communication that a command is queued and ready to be processed.
92 */
93 extern int apps_cmd_notify_pipe[2];
94
95 /*
96 * Used to notify that a hash table needs to be destroyed by dedicated
97 * thread. Required by design because we don't want to move destroy
98 * paths outside of large RCU read-side lock paths, and destroy cannot
99 * be called by call_rcu thread, because it may hang (waiting for
100 * call_rcu completion).
101 */
102 extern int ht_cleanup_pipe[2];
103
104 /*
105 * Populated when the daemon starts with the current page size of the system.
106 */
107 extern long page_size;
108
109 /*
110 * Global set once in main(). Agent TCP port for registration.
111 */
112 extern unsigned int agent_tcp_port;
113
114 /*
115 * Section name to look for in the daemon configuration file.
116 */
117 extern const char * const config_section_name;
118
119 /* Is this daemon root or not. */
120 extern int is_root;
121
122 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
123 int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
124
125 void *thread_ht_cleanup(void *data);
126
127 void sessiond_notify_ready(void);
128
129 #endif /* _LTT_SESSIOND_H */
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