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