Introduce configure --with-lttng-system-rundir
[lttng-tools.git] / src / bin / lttng-sessiond / lttng-sessiond.h
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
fac6795d 3 *
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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.
8c0faa1d 7 *
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8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
d14d33bf 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
fac6795d 11 * GNU General Public License for more details.
8c0faa1d 12 *
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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.
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16 */
17
18#ifndef _LTT_SESSIOND_H
19#define _LTT_SESSIOND_H
20
099e26bd 21#define _LGPL_SOURCE
f6a9efaa 22#include <urcu.h>
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23#include <urcu/wfqueue.h>
24
10a8a223 25#include <common/sessiond-comm/sessiond-comm.h>
d0b96690 26#include <common/compat/poll.h>
730389d9 27#include <common/compat/socket.h>
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28
29#include "session.h"
56fff090 30#include "ust-app.h"
099e26bd 31
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32extern const char default_home_dir[],
33 default_tracing_group[],
34 default_ust_sock_dir[],
35 default_global_apps_pipe[];
fac6795d 36
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37/* Set in main.c at boot time of the daemon */
38extern int kernel_tracer_fd;
39
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40/*
41 * This contains extra data needed for processing a command received by the
42 * session daemon from the lttng client.
43 */
44struct 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;
730389d9 50 lttng_sock_cred creds;
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51};
52
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53struct 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 */
63struct ust_cmd_queue {
64 int32_t futex;
65 struct cds_wfq_queue queue;
66};
67
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68/*
69 * This is the wait queue containing wait nodes during the application
70 * registration process.
71 */
72struct 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 */
81struct ust_reg_wait_node {
82 struct ust_app *app;
83 struct cds_list_head head;
84};
85
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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 */
90extern int apps_cmd_notify_pipe[2];
91
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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 */
99extern int ht_cleanup_pipe[2];
100
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101/*
102 * Populated when the daemon starts with the current page size of the system.
103 */
104extern long page_size;
105
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106int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
107int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
108
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109void *thread_ht_cleanup(void *data);
110
fac6795d 111#endif /* _LTT_SESSIOND_H */
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