Sessiond rotation thread
[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>
88564da0 3 * Copyright (C) 2013 - Raphaël Beamonte <raphael.beamonte@gmail.com>
fac6795d 4 *
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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.
8c0faa1d 8 *
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9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
d14d33bf 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
fac6795d 12 * GNU General Public License for more details.
8c0faa1d 13 *
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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.
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17 */
18
19#ifndef _LTT_SESSIOND_H
20#define _LTT_SESSIOND_H
21
f6a9efaa 22#include <urcu.h>
8bdee6e2 23#include <urcu/wfcqueue.h>
099e26bd 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"
88564da0 31#include "version.h"
e9404c27 32#include "notification-thread.h"
e6142f2e 33#include "sessiond-config.h"
099e26bd 34
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35extern const char default_home_dir[],
36 default_tracing_group[],
37 default_ust_sock_dir[],
38 default_global_apps_pipe[];
fac6795d 39
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40/* Set in main.c at boot time of the daemon */
41extern int kernel_tracer_fd;
42
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43extern struct notification_thread_handle *notification_thread_handle;
44
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45/*
46 * This contains extra data needed for processing a command received by the
47 * session daemon from the lttng client.
48 */
49struct 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;
730389d9 55 lttng_sock_cred creds;
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56};
57
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58struct ust_command {
59 int sock;
60 struct ust_register_msg reg_msg;
8bdee6e2 61 struct cds_wfcq_node node;
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62};
63
64/*
7a44d6f1 65 * Queue used to enqueue UST registration request (ust_command) and synchronized
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66 * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
67 */
68struct ust_cmd_queue {
69 int32_t futex;
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70 struct cds_wfcq_head head;
71 struct cds_wfcq_tail tail;
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72};
73
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74/*
75 * This is the wait queue containing wait nodes during the application
76 * registration process.
77 */
78struct 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 */
87struct ust_reg_wait_node {
88 struct ust_app *app;
89 struct cds_list_head head;
90};
91
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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 */
96extern int apps_cmd_notify_pipe[2];
97
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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 */
105extern int ht_cleanup_pipe[2];
106
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107/*
108 * Populated when the daemon starts with the current page size of the system.
109 */
110extern long page_size;
111
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112/* Application health monitoring */
113extern struct health_app *health_sessiond;
114
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115/*
116 * Section name to look for in the daemon configuration file.
117 */
118extern const char * const config_section_name;
119
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120/* Is this daemon root or not. */
121extern int is_root;
122
e6142f2e 123extern struct sessiond_config config;
e9404c27 124
d0b96690 125int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
5e97de00 126int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
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127void sessiond_notify_ready(void);
128
fac6795d 129#endif /* _LTT_SESSIOND_H */
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