Implement 2-step registration of userspace probe events
[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"
e9404c27 31#include "notification-thread.h"
e6142f2e 32#include "sessiond-config.h"
099e26bd 33
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34extern const char default_home_dir[],
35 default_tracing_group[],
36 default_ust_sock_dir[],
37 default_global_apps_pipe[];
fac6795d 38
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39/* Set in main.c at boot time of the daemon */
40extern int kernel_tracer_fd;
41
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42extern struct notification_thread_handle *notification_thread_handle;
43
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44/*
45 * This contains extra data needed for processing a command received by the
46 * session daemon from the lttng client.
47 */
48struct command_ctx {
49 int ust_sock;
50 unsigned int lttng_msg_size;
51 struct ltt_session *session;
52 struct lttcomm_lttng_msg *llm;
53 struct lttcomm_session_msg *lsm;
730389d9 54 lttng_sock_cred creds;
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55};
56
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57struct ust_command {
58 int sock;
59 struct ust_register_msg reg_msg;
8bdee6e2 60 struct cds_wfcq_node node;
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61};
62
63/*
7a44d6f1 64 * Queue used to enqueue UST registration request (ust_command) and synchronized
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65 * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
66 */
67struct ust_cmd_queue {
68 int32_t futex;
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69 struct cds_wfcq_head head;
70 struct cds_wfcq_tail tail;
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71};
72
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73/*
74 * This is the wait queue containing wait nodes during the application
75 * registration process.
76 */
77struct ust_reg_wait_queue {
78 unsigned long count;
79 struct cds_list_head head;
80};
81
82/*
83 * Use by the dispatch registration to queue UST command socket to wait for the
84 * notify socket.
85 */
86struct ust_reg_wait_node {
87 struct ust_app *app;
88 struct cds_list_head head;
89};
90
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91/*
92 * This pipe is used to inform the thread managing application notify
93 * communication that a command is queued and ready to be processed.
94 */
95extern int apps_cmd_notify_pipe[2];
96
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97/*
98 * Used to notify that a hash table needs to be destroyed by dedicated
99 * thread. Required by design because we don't want to move destroy
100 * paths outside of large RCU read-side lock paths, and destroy cannot
101 * be called by call_rcu thread, because it may hang (waiting for
102 * call_rcu completion).
103 */
104extern int ht_cleanup_pipe[2];
105
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106/*
107 * Populated when the daemon starts with the current page size of the system.
108 */
109extern long page_size;
110
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111/* Application health monitoring */
112extern struct health_app *health_sessiond;
113
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114/*
115 * Section name to look for in the daemon configuration file.
116 */
117extern const char * const config_section_name;
118
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119/* Is this daemon root or not. */
120extern int is_root;
121
e6142f2e 122extern struct sessiond_config config;
e9404c27 123
d0b96690 124int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
5e97de00 125int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
ef367a93 126void sessiond_notify_ready(void);
9cc1ba3b 127void sessiond_signal_parents(void);
ef367a93 128
fac6795d 129#endif /* _LTT_SESSIOND_H */
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