Clean-up: move global sessiond symbols out of main.o
[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
a7333da7 42/* Notification thread handle. */
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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.
a7333da7 109 * Set in main() with the current page size.
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110 */
111extern long page_size;
112
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113/* Application health monitoring */
114extern struct health_app *health_sessiond;
115
a7333da7 116extern struct sessiond_config config;
26296c48 117
a7333da7 118extern int lttng_sessiond_ready;
f43f95a9 119
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120extern int ust_consumerd64_fd, ust_consumerd32_fd;
121
122/* Parent PID for --sig-parent option */
123extern pid_t ppid;
124/* Internal parent PID use with daemonize. */
125extern pid_t child_ppid;
e9404c27 126
a7333da7 127int sessiond_init_thread_quit_pipe(void);
d0b96690 128int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
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129int sessiond_wait_for_quit_pipe(unsigned int timeout_us);
130int sessiond_notify_quit_pipe(void);
131void sessiond_close_quit_pipe(void);
132
5e97de00 133int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
ef367a93 134void sessiond_notify_ready(void);
9cc1ba3b 135void sessiond_signal_parents(void);
ef367a93 136
fac6795d 137#endif /* _LTT_SESSIOND_H */
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