+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2013 - Raphaël Beamonte <raphael.beamonte@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef _LTT_SESSIOND_H
-#define _LTT_SESSIOND_H
-
-#include <urcu.h>
-#include <urcu/wfcqueue.h>
-
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/compat/poll.h>
-#include <common/compat/socket.h>
-
-#include "session.h"
-#include "ust-app.h"
-#include "notification-thread.h"
-#include "sessiond-config.h"
-
-/*
- * Consumer daemon state which is changed when spawning it, killing it or in
- * case of a fatal error.
- */
-enum consumerd_state {
- CONSUMER_STARTED = 1,
- CONSUMER_STOPPED = 2,
- CONSUMER_ERROR = 3,
-};
-
-/*
- * This consumer daemon state is used to validate if a client command will be
- * able to reach the consumer. If not, the client is informed. For instance,
- * doing a "lttng start" when the consumer state is set to ERROR will return an
- * error to the client.
- *
- * The following example shows a possible race condition of this scheme:
- *
- * consumer thread error happens
- * client cmd arrives
- * client cmd checks state -> still OK
- * consumer thread exit, sets error
- * client cmd try to talk to consumer
- * ...
- *
- * However, since the consumer is a different daemon, we have no way of making
- * sure the command will reach it safely even with this state flag. This is why
- * we consider that up to the state validation during command processing, the
- * command is safe. After that, we can not guarantee the correctness of the
- * client request vis-a-vis the consumer.
- */
-extern enum consumerd_state ust_consumerd_state;
-extern enum consumerd_state kernel_consumerd_state;
-
-extern const char default_home_dir[],
- default_tracing_group[],
- default_ust_sock_dir[],
- default_global_apps_pipe[];
-
-/* Set in main.c at boot time of the daemon */
-extern int kernel_tracer_fd;
-extern struct lttng_kernel_tracer_version kernel_tracer_version;
-extern struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version;
-
-/* Notification thread handle. */
-extern struct notification_thread_handle *notification_thread_handle;
-
-/*
- * This contains extra data needed for processing a command received by the
- * session daemon from the lttng client.
- */
-struct command_ctx {
- int ust_sock;
- unsigned int lttng_msg_size;
- struct ltt_session *session;
- struct lttcomm_lttng_msg *llm;
- struct lttcomm_session_msg *lsm;
- lttng_sock_cred creds;
-};
-
-struct ust_command {
- int sock;
- struct ust_register_msg reg_msg;
- struct cds_wfcq_node node;
-};
-
-/*
- * Queue used to enqueue UST registration request (ust_command) and synchronized
- * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
- */
-struct ust_cmd_queue {
- int32_t futex;
- struct cds_wfcq_head head;
- struct cds_wfcq_tail tail;
-};
-
-/*
- * This is the wait queue containing wait nodes during the application
- * registration process.
- */
-struct ust_reg_wait_queue {
- unsigned long count;
- struct cds_list_head head;
-};
-
-/*
- * Use by the dispatch registration to queue UST command socket to wait for the
- * notify socket.
- */
-struct ust_reg_wait_node {
- struct ust_app *app;
- struct cds_list_head head;
-};
-
-/*
- * This pipe is used to inform the thread managing application notify
- * communication that a command is queued and ready to be processed.
- */
-extern int apps_cmd_notify_pipe[2];
-
-/*
- * Used to notify that a hash table needs to be destroyed by dedicated
- * thread. Required by design because we don't want to move destroy
- * paths outside of large RCU read-side lock paths, and destroy cannot
- * be called by call_rcu thread, because it may hang (waiting for
- * call_rcu completion).
- */
-extern int ht_cleanup_pipe[2];
-
-extern int kernel_poll_pipe[2];
-
-/*
- * Populated when the daemon starts with the current page size of the system.
- * Set in main() with the current page size.
- */
-extern long page_size;
-
-/* Application health monitoring */
-extern struct health_app *health_sessiond;
-
-extern struct sessiond_config config;
-
-extern int lttng_sessiond_ready;
-
-extern int ust_consumerd64_fd, ust_consumerd32_fd;
-
-/* Parent PID for --sig-parent option */
-extern pid_t ppid;
-/* Internal parent PID use with daemonize. */
-extern pid_t child_ppid;
-
-/* Consumer daemon specific control data. */
-extern struct consumer_data ustconsumer32_data;
-extern struct consumer_data ustconsumer64_data;
-extern struct consumer_data kconsumer_data;
-
-int sessiond_init_thread_quit_pipe(void);
-int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
-int sessiond_wait_for_quit_pipe(unsigned int timeout_us);
-int sessiond_notify_quit_pipe(void);
-void sessiond_close_quit_pipe(void);
-
-int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
-void sessiond_notify_ready(void);
-void sessiond_signal_parents(void);
-
-void sessiond_set_client_thread_state(bool running);
-void sessiond_wait_client_thread_stopped(void);
-
-void *thread_manage_consumer(void *data);
-
-#endif /* _LTT_SESSIOND_H */
projects / lttng-tools.git / blobdiff