X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Flttng-sessiond.h;h=9d0b9abd5dd40e2fe8b2b35cadaf4317e5e36952;hp=25e410b25c67fce9d42d80406b382877f4d2ae07;hb=2463b7879c00298daa79744cdaae82ac061a4ed8;hpb=979d476d33cfaf3b0a19b802f5f64d5c2649f1d7 diff --git a/src/bin/lttng-sessiond/lttng-sessiond.h b/src/bin/lttng-sessiond/lttng-sessiond.h index 25e410b25..9d0b9abd5 100644 --- a/src/bin/lttng-sessiond/lttng-sessiond.h +++ b/src/bin/lttng-sessiond/lttng-sessiond.h @@ -1,19 +1,9 @@ /* - * Copyright (C) 2011 - David Goulet - * Copyright (C) 2013 - Raphaël Beamonte + * Copyright (C) 2011 David Goulet + * Copyright (C) 2013 Raphaël Beamonte * - * 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. + * SPDX-License-Identifier: GPL-2.0-only * - * 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 @@ -23,34 +13,77 @@ #include #include +#include #include #include +#include #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, +}; + +/* Unique identifier of a session daemon instance. */ +extern lttng_uuid sessiond_uuid; + +/* + * 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; +extern pthread_mutex_t notification_trigger_tokens_ht_lock; /* * 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; + /* Input message */ + struct lttcomm_session_msg lsm; + /* Reply content, starts with an lttcomm_lttng_msg header. */ + struct lttng_payload reply_payload; lttng_sock_cred creds; }; @@ -88,12 +121,6 @@ struct ust_reg_wait_node { 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 @@ -103,27 +130,43 @@ extern int apps_cmd_notify_pipe[2]; */ 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; -/* - * Section name to look for in the daemon configuration file. - */ -extern const char * const config_section_name; +extern struct sessiond_config config; -/* Is this daemon root or not. */ -extern int is_root; +extern int ust_consumerd64_fd, ust_consumerd32_fd; -extern struct sessiond_config config; +/* 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(int timeout_ms); +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 */