X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fmain.c;h=46c98a5611b9e818c0c99e7e7a64bcd56a02b60e;hp=d9f7667b1df95497e8e76420cc35ab5f5bfb69ec;hb=133842876fe8a87ba184c9ac2b6e004eb388fb73;hpb=950131af6bda07be09bc88fe3ecba68ee21e6c26 diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c index d9f7667b1..46c98a561 100644 --- a/ltt-sessiond/main.c +++ b/ltt-sessiond/main.c @@ -1,19 +1,19 @@ /* * Copyright (C) 2011 - David Goulet + * Mathieu Desnoyers * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; only version 2 of the License. * - * 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. + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * 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., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307, USA. */ #define _GNU_SOURCE @@ -27,34 +27,33 @@ #include #include #include -#include -#include +#include +#include +#include #include #include #include -#include -#include +#include +#include #include -#include /* URCU list library (-lurcu) */ -#include +#include +#include +#include +#include -#include "liblttsessiondcomm.h" -#include "ltt-sessiond.h" -#include "lttngerr.h" +#include "channel.h" +#include "compat/poll.h" +#include "context.h" +#include "event.h" +#include "futex.h" #include "kernel-ctl.h" +#include "ltt-sessiond.h" +#include "shm.h" +#include "ust-app.h" +#include "ust-ctl.h" +#include "utils.h" #include "ust-ctl.h" -#include "session.h" -#include "traceable-app.h" -#include "lttng-kconsumerd.h" -#include "libustctl.h" - -/* - * TODO: - * teardown: signal SIGTERM handler -> write into pipe. Threads waits - * with epoll on pipe and on other pipes/sockets for commands. Main - * simply waits on pthread join. - */ /* Const values */ const char default_home_dir[] = DEFAULT_HOME_DIR; @@ -64,7 +63,9 @@ const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; /* Variables */ int opt_verbose; /* Not static for lttngerr.h */ +int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ int opt_quiet; /* Not static for lttngerr.h */ + const char *progname; const char *opt_tracing_group; static int opt_sig_parent; @@ -72,11 +73,17 @@ static int opt_daemon; static int is_root; /* Set to 1 if the daemon is running as root */ static pid_t ppid; /* Parent PID for --sig-parent option */ static pid_t kconsumerd_pid; - -static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ -static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ -static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ -static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ +static int dispatch_thread_exit; + +/* Global application Unix socket path */ +static char apps_unix_sock_path[PATH_MAX]; +/* Global client Unix socket path */ +static char client_unix_sock_path[PATH_MAX]; +/* kconsumerd error and command Unix socket path */ +static char kconsumerd_err_unix_sock_path[PATH_MAX]; +static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; +/* global wait shm path for UST */ +static char wait_shm_path[PATH_MAX]; /* Sockets and FDs */ static int client_sock; @@ -84,93 +91,279 @@ static int apps_sock; static int kconsumerd_err_sock; static int kconsumerd_cmd_sock; static int kernel_tracer_fd; +static int kernel_poll_pipe[2]; + +/* + * Quit pipe for all threads. This permits a single cancellation point + * for all threads when receiving an event on the pipe. + */ +static int thread_quit_pipe[2]; + +/* + * This pipe is used to inform the thread managing application communication + * that a command is queued and ready to be processed. + */ +static int apps_cmd_pipe[2]; /* Pthread, Mutexes and Semaphores */ static pthread_t kconsumerd_thread; static pthread_t apps_thread; +static pthread_t reg_apps_thread; static pthread_t client_thread; +static pthread_t kernel_thread; +static pthread_t dispatch_thread; static sem_t kconsumerd_sem; -static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ + +/* Mutex to control kconsumerd pid assignation */ +static pthread_mutex_t kconsumerd_pid_mutex; + +/* + * UST registration command queue. This queue is tied with a futex and uses a N + * wakers / 1 waiter implemented and detailed in futex.c/.h + * + * The thread_manage_apps and thread_dispatch_ust_registration interact with + * this queue and the wait/wake scheme. + */ +static struct ust_cmd_queue ust_cmd_queue; + +/* + * Pointer initialized before thread creation. + * + * This points to the tracing session list containing the session count and a + * mutex lock. The lock MUST be taken if you iterate over the list. The lock + * MUST NOT be taken if you call a public function in session.c. + * + * The lock is nested inside the structure: session_list_ptr->lock. Please use + * session_lock_list and session_unlock_list for lock acquisition. + */ +static struct ltt_session_list *session_list_ptr; + +/* + * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. + */ +static int create_thread_poll_set(struct lttng_poll_event *events, + unsigned int size) +{ + int ret; + + if (events == NULL || size == 0) { + ret = -1; + goto error; + } + + ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); + if (ret < 0) { + goto error; + } + + /* Add quit pipe */ + ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); + if (ret < 0) { + goto error; + } + + return 0; + +error: + return ret; +} + +/* + * Check if the thread quit pipe was triggered. + * + * Return 1 if it was triggered else 0; + */ +static int check_thread_quit_pipe(int fd, uint32_t events) +{ + if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { + return 1; + } + + return 0; +} + +/* + * Remove modules in reverse load order. + */ +static int modprobe_remove_kernel_modules(void) +{ + int ret = 0, i; + char modprobe[256]; + + for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { + ret = snprintf(modprobe, sizeof(modprobe), + "/sbin/modprobe --remove --quiet %s", + kernel_modules_list[i].name); + if (ret < 0) { + perror("snprintf modprobe --remove"); + goto error; + } + modprobe[sizeof(modprobe) - 1] = '\0'; + ret = system(modprobe); + if (ret == -1) { + ERR("Unable to launch modprobe --remove for module %s", + kernel_modules_list[i].name); + } else if (kernel_modules_list[i].required + && WEXITSTATUS(ret) != 0) { + ERR("Unable to remove module %s", + kernel_modules_list[i].name); + } else { + DBG("Modprobe removal successful %s", + kernel_modules_list[i].name); + } + } + +error: + return ret; +} + +/* + * Return group ID of the tracing group or -1 if not found. + */ +static gid_t allowed_group(void) +{ + struct group *grp; + + if (opt_tracing_group) { + grp = getgrnam(opt_tracing_group); + } else { + grp = getgrnam(default_tracing_group); + } + if (!grp) { + return -1; + } else { + return grp->gr_gid; + } +} /* - * teardown_kernel_session + * Init thread quit pipe. * - * Complete teardown of a kernel session. This free all data structure - * related to a kernel session and update counter. + * Return -1 on error or 0 if all pipes are created. + */ +static int init_thread_quit_pipe(void) +{ + int ret; + + ret = pipe2(thread_quit_pipe, O_CLOEXEC); + if (ret < 0) { + perror("thread quit pipe"); + goto error; + } + +error: + return ret; +} + +/* + * Complete teardown of a kernel session. This free all data structure related + * to a kernel session and update counter. */ static void teardown_kernel_session(struct ltt_session *session) { if (session->kernel_session != NULL) { DBG("Tearing down kernel session"); - trace_destroy_kernel_session(session->kernel_session); + + /* + * If a custom kernel consumer was registered, close the socket before + * tearing down the complete kernel session structure + */ + if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { + lttcomm_close_unix_sock(session->kernel_session->consumer_fd); + } + + trace_kernel_destroy_session(session->kernel_session); /* Extra precaution */ session->kernel_session = NULL; - /* Decrement session count */ - session->kern_session_count--; } } /* - * cleanup - * - * Cleanup the daemon on exit + * Stop all threads by closing the thread quit pipe. + */ +static void stop_threads(void) +{ + int ret; + + /* Stopping all threads */ + DBG("Terminating all threads"); + ret = notify_thread_pipe(thread_quit_pipe[1]); + if (ret < 0) { + ERR("write error on thread quit pipe"); + } + + /* Dispatch thread */ + dispatch_thread_exit = 1; + futex_nto1_wake(&ust_cmd_queue.futex); +} + +/* + * Cleanup the daemon */ -static void cleanup() +static void cleanup(void) { int ret; char *cmd; - struct ltt_session *sess; + struct ltt_session *sess, *stmp; DBG("Cleaning up"); /* */ - MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); - MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); + MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" + "Matthew, BEET driven development works!%c[%dm", + 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); /* */ - /* Stopping all threads */ - DBG("Terminating all threads"); - pthread_cancel(client_thread); - pthread_cancel(apps_thread); - if (kconsumerd_pid != 0) { - pthread_cancel(kconsumerd_thread); + if (is_root) { + DBG("Removing %s directory", LTTNG_RUNDIR); + ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); + if (ret < 0) { + ERR("asprintf failed. Something is really wrong!"); + } + + /* Remove lttng run directory */ + ret = system(cmd); + if (ret < 0) { + ERR("Unable to clean " LTTNG_RUNDIR); + } } - DBG("Unlinking all unix socket"); - unlink(client_unix_sock_path); - unlink(apps_unix_sock_path); - unlink(kconsumerd_err_unix_sock_path); + DBG("Cleaning up all session"); - DBG("Removing %s directory", LTTNG_RUNDIR); - ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); - if (ret < 0) { - ERR("asprintf failed. Something is really wrong!"); - } + /* Destroy session list mutex */ + if (session_list_ptr != NULL) { + pthread_mutex_destroy(&session_list_ptr->lock); - /* Remove lttng run directory */ - ret = system(cmd); - if (ret < 0) { - ERR("Unable to clean " LTTNG_RUNDIR); + /* Cleanup ALL session */ + cds_list_for_each_entry_safe(sess, stmp, + &session_list_ptr->head, list) { + teardown_kernel_session(sess); + // TODO complete session cleanup (including UST) + } } - DBG("Cleaning up all session"); - /* Cleanup ALL session */ - cds_list_for_each_entry(sess, <t_session_list.head, list) { - teardown_kernel_session(sess); - // TODO complete session cleanup (including UST) - } + DBG("Closing all UST sockets"); + ust_app_clean_list(); + + pthread_mutex_destroy(&kconsumerd_pid_mutex); DBG("Closing kernel fd"); close(kernel_tracer_fd); + + if (is_root) { + DBG("Unloading kernel modules"); + modprobe_remove_kernel_modules(); + } + + close(thread_quit_pipe[0]); + close(thread_quit_pipe[1]); } /* - * send_unix_sock + * Send data on a unix socket using the liblttsessiondcomm API. * - * Send data on a unix socket using the liblttsessiondcomm API. - * - * Return lttcomm error code. + * Return lttcomm error code. */ static int send_unix_sock(int sock, void *buf, size_t len) { @@ -183,77 +376,66 @@ static int send_unix_sock(int sock, void *buf, size_t len) } /* - * clean_command_ctx - * - * Free memory of a command context structure. + * Free memory of a command context structure. */ -static void clean_command_ctx(struct command_ctx *cmd_ctx) +static void clean_command_ctx(struct command_ctx **cmd_ctx) { - DBG("Clean command context structure %p", cmd_ctx); - if (cmd_ctx) { - if (cmd_ctx->llm) { - free(cmd_ctx->llm); + DBG("Clean command context structure"); + if (*cmd_ctx) { + if ((*cmd_ctx)->llm) { + free((*cmd_ctx)->llm); } - if (cmd_ctx->lsm) { - free(cmd_ctx->lsm); + if ((*cmd_ctx)->lsm) { + free((*cmd_ctx)->lsm); } - free(cmd_ctx); - cmd_ctx = NULL; + free(*cmd_ctx); + *cmd_ctx = NULL; } } /* - * send_kconsumerd_fds - * - * Send all stream fds of the kernel session to the consumer. + * Send all stream fds of kernel channel to the consumer. */ -static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) +static int send_kconsumerd_channel_fds(int sock, + struct ltt_kernel_channel *channel) { int ret; size_t nb_fd; struct ltt_kernel_stream *stream; - struct ltt_kernel_channel *chan; struct lttcomm_kconsumerd_header lkh; struct lttcomm_kconsumerd_msg lkm; - nb_fd = session->stream_count_global; + DBG("Sending fds of channel %s to kernel consumer", + channel->channel->name); + + nb_fd = channel->stream_count; /* Setup header */ - lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg); + lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); lkh.cmd_type = ADD_STREAM; DBG("Sending kconsumerd header"); - ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); + ret = lttcomm_send_unix_sock(sock, &lkh, + sizeof(struct lttcomm_kconsumerd_header)); if (ret < 0) { perror("send kconsumerd header"); goto error; } - DBG("Sending metadata stream fd"); - - /* Send metadata stream fd first */ - lkm.fd = session->metadata_stream_fd; - lkm.state = ACTIVE_FD; - lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; - strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); - - ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); - if (ret < 0) { - perror("send kconsumerd fd"); - goto error; - } - - cds_list_for_each_entry(chan, &session->channel_list.head, list) { - cds_list_for_each_entry(stream, &chan->stream_list.head, list) { + cds_list_for_each_entry(stream, &channel->stream_list.head, list) { + if (stream->fd != 0) { lkm.fd = stream->fd; lkm.state = stream->state; - lkm.max_sb_size = chan->channel->attr.subbuf_size; + lkm.max_sb_size = channel->channel->attr.subbuf_size; + lkm.output = channel->channel->attr.output; strncpy(lkm.path_name, stream->pathname, PATH_MAX); + lkm.path_name[PATH_MAX - 1] = '\0'; DBG("Sending fd %d to kconsumerd", lkm.fd); - ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); + ret = lttcomm_send_fds_unix_sock(sock, &lkm, + &lkm.fd, 1, sizeof(lkm)); if (ret < 0) { perror("send kconsumerd fd"); goto error; @@ -261,7 +443,7 @@ static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) } } - DBG("Kconsumerd fds sent"); + DBG("Kconsumerd channel fds sent"); return 0; @@ -270,106 +452,98 @@ error: } /* - * create_trace_dir - * - * Create the trace output directory. + * Send all stream fds of the kernel session to the consumer. */ -static int create_trace_dir(struct ltt_kernel_session *session) +static int send_kconsumerd_fds(struct ltt_kernel_session *session) { int ret; struct ltt_kernel_channel *chan; + struct lttcomm_kconsumerd_header lkh; + struct lttcomm_kconsumerd_msg lkm; - /* Create all channel directories */ - cds_list_for_each_entry(chan, &session->channel_list.head, list) { - DBG("Creating trace directory at %s", chan->pathname); - // TODO: recursive create dir - ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG ); - if (ret < 0) { - if (ret != EEXIST) { - perror("mkdir trace path"); - ret = -errno; - goto error; - } - } - } + /* Setup header */ + lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); + lkh.cmd_type = ADD_STREAM; - return 0; + DBG("Sending kconsumerd header for metadata"); -error: - return ret; -} + ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, + sizeof(struct lttcomm_kconsumerd_header)); + if (ret < 0) { + perror("send kconsumerd header"); + goto error; + } -/* - * ust_connect_app - * - * Return a socket connected to the libust communication socket - * of the application identified by the pid. - * - * If the pid is not found in the traceable list, - * return -1 to indicate error. - */ -static int ust_connect_app(pid_t pid) -{ - int sock; - struct ltt_traceable_app *lta; + DBG("Sending metadata stream fd"); - DBG("Connect to application pid %d", pid); + /* Extra protection. It's NOT suppose to be set to 0 at this point */ + if (session->consumer_fd == 0) { + session->consumer_fd = kconsumerd_cmd_sock; + } - lta = find_app_by_pid(pid); - if (lta == NULL) { - /* App not found */ - DBG("Application pid %d not found", pid); - return -1; + if (session->metadata_stream_fd != 0) { + /* Send metadata stream fd first */ + lkm.fd = session->metadata_stream_fd; + lkm.state = ACTIVE_FD; + lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; + lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; + strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); + lkm.path_name[PATH_MAX - 1] = '\0'; + + ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, + &lkm.fd, 1, sizeof(lkm)); + if (ret < 0) { + perror("send kconsumerd fd"); + goto error; + } } - sock = ustctl_connect_pid(lta->pid); - if (sock < 0) { - ERR("Fail connecting to the PID %d", pid); + cds_list_for_each_entry(chan, &session->channel_list.head, list) { + ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); + if (ret < 0) { + goto error; + } } - return sock; + DBG("Kconsumerd fds (metadata and channel streams) sent"); + + return 0; + +error: + return ret; } /* - * notify_apps - * - * Notify apps by writing 42 to a named pipe using name. - * Every applications waiting for a ltt-sessiond will be notified - * and re-register automatically to the session daemon. - * - * Return open or write error value. + * Notify UST applications using the shm mmap futex. */ -static int notify_apps(const char *name) +static int notify_ust_apps(int active) { - int fd; - int ret = -1; + char *wait_shm_mmap; - DBG("Notify the global application pipe"); + DBG("Notifying applications of session daemon state: %d", active); - /* Try opening the global pipe */ - fd = open(name, O_WRONLY); - if (fd < 0) { + /* See shm.c for this call implying mmap, shm and futex calls */ + wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); + if (wait_shm_mmap == NULL) { goto error; } - /* Notify by writing on the pipe */ - ret = write(fd, "42", 2); - if (ret < 0) { - perror("write"); - } + /* Wake waiting process */ + futex_wait_update((int32_t *) wait_shm_mmap, active); + + /* Apps notified successfully */ + return 0; error: - return ret; + return -1; } /* - * setup_lttng_msg - * - * Setup the outgoing data buffer for the response (llm) by allocating the - * right amount of memory and copying the original information from the lsm - * structure. + * Setup the outgoing data buffer for the response (llm) by allocating the + * right amount of memory and copying the original information from the lsm + * structure. * - * Return total size of the buffer pointed by buf. + * Return total size of the buffer pointed by buf. */ static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) { @@ -386,7 +560,7 @@ static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) /* Copy common data */ cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; - cmd_ctx->llm->pid = cmd_ctx->lsm->pid; + cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; cmd_ctx->llm->data_size = size; cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; @@ -398,421 +572,1983 @@ error: } /* - * thread_manage_kconsumerd - * - * This thread manage the kconsumerd error sent - * back to the session daemon. + * Update the kernel poll set of all channel fd available over all tracing + * session. Add the wakeup pipe at the end of the set. */ -static void *thread_manage_kconsumerd(void *data) +static int update_kernel_poll(struct lttng_poll_event *events) { - int sock, ret; - enum lttcomm_return_code code; - - DBG("[thread] Manage kconsumerd started"); - - ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); - if (ret < 0) { - goto error; - } - - sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); - if (sock < 0) { - goto error; - } + int ret; + struct ltt_session *session; + struct ltt_kernel_channel *channel; - /* Getting status code from kconsumerd */ - ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); - if (ret <= 0) { - goto error; - } + DBG("Updating kernel poll set"); - if (code == KCONSUMERD_COMMAND_SOCK_READY) { - kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); - if (kconsumerd_cmd_sock < 0) { - sem_post(&kconsumerd_sem); - perror("kconsumerd connect"); - goto error; + session_lock_list(); + cds_list_for_each_entry(session, &session_list_ptr->head, list) { + session_lock(session); + if (session->kernel_session == NULL) { + session_unlock(session); + continue; } - /* Signal condition to tell that the kconsumerd is ready */ - sem_post(&kconsumerd_sem); - DBG("Kconsumerd command socket ready"); - } else { - DBG("Kconsumerd error when waiting for SOCK_READY : %s", - lttcomm_get_readable_code(-code)); - goto error; - } - /* Wait for any kconsumerd error */ - ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); - if (ret <= 0) { - ERR("Kconsumerd closed the command socket"); - goto error; + cds_list_for_each_entry(channel, + &session->kernel_session->channel_list.head, list) { + /* Add channel fd to the kernel poll set */ + ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); + if (ret < 0) { + session_unlock(session); + goto error; + } + DBG("Channel fd %d added to kernel set", channel->fd); + } + session_unlock(session); } + session_unlock_list(); - ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); + return 0; error: - kconsumerd_pid = 0; - DBG("Kconsumerd thread dying"); - return NULL; + session_unlock_list(); + return -1; } /* - * thread_manage_apps + * Find the channel fd from 'fd' over all tracing session. When found, check + * for new channel stream and send those stream fds to the kernel consumer. * - * This thread manage the application socket communication + * Useful for CPU hotplug feature. */ -static void *thread_manage_apps(void *data) +static int update_kernel_stream(int fd) { - int sock, ret; + int ret = 0; + struct ltt_session *session; + struct ltt_kernel_channel *channel; - /* TODO: Something more elegant is needed but fine for now */ - /* FIXME: change all types to either uint8_t, uint32_t, uint64_t - * for 32-bit vs 64-bit compat processes. */ - /* replicate in ust with version number */ - struct { - int reg; /* 1:register, 0:unregister */ - pid_t pid; - uid_t uid; - } reg_msg; + DBG("Updating kernel streams for channel fd %d", fd); - DBG("[thread] Manage apps started"); + session_lock_list(); + cds_list_for_each_entry(session, &session_list_ptr->head, list) { + session_lock(session); + if (session->kernel_session == NULL) { + session_unlock(session); + continue; + } - ret = lttcomm_listen_unix_sock(apps_sock); - if (ret < 0) { - goto error; + /* This is not suppose to be 0 but this is an extra security check */ + if (session->kernel_session->consumer_fd == 0) { + session->kernel_session->consumer_fd = kconsumerd_cmd_sock; + } + + cds_list_for_each_entry(channel, + &session->kernel_session->channel_list.head, list) { + if (channel->fd == fd) { + DBG("Channel found, updating kernel streams"); + ret = kernel_open_channel_stream(channel); + if (ret < 0) { + goto error; + } + + /* + * Have we already sent fds to the consumer? If yes, it means + * that tracing is started so it is safe to send our updated + * stream fds. + */ + if (session->kernel_session->kconsumer_fds_sent == 1) { + ret = send_kconsumerd_channel_fds( + session->kernel_session->consumer_fd, channel); + if (ret < 0) { + goto error; + } + } + goto error; + } + } + session_unlock(session); + } + session_unlock_list(); + return ret; + +error: + session_unlock(session); + session_unlock_list(); + return ret; +} + +/* + * This thread manage event coming from the kernel. + * + * Features supported in this thread: + * -) CPU Hotplug + */ +static void *thread_manage_kernel(void *data) +{ + int ret, i, pollfd, update_poll_flag = 1; + uint32_t revents, nb_fd; + char tmp; + struct lttng_poll_event events; + + DBG("Thread manage kernel started"); + + ret = create_thread_poll_set(&events, 2); + if (ret < 0) { + goto error; + } + + ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); + if (ret < 0) { + goto error; + } + + while (1) { + if (update_poll_flag == 1) { + /* + * Reset number of fd in the poll set. Always 2 since there is the thread + * quit pipe and the kernel pipe. + */ + events.nb_fd = 2; + + ret = update_kernel_poll(&events); + if (ret < 0) { + goto error; + } + update_poll_flag = 0; + } + + nb_fd = LTTNG_POLL_GETNB(&events); + + DBG("Thread kernel polling on %d fds", nb_fd); + + /* Zeroed the poll events */ + lttng_poll_reset(&events); + + /* Poll infinite value of time */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } else if (ret == 0) { + /* Should not happen since timeout is infinite */ + ERR("Return value of poll is 0 with an infinite timeout.\n" + "This should not have happened! Continuing..."); + continue; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Check for data on kernel pipe */ + if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { + ret = read(kernel_poll_pipe[0], &tmp, 1); + update_poll_flag = 1; + continue; + } else { + /* + * New CPU detected by the kernel. Adding kernel stream to + * kernel session and updating the kernel consumer + */ + if (revents & LPOLLIN) { + ret = update_kernel_stream(pollfd); + if (ret < 0) { + continue; + } + break; + /* + * TODO: We might want to handle the LPOLLERR | LPOLLHUP + * and unregister kernel stream at this point. + */ + } + } + } + } + +error: + DBG("Kernel thread dying"); + close(kernel_poll_pipe[0]); + close(kernel_poll_pipe[1]); + + lttng_poll_clean(&events); + + return NULL; +} + +/* + * This thread manage the kconsumerd error sent back to the session daemon. + */ +static void *thread_manage_kconsumerd(void *data) +{ + int sock = 0, i, ret, pollfd; + uint32_t revents, nb_fd; + enum lttcomm_return_code code; + struct lttng_poll_event events; + + DBG("[thread] Manage kconsumerd started"); + + ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); + if (ret < 0) { + goto error; + } + + /* + * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. + * Nothing more will be added to this poll set. + */ + ret = create_thread_poll_set(&events, 2); + if (ret < 0) { + goto error; + } + + ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); + if (ret < 0) { + goto error; + } + + nb_fd = LTTNG_POLL_GETNB(&events); + + /* Inifinite blocking call, waiting for transmission */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Event on the registration socket */ + if (pollfd == kconsumerd_err_sock) { + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + ERR("Kconsumerd err socket poll error"); + goto error; + } + } + } + + sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); + if (sock < 0) { + goto error; + } + + /* Getting status code from kconsumerd */ + ret = lttcomm_recv_unix_sock(sock, &code, + sizeof(enum lttcomm_return_code)); + if (ret <= 0) { + goto error; + } + + if (code == KCONSUMERD_COMMAND_SOCK_READY) { + kconsumerd_cmd_sock = + lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); + if (kconsumerd_cmd_sock < 0) { + sem_post(&kconsumerd_sem); + perror("kconsumerd connect"); + goto error; + } + /* Signal condition to tell that the kconsumerd is ready */ + sem_post(&kconsumerd_sem); + DBG("Kconsumerd command socket ready"); + } else { + DBG("Kconsumerd error when waiting for SOCK_READY : %s", + lttcomm_get_readable_code(-code)); + goto error; + } + + /* Remove the kconsumerd error sock since we've established a connexion */ + ret = lttng_poll_del(&events, kconsumerd_err_sock); + if (ret < 0) { + goto error; + } + + ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); + if (ret < 0) { + goto error; + } + + /* Update number of fd */ + nb_fd = LTTNG_POLL_GETNB(&events); + + /* Inifinite blocking call, waiting for transmission */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Event on the kconsumerd socket */ + if (pollfd == sock) { + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + ERR("Kconsumerd err socket second poll error"); + goto error; + } + } + } + + /* Wait for any kconsumerd error */ + ret = lttcomm_recv_unix_sock(sock, &code, + sizeof(enum lttcomm_return_code)); + if (ret <= 0) { + ERR("Kconsumerd closed the command socket"); + goto error; + } + + ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); + +error: + DBG("Kconsumerd thread dying"); + close(kconsumerd_err_sock); + close(kconsumerd_cmd_sock); + close(sock); + + unlink(kconsumerd_err_unix_sock_path); + unlink(kconsumerd_cmd_unix_sock_path); + kconsumerd_pid = 0; + + lttng_poll_clean(&events); + + return NULL; +} + +/* + * This thread manage application communication. + */ +static void *thread_manage_apps(void *data) +{ + int i, ret, pollfd; + uint32_t revents, nb_fd; + struct ust_command ust_cmd; + struct lttng_poll_event events; + + DBG("[thread] Manage application started"); + + ret = create_thread_poll_set(&events, 2); + if (ret < 0) { + goto error; + } + + ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); + if (ret < 0) { + goto error; + } + + while (1) { + /* Zeroed the events structure */ + lttng_poll_reset(&events); + + nb_fd = LTTNG_POLL_GETNB(&events); + + DBG("Apps thread polling on %d fds", nb_fd); + + /* Inifinite blocking call, waiting for transmission */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Inspect the apps cmd pipe */ + if (pollfd == apps_cmd_pipe[0]) { + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + ERR("Apps command pipe error"); + goto error; + } else if (revents & LPOLLIN) { + /* Empty pipe */ + ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); + if (ret < 0 || ret < sizeof(ust_cmd)) { + perror("read apps cmd pipe"); + goto error; + } + + /* Register applicaton to the session daemon */ + ret = ust_app_register(&ust_cmd.reg_msg, + ust_cmd.sock); + if (ret < 0) { + /* Only critical ENOMEM error can be returned here */ + goto error; + } + + ret = ustctl_register_done(ust_cmd.sock); + if (ret < 0) { + /* + * If the registration is not possible, we simply + * unregister the apps and continue + */ + ust_app_unregister(ust_cmd.sock); + } else { + /* + * We just need here to monitor the close of the UST + * socket and poll set monitor those by default. + */ + ret = lttng_poll_add(&events, ust_cmd.sock, 0); + if (ret < 0) { + goto error; + } + + DBG("Apps with sock %d added to poll set", + ust_cmd.sock); + } + break; + } + } else { + /* + * At this point, we know that a registered application made + * the event at poll_wait. + */ + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + /* Removing from the poll set */ + ret = lttng_poll_del(&events, pollfd); + if (ret < 0) { + goto error; + } + + /* Socket closed */ + ust_app_unregister(pollfd); + break; + } + } + } + } + +error: + DBG("Application communication apps dying"); + close(apps_cmd_pipe[0]); + close(apps_cmd_pipe[1]); + + lttng_poll_clean(&events); + + return NULL; +} + +/* + * Dispatch request from the registration threads to the application + * communication thread. + */ +static void *thread_dispatch_ust_registration(void *data) +{ + int ret; + struct cds_wfq_node *node; + struct ust_command *ust_cmd = NULL; + + DBG("[thread] Dispatch UST command started"); + + while (!dispatch_thread_exit) { + /* Atomically prepare the queue futex */ + futex_nto1_prepare(&ust_cmd_queue.futex); + + do { + /* Dequeue command for registration */ + node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); + if (node == NULL) { + DBG("Waked up but nothing in the UST command queue"); + /* Continue thread execution */ + break; + } + + ust_cmd = caa_container_of(node, struct ust_command, node); + + DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" + " gid:%d sock:%d name:%s (version %d.%d)", + ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, + ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, + ust_cmd->sock, ust_cmd->reg_msg.name, + ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); + /* + * Inform apps thread of the new application registration. This + * call is blocking so we can be assured that the data will be read + * at some point in time or wait to the end of the world :) + */ + ret = write(apps_cmd_pipe[1], ust_cmd, + sizeof(struct ust_command)); + if (ret < 0) { + perror("write apps cmd pipe"); + if (errno == EBADF) { + /* + * We can't inform the application thread to process + * registration. We will exit or else application + * registration will not occur and tracing will never + * start. + */ + goto error; + } + } + free(ust_cmd); + } while (node != NULL); + + /* Futex wait on queue. Blocking call on futex() */ + futex_nto1_wait(&ust_cmd_queue.futex); + } + +error: + DBG("Dispatch thread dying"); + return NULL; +} + +/* + * This thread manage application registration. + */ +static void *thread_registration_apps(void *data) +{ + int sock = 0, i, ret, pollfd; + uint32_t revents, nb_fd; + struct lttng_poll_event events; + /* + * Get allocated in this thread, enqueued to a global queue, dequeued and + * freed in the manage apps thread. + */ + struct ust_command *ust_cmd = NULL; + + DBG("[thread] Manage application registration started"); + + ret = lttcomm_listen_unix_sock(apps_sock); + if (ret < 0) { + goto error; + } + + /* + * Pass 2 as size here for the thread quit pipe and apps socket. Nothing + * more will be added to this poll set. + */ + ret = create_thread_poll_set(&events, 2); + if (ret < 0) { + goto error; + } + + /* Add the application registration socket */ + ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); + if (ret < 0) { + goto error; + } + + /* Notify all applications to register */ + ret = notify_ust_apps(1); + if (ret < 0) { + ERR("Failed to notify applications or create the wait shared memory.\n" + "Execution continues but there might be problem for already\n" + "running applications that wishes to register."); + } + + while (1) { + DBG("Accepting application registration"); + + nb_fd = LTTNG_POLL_GETNB(&events); + + /* Inifinite blocking call, waiting for transmission */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Event on the registration socket */ + if (pollfd == apps_sock) { + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + ERR("Register apps socket poll error"); + goto error; + } else if (revents & LPOLLIN) { + sock = lttcomm_accept_unix_sock(apps_sock); + if (sock < 0) { + goto error; + } + + /* Create UST registration command for enqueuing */ + ust_cmd = malloc(sizeof(struct ust_command)); + if (ust_cmd == NULL) { + perror("ust command malloc"); + goto error; + } + + /* + * Using message-based transmissions to ensure we don't + * have to deal with partially received messages. + */ + ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, + sizeof(struct ust_register_msg)); + if (ret < 0 || ret < sizeof(struct ust_register_msg)) { + if (ret < 0) { + perror("lttcomm_recv_unix_sock register apps"); + } else { + ERR("Wrong size received on apps register"); + } + free(ust_cmd); + close(sock); + continue; + } + + ust_cmd->sock = sock; + + DBG("UST registration received with pid:%d ppid:%d uid:%d" + " gid:%d sock:%d name:%s (version %d.%d)", + ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, + ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, + ust_cmd->sock, ust_cmd->reg_msg.name, + ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); + + /* + * Lock free enqueue the registration request. The red pill + * has been taken! This apps will be part of the *system*. + */ + cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); + + /* + * Wake the registration queue futex. Implicit memory + * barrier with the exchange in cds_wfq_enqueue. + */ + futex_nto1_wake(&ust_cmd_queue.futex); + } + } + } + } + +error: + DBG("UST Registration thread dying"); + + /* Notify that the registration thread is gone */ + notify_ust_apps(0); + + close(apps_sock); + close(sock); + unlink(apps_unix_sock_path); + + lttng_poll_clean(&events); + + return NULL; +} + +/* + * Start the thread_manage_kconsumerd. This must be done after a kconsumerd + * exec or it will fails. + */ +static int spawn_kconsumerd_thread(void) +{ + int ret; + + /* Setup semaphore */ + sem_init(&kconsumerd_sem, 0, 0); + + ret = pthread_create(&kconsumerd_thread, NULL, + thread_manage_kconsumerd, (void *) NULL); + if (ret != 0) { + perror("pthread_create kconsumerd"); + goto error; + } + + /* Wait for the kconsumerd thread to be ready */ + sem_wait(&kconsumerd_sem); + + if (kconsumerd_pid == 0) { + ERR("Kconsumerd did not start"); + goto error; + } + + return 0; + +error: + ret = LTTCOMM_KERN_CONSUMER_FAIL; + return ret; +} + +/* + * Join kernel consumer thread + */ +static int join_kconsumerd_thread(void) +{ + void *status; + int ret; + + if (kconsumerd_pid != 0) { + ret = kill(kconsumerd_pid, SIGTERM); + if (ret) { + ERR("Error killing kconsumerd"); + return ret; + } + return pthread_join(kconsumerd_thread, &status); + } else { + return 0; + } +} + +/* + * Fork and exec a kernel consumer daemon (kconsumerd). + * + * Return pid if successful else -1. + */ +static pid_t spawn_kconsumerd(void) +{ + int ret; + pid_t pid; + const char *verbosity; + + DBG("Spawning kconsumerd"); + + pid = fork(); + if (pid == 0) { + /* + * Exec kconsumerd. + */ + if (opt_verbose > 1 || opt_verbose_kconsumerd) { + verbosity = "--verbose"; + } else { + verbosity = "--quiet"; + } + execl(INSTALL_BIN_PATH "/ltt-kconsumerd", + "ltt-kconsumerd", verbosity, NULL); + if (errno != 0) { + perror("kernel start consumer exec"); + } + exit(EXIT_FAILURE); + } else if (pid > 0) { + ret = pid; + goto error; + } else { + perror("kernel start consumer fork"); + ret = -errno; + goto error; + } + +error: + return ret; +} + +/* + * Spawn the kconsumerd daemon and session daemon thread. + */ +static int start_kconsumerd(void) +{ + int ret; + + pthread_mutex_lock(&kconsumerd_pid_mutex); + if (kconsumerd_pid != 0) { + pthread_mutex_unlock(&kconsumerd_pid_mutex); + goto end; + } + + ret = spawn_kconsumerd(); + if (ret < 0) { + ERR("Spawning kconsumerd failed"); + ret = LTTCOMM_KERN_CONSUMER_FAIL; + pthread_mutex_unlock(&kconsumerd_pid_mutex); + goto error; + } + + /* Setting up the global kconsumerd_pid */ + kconsumerd_pid = ret; + pthread_mutex_unlock(&kconsumerd_pid_mutex); + + DBG("Kconsumerd pid %d", ret); + + DBG("Spawning kconsumerd thread"); + ret = spawn_kconsumerd_thread(); + if (ret < 0) { + ERR("Fatal error spawning kconsumerd thread"); + goto error; + } + +end: + return 0; + +error: + return ret; +} + +/* + * modprobe_kernel_modules + */ +static int modprobe_kernel_modules(void) +{ + int ret = 0, i; + char modprobe[256]; + + for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { + ret = snprintf(modprobe, sizeof(modprobe), + "/sbin/modprobe %s%s", + kernel_modules_list[i].required ? "" : "--quiet ", + kernel_modules_list[i].name); + if (ret < 0) { + perror("snprintf modprobe"); + goto error; + } + modprobe[sizeof(modprobe) - 1] = '\0'; + ret = system(modprobe); + if (ret == -1) { + ERR("Unable to launch modprobe for module %s", + kernel_modules_list[i].name); + } else if (kernel_modules_list[i].required + && WEXITSTATUS(ret) != 0) { + ERR("Unable to load module %s", + kernel_modules_list[i].name); + } else { + DBG("Modprobe successfully %s", + kernel_modules_list[i].name); + } + } + +error: + return ret; +} + +/* + * mount_debugfs + */ +static int mount_debugfs(char *path) +{ + int ret; + char *type = "debugfs"; + + ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); + if (ret < 0) { + PERROR("Cannot create debugfs path"); + goto error; + } + + ret = mount(type, path, type, 0, NULL); + if (ret < 0) { + PERROR("Cannot mount debugfs"); + goto error; + } + + DBG("Mounted debugfs successfully at %s", path); + +error: + return ret; +} + +/* + * Setup necessary data for kernel tracer action. + */ +static void init_kernel_tracer(void) +{ + int ret; + char *proc_mounts = "/proc/mounts"; + char line[256]; + char *debugfs_path = NULL, *lttng_path = NULL; + FILE *fp; + + /* Detect debugfs */ + fp = fopen(proc_mounts, "r"); + if (fp == NULL) { + ERR("Unable to probe %s", proc_mounts); + goto error; + } + + while (fgets(line, sizeof(line), fp) != NULL) { + if (strstr(line, "debugfs") != NULL) { + /* Remove first string */ + strtok(line, " "); + /* Dup string here so we can reuse line later on */ + debugfs_path = strdup(strtok(NULL, " ")); + DBG("Got debugfs path : %s", debugfs_path); + break; + } + } + + fclose(fp); + + /* Mount debugfs if needded */ + if (debugfs_path == NULL) { + ret = asprintf(&debugfs_path, "/mnt/debugfs"); + if (ret < 0) { + perror("asprintf debugfs path"); + goto error; + } + ret = mount_debugfs(debugfs_path); + if (ret < 0) { + perror("Cannot mount debugfs"); + goto error; + } + } + + /* Modprobe lttng kernel modules */ + ret = modprobe_kernel_modules(); + if (ret < 0) { + goto error; + } + + /* Setup lttng kernel path */ + ret = asprintf(<tng_path, "%s/lttng", debugfs_path); + if (ret < 0) { + perror("asprintf lttng path"); + goto error; + } + + /* Open debugfs lttng */ + kernel_tracer_fd = open(lttng_path, O_RDWR); + if (kernel_tracer_fd < 0) { + DBG("Failed to open %s", lttng_path); + goto error; + } + + free(lttng_path); + free(debugfs_path); + DBG("Kernel tracer fd %d", kernel_tracer_fd); + return; + +error: + if (lttng_path) { + free(lttng_path); + } + if (debugfs_path) { + free(debugfs_path); + } + WARN("No kernel tracer available"); + kernel_tracer_fd = 0; + return; +} + +/* + * Init tracing by creating trace directory and sending fds kernel consumer. + */ +static int init_kernel_tracing(struct ltt_kernel_session *session) +{ + int ret = 0; + + if (session->kconsumer_fds_sent == 0) { + /* + * Assign default kernel consumer socket if no consumer assigned to the + * kernel session. At this point, it's NOT suppose to be 0 but this is + * an extra security check. + */ + if (session->consumer_fd == 0) { + session->consumer_fd = kconsumerd_cmd_sock; + } + + ret = send_kconsumerd_fds(session); + if (ret < 0) { + ret = LTTCOMM_KERN_CONSUMER_FAIL; + goto error; + } + + session->kconsumer_fds_sent = 1; + } + +error: + return ret; +} + +/* + * Create an UST session and add it to the session ust list. + */ +static int create_ust_session(struct ltt_session *session, + struct lttng_domain *domain) +{ + int ret; + struct ltt_ust_session *lus = NULL; + struct ust_app *app; + + switch (domain->type) { + case LTTNG_DOMAIN_UST_PID: + app = ust_app_get_by_pid(domain->attr.pid); + if (app == NULL) { + ret = LTTCOMM_APP_NOT_FOUND; + goto error; + } + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + goto error; + } + + DBG("Creating UST session"); + + lus = trace_ust_create_session(session->path, domain->attr.pid, domain); + if (lus == NULL) { + ret = LTTCOMM_UST_SESS_FAIL; + goto error; + } + + ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, + geteuid(), allowed_group()); + if (ret < 0) { + if (ret != -EEXIST) { + ERR("Trace directory creation error"); + ret = LTTCOMM_UST_SESS_FAIL; + goto error; + } + } + + /* Create session on the UST tracer */ + ret = ustctl_create_session(app->sock, lus); + if (ret < 0) { + ret = LTTCOMM_UST_SESS_FAIL; + goto error; + } + + cds_list_add(&lus->list, &session->ust_session_list.head); + session->ust_session_list.count++; + + return LTTCOMM_OK; + +error: + free(lus); + return ret; +} + +/* + * Create a kernel tracer session then create the default channel. + */ +static int create_kernel_session(struct ltt_session *session) +{ + int ret; + + DBG("Creating kernel session"); + + ret = kernel_create_session(session, kernel_tracer_fd); + if (ret < 0) { + ret = LTTCOMM_KERN_SESS_FAIL; + goto error; + } + + /* Set kernel consumer socket fd */ + if (kconsumerd_cmd_sock) { + session->kernel_session->consumer_fd = kconsumerd_cmd_sock; + } + + ret = mkdir_recursive(session->kernel_session->trace_path, + S_IRWXU | S_IRWXG, geteuid(), allowed_group()); + if (ret < 0) { + if (ret != -EEXIST) { + ERR("Trace directory creation error"); + goto error; + } + } + +error: + return ret; +} + +/* + * Using the session list, filled a lttng_session array to send back to the + * client for session listing. + * + * The session list lock MUST be acquired before calling this function. Use + * session_lock_list() and session_unlock_list(). + */ +static void list_lttng_sessions(struct lttng_session *sessions) +{ + int i = 0; + struct ltt_session *session; + + DBG("Getting all available session"); + /* + * Iterate over session list and append data after the control struct in + * the buffer. + */ + cds_list_for_each_entry(session, &session_list_ptr->head, list) { + strncpy(sessions[i].path, session->path, PATH_MAX); + sessions[i].path[PATH_MAX - 1] = '\0'; + strncpy(sessions[i].name, session->name, NAME_MAX); + sessions[i].name[NAME_MAX - 1] = '\0'; + i++; + } +} + +/* + * Fill lttng_channel array of all channels. + */ +static void list_lttng_channels(struct ltt_session *session, + struct lttng_channel *channels) +{ + int i = 0; + struct ltt_kernel_channel *kchan; + + DBG("Listing channels for session %s", session->name); + + /* Kernel channels */ + if (session->kernel_session != NULL) { + cds_list_for_each_entry(kchan, + &session->kernel_session->channel_list.head, list) { + /* Copy lttng_channel struct to array */ + memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); + channels[i].enabled = kchan->enabled; + i++; + } + } + + /* TODO: Missing UST listing */ +} + +/* + * Fill lttng_event array of all events in the channel. + */ +static void list_lttng_events(struct ltt_kernel_channel *kchan, + struct lttng_event *events) +{ + /* + * TODO: This is ONLY kernel. Need UST support. + */ + int i = 0; + struct ltt_kernel_event *event; + + DBG("Listing events for channel %s", kchan->channel->name); + + /* Kernel channels */ + cds_list_for_each_entry(event, &kchan->events_list.head , list) { + strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); + events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; + events[i].enabled = event->enabled; + switch (event->event->instrumentation) { + case LTTNG_KERNEL_TRACEPOINT: + events[i].type = LTTNG_EVENT_TRACEPOINT; + break; + case LTTNG_KERNEL_KPROBE: + case LTTNG_KERNEL_KRETPROBE: + events[i].type = LTTNG_EVENT_PROBE; + memcpy(&events[i].attr.probe, &event->event->u.kprobe, + sizeof(struct lttng_kernel_kprobe)); + break; + case LTTNG_KERNEL_FUNCTION: + events[i].type = LTTNG_EVENT_FUNCTION; + memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, + sizeof(struct lttng_kernel_function)); + break; + case LTTNG_KERNEL_NOOP: + events[i].type = LTTNG_EVENT_NOOP; + break; + case LTTNG_KERNEL_SYSCALL: + events[i].type = LTTNG_EVENT_SYSCALL; + break; + case LTTNG_KERNEL_ALL: + assert(0); + break; + } + i++; + } +} + +/* + * Command LTTNG_DISABLE_CHANNEL processed by the client thread. + */ +static int cmd_disable_channel(struct ltt_session *session, + int domain, char *channel_name) +{ + int ret; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + ret = channel_kernel_disable(session->kernel_session, + channel_name); + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + case LTTNG_DOMAIN_UST_PID: + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + goto error; + } + + ret = LTTCOMM_OK; + +error: + return ret; +} + +/* + * Copy channel from attributes and set it in the application channel list. + */ +static int copy_ust_channel_to_app(struct ltt_ust_session *usess, + struct lttng_channel *attr, struct ust_app *app) +{ + int ret; + struct ltt_ust_channel *uchan, *new_chan; + + uchan = trace_ust_get_channel_by_name(attr->name, usess); + if (uchan == NULL) { + ret = LTTCOMM_FATAL; + goto error; + } + + new_chan = trace_ust_create_channel(attr, usess->path); + if (new_chan == NULL) { + PERROR("malloc ltt_ust_channel"); + ret = LTTCOMM_FATAL; + goto error; + } + + ret = channel_ust_copy(new_chan, uchan); + if (ret < 0) { + ret = LTTCOMM_FATAL; + goto error; + } + + /* Add channel to the ust app channel list */ + cds_list_add(&new_chan->list, &app->channels.head); + app->channels.count++; + +error: + return ret; +} + +/* + * Command LTTNG_ENABLE_CHANNEL processed by the client thread. + */ +static int cmd_enable_channel(struct ltt_session *session, + struct lttng_domain *domain, struct lttng_channel *attr) +{ + int ret; + + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + { + struct ltt_kernel_channel *kchan; + + kchan = trace_kernel_get_channel_by_name(attr->name, + session->kernel_session); + if (kchan == NULL) { + ret = channel_kernel_create(session->kernel_session, + attr, kernel_poll_pipe[1]); + } else { + ret = channel_kernel_enable(session->kernel_session, kchan); + } + + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + } + case LTTNG_DOMAIN_UST_PID: + { + int sock; + struct ltt_ust_channel *uchan; + struct ltt_ust_session *usess; + struct ust_app *app; + + usess = trace_ust_get_session_by_pid(&session->ust_session_list, + domain->attr.pid); + if (usess == NULL) { + ret = LTTCOMM_UST_CHAN_NOT_FOUND; + goto error; + } + + app = ust_app_get_by_pid(domain->attr.pid); + if (app == NULL) { + ret = LTTCOMM_APP_NOT_FOUND; + goto error; + } + sock = app->sock; + + uchan = trace_ust_get_channel_by_name(attr->name, usess); + if (uchan == NULL) { + ret = channel_ust_create(usess, attr, sock); + } else { + ret = channel_ust_enable(usess, uchan, sock); + } + + if (ret != LTTCOMM_OK) { + goto error; + } + + ret = copy_ust_channel_to_app(usess, attr, app); + if (ret != LTTCOMM_OK) { + goto error; + } + + DBG("UST channel %s created for app sock %d with pid %d", + attr->name, app->sock, domain->attr.pid); + break; + } + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + goto error; + } + + ret = LTTCOMM_OK; + +error: + return ret; +} + +/* + * Command LTTNG_DISABLE_EVENT processed by the client thread. + */ +static int cmd_disable_event(struct ltt_session *session, int domain, + char *channel_name, char *event_name) +{ + int ret; + struct ltt_kernel_channel *kchan; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + ret = LTTCOMM_KERN_CHAN_NOT_FOUND; + goto error; + } + + ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; + } + + ret = LTTCOMM_OK; + +error: + return ret; +} + +/* + * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. + */ +static int cmd_disable_event_all(struct ltt_session *session, int domain, + char *channel_name) +{ + int ret; + struct ltt_kernel_channel *kchan; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + ret = LTTCOMM_KERN_CHAN_NOT_FOUND; + goto error; + } + + ret = event_kernel_disable_all(session->kernel_session, kchan); + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; } - /* Notify all applications to register */ - notify_apps(default_global_apps_pipe); + ret = LTTCOMM_OK; - while (1) { - DBG("Accepting application registration"); - /* Blocking call, waiting for transmission */ - sock = lttcomm_accept_unix_sock(apps_sock); - if (sock < 0) { +error: + return ret; +} + +/* + * Command LTTNG_ADD_CONTEXT processed by the client thread. + */ +static int cmd_add_context(struct ltt_session *session, int domain, + char *channel_name, char *event_name, struct lttng_event_context *ctx) +{ + int ret; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + /* Add kernel context to kernel tracer */ + ret = context_kernel_add(session->kernel_session, ctx, + event_name, channel_name); + if (ret != LTTCOMM_OK) { goto error; } - /* Basic recv here to handle the very simple data - * that the libust send to register (reg_msg). - */ - ret = recv(sock, ®_msg, sizeof(reg_msg), 0); - if (ret < 0) { - perror("recv"); - continue; - } + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; + } - /* Add application to the global traceable list */ - if (reg_msg.reg == 1) { - /* Registering */ - ret = register_traceable_app(reg_msg.pid, reg_msg.uid); - if (ret < 0) { - /* register_traceable_app only return an error with - * ENOMEM. At this point, we better stop everything. - */ + ret = LTTCOMM_OK; + +error: + return ret; +} + +/* + * Command LTTNG_ENABLE_EVENT processed by the client thread. + */ +static int cmd_enable_event(struct ltt_session *session, int domain, + char *channel_name, struct lttng_event *event) +{ + int ret; + struct ltt_kernel_channel *kchan; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + /* This call will notify the kernel thread */ + ret = channel_kernel_create(session->kernel_session, + NULL, kernel_poll_pipe[1]); + if (ret != LTTCOMM_OK) { goto error; } - } else { - /* Unregistering */ - unregister_traceable_app(reg_msg.pid); } + + /* Get the newly created kernel channel pointer */ + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + /* This sould not happen... */ + ret = LTTCOMM_FATAL; + goto error; + } + + ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event); + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; } -error: + ret = LTTCOMM_OK; - return NULL; +error: + return ret; } /* - * spawn_kconsumerd_thread - * - * Start the thread_manage_kconsumerd. This must be done after a kconsumerd - * exec or it will fails. + * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. */ -static int spawn_kconsumerd_thread(void) +static int cmd_enable_event_all(struct ltt_session *session, int domain, + char *channel_name, int event_type) { int ret; + struct ltt_kernel_channel *kchan; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + /* This call will notify the kernel thread */ + ret = channel_kernel_create(session->kernel_session, NULL, + kernel_poll_pipe[1]); + if (ret != LTTCOMM_OK) { + goto error; + } + } - /* Setup semaphore */ - sem_init(&kconsumerd_sem, 0, 0); + /* Get the newly created kernel channel pointer */ + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + /* This sould not happen... */ + ret = LTTCOMM_FATAL; + goto error; + } - ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); - if (ret != 0) { - perror("pthread_create kconsumerd"); + switch (event_type) { + case LTTNG_KERNEL_SYSCALL: + ret = event_kernel_enable_all_syscalls(session->kernel_session, + kchan, kernel_tracer_fd); + break; + case LTTNG_KERNEL_TRACEPOINT: + /* + * This call enables all LTTNG_KERNEL_TRACEPOINTS and + * events already registered to the channel. + */ + ret = event_kernel_enable_all_tracepoints(session->kernel_session, + kchan, kernel_tracer_fd); + break; + case LTTNG_KERNEL_ALL: + /* Enable syscalls and tracepoints */ + ret = event_kernel_enable_all(session->kernel_session, + kchan, kernel_tracer_fd); + break; + default: + ret = LTTCOMM_KERN_ENABLE_FAIL; + goto error; + } + if (ret != LTTCOMM_OK) { + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; goto error; } - /* Wait for the kconsumerd thread to be ready */ - sem_wait(&kconsumerd_sem); + ret = LTTCOMM_OK; - if (kconsumerd_pid == 0) { - ERR("Kconsumerd did not start"); +error: + return ret; +} + +/* + * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. + */ +static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) +{ + int ret; + ssize_t nb_events = 0; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + nb_events = kernel_list_events(kernel_tracer_fd, events); + if (nb_events < 0) { + ret = LTTCOMM_KERN_LIST_FAIL; + goto error; + } + break; + default: + /* TODO: Userspace listing */ + ret = LTTCOMM_NOT_IMPLEMENTED; goto error; } - return 0; + return nb_events; error: - ret = LTTCOMM_KERN_CONSUMER_FAIL; - return ret; + /* Return negative value to differentiate return code */ + return -ret; } /* - * spawn_kconsumerd - * - * Fork and exec a kernel consumer daemon (kconsumerd). - * - * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel - * file descriptor using the libkernelctl or kernel-ctl functions. So, a - * kernel consumer MUST only be spawned before creating a kernel session. - * - * Return pid if successful else -1. + * Command LTTNG_START_TRACE processed by the client thread. */ -static pid_t spawn_kconsumerd(void) +static int cmd_start_trace(struct ltt_session *session) { int ret; - pid_t pid; + struct ltt_kernel_channel *kchan; + struct ltt_kernel_session *ksession; - DBG("Spawning kconsumerd"); + /* Short cut */ + ksession = session->kernel_session; - pid = fork(); - if (pid == 0) { - /* - * Exec kconsumerd. - */ - execlp("kconsumerd", "kconsumerd", "--verbose", NULL); - if (errno != 0) { - perror("kernel start consumer exec"); + /* Kernel tracing */ + if (ksession != NULL) { + /* Open kernel metadata */ + if (ksession->metadata == NULL) { + ret = kernel_open_metadata(ksession, ksession->trace_path); + if (ret < 0) { + ret = LTTCOMM_KERN_META_FAIL; + goto error; + } } - exit(EXIT_FAILURE); - } else if (pid > 0) { - ret = pid; - goto error; - } else { - perror("kernel start consumer fork"); - ret = -errno; - goto error; + + /* Open kernel metadata stream */ + if (ksession->metadata_stream_fd == 0) { + ret = kernel_open_metadata_stream(ksession); + if (ret < 0) { + ERR("Kernel create metadata stream failed"); + ret = LTTCOMM_KERN_STREAM_FAIL; + goto error; + } + } + + /* For each channel */ + cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { + if (kchan->stream_count == 0) { + ret = kernel_open_channel_stream(kchan); + if (ret < 0) { + ret = LTTCOMM_KERN_STREAM_FAIL; + goto error; + } + /* Update the stream global counter */ + ksession->stream_count_global += ret; + } + } + + /* Setup kernel consumer socket and send fds to it */ + ret = init_kernel_tracing(ksession); + if (ret < 0) { + ret = LTTCOMM_KERN_START_FAIL; + goto error; + } + + /* This start the kernel tracing */ + ret = kernel_start_session(ksession); + if (ret < 0) { + ret = LTTCOMM_KERN_START_FAIL; + goto error; + } + + /* Quiescent wait after starting trace */ + kernel_wait_quiescent(kernel_tracer_fd); } + /* TODO: Start all UST traces */ + + ret = LTTCOMM_OK; + error: return ret; } /* - * start_kconsumerd - * - * Spawn the kconsumerd daemon and session daemon thread. + * Command LTTNG_STOP_TRACE processed by the client thread. */ -static int start_kconsumerd(void) +static int cmd_stop_trace(struct ltt_session *session) { int ret; + struct ltt_kernel_channel *kchan; + struct ltt_kernel_session *ksession; - pthread_mutex_lock(&kconsumerd_pid_mutex); - if (kconsumerd_pid != 0) { - goto end; - } + /* Short cut */ + ksession = session->kernel_session; - ret = spawn_kconsumerd(); - if (ret < 0) { - ERR("Spawning kconsumerd failed"); - ret = LTTCOMM_KERN_CONSUMER_FAIL; - pthread_mutex_unlock(&kconsumerd_pid_mutex); - goto error; + /* Kernel tracer */ + if (ksession != NULL) { + DBG("Stop kernel tracing"); + + /* Flush all buffers before stopping */ + ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); + if (ret < 0) { + ERR("Kernel metadata flush failed"); + } + + cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { + ret = kernel_flush_buffer(kchan); + if (ret < 0) { + ERR("Kernel flush buffer error"); + } + } + + ret = kernel_stop_session(ksession); + if (ret < 0) { + ret = LTTCOMM_KERN_STOP_FAIL; + goto error; + } + + kernel_wait_quiescent(kernel_tracer_fd); } - /* Setting up the global kconsumerd_pid */ - kconsumerd_pid = ret; - pthread_mutex_unlock(&kconsumerd_pid_mutex); + /* TODO : User-space tracer */ - DBG("Kconsumerd pid %d", ret); + ret = LTTCOMM_OK; - DBG("Spawning kconsumerd thread"); - ret = spawn_kconsumerd_thread(); - if (ret < 0) { - ERR("Fatal error spawning kconsumerd thread"); +error: + return ret; +} + +/* + * Command LTTNG_CREATE_SESSION processed by the client thread. + */ +static int cmd_create_session(char *name, char *path) +{ + int ret; + + ret = session_create(name, path); + if (ret != LTTCOMM_OK) { goto error; } -end: - pthread_mutex_unlock(&kconsumerd_pid_mutex); - return 0; + ret = LTTCOMM_OK; error: return ret; } /* - * init_kernel_tracer - * - * Setup necessary data for kernel tracer action. + * Command LTTNG_DESTROY_SESSION processed by the client thread. */ -static void init_kernel_tracer(void) +static int cmd_destroy_session(struct ltt_session *session, char *name) { - /* Set the global kernel tracer fd */ - kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR); - if (kernel_tracer_fd < 0) { - WARN("No kernel tracer available"); - kernel_tracer_fd = 0; + int ret; + + /* Clean kernel session teardown */ + teardown_kernel_session(session); + + /* + * Must notify the kernel thread here to update it's poll setin order + * to remove the channel(s)' fd just destroyed. + */ + ret = notify_thread_pipe(kernel_poll_pipe[1]); + if (ret < 0) { + perror("write kernel poll pipe"); } - DBG("Kernel tracer fd %d", kernel_tracer_fd); + ret = session_destroy(session); + + return ret; } /* - * start_kernel_trace - * - * Start tracing by creating trace directory and sending FDs to the kernel - * consumer. + * Command LTTNG_CALIBRATE processed by the client thread. */ -static int start_kernel_trace(struct ltt_kernel_session *session) +static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) { int ret; - /* Create trace directory */ - ret = create_trace_dir(session); - if (ret < 0) { - if (ret == -EEXIST) { - ret = LTTCOMM_KERN_DIR_EXIST; - } else { - ret = LTTCOMM_KERN_DIR_FAIL; + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + { + struct lttng_kernel_calibrate kcalibrate; + + kcalibrate.type = calibrate->type; + ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); + if (ret < 0) { + ret = LTTCOMM_KERN_ENABLE_FAIL; goto error; } + break; + } + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; } - if (session->kconsumer_fds_sent == 0) { - ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); - if (ret < 0) { - ERR("Send kconsumerd fds failed"); + ret = LTTCOMM_OK; + +error: + return ret; +} + +/* + * Command LTTNG_REGISTER_CONSUMER processed by the client thread. + */ +static int cmd_register_consumer(struct ltt_session *session, int domain, + char *sock_path) +{ + int ret, sock; + + switch (domain) { + case LTTNG_DOMAIN_KERNEL: + /* Can't register a consumer if there is already one */ + if (session->kernel_session->consumer_fd != 0) { ret = LTTCOMM_KERN_CONSUMER_FAIL; goto error; } - session->kconsumer_fds_sent = 1; + sock = lttcomm_connect_unix_sock(sock_path); + if (sock < 0) { + ret = LTTCOMM_CONNECT_FAIL; + goto error; + } + + session->kernel_session->consumer_fd = sock; + break; + default: + /* TODO: Userspace tracing */ + ret = LTTCOMM_NOT_IMPLEMENTED; + goto error; } + ret = LTTCOMM_OK; + error: return ret; } /* - * init_default_channel - * - * Allocate a channel structure and fill it. + * Command LTTNG_LIST_DOMAINS processed by the client thread. + */ +static ssize_t cmd_list_domains(struct ltt_session *session, + struct lttng_domain **domains) +{ + int ret; + ssize_t nb_dom = 0; + + if (session->kernel_session != NULL) { + nb_dom++; + } + + nb_dom += session->ust_session_list.count; + + *domains = malloc(nb_dom * sizeof(struct lttng_domain)); + if (*domains == NULL) { + ret = -LTTCOMM_FATAL; + goto error; + } + + (*domains)[0].type = LTTNG_DOMAIN_KERNEL; + + /* TODO: User-space tracer domain support */ + + return nb_dom; + +error: + return ret; +} + +/* + * Command LTTNG_LIST_CHANNELS processed by the client thread. */ -static struct lttng_channel *init_default_channel(void) +static ssize_t cmd_list_channels(struct ltt_session *session, + struct lttng_channel **channels) { - struct lttng_channel *chan; + int ret; + ssize_t nb_chan = 0; - chan = malloc(sizeof(struct lttng_channel)); - if (chan == NULL) { - perror("init channel malloc"); - goto error; + if (session->kernel_session != NULL) { + nb_chan += session->kernel_session->channel_count; } - if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) { - perror("snprintf defautl channel name"); - return NULL; + *channels = malloc(nb_chan * sizeof(struct lttng_channel)); + if (*channels == NULL) { + ret = -LTTCOMM_FATAL; + goto error; } - chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; - chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; - chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; - chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; - chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; + list_lttng_channels(session, *channels); + + return nb_chan; error: - return chan; + return ret; } /* - * create_kernel_session - * - * Create a kernel tracer session then create the default channel. + * Command LTTNG_LIST_EVENTS processed by the client thread. */ -static int create_kernel_session(struct ltt_session *session) +static ssize_t cmd_list_events(struct ltt_session *session, + char *channel_name, struct lttng_event **events) { int ret; - struct lttng_channel *chan; + ssize_t nb_event = 0; + struct ltt_kernel_channel *kchan = NULL; - DBG("Creating kernel session"); - - ret = kernel_create_session(session, kernel_tracer_fd); - if (ret < 0) { - ret = LTTCOMM_KERN_SESS_FAIL; - goto error; + if (session->kernel_session != NULL) { + kchan = trace_kernel_get_channel_by_name(channel_name, + session->kernel_session); + if (kchan == NULL) { + ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; + goto error; + } + nb_event += kchan->event_count; } - chan = init_default_channel(); - if (chan == NULL) { - ret = LTTCOMM_FATAL; + *events = malloc(nb_event * sizeof(struct lttng_event)); + if (*events == NULL) { + ret = -LTTCOMM_FATAL; goto error; } - DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME); + list_lttng_events(kchan, *events); - ret = kernel_create_channel(session->kernel_session, chan); - if (ret < 0) { - ret = LTTCOMM_KERN_CHAN_FAIL; - goto error; - } + /* TODO: User-space tracer support */ + + return nb_event; error: return ret; } /* - * process_client_msg + * Process the command requested by the lttng client within the command + * context structure. This function make sure that the return structure (llm) + * is set and ready for transmission before returning. * - * Process the command requested by the lttng client within the command - * context structure. This function make sure that the return structure (llm) - * is set and ready for transmission before returning. - * - * Return any error encountered or 0 for success. + * Return any error encountered or 0 for success. */ static int process_client_msg(struct command_ctx *cmd_ctx) { - int ret; + int ret = LTTCOMM_OK; + int need_tracing_session = 1; DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); - /* Listing commands don't need a session */ + /* + * Check for command that don't needs to allocate a returned payload. We do + * this here so we don't have to make the call for no payload at each + * command. + */ + switch(cmd_ctx->lsm->cmd_type) { + case LTTNG_LIST_SESSIONS: + case LTTNG_LIST_TRACEPOINTS: + case LTTNG_LIST_DOMAINS: + case LTTNG_LIST_CHANNELS: + case LTTNG_LIST_EVENTS: + break; + default: + /* Setup lttng message with no payload */ + ret = setup_lttng_msg(cmd_ctx, 0); + if (ret < 0) { + /* This label does not try to unlock the session */ + goto init_setup_error; + } + } + + /* Commands that DO NOT need a session. */ switch (cmd_ctx->lsm->cmd_type) { + case LTTNG_CALIBRATE: case LTTNG_CREATE_SESSION: case LTTNG_LIST_SESSIONS: - case LTTNG_LIST_EVENTS: - case LTTNG_KERNEL_LIST_EVENTS: - case LTTNG_LIST_TRACEABLE_APPS: + case LTTNG_LIST_TRACEPOINTS: + need_tracing_session = 0; break; default: - DBG("Getting session %s by name", cmd_ctx->lsm->session_name); - cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name); + DBG("Getting session %s by name", cmd_ctx->lsm->session.name); + cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); if (cmd_ctx->session == NULL) { - /* If session name not found */ - if (cmd_ctx->lsm->session_name != NULL) { + if (cmd_ctx->lsm->session.name != NULL) { ret = LTTCOMM_SESS_NOT_FOUND; - } else { /* If no session name specified */ + } else { + /* If no session name specified */ ret = LTTCOMM_SELECT_SESS; } goto error; + } else { + /* Acquire lock for the session */ + session_lock(cmd_ctx->session); } break; } /* - * Check kernel command for kernel session. + * Check domain type for specific "pre-action". */ - switch (cmd_ctx->lsm->cmd_type) { - case LTTNG_KERNEL_CREATE_CHANNEL: - case LTTNG_KERNEL_DISABLE_ALL_EVENT: - case LTTNG_KERNEL_DISABLE_CHANNEL: - case LTTNG_KERNEL_DISABLE_EVENT: - case LTTNG_KERNEL_ENABLE_ALL_EVENT: - case LTTNG_KERNEL_ENABLE_CHANNEL: - case LTTNG_KERNEL_ENABLE_EVENT: - case LTTNG_KERNEL_LIST_EVENTS: + switch (cmd_ctx->lsm->domain.type) { + case LTTNG_DOMAIN_KERNEL: /* Kernel tracer check */ if (kernel_tracer_fd == 0) { + /* Basically, load kernel tracer modules */ init_kernel_tracer(); if (kernel_tracer_fd == 0) { ret = LTTCOMM_KERN_NA; @@ -821,535 +2557,273 @@ static int process_client_msg(struct command_ctx *cmd_ctx) } /* Need a session for kernel command */ - if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS && - cmd_ctx->session->kernel_session == NULL) { - - ret = create_kernel_session(cmd_ctx->session); - if (ret < 0) { - ret = LTTCOMM_KERN_SESS_FAIL; - goto error; + if (need_tracing_session) { + if (cmd_ctx->session->kernel_session == NULL) { + ret = create_kernel_session(cmd_ctx->session); + if (ret < 0) { + ret = LTTCOMM_KERN_SESS_FAIL; + goto error; + } } /* Start the kernel consumer daemon */ - if (kconsumerd_pid == 0) { + if (kconsumerd_pid == 0 && + cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { ret = start_kconsumerd(); if (ret < 0) { + ret = LTTCOMM_KERN_CONSUMER_FAIL; goto error; } } } - } - - /* Connect to ust apps if available pid */ - if (cmd_ctx->lsm->pid > 0) { - /* Connect to app using ustctl API */ - cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid); - if (cmd_ctx->ust_sock < 0) { - ret = LTTCOMM_NO_TRACEABLE; - goto error; - } - } - - /* Process by command type */ - switch (cmd_ctx->lsm->cmd_type) { - case LTTNG_KERNEL_CREATE_CHANNEL: - { - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - /* Kernel tracer */ - DBG("Creating kernel channel"); - - ret = kernel_create_channel(cmd_ctx->session->kernel_session, - &cmd_ctx->lsm->u.channel.chan); - if (ret < 0) { - ret = LTTCOMM_KERN_CHAN_FAIL; - goto error; - } - - ret = LTTCOMM_OK; break; - } - case LTTNG_KERNEL_DISABLE_EVENT: + case LTTNG_DOMAIN_UST_PID: { - struct ltt_kernel_channel *chan; - struct ltt_kernel_event *ev; - - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, - cmd_ctx->session->kernel_session); - if (chan == NULL) { - ret = LTTCOMM_KERN_CHAN_NOT_FOUND; - goto error; - } - - ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan); - if (ev != NULL) { - DBG("Disabling kernel event %s for channel %s.", - cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name); - ret = kernel_disable_event(ev); - if (ret < 0) { - ret = LTTCOMM_KERN_ENABLE_FAIL; - goto error; + struct ltt_ust_session *usess; + + if (need_tracing_session) { + usess = trace_ust_get_session_by_pid( + &cmd_ctx->session->ust_session_list, + cmd_ctx->lsm->domain.attr.pid); + if (usess == NULL) { + ret = create_ust_session(cmd_ctx->session, + &cmd_ctx->lsm->domain); + if (ret != LTTCOMM_OK) { + goto error; + } } } - - kernel_wait_quiescent(kernel_tracer_fd); - ret = LTTCOMM_OK; break; } - case LTTNG_KERNEL_DISABLE_ALL_EVENT: - { - struct ltt_kernel_channel *chan; - struct ltt_kernel_event *ev; - - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - DBG("Disabling all enabled kernel events"); - - chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, - cmd_ctx->session->kernel_session); - if (chan == NULL) { - ret = LTTCOMM_KERN_CHAN_NOT_FOUND; - goto error; - } - - /* For each event in the kernel session */ - cds_list_for_each_entry(ev, &chan->events_list.head, list) { - DBG("Disabling kernel event %s for channel %s.", - ev->event->name, cmd_ctx->lsm->u.disable.channel_name); - ret = kernel_disable_event(ev); - if (ret < 0) { - continue; - } - } - - /* Quiescent wait after event disable */ - kernel_wait_quiescent(kernel_tracer_fd); - ret = LTTCOMM_OK; + default: + /* TODO Userspace tracer */ break; } - case LTTNG_KERNEL_ENABLE_EVENT: - { - struct ltt_kernel_channel *chan; - struct ltt_kernel_event *ev; - - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, - cmd_ctx->session->kernel_session); - if (chan == NULL) { - ret = LTTCOMM_KERN_CHAN_NOT_FOUND; - goto error; - } - - ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan); - if (ev == NULL) { - DBG("Creating kernel event %s for channel %s.", - cmd_ctx->lsm->u.enable.event.name, chan->channel->name); - ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan); - } else { - DBG("Enabling kernel event %s for channel %s.", - cmd_ctx->lsm->u.enable.event.name, chan->channel->name); - ret = kernel_enable_event(ev); - } - - if (ret < 0) { - ret = LTTCOMM_KERN_ENABLE_FAIL; - goto error; - } - kernel_wait_quiescent(kernel_tracer_fd); - ret = LTTCOMM_OK; + /* Process by command type */ + switch (cmd_ctx->lsm->cmd_type) { + case LTTNG_ADD_CONTEXT: + { + ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.context.channel_name, + cmd_ctx->lsm->u.context.event_name, + &cmd_ctx->lsm->u.context.ctx); break; } - case LTTNG_KERNEL_ENABLE_ALL_EVENT: + case LTTNG_DISABLE_CHANNEL: { - int pos, size; - char *event_list, *event, *ptr; - struct ltt_kernel_channel *chan; - struct ltt_kernel_event *ev; - struct lttng_event ev_attr; - - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - DBG("Enabling all kernel event"); - - chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, - cmd_ctx->session->kernel_session); - if (chan == NULL) { - ret = LTTCOMM_KERN_CHAN_NOT_FOUND; - goto error; - } - - /* For each event in the kernel session */ - cds_list_for_each_entry(ev, &chan->events_list.head, list) { - DBG("Enabling kernel event %s for channel %s.", - ev->event->name, chan->channel->name); - ret = kernel_enable_event(ev); - if (ret < 0) { - continue; - } - } - - size = kernel_list_events(kernel_tracer_fd, &event_list); - if (size < 0) { - ret = LTTCOMM_KERN_LIST_FAIL; - goto error; - } - - ptr = event_list; - while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { - ev = get_kernel_event_by_name(event, chan); - if (ev == NULL) { - strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN); - /* Default event type for enable all */ - ev_attr.type = LTTNG_EVENT_TRACEPOINTS; - /* Enable each single tracepoint event */ - ret = kernel_create_event(&ev_attr, chan); - if (ret < 0) { - /* Ignore error here and continue */ - continue; - } - } - - /* Move pointer to the next line */ - ptr += pos + 1; - free(event); - } - - free(event_list); - - /* Quiescent wait after event enable */ - kernel_wait_quiescent(kernel_tracer_fd); - ret = LTTCOMM_OK; + ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.disable.channel_name); break; } - case LTTNG_KERNEL_LIST_EVENTS: + case LTTNG_DISABLE_EVENT: { - char *event_list; - ssize_t size = 0; - - DBG("Listing kernel events"); - - size = kernel_list_events(kernel_tracer_fd, &event_list); - if (size < 0) { - ret = LTTCOMM_KERN_LIST_FAIL; - goto error; - } - - /* - * Setup lttng message with payload size set to the event list size in - * bytes and then copy list into the llm payload. - */ - ret = setup_lttng_msg(cmd_ctx, size); - if (ret < 0) { - goto setup_error; - } - - /* Copy event list into message payload */ - memcpy(cmd_ctx->llm->payload, event_list, size); - - free(event_list); - + ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.disable.channel_name, + cmd_ctx->lsm->u.disable.name); ret = LTTCOMM_OK; break; } - case LTTNG_START_TRACE: + case LTTNG_DISABLE_ALL_EVENT: { - struct ltt_kernel_channel *chan; - - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - /* Kernel tracing */ - if (cmd_ctx->session->kernel_session != NULL) { - if (cmd_ctx->session->kernel_session->metadata == NULL) { - DBG("Open kernel metadata"); - ret = kernel_open_metadata(cmd_ctx->session->kernel_session); - if (ret < 0) { - ret = LTTCOMM_KERN_META_FAIL; - goto error; - } - } + DBG("Disabling all kernel event"); - if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { - DBG("Opening kernel metadata stream"); - if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { - ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); - if (ret < 0) { - ERR("Kernel create metadata stream failed"); - ret = LTTCOMM_KERN_STREAM_FAIL; - goto error; - } - } - } - - /* For each channel */ - cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { - if (chan->stream_count == 0) { - ret = kernel_open_channel_stream(chan); - if (ret < 0) { - ERR("Kernel create channel stream failed"); - ret = LTTCOMM_KERN_STREAM_FAIL; - goto error; - } - /* Update the stream global counter */ - cmd_ctx->session->kernel_session->stream_count_global += ret; - } - } - - DBG("Start kernel tracing"); - ret = kernel_start_session(cmd_ctx->session->kernel_session); - if (ret < 0) { - ERR("Kernel start session failed"); - ret = LTTCOMM_KERN_START_FAIL; - goto error; - } - - ret = start_kernel_trace(cmd_ctx->session->kernel_session); - if (ret < 0) { - ret = LTTCOMM_KERN_START_FAIL; - goto error; - } - - /* Quiescent wait after starting trace */ - kernel_wait_quiescent(kernel_tracer_fd); - } - - /* TODO: Start all UST traces */ - - ret = LTTCOMM_OK; + ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.disable.channel_name); break; } - case LTTNG_STOP_TRACE: + case LTTNG_ENABLE_CHANNEL: { - struct ltt_kernel_channel *chan; - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - /* Kernel tracer */ - if (cmd_ctx->session->kernel_session != NULL) { - DBG("Stop kernel tracing"); - - ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); - if (ret < 0) { - ERR("Kernel metadata flush failed"); - } - - cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { - ret = kernel_flush_buffer(chan); - if (ret < 0) { - ERR("Kernel flush buffer error"); - } - } - - ret = kernel_stop_session(cmd_ctx->session->kernel_session); - if (ret < 0) { - ERR("Kernel stop session failed"); - ret = LTTCOMM_KERN_STOP_FAIL; - goto error; - } - - /* Quiescent wait after stopping trace */ - kernel_wait_quiescent(kernel_tracer_fd); - } - - /* TODO : User-space tracer */ - - ret = LTTCOMM_OK; + ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, + &cmd_ctx->lsm->u.channel.chan); break; } - case LTTNG_CREATE_SESSION: + case LTTNG_ENABLE_EVENT: { - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path); - if (ret < 0) { - if (ret == -EEXIST) { - ret = LTTCOMM_EXIST_SESS; - } else { - ret = LTTCOMM_FATAL; - } - goto error; - } - - ret = LTTCOMM_OK; + ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.enable.channel_name, + &cmd_ctx->lsm->u.enable.event); break; } - case LTTNG_DESTROY_SESSION: + case LTTNG_ENABLE_ALL_EVENT: { - /* Setup lttng message with no payload */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - /* Clean kernel session teardown */ - teardown_kernel_session(cmd_ctx->session); - - ret = destroy_session(cmd_ctx->lsm->session_name); - if (ret < 0) { - ret = LTTCOMM_FATAL; - goto error; - } + DBG("Enabling all kernel event"); - ret = LTTCOMM_OK; + ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.enable.channel_name, + cmd_ctx->lsm->u.enable.event.type); break; } - /* - case LTTNG_LIST_TRACES: + case LTTNG_LIST_TRACEPOINTS: { - unsigned int trace_count; + struct lttng_event *events; + ssize_t nb_events; - trace_count = get_trace_count_per_session(cmd_ctx->session); - if (trace_count == 0) { - ret = LTTCOMM_NO_TRACE; + nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); + if (nb_events < 0) { + ret = -nb_events; goto error; } - ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count); + /* + * Setup lttng message with payload size set to the event list size in + * bytes and then copy list into the llm payload. + */ + ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); if (ret < 0) { + free(events); goto setup_error; } - get_traces_per_session(cmd_ctx->session, - (struct lttng_trace *)(cmd_ctx->llm->payload)); + /* Copy event list into message payload */ + memcpy(cmd_ctx->llm->payload, events, + sizeof(struct lttng_event) * nb_events); + + free(events); ret = LTTCOMM_OK; break; } - */ - /* - case UST_CREATE_TRACE: + case LTTNG_START_TRACE: { - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - - ret = ust_create_trace(cmd_ctx); - if (ret < 0) { - goto error; - } + ret = cmd_start_trace(cmd_ctx->session); + break; + } + case LTTNG_STOP_TRACE: + { + ret = cmd_stop_trace(cmd_ctx->session); + break; + } + case LTTNG_CREATE_SESSION: + { + ret = cmd_create_session(cmd_ctx->lsm->session.name, + cmd_ctx->lsm->session.path); + break; + } + case LTTNG_DESTROY_SESSION: + { + ret = cmd_destroy_session(cmd_ctx->session, + cmd_ctx->lsm->session.name); break; } - */ - case LTTNG_LIST_TRACEABLE_APPS: + case LTTNG_LIST_DOMAINS: { - unsigned int app_count; + ssize_t nb_dom; + struct lttng_domain *domains; - app_count = get_app_count(); - DBG("Traceable application count : %d", app_count); - if (app_count == 0) { - ret = LTTCOMM_NO_APPS; + nb_dom = cmd_list_domains(cmd_ctx->session, &domains); + if (nb_dom < 0) { + ret = -nb_dom; goto error; } - ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count); + ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); if (ret < 0) { goto setup_error; } - get_app_list_pids((pid_t *)(cmd_ctx->llm->payload)); + /* Copy event list into message payload */ + memcpy(cmd_ctx->llm->payload, domains, + nb_dom * sizeof(struct lttng_domain)); + + free(domains); ret = LTTCOMM_OK; break; } - /* - case UST_START_TRACE: + case LTTNG_LIST_CHANNELS: { - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; + size_t nb_chan; + struct lttng_channel *channels; + + nb_chan = cmd_list_channels(cmd_ctx->session, &channels); + if (nb_chan < 0) { + ret = -nb_chan; + goto error; } - ret = ust_start_trace(cmd_ctx); + ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); if (ret < 0) { goto setup_error; } + + /* Copy event list into message payload */ + memcpy(cmd_ctx->llm->payload, channels, + nb_chan * sizeof(struct lttng_channel)); + + free(channels); + + ret = LTTCOMM_OK; break; } - case UST_STOP_TRACE: + case LTTNG_LIST_EVENTS: { - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; + size_t nb_event; + struct lttng_event *events = NULL; + + nb_event = cmd_list_events(cmd_ctx->session, + cmd_ctx->lsm->u.list.channel_name, &events); + if (nb_event < 0) { + ret = -nb_event; + goto error; } - ret = ust_stop_trace(cmd_ctx); + ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); if (ret < 0) { goto setup_error; } + + /* Copy event list into message payload */ + memcpy(cmd_ctx->llm->payload, events, + nb_event * sizeof(struct lttng_event)); + + free(events); + + ret = LTTCOMM_OK; break; } - */ case LTTNG_LIST_SESSIONS: { - unsigned int session_count; + session_lock_list(); - session_count = get_session_count(); - if (session_count == 0) { + if (session_list_ptr->count == 0) { ret = LTTCOMM_NO_SESSION; + session_unlock_list(); goto error; } - ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count); + ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * + session_list_ptr->count); if (ret < 0) { + session_unlock_list(); goto setup_error; } - get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload)); + /* Filled the session array */ + list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); + + session_unlock_list(); ret = LTTCOMM_OK; break; } + case LTTNG_CALIBRATE: + { + ret = cmd_calibrate(cmd_ctx->lsm->domain.type, + &cmd_ctx->lsm->u.calibrate); + break; + } + case LTTNG_REGISTER_CONSUMER: + { + ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, + cmd_ctx->lsm->u.reg.path); + break; + } default: - /* Undefined command */ - ret = setup_lttng_msg(cmd_ctx, 0); - if (ret < 0) { - goto setup_error; - } - ret = LTTCOMM_UND; break; } - /* Set return code */ - cmd_ctx->llm->ret_code = ret; - - return ret; - error: if (cmd_ctx->llm == NULL) { DBG("Missing llm structure. Allocating one."); @@ -1357,23 +2831,26 @@ error: goto setup_error; } } - /* Notify client of error */ + /* Set return code */ cmd_ctx->llm->ret_code = ret; - setup_error: + if (cmd_ctx->session) { + session_unlock(cmd_ctx->session); + } +init_setup_error: return ret; } /* - * thread_manage_clients - * - * This thread manage all clients request using the unix - * client socket for communication. + * This thread manage all clients request using the unix client socket for + * communication. */ static void *thread_manage_clients(void *data) { - int sock, ret; - struct command_ctx *cmd_ctx; + int sock = 0, ret, i, pollfd; + uint32_t revents, nb_fd; + struct command_ctx *cmd_ctx = NULL; + struct lttng_poll_event events; DBG("[thread] Manage client started"); @@ -1382,16 +2859,61 @@ static void *thread_manage_clients(void *data) goto error; } - /* Notify parent pid that we are ready - * to accept command for client side. + /* + * Pass 2 as size here for the thread quit pipe and client_sock. Nothing + * more will be added to this poll set. + */ + ret = create_thread_poll_set(&events, 2); + if (ret < 0) { + goto error; + } + + /* Add the application registration socket */ + ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); + if (ret < 0) { + goto error; + } + + /* + * Notify parent pid that we are ready to accept command for client side. */ if (opt_sig_parent) { kill(ppid, SIGCHLD); } while (1) { - /* Blocking call, waiting for transmission */ DBG("Accepting client command ..."); + + nb_fd = LTTNG_POLL_GETNB(&events); + + /* Inifinite blocking call, waiting for transmission */ + ret = lttng_poll_wait(&events, -1); + if (ret < 0) { + goto error; + } + + for (i = 0; i < nb_fd; i++) { + /* Fetch once the poll data */ + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Thread quit pipe has been closed. Killing thread. */ + ret = check_thread_quit_pipe(pollfd, revents); + if (ret) { + goto error; + } + + /* Event on the registration socket */ + if (pollfd == client_sock) { + if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { + ERR("Client socket poll error"); + goto error; + } + } + } + + DBG("Wait for client response"); + sock = lttcomm_accept_unix_sock(client_sock); if (sock < 0) { goto error; @@ -1399,9 +2921,18 @@ static void *thread_manage_clients(void *data) /* Allocate context command to process the client request */ cmd_ctx = malloc(sizeof(struct command_ctx)); + if (cmd_ctx == NULL) { + perror("malloc cmd_ctx"); + goto error; + } /* Allocate data buffer for reception */ cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); + if (cmd_ctx->lsm == NULL) { + perror("malloc cmd_ctx->lsm"); + goto error; + } + cmd_ctx->llm = NULL; cmd_ctx->session = NULL; @@ -1411,12 +2942,17 @@ static void *thread_manage_clients(void *data) * the client. */ DBG("Receiving data from client ..."); - ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); + ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, + sizeof(struct lttcomm_session_msg)); if (ret <= 0) { + DBG("Nothing recv() from client... continuing"); + close(sock); + free(cmd_ctx); continue; } - // TODO: Validate cmd_ctx including sanity check for security purpose. + // TODO: Validate cmd_ctx including sanity check for + // security purpose. /* * This function dispatch the work to the kernel or userspace tracer @@ -1426,27 +2962,37 @@ static void *thread_manage_clients(void *data) */ ret = process_client_msg(cmd_ctx); if (ret < 0) { - /* TODO: Inform client somehow of the fatal error. At this point, - * ret < 0 means that a malloc failed (ENOMEM). */ - /* Error detected but still accept command */ - clean_command_ctx(cmd_ctx); + /* + * TODO: Inform client somehow of the fatal error. At + * this point, ret < 0 means that a malloc failed + * (ENOMEM). Error detected but still accept command. + */ + clean_command_ctx(&cmd_ctx); continue; } - DBG("Sending response (size: %d, retcode: %d)", - cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); + DBG("Sending response (size: %d, retcode: %s)", + cmd_ctx->lttng_msg_size, + lttng_get_readable_code(-cmd_ctx->llm->ret_code)); ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); if (ret < 0) { ERR("Failed to send data back to client"); } - clean_command_ctx(cmd_ctx); + clean_command_ctx(&cmd_ctx); /* End of transmission */ close(sock); } error: + DBG("Client thread dying"); + unlink(client_unix_sock_path); + close(client_sock); + close(sock); + + lttng_poll_clean(&events); + clean_command_ctx(&cmd_ctx); return NULL; } @@ -1468,6 +3014,7 @@ static void usage(void) fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); fprintf(stderr, " -q, --quiet No output at all.\n"); fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); + fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); } /* @@ -1489,12 +3036,14 @@ static int parse_args(int argc, char **argv) { "version", 0, 0, 'V' }, { "quiet", 0, 0, 'q' }, { "verbose", 0, 0, 'v' }, + { "verbose-kconsumerd", 0, 0, 'Z' }, { NULL, 0, 0, 0 } }; while (1) { int option_index = 0; - c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); + c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", + long_options, &option_index); if (c == -1) { break; } @@ -1537,7 +3086,11 @@ static int parse_args(int argc, char **argv) opt_quiet = 1; break; case 'v': - opt_verbose = 1; + /* Verbose level can increase using multiple -v */ + opt_verbose += 1; + break; + case 'Z': + opt_verbose_kconsumerd += 1; break; default: /* Unknown option or other error. @@ -1550,13 +3103,11 @@ static int parse_args(int argc, char **argv) } /* - * init_daemon_socket - * - * Creates the two needed socket by the daemon. + * Creates the two needed socket by the daemon. * apps_sock - The communication socket for all UST apps. * client_sock - The communication of the cli tool (lttng). */ -static int init_daemon_socket() +static int init_daemon_socket(void) { int ret = 0; mode_t old_umask; @@ -1588,7 +3139,8 @@ static int init_daemon_socket() } /* File permission MUST be 666 */ - ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); + ret = chmod(apps_unix_sock_path, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); if (ret < 0) { ERR("Set file permissions failed: %s", apps_unix_sock_path); perror("chmod"); @@ -1601,82 +3153,63 @@ end: } /* - * check_existing_daemon - * - * Check if the global socket is available. - * If yes, error is returned. + * Check if the global socket is available, and if a daemon is answering at the + * other side. If yes, error is returned. */ -static int check_existing_daemon() +static int check_existing_daemon(void) { - int ret; - - ret = access(client_unix_sock_path, F_OK); - if (ret == 0) { - ret = access(apps_unix_sock_path, F_OK); + if (access(client_unix_sock_path, F_OK) < 0 && + access(apps_unix_sock_path, F_OK) < 0) { + return 0; } - return ret; -} - -/* - * get_home_dir - * - * Return pointer to home directory path using - * the env variable HOME. - * - * Default : /tmp - */ -static const char *get_home_dir(void) -{ - const char *home_path; - - if ((home_path = (const char *) getenv("HOME")) == NULL) { - home_path = default_home_dir; + /* Is there anybody out there ? */ + if (lttng_session_daemon_alive()) { + return -EEXIST; + } else { + return 0; } - - return home_path; } /* - * set_permissions - * - * Set the tracing group gid onto the client socket. + * Set the tracing group gid onto the client socket. * - * Race window between mkdir and chown is OK because we are going from - * less permissive (root.root) to more permissive (root.tracing). + * Race window between mkdir and chown is OK because we are going from more + * permissive (root.root) to les permissive (root.tracing). */ static int set_permissions(void) { int ret; - struct group *grp; - - /* Decide which group name to use */ - (opt_tracing_group != NULL) ? - (grp = getgrnam(opt_tracing_group)) : - (grp = getgrnam(default_tracing_group)); + gid_t gid; - if (grp == NULL) { - ERR("Missing tracing group. Aborting execution.\n"); - ret = -1; + gid = allowed_group(); + if (gid < 0) { + if (is_root) { + WARN("No tracing group detected"); + ret = 0; + } else { + ERR("Missing tracing group. Aborting execution."); + ret = -1; + } goto end; } /* Set lttng run dir */ - ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); + ret = chown(LTTNG_RUNDIR, 0, gid); if (ret < 0) { ERR("Unable to set group on " LTTNG_RUNDIR); perror("chown"); } /* lttng client socket path */ - ret = chown(client_unix_sock_path, 0, grp->gr_gid); + ret = chown(client_unix_sock_path, 0, gid); if (ret < 0) { ERR("Unable to set group on %s", client_unix_sock_path); perror("chown"); } /* kconsumerd error socket path */ - ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); + ret = chown(kconsumerd_err_unix_sock_path, 0, gid); if (ret < 0) { ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); perror("chown"); @@ -1689,10 +3222,23 @@ end: } /* - * create_lttng_rundir - * - * Create the lttng run directory needed for all - * global sockets and pipe. + * Create the pipe used to wake up the kernel thread. + */ +static int create_kernel_poll_pipe(void) +{ + return pipe2(kernel_poll_pipe, O_CLOEXEC); +} + +/* + * Create the application command pipe to wake thread_manage_apps. + */ +static int create_apps_cmd_pipe(void) +{ + return pipe2(apps_cmd_pipe, O_CLOEXEC); +} + +/* + * Create the lttng run directory needed for all global sockets and pipe. */ static int create_lttng_rundir(void) { @@ -1713,21 +3259,21 @@ error: } /* - * set_kconsumerd_sockets - * - * Setup sockets and directory needed by the kconsumerd - * communication with the session daemon. + * Setup sockets and directory needed by the kconsumerd communication with the + * session daemon. */ static int set_kconsumerd_sockets(void) { int ret; if (strlen(kconsumerd_err_unix_sock_path) == 0) { - snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); + snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, + KCONSUMERD_ERR_SOCK_PATH); } if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { - snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); + snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, + KCONSUMERD_CMD_SOCK_PATH); } ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); @@ -1740,7 +3286,8 @@ static int set_kconsumerd_sockets(void) } /* Create the kconsumerd error unix socket */ - kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); + kconsumerd_err_sock = + lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); if (kconsumerd_err_sock < 0) { ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); ret = -1; @@ -1748,7 +3295,8 @@ static int set_kconsumerd_sockets(void) } /* File permission MUST be 660 */ - ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); + ret = chmod(kconsumerd_err_unix_sock_path, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); if (ret < 0) { ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); perror("chmod"); @@ -1760,35 +3308,32 @@ error: } /* - * sighandler + * Signal handler for the daemon * - * Signal handler for the daemon + * Simply stop all worker threads, leaving main() return gracefully after + * joining all threads and calling cleanup(). */ static void sighandler(int sig) { switch (sig) { - case SIGPIPE: - DBG("SIGPIPE catched"); - return; - case SIGINT: - DBG("SIGINT catched"); - cleanup(); - break; - case SIGTERM: - DBG("SIGTERM catched"); - cleanup(); - break; - default: - break; + case SIGPIPE: + DBG("SIGPIPE catched"); + return; + case SIGINT: + DBG("SIGINT catched"); + stop_threads(); + break; + case SIGTERM: + DBG("SIGTERM catched"); + stop_threads(); + break; + default: + break; } - - exit(EXIT_SUCCESS); } /* - * set_signal_handler - * - * Setup signal handler for : + * Setup signal handler for : * SIGINT, SIGTERM, SIGPIPE */ static int set_signal_handler(void) @@ -1826,16 +3371,15 @@ static int set_signal_handler(void) } /* - * set_ulimit - * - * Set open files limit to unlimited. This daemon can open a large number of - * file descriptors in order to consumer multiple kernel traces. + * Set open files limit to unlimited. This daemon can open a large number of + * file descriptors in order to consumer multiple kernel traces. */ static void set_ulimit(void) { int ret; struct rlimit lim; + /* The kernel does not allowed an infinite limit for open files */ lim.rlim_cur = 65535; lim.rlim_max = 65535; @@ -1852,6 +3396,12 @@ int main(int argc, char **argv) { int ret = 0; void *status; + const char *home_path; + + /* Create thread quit pipe */ + if ((ret = init_thread_quit_pipe()) < 0) { + goto error; + } /* Parse arguments */ progname = argv[0]; @@ -1871,7 +3421,6 @@ int main(int argc, char **argv) /* Check if daemon is UID = 0 */ is_root = !getuid(); - /* Set all sockets path */ if (is_root) { ret = create_lttng_rundir(); if (ret < 0) { @@ -1888,55 +3437,86 @@ int main(int argc, char **argv) DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); } - ret = set_kconsumerd_sockets(); - if (ret < 0) { + /* Set global SHM for ust */ + if (strlen(wait_shm_path) == 0) { + snprintf(wait_shm_path, PATH_MAX, + DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); + } + } else { + home_path = get_home_dir(); + if (home_path == NULL) { + /* TODO: Add --socket PATH option */ + ERR("Can't get HOME directory for sockets creation."); + ret = -EPERM; goto error; } - /* Setup kernel tracer */ - init_kernel_tracer(); - - /* Set ulimit for open files */ - set_ulimit(); - } else { if (strlen(apps_unix_sock_path) == 0) { snprintf(apps_unix_sock_path, PATH_MAX, - DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()); + DEFAULT_HOME_APPS_UNIX_SOCK, home_path); } /* Set the cli tool unix socket path */ if (strlen(client_unix_sock_path) == 0) { snprintf(client_unix_sock_path, PATH_MAX, - DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()); + DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); + } + + /* Set global SHM for ust */ + if (strlen(wait_shm_path) == 0) { + snprintf(wait_shm_path, PATH_MAX, + DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); } } DBG("Client socket path %s", client_unix_sock_path); DBG("Application socket path %s", apps_unix_sock_path); - /* See if daemon already exist. If any of the two - * socket needed by the daemon are present, this test fails + /* + * See if daemon already exist. */ - if ((ret = check_existing_daemon()) == 0) { + if ((ret = check_existing_daemon()) < 0) { ERR("Already running daemon.\n"); - /* We do not goto error because we must not - * cleanup() because a daemon is already running. + /* + * We do not goto exit because we must not cleanup() + * because a daemon is already running. */ - exit(EXIT_FAILURE); + goto error; } - if (set_signal_handler() < 0) { - goto error; + /* After this point, we can safely call cleanup() with "goto exit" */ + + /* + * These actions must be executed as root. We do that *after* setting up + * the sockets path because we MUST make the check for another daemon using + * those paths *before* trying to set the kernel consumer sockets and init + * kernel tracer. + */ + if (is_root) { + ret = set_kconsumerd_sockets(); + if (ret < 0) { + goto exit; + } + + /* Setup kernel tracer */ + init_kernel_tracer(); + + /* Set ulimit for open files */ + set_ulimit(); + } + + if ((ret = set_signal_handler()) < 0) { + goto exit; } /* Setup the needed unix socket */ - if (init_daemon_socket() < 0) { - goto error; + if ((ret = init_daemon_socket()) < 0) { + goto exit; } /* Set credentials to socket */ - if (is_root && (set_permissions() < 0)) { - goto error; + if (is_root && ((ret = set_permissions()) < 0)) { + goto exit; } /* Get parent pid if -S, --sig-parent is specified. */ @@ -1944,32 +3524,116 @@ int main(int argc, char **argv) ppid = getppid(); } - while (1) { - /* Create thread to manage the client socket */ - ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); - if (ret != 0) { - perror("pthread_create"); - goto error; - } + /* Setup the kernel pipe for waking up the kernel thread */ + if ((ret = create_kernel_poll_pipe()) < 0) { + goto exit; + } - /* Create thread to manage application socket */ - ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); - if (ret != 0) { - perror("pthread_create"); - goto error; - } + /* Setup the thread apps communication pipe. */ + if ((ret = create_apps_cmd_pipe()) < 0) { + goto exit; + } - ret = pthread_join(client_thread, &status); - if (ret != 0) { - perror("pthread_join"); - goto error; - } + /* Init UST command queue. */ + cds_wfq_init(&ust_cmd_queue.queue); + + /* + * Get session list pointer. This pointer MUST NOT be free(). This list is + * statically declared in session.c + */ + session_list_ptr = session_get_list(); + + /* Set up max poll set size */ + lttng_poll_set_max_size(); + + /* Create thread to manage the client socket */ + ret = pthread_create(&client_thread, NULL, + thread_manage_clients, (void *) NULL); + if (ret != 0) { + perror("pthread_create clients"); + goto exit_client; } - cleanup(); - exit(EXIT_SUCCESS); + /* Create thread to dispatch registration */ + ret = pthread_create(&dispatch_thread, NULL, + thread_dispatch_ust_registration, (void *) NULL); + if (ret != 0) { + perror("pthread_create dispatch"); + goto exit_dispatch; + } -error: + /* Create thread to manage application registration. */ + ret = pthread_create(®_apps_thread, NULL, + thread_registration_apps, (void *) NULL); + if (ret != 0) { + perror("pthread_create registration"); + goto exit_reg_apps; + } + + /* Create thread to manage application socket */ + ret = pthread_create(&apps_thread, NULL, + thread_manage_apps, (void *) NULL); + if (ret != 0) { + perror("pthread_create apps"); + goto exit_apps; + } + + /* Create kernel thread to manage kernel event */ + ret = pthread_create(&kernel_thread, NULL, + thread_manage_kernel, (void *) NULL); + if (ret != 0) { + perror("pthread_create kernel"); + goto exit_kernel; + } + + ret = pthread_join(kernel_thread, &status); + if (ret != 0) { + perror("pthread_join"); + goto error; /* join error, exit without cleanup */ + } + +exit_kernel: + ret = pthread_join(apps_thread, &status); + if (ret != 0) { + perror("pthread_join"); + goto error; /* join error, exit without cleanup */ + } + +exit_apps: + ret = pthread_join(reg_apps_thread, &status); + if (ret != 0) { + perror("pthread_join"); + goto error; /* join error, exit without cleanup */ + } + +exit_reg_apps: + ret = pthread_join(dispatch_thread, &status); + if (ret != 0) { + perror("pthread_join"); + goto error; /* join error, exit without cleanup */ + } + +exit_dispatch: + ret = pthread_join(client_thread, &status); + if (ret != 0) { + perror("pthread_join"); + goto error; /* join error, exit without cleanup */ + } + + ret = join_kconsumerd_thread(); + if (ret != 0) { + perror("join_kconsumerd"); + goto error; /* join error, exit without cleanup */ + } + +exit_client: +exit: + /* + * cleanup() is called when no other thread is running. + */ cleanup(); + if (!ret) + exit(EXIT_SUCCESS); +error: exit(EXIT_FAILURE); }