/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <getopt.h>
#include <grp.h>
#include <limits.h>
+#include <paths.h>
#include <pthread.h>
-#include <semaphore.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <inttypes.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
-#include <urcu/futex.h>
+#include <urcu/uatomic.h>
#include <unistd.h>
-#include <config.h>
+#include <ctype.h>
#include <common/common.h>
-#include <common/compat/poll.h>
#include <common/compat/socket.h>
+#include <common/compat/getenv.h>
#include <common/defaults.h>
#include <common/kernel-consumer/kernel-consumer.h>
-#include <common/ust-consumer/ust-consumer.h>
+#include <common/futex.h>
+#include <common/relayd/relayd.h>
+#include <common/utils.h>
+#include <common/daemonize.h>
+#include <common/config/session-config.h>
+#include <common/dynamic-buffer.h>
+#include <lttng/event-internal.h>
#include "lttng-sessiond.h"
+#include "buffer-registry.h"
#include "channel.h"
+#include "cmd.h"
+#include "consumer.h"
#include "context.h"
#include "event.h"
-#include "futex.h"
#include "kernel.h"
-#include "modprobe.h"
+#include "kernel-consumer.h"
#include "shm.h"
-#include "ust-ctl.h"
+#include "lttng-ust-ctl.h"
+#include "ust-consumer.h"
#include "utils.h"
-
-#define CONSUMERD_FILE "lttng-consumerd"
-
-struct consumer_data {
- enum lttng_consumer_type type;
-
- pthread_t thread; /* Worker thread interacting with the consumer */
- sem_t sem;
-
- /* Mutex to control consumerd pid assignation */
- pthread_mutex_t pid_mutex;
- pid_t pid;
-
- int err_sock;
- int cmd_sock;
-
- /* consumer error and command Unix socket path */
- char err_unix_sock_path[PATH_MAX];
- char cmd_unix_sock_path[PATH_MAX];
-};
-
-/* Const values */
-const char default_home_dir[] = DEFAULT_HOME_DIR;
-const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
-const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
-const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
+#include "fd-limit.h"
+#include "health-sessiond.h"
+#include "testpoint.h"
+#include "notify-apps.h"
+#include "agent-thread.h"
+#include "save.h"
+#include "notification-thread.h"
+#include "notification-thread-commands.h"
+#include "rotation-thread.h"
+#include "agent.h"
+#include "ht-cleanup.h"
+#include "sessiond-config.h"
+#include "timer.h"
+#include "thread.h"
+#include "client.h"
+#include "dispatch.h"
+#include "register.h"
+#include "manage-apps.h"
+#include "manage-kernel.h"
+
+static const char *help_msg =
+#ifdef LTTNG_EMBED_HELP
+#include <lttng-sessiond.8.h>
+#else
+NULL
+#endif
+;
const char *progname;
-const char *opt_tracing_group;
-static int opt_sig_parent;
-static int opt_verbose_consumer;
-static int opt_daemon;
-static int opt_no_kernel;
-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 char *rundir;
-
-/* Consumer daemon specific control data */
-static struct consumer_data kconsumer_data = {
- .type = LTTNG_CONSUMER_KERNEL,
- .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
- .err_sock = -1,
- .cmd_sock = -1,
-};
-static struct consumer_data ustconsumer64_data = {
- .type = LTTNG_CONSUMER64_UST,
- .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
- .err_sock = -1,
- .cmd_sock = -1,
+static int lockfile_fd = -1;
+static int opt_print_version;
+
+/* Set to 1 when a SIGUSR1 signal is received. */
+static int recv_child_signal;
+
+/* Command line options */
+static const struct option long_options[] = {
+ { "client-sock", required_argument, 0, 'c' },
+ { "apps-sock", required_argument, 0, 'a' },
+ { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
+ { "kconsumerd-err-sock", required_argument, 0, '\0' },
+ { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
+ { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
+ { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
+ { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
+ { "consumerd32-path", required_argument, 0, '\0' },
+ { "consumerd32-libdir", required_argument, 0, '\0' },
+ { "consumerd64-path", required_argument, 0, '\0' },
+ { "consumerd64-libdir", required_argument, 0, '\0' },
+ { "daemonize", no_argument, 0, 'd' },
+ { "background", no_argument, 0, 'b' },
+ { "sig-parent", no_argument, 0, 'S' },
+ { "help", no_argument, 0, 'h' },
+ { "group", required_argument, 0, 'g' },
+ { "version", no_argument, 0, 'V' },
+ { "quiet", no_argument, 0, 'q' },
+ { "verbose", no_argument, 0, 'v' },
+ { "verbose-consumer", no_argument, 0, '\0' },
+ { "no-kernel", no_argument, 0, '\0' },
+ { "pidfile", required_argument, 0, 'p' },
+ { "agent-tcp-port", required_argument, 0, '\0' },
+ { "config", required_argument, 0, 'f' },
+ { "load", required_argument, 0, 'l' },
+ { "kmod-probes", required_argument, 0, '\0' },
+ { "extra-kmod-probes", required_argument, 0, '\0' },
+ { NULL, 0, 0, 0 }
};
-static struct consumer_data ustconsumer32_data = {
- .type = LTTNG_CONSUMER32_UST,
- .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
- .err_sock = -1,
- .cmd_sock = -1,
-};
-
-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];
-/* global wait shm path for UST */
-static char wait_shm_path[PATH_MAX];
-
-/* Sockets and FDs */
-static int client_sock = -1;
-static int apps_sock = -1;
-static int kernel_tracer_fd = -1;
-static int kernel_poll_pipe[2] = { -1, -1 };
-/*
- * 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] = { -1, -1 };
+/* Command line options to ignore from configuration file */
+static const char *config_ignore_options[] = { "help", "version", "config" };
/*
* 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] = { -1, -1 };
-
-/* Pthread, Mutexes and Semaphores */
-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 int apps_cmd_notify_pipe[2] = { -1, -1 };
/*
* 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.
+ * The thread_registration_apps and thread_dispatch_ust_registration uses this
+ * queue along with the wait/wake scheme. The thread_manage_apps receives down
+ * the line new application socket and monitors it for any I/O error or clean
+ * close that triggers an unregistration of the application.
*/
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;
-
-int ust_consumerd64_fd = -1;
-int ust_consumerd32_fd = -1;
-
-static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
-static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
-static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
-static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
-
-static
-void setup_consumerd_path(void)
-{
- const char *bin, *libdir;
-
- /*
- * Allow INSTALL_BIN_PATH to be used as a target path for the
- * native architecture size consumer if CONFIG_CONSUMER*_PATH
- * has not been defined.
- */
-#if (CAA_BITS_PER_LONG == 32)
- if (!consumerd32_bin[0]) {
- consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
- }
- if (!consumerd32_libdir[0]) {
- consumerd32_libdir = INSTALL_LIB_PATH;
- }
-#elif (CAA_BITS_PER_LONG == 64)
- if (!consumerd64_bin[0]) {
- consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
- }
- if (!consumerd64_libdir[0]) {
- consumerd64_libdir = INSTALL_LIB_PATH;
- }
-#else
-#error "Unknown bitness"
-#endif
-
- /*
- * runtime env. var. overrides the build default.
- */
- bin = getenv("LTTNG_CONSUMERD32_BIN");
- if (bin) {
- consumerd32_bin = bin;
- }
- bin = getenv("LTTNG_CONSUMERD64_BIN");
- if (bin) {
- consumerd64_bin = bin;
- }
- libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
- if (libdir) {
- consumerd32_libdir = libdir;
- }
- libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
- if (libdir) {
- consumerd64_libdir = libdir;
- }
-}
-
-/*
- * 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;
-}
-
-/*
- * 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;
- }
-}
-
-/*
- * Init thread quit pipe.
- *
- * Return -1 on error or 0 if all pipes are created.
- */
-static int init_thread_quit_pipe(void)
-{
- int ret, i;
-
- ret = pipe(thread_quit_pipe);
- if (ret < 0) {
- PERROR("thread quit pipe");
- goto error;
- }
-
- for (i = 0; i < 2; i++) {
- ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl");
- 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) {
- DBG3("No kernel session when tearing down session");
- return;
- }
-
- DBG("Tearing down kernel session");
-
- /*
- * If a custom kernel consumer was registered, close the socket before
- * tearing down the complete kernel session structure
- */
- if (kconsumer_data.cmd_sock >= 0 &&
- session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
- lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
- }
-
- trace_kernel_destroy_session(session->kernel_session);
-}
-
-/*
- * Complete teardown of all UST sessions. This will free everything on his path
- * and destroy the core essence of all ust sessions :)
+ * Section name to look for in the daemon configuration file.
*/
-static void teardown_ust_session(struct ltt_session *session)
-{
- int ret;
-
- if (!session->ust_session) {
- DBG3("No UST session when tearing down session");
- return;
- }
-
- DBG("Tearing down UST session(s)");
-
- ret = ust_app_destroy_trace_all(session->ust_session);
- if (ret) {
- ERR("Error in ust_app_destroy_trace_all");
- }
+static const char * const config_section_name = "sessiond";
- trace_ust_destroy_session(session->ust_session);
-}
+/* Am I root or not. Set to 1 if the daemon is running as root */
+static int is_root;
/*
* Stop all threads by closing the thread quit pipe.
/* Stopping all threads */
DBG("Terminating all threads");
- ret = notify_thread_pipe(thread_quit_pipe[1]);
+ ret = sessiond_notify_quit_pipe();
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
+ * Close every consumer sockets.
*/
-static void cleanup(void)
+static void close_consumer_sockets(void)
{
- int ret, i;
- char *cmd;
- struct ltt_session *sess, *stmp;
-
- DBG("Cleaning up");
+ int ret;
- DBG("Removing %s directory", rundir);
- ret = asprintf(&cmd, "rm -rf %s", rundir);
- if (ret < 0) {
- ERR("asprintf failed. Something is really wrong!");
+ if (kconsumer_data.err_sock >= 0) {
+ ret = close(kconsumer_data.err_sock);
+ if (ret < 0) {
+ PERROR("kernel consumer err_sock close");
+ }
}
-
- /* Remove lttng run directory */
- ret = system(cmd);
- if (ret < 0) {
- ERR("Unable to clean %s", rundir);
+ if (ustconsumer32_data.err_sock >= 0) {
+ ret = close(ustconsumer32_data.err_sock);
+ if (ret < 0) {
+ PERROR("UST consumerd32 err_sock close");
+ }
}
- free(cmd);
-
- DBG("Cleaning up all sessions");
-
- /* Destroy session list mutex */
- if (session_list_ptr != NULL) {
- pthread_mutex_destroy(&session_list_ptr->lock);
-
- /* Cleanup ALL session */
- cds_list_for_each_entry_safe(sess, stmp,
- &session_list_ptr->head, list) {
- teardown_kernel_session(sess);
- teardown_ust_session(sess);
- free(sess);
+ if (ustconsumer64_data.err_sock >= 0) {
+ ret = close(ustconsumer64_data.err_sock);
+ if (ret < 0) {
+ PERROR("UST consumerd64 err_sock close");
}
}
-
- DBG("Closing all UST sockets");
- ust_app_clean_list();
-
- pthread_mutex_destroy(&kconsumer_data.pid_mutex);
-
- if (is_root && !opt_no_kernel) {
- DBG2("Closing kernel fd");
- if (kernel_tracer_fd >= 0) {
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
+ if (kconsumer_data.cmd_sock >= 0) {
+ ret = close(kconsumer_data.cmd_sock);
+ if (ret < 0) {
+ PERROR("kernel consumer cmd_sock close");
}
- DBG("Unloading kernel modules");
- modprobe_remove_lttng_all();
}
-
- /*
- * Closing all pipes used for communication between threads.
- */
- for (i = 0; i < 2; i++) {
- if (kernel_poll_pipe[i] >= 0) {
- ret = close(kernel_poll_pipe[i]);
- if (ret) {
- PERROR("close");
- }
-
+ if (ustconsumer32_data.cmd_sock >= 0) {
+ ret = close(ustconsumer32_data.cmd_sock);
+ if (ret < 0) {
+ PERROR("UST consumerd32 cmd_sock close");
}
}
- for (i = 0; i < 2; i++) {
- if (thread_quit_pipe[i] >= 0) {
- ret = close(thread_quit_pipe[i]);
- if (ret) {
- PERROR("close");
- }
+ if (ustconsumer64_data.cmd_sock >= 0) {
+ ret = close(ustconsumer64_data.cmd_sock);
+ if (ret < 0) {
+ PERROR("UST consumerd64 cmd_sock close");
}
}
- for (i = 0; i < 2; i++) {
- if (apps_cmd_pipe[i] >= 0) {
- ret = close(apps_cmd_pipe[i]);
- if (ret) {
- PERROR("close");
- }
+ if (kconsumer_data.channel_monitor_pipe >= 0) {
+ ret = close(kconsumer_data.channel_monitor_pipe);
+ if (ret < 0) {
+ PERROR("kernel consumer channel monitor pipe close");
+ }
+ }
+ if (ustconsumer32_data.channel_monitor_pipe >= 0) {
+ ret = close(ustconsumer32_data.channel_monitor_pipe);
+ if (ret < 0) {
+ PERROR("UST consumerd32 channel monitor pipe close");
+ }
+ }
+ if (ustconsumer64_data.channel_monitor_pipe >= 0) {
+ ret = close(ustconsumer64_data.channel_monitor_pipe);
+ if (ret < 0) {
+ PERROR("UST consumerd64 channel monitor pipe close");
}
}
-
- /* <fun> */
- DBG("%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);
- /* </fun> */
}
/*
- * Send data on a unix socket using the liblttsessiondcomm API.
+ * Wait on consumer process termination.
*
- * Return lttcomm error code.
+ * Need to be called with the consumer data lock held or from a context
+ * ensuring no concurrent access to data (e.g: cleanup).
*/
-static int send_unix_sock(int sock, void *buf, size_t len)
+static void wait_consumer(struct consumer_data *consumer_data)
{
- /* Check valid length */
- if (len <= 0) {
- return -1;
- }
+ pid_t ret;
+ int status;
- return lttcomm_send_unix_sock(sock, buf, len);
-}
+ if (consumer_data->pid <= 0) {
+ return;
+ }
-/*
- * Free memory of a command context structure.
- */
-static void clean_command_ctx(struct command_ctx **cmd_ctx)
-{
- DBG("Clean command context structure");
- if (*cmd_ctx) {
- if ((*cmd_ctx)->llm) {
- free((*cmd_ctx)->llm);
- }
- if ((*cmd_ctx)->lsm) {
- free((*cmd_ctx)->lsm);
- }
- free(*cmd_ctx);
- *cmd_ctx = NULL;
+ DBG("Waiting for complete teardown of consumerd (PID: %d)",
+ consumer_data->pid);
+ ret = waitpid(consumer_data->pid, &status, 0);
+ if (ret == -1) {
+ PERROR("consumerd waitpid pid: %d", consumer_data->pid)
+ } else if (!WIFEXITED(status)) {
+ ERR("consumerd termination with error: %d",
+ WEXITSTATUS(ret));
}
+ consumer_data->pid = 0;
}
/*
- * Send all stream fds of kernel channel to the consumer.
+ * Cleanup the session daemon's data structures.
*/
-static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
- int sock, struct ltt_kernel_channel *channel,
- uid_t uid, gid_t gid)
+static void sessiond_cleanup(void)
{
int ret;
- struct ltt_kernel_stream *stream;
- struct lttcomm_consumer_msg lkm;
-
- DBG("Sending streams of channel %s to kernel consumer",
- channel->channel->name);
-
- /* Send channel */
- lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
- lkm.u.channel.channel_key = channel->fd;
- lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
- lkm.u.channel.mmap_len = 0; /* for kernel */
- DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
- ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
- if (ret < 0) {
- PERROR("send consumer channel");
- goto error;
- }
-
- /* Send streams */
- cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
- if (!stream->fd) {
- continue;
- }
- lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
- lkm.u.stream.channel_key = channel->fd;
- lkm.u.stream.stream_key = stream->fd;
- lkm.u.stream.state = stream->state;
- lkm.u.stream.output = channel->channel->attr.output;
- lkm.u.stream.mmap_len = 0; /* for kernel */
- lkm.u.stream.uid = uid;
- lkm.u.stream.gid = gid;
- strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
- lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
- DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
- ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
- if (ret < 0) {
- PERROR("send consumer stream");
- goto error;
- }
- ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
- if (ret < 0) {
- PERROR("send consumer stream ancillary data");
- goto error;
- }
- }
+ struct ltt_session_list *session_list = session_get_list();
- DBG("consumer channel streams sent");
+ DBG("Cleanup sessiond");
- return 0;
+ /*
+ * Close the thread quit pipe. It has already done its job,
+ * since we are now called.
+ */
+ sessiond_close_quit_pipe();
+ utils_close_pipe(apps_cmd_pipe);
+ utils_close_pipe(apps_cmd_notify_pipe);
+ utils_close_pipe(kernel_poll_pipe);
-error:
- return ret;
-}
+ ret = remove(config.pid_file_path.value);
+ if (ret < 0) {
+ PERROR("remove pidfile %s", config.pid_file_path.value);
+ }
-/*
- * Send all stream fds of the kernel session to the consumer.
- */
-static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
- struct ltt_kernel_session *session)
-{
- int ret;
- struct ltt_kernel_channel *chan;
- struct lttcomm_consumer_msg lkm;
- int sock = session->consumer_fd;
+ DBG("Removing sessiond and consumerd content of directory %s",
+ config.rundir.value);
- DBG("Sending metadata stream fd");
+ /* sessiond */
+ DBG("Removing %s", config.pid_file_path.value);
+ (void) unlink(config.pid_file_path.value);
- /* Extra protection. It's NOT supposed to be set to -1 at this point */
- if (session->consumer_fd < 0) {
- session->consumer_fd = consumer_data->cmd_sock;
- }
+ DBG("Removing %s", config.agent_port_file_path.value);
+ (void) unlink(config.agent_port_file_path.value);
- if (session->metadata_stream_fd >= 0) {
- /* Send metadata channel fd */
- lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
- lkm.u.channel.channel_key = session->metadata->fd;
- lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
- lkm.u.channel.mmap_len = 0; /* for kernel */
- DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key);
- ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
- if (ret < 0) {
- PERROR("send consumer channel");
- goto error;
- }
+ /* kconsumerd */
+ DBG("Removing %s", kconsumer_data.err_unix_sock_path);
+ (void) unlink(kconsumer_data.err_unix_sock_path);
- /* Send metadata stream fd */
- lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
- lkm.u.stream.channel_key = session->metadata->fd;
- lkm.u.stream.stream_key = session->metadata_stream_fd;
- lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
- lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
- lkm.u.stream.mmap_len = 0; /* for kernel */
- lkm.u.stream.uid = session->uid;
- lkm.u.stream.gid = session->gid;
- strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
- lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
- DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
- ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
- if (ret < 0) {
- PERROR("send consumer stream");
- goto error;
- }
- ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
- if (ret < 0) {
- PERROR("send consumer stream");
- goto error;
- }
- }
+ DBG("Removing directory %s", config.kconsumerd_path.value);
+ (void) rmdir(config.kconsumerd_path.value);
- cds_list_for_each_entry(chan, &session->channel_list.head, list) {
- ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
- session->uid, session->gid);
- if (ret < 0) {
- goto error;
- }
- }
+ /* ust consumerd 32 */
+ DBG("Removing %s", config.consumerd32_err_unix_sock_path.value);
+ (void) unlink(config.consumerd32_err_unix_sock_path.value);
- DBG("consumer fds (metadata and channel streams) sent");
+ DBG("Removing directory %s", config.consumerd32_path.value);
+ (void) rmdir(config.consumerd32_path.value);
- return 0;
+ /* ust consumerd 64 */
+ DBG("Removing %s", config.consumerd64_err_unix_sock_path.value);
+ (void) unlink(config.consumerd64_err_unix_sock_path.value);
-error:
- return ret;
-}
+ DBG("Removing directory %s", config.consumerd64_path.value);
+ (void) rmdir(config.consumerd64_path.value);
-/*
- * Notify UST applications using the shm mmap futex.
- */
-static int notify_ust_apps(int active)
-{
- char *wait_shm_mmap;
+ pthread_mutex_destroy(&session_list->lock);
- DBG("Notifying applications of session daemon state: %d", active);
+ DBG("Cleaning up all agent apps");
+ agent_app_ht_clean();
+ DBG("Closing all UST sockets");
+ ust_app_clean_list();
+ buffer_reg_destroy_registries();
- /* 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;
- }
+ close_consumer_sockets();
- /* Wake waiting process */
- futex_wait_update((int32_t *) wait_shm_mmap, active);
+ wait_consumer(&kconsumer_data);
+ wait_consumer(&ustconsumer64_data);
+ wait_consumer(&ustconsumer32_data);
- /* Apps notified successfully */
- return 0;
+ if (is_root && !config.no_kernel) {
+ cleanup_kernel_tracer();
+ }
-error:
- return -1;
+ /*
+ * We do NOT rmdir rundir because there are other processes
+ * using it, for instance lttng-relayd, which can start in
+ * parallel with this teardown.
+ */
}
/*
- * 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.
+ * Cleanup the daemon's option data structures.
*/
-static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
+static void sessiond_cleanup_options(void)
{
- int ret, buf_size;
-
- buf_size = size;
-
- cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
- if (cmd_ctx->llm == NULL) {
- PERROR("zmalloc");
- ret = -ENOMEM;
- goto error;
- }
-
- /* Copy common data */
- cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
- cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
+ DBG("Cleaning up options");
- cmd_ctx->llm->data_size = size;
- cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
+ sessiond_config_fini(&config);
- return buf_size;
+ run_as_destroy_worker();
+}
-error:
- return ret;
+static int string_match(const char *str1, const char *str2)
+{
+ return (str1 && str2) && !strcmp(str1, str2);
}
/*
- * Update the kernel poll set of all channel fd available over all tracing
- * session. Add the wakeup pipe at the end of the set.
+ * Take an option from the getopt output and set it in the right variable to be
+ * used later.
+ *
+ * Return 0 on success else a negative value.
*/
-static int update_kernel_poll(struct lttng_poll_event *events)
+static int set_option(int opt, const char *arg, const char *optname)
{
- int ret;
- struct ltt_session *session;
- struct ltt_kernel_channel *channel;
-
- DBG("Updating kernel poll set");
+ int ret = 0;
- 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;
+ if (string_match(optname, "client-sock") || opt == 'c') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- 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;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-c, --client-sock");
+ } else {
+ config_string_set(&config.client_unix_sock_path,
+ strdup(arg));
+ if (!config.client_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
}
- DBG("Channel fd %d added to kernel set", channel->fd);
}
- session_unlock(session);
- }
- session_unlock_list();
-
- return 0;
-
-error:
- session_unlock_list();
- return -1;
-}
-
-/*
- * 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.
- *
- * Useful for CPU hotplug feature.
- */
-static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
-{
- int ret = 0;
- struct ltt_session *session;
- struct ltt_kernel_channel *channel;
-
- DBG("Updating kernel streams for channel fd %d", fd);
-
- 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;
- }
-
- /* This is not suppose to be -1 but this is an extra security check */
- if (session->kernel_session->consumer_fd < 0) {
- session->kernel_session->consumer_fd = consumer_data->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->consumer_fds_sent == 1) {
- ret = send_kconsumer_channel_streams(consumer_data,
- session->kernel_session->consumer_fd, channel,
- session->uid, session->gid);
- if (ret < 0) {
- goto error;
- }
- }
- goto error;
- }
- }
- session_unlock(session);
- }
- session_unlock_list();
- return ret;
-
-error:
- session_unlock(session);
- session_unlock_list();
- return ret;
-}
-
-/*
- * For each tracing session, update newly registered apps.
- */
-static void update_ust_app(int app_sock)
-{
- struct ltt_session *sess, *stmp;
-
- session_lock_list();
-
- /* For all tracing session(s) */
- cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
- session_lock(sess);
- if (sess->ust_session) {
- ust_app_global_update(sess->ust_session, app_sock);
- }
- session_unlock(sess);
- }
-
- session_unlock_list();
-}
-
-/*
- * 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_poll_create;
- }
-
- 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 */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- 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(&kconsumer_data, pollfd);
- if (ret < 0) {
- continue;
- }
- break;
- /*
- * TODO: We might want to handle the LPOLLERR | LPOLLHUP
- * and unregister kernel stream at this point.
- */
- }
- }
- }
- }
-
-error:
- lttng_poll_clean(&events);
-error_poll_create:
- DBG("Kernel thread dying");
- return NULL;
-}
-
-/*
- * This thread manage the consumer error sent back to the session daemon.
- */
-static void *thread_manage_consumer(void *data)
-{
- int sock = -1, i, ret, pollfd;
- uint32_t revents, nb_fd;
- enum lttcomm_return_code code;
- struct lttng_poll_event events;
- struct consumer_data *consumer_data = data;
-
- DBG("[thread] Manage consumer started");
-
- ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
- if (ret < 0) {
- goto error_listen;
- }
-
- /*
- * 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_poll;
- }
-
- ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
-restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- 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 == consumer_data->err_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("consumer err socket poll error");
- goto error;
- }
- }
- }
-
- sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
- if (sock < 0) {
- goto error;
- }
-
- DBG2("Receiving code from consumer err_sock");
-
- /* Getting status code from kconsumerd */
- ret = lttcomm_recv_unix_sock(sock, &code,
- sizeof(enum lttcomm_return_code));
- if (ret <= 0) {
- goto error;
- }
-
- if (code == CONSUMERD_COMMAND_SOCK_READY) {
- consumer_data->cmd_sock =
- lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
- if (consumer_data->cmd_sock < 0) {
- sem_post(&consumer_data->sem);
- PERROR("consumer connect");
- goto error;
- }
- /* Signal condition to tell that the kconsumerd is ready */
- sem_post(&consumer_data->sem);
- DBG("consumer command socket ready");
- } else {
- ERR("consumer 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, consumer_data->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 */
-restart_poll:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart_poll;
- }
- 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("consumer 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("consumer closed the command socket");
- goto error;
- }
-
- ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
-
-error:
- if (consumer_data->err_sock >= 0) {
- ret = close(consumer_data->err_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (consumer_data->cmd_sock >= 0) {
- ret = close(consumer_data->cmd_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- }
-
- unlink(consumer_data->err_unix_sock_path);
- unlink(consumer_data->cmd_unix_sock_path);
- consumer_data->pid = 0;
-
- lttng_poll_clean(&events);
-error_poll:
-error_listen:
- DBG("consumer thread cleanup completed");
-
- 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");
-
- rcu_register_thread();
- rcu_thread_online();
-
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- 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 */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- 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 == -ENOMEM) {
- goto error;
- } else if (ret < 0) {
- break;
- }
-
- /*
- * Validate UST version compatibility.
- */
- ret = ust_app_validate_version(ust_cmd.sock);
- if (ret >= 0) {
- /*
- * Add channel(s) and event(s) to newly registered apps
- * from lttng global UST domain.
- */
- update_ust_app(ust_cmd.sock);
- }
-
- ret = ust_app_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.
- * Listen on POLLIN (even if we never expect any
- * data) to ensure that hangup wakes us.
- */
- ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
- 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 on remote end. */
- ust_app_unregister(pollfd);
- break;
- }
- }
- }
- }
-
-error:
- lttng_poll_clean(&events);
-error_poll_create:
- DBG("Application communication apps thread cleanup complete");
- rcu_thread_offline();
- rcu_unregister_thread();
- 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("Woken 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 = -1, 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_listen;
- }
-
- /*
- * 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_create_poll;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- /* 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 */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- 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 = zmalloc(sizeof(struct ust_command));
- if (ust_cmd == NULL) {
- PERROR("ust command zmalloc");
- 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);
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- sock = -1;
- continue;
- }
-
- ust_cmd->sock = sock;
- sock = -1;
-
- 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:
- /* Notify that the registration thread is gone */
- notify_ust_apps(0);
-
- if (apps_sock >= 0) {
- ret = close(apps_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- }
- unlink(apps_unix_sock_path);
-
-error_poll_add:
- lttng_poll_clean(&events);
-error_listen:
-error_create_poll:
- DBG("UST Registration thread cleanup complete");
-
- return NULL;
-}
-
-/*
- * Start the thread_manage_consumer. This must be done after a lttng-consumerd
- * exec or it will fails.
- */
-static int spawn_consumer_thread(struct consumer_data *consumer_data)
-{
- int ret;
- struct timespec timeout;
-
- timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
- timeout.tv_nsec = 0;
-
- /* Setup semaphore */
- ret = sem_init(&consumer_data->sem, 0, 0);
- if (ret < 0) {
- PERROR("sem_init consumer semaphore");
- goto error;
- }
-
- ret = pthread_create(&consumer_data->thread, NULL,
- thread_manage_consumer, consumer_data);
- if (ret != 0) {
- PERROR("pthread_create consumer");
- ret = -1;
- goto error;
- }
-
- /* Get time for sem_timedwait absolute timeout */
- ret = clock_gettime(CLOCK_REALTIME, &timeout);
- if (ret < 0) {
- PERROR("clock_gettime spawn consumer");
- /* Infinite wait for the kconsumerd thread to be ready */
- ret = sem_wait(&consumer_data->sem);
- } else {
- /* Normal timeout if the gettime was successful */
- timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
- ret = sem_timedwait(&consumer_data->sem, &timeout);
- }
-
- if (ret < 0) {
- if (errno == ETIMEDOUT) {
- /*
- * Call has timed out so we kill the kconsumerd_thread and return
- * an error.
- */
- ERR("The consumer thread was never ready. Killing it");
- ret = pthread_cancel(consumer_data->thread);
- if (ret < 0) {
- PERROR("pthread_cancel consumer thread");
- }
- } else {
- PERROR("semaphore wait failed consumer thread");
- }
- goto error;
- }
-
- pthread_mutex_lock(&consumer_data->pid_mutex);
- if (consumer_data->pid == 0) {
- ERR("Kconsumerd did not start");
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto error;
- }
- pthread_mutex_unlock(&consumer_data->pid_mutex);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Join consumer thread
- */
-static int join_consumer_thread(struct consumer_data *consumer_data)
-{
- void *status;
- int ret;
-
- if (consumer_data->pid != 0) {
- ret = kill(consumer_data->pid, SIGTERM);
- if (ret) {
- ERR("Error killing consumer daemon");
- return ret;
- }
- return pthread_join(consumer_data->thread, &status);
- } else {
- return 0;
- }
-}
-
-/*
- * Fork and exec a consumer daemon (consumerd).
- *
- * Return pid if successful else -1.
- */
-static pid_t spawn_consumerd(struct consumer_data *consumer_data)
-{
- int ret;
- pid_t pid;
- const char *consumer_to_use;
- const char *verbosity;
- struct stat st;
-
- DBG("Spawning consumerd");
-
- pid = fork();
- if (pid == 0) {
- /*
- * Exec consumerd.
- */
- if (opt_verbose_consumer) {
- verbosity = "--verbose";
- } else {
- verbosity = "--quiet";
- }
- switch (consumer_data->type) {
- case LTTNG_CONSUMER_KERNEL:
- /*
- * Find out which consumerd to execute. We will first try the
- * 64-bit path, then the sessiond's installation directory, and
- * fallback on the 32-bit one,
- */
- DBG3("Looking for a kernel consumer at these locations:");
- DBG3(" 1) %s", consumerd64_bin);
- DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
- DBG3(" 3) %s", consumerd32_bin);
- if (stat(consumerd64_bin, &st) == 0) {
- DBG3("Found location #1");
- consumer_to_use = consumerd64_bin;
- } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
- DBG3("Found location #2");
- consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
- } else if (stat(consumerd32_bin, &st) == 0) {
- DBG3("Found location #3");
- consumer_to_use = consumerd32_bin;
- } else {
- DBG("Could not find any valid consumerd executable");
- break;
- }
- DBG("Using kernel consumer at: %s", consumer_to_use);
- execl(consumer_to_use,
- "lttng-consumerd", verbosity, "-k",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- break;
- case LTTNG_CONSUMER64_UST:
- {
- char *tmpnew = NULL;
-
- if (consumerd64_libdir[0] != '\0') {
- char *tmp;
- size_t tmplen;
-
- tmp = getenv("LD_LIBRARY_PATH");
- if (!tmp) {
- tmp = "";
- }
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
- tmpnew = zmalloc(tmplen + 1 /* \0 */);
- if (!tmpnew) {
- ret = -ENOMEM;
- goto error;
- }
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd64_libdir);
- if (tmp[0] != '\0') {
- strcat(tmpnew, ":");
- strcat(tmpnew, tmp);
- }
- ret = putenv(tmpnew);
- if (ret) {
- ret = -errno;
- goto error;
- }
- }
- DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
- ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- if (consumerd64_libdir[0] != '\0') {
- free(tmpnew);
- }
- if (ret) {
- goto error;
- }
- break;
- }
- case LTTNG_CONSUMER32_UST:
- {
- char *tmpnew = NULL;
-
- if (consumerd32_libdir[0] != '\0') {
- char *tmp;
- size_t tmplen;
-
- tmp = getenv("LD_LIBRARY_PATH");
- if (!tmp) {
- tmp = "";
- }
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
- tmpnew = zmalloc(tmplen + 1 /* \0 */);
- if (!tmpnew) {
- ret = -ENOMEM;
- goto error;
- }
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd32_libdir);
- if (tmp[0] != '\0') {
- strcat(tmpnew, ":");
- strcat(tmpnew, tmp);
- }
- ret = putenv(tmpnew);
- if (ret) {
- ret = -errno;
- goto error;
- }
- }
- DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
- ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- if (consumerd32_libdir[0] != '\0') {
- free(tmpnew);
- }
- if (ret) {
- goto error;
- }
- break;
- }
- default:
- PERROR("unknown consumer type");
- exit(EXIT_FAILURE);
- }
- if (errno != 0) {
- PERROR("kernel start consumer exec");
- }
- exit(EXIT_FAILURE);
- } else if (pid > 0) {
- ret = pid;
- } else {
- PERROR("start consumer fork");
- ret = -errno;
- }
-error:
- return ret;
-}
-
-/*
- * Spawn the consumerd daemon and session daemon thread.
- */
-static int start_consumerd(struct consumer_data *consumer_data)
-{
- int ret;
-
- pthread_mutex_lock(&consumer_data->pid_mutex);
- if (consumer_data->pid != 0) {
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto end;
- }
-
- ret = spawn_consumerd(consumer_data);
- if (ret < 0) {
- ERR("Spawning consumerd failed");
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto error;
- }
-
- /* Setting up the consumer_data pid */
- consumer_data->pid = ret;
- DBG2("Consumer pid %d", consumer_data->pid);
- pthread_mutex_unlock(&consumer_data->pid_mutex);
-
- DBG2("Spawning consumer control thread");
- ret = spawn_consumer_thread(consumer_data);
- if (ret < 0) {
- ERR("Fatal error spawning consumer control thread");
- goto error;
- }
-
-end:
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Check version of the lttng-modules.
- */
-static int validate_lttng_modules_version(void)
-{
- return kernel_validate_version(kernel_tracer_fd);
-}
-
-/*
- * Setup necessary data for kernel tracer action.
- */
-static int init_kernel_tracer(void)
-{
- int ret;
-
- /* Modprobe lttng kernel modules */
- ret = modprobe_lttng_control();
- if (ret < 0) {
- goto error;
- }
-
- /* Open debugfs lttng */
- kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
- if (kernel_tracer_fd < 0) {
- DBG("Failed to open %s", module_proc_lttng);
- ret = -1;
- goto error_open;
- }
-
- /* Validate kernel version */
- ret = validate_lttng_modules_version();
- if (ret < 0) {
- goto error_version;
- }
-
- ret = modprobe_lttng_data();
- if (ret < 0) {
- goto error_modules;
- }
-
- DBG("Kernel tracer fd %d", kernel_tracer_fd);
- return 0;
-
-error_version:
- modprobe_remove_lttng_control();
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
- kernel_tracer_fd = -1;
- return LTTCOMM_KERN_VERSION;
-
-error_modules:
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
-
-error_open:
- modprobe_remove_lttng_control();
-
-error:
- WARN("No kernel tracer available");
- kernel_tracer_fd = -1;
- if (!is_root) {
- return LTTCOMM_NEED_ROOT_SESSIOND;
- } else {
- return LTTCOMM_KERN_NA;
- }
-}
-
-/*
- * 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->consumer_fds_sent == 0) {
- /*
- * Assign default kernel consumer socket if no consumer assigned to the
- * kernel session. At this point, it's NOT supposed to be -1 but this is
- * an extra security check.
- */
- if (session->consumer_fd < 0) {
- session->consumer_fd = kconsumer_data.cmd_sock;
- }
-
- ret = send_kconsumer_session_streams(&kconsumer_data, session);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
-
- session->consumer_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)
-{
- struct ltt_ust_session *lus = NULL;
- int ret;
-
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- break;
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- DBG("Creating UST session");
-
- lus = trace_ust_create_session(session->path, session->id, domain);
- if (lus == NULL) {
- ret = LTTCOMM_UST_SESS_FAIL;
- goto error;
- }
-
- ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
- session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTCOMM_UST_SESS_FAIL;
- goto error;
- }
- }
-
- /* The domain type dictate different actions on session creation */
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- /* No ustctl for the global UST domain */
- break;
- default:
- ERR("Unknown UST domain on create session %d", domain->type);
- goto error;
- }
- lus->uid = session->uid;
- lus->gid = session->gid;
- session->ust_session = lus;
-
- 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 (kconsumer_data.cmd_sock >= 0) {
- session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
- }
-
- ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- goto error;
- }
- }
- session->kernel_session->uid = session->uid;
- session->kernel_session->gid = session->gid;
-
-error:
- return ret;
-}
-
-/*
- * Check if the UID or GID match the session. Root user has access to all
- * sessions.
- */
-static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
-{
- if (uid != session->uid && gid != session->gid && uid != 0) {
- return 0;
- } else {
- return 1;
- }
-}
-
-static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
-{
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Counting number of available session for UID %d GID %d",
- uid, gid);
- cds_list_for_each_entry(session, &session_list_ptr->head, list) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
- i++;
- }
- return i;
-}
-
-/*
- * 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, uid_t uid,
- gid_t gid)
-{
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Getting all available session for UID %d GID %d",
- uid, gid);
- /*
- * 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) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
- 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';
- sessions[i].enabled = session->enabled;
- i++;
- }
-}
-
-/*
- * Fill lttng_channel array of all channels.
- */
-static void list_lttng_channels(int domain, struct ltt_session *session,
- struct lttng_channel *channels)
-{
- int i = 0;
- struct ltt_kernel_channel *kchan;
-
- DBG("Listing channels for session %s", session->name);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* 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++;
- }
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ht_iter iter;
- struct ltt_ust_channel *uchan;
-
- cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
- &iter.iter, uchan, node.node) {
- strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
- channels[i].attr.overwrite = uchan->attr.overwrite;
- channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
- channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
- channels[i].attr.switch_timer_interval =
- uchan->attr.switch_timer_interval;
- channels[i].attr.read_timer_interval =
- uchan->attr.read_timer_interval;
- channels[i].enabled = uchan->enabled;
- switch (uchan->attr.output) {
- case LTTNG_UST_MMAP:
- default:
- channels[i].attr.output = LTTNG_EVENT_MMAP;
- break;
- }
- i++;
- }
- break;
- }
- default:
- break;
- }
-}
-
-/*
- * Create a list of ust global domain events.
- */
-static int list_lttng_ust_global_events(char *channel_name,
- struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
-{
- int i = 0, ret = 0;
- unsigned int nb_event = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_str *node;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_event *uevent;
- struct lttng_event *tmp;
-
- DBG("Listing UST global events for channel %s", channel_name);
-
- rcu_read_lock();
-
- lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
-
- nb_event += lttng_ht_get_count(uchan->events);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- DBG3("Listing UST global %d events", nb_event);
-
- tmp = zmalloc(nb_event * sizeof(struct lttng_event));
- if (tmp == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
- tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- tmp[i].enabled = uevent->enabled;
- switch (uevent->attr.instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- tmp[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_UST_PROBE:
- tmp[i].type = LTTNG_EVENT_PROBE;
- break;
- case LTTNG_UST_FUNCTION:
- tmp[i].type = LTTNG_EVENT_FUNCTION;
- break;
- }
- tmp[i].loglevel = uevent->attr.loglevel;
- switch (uevent->attr.loglevel_type) {
- case LTTNG_UST_LOGLEVEL_ALL:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
- break;
- case LTTNG_UST_LOGLEVEL_RANGE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
- break;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
- break;
- }
- i++;
- }
-
- ret = nb_event;
- *events = tmp;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Fill lttng_event array of all kernel events in the channel.
- */
-static int list_lttng_kernel_events(char *channel_name,
- struct ltt_kernel_session *kernel_session, struct lttng_event **events)
-{
- int i = 0, ret;
- unsigned int nb_event;
- struct ltt_kernel_event *event;
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- nb_event = kchan->event_count;
-
- DBG("Listing events for channel %s", kchan->channel->name);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- *events = zmalloc(nb_event * sizeof(struct lttng_event));
- if (*events == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- /* 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++;
- }
-
- return nb_event;
-
-error:
- return ret;
-}
-
-/*
- * 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;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- 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:
- {
- struct ltt_ust_channel *uchan;
- struct lttng_ht *chan_ht;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = channel_ust_disable(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
- */
-static int cmd_enable_channel(struct ltt_session *session,
- int domain, struct lttng_channel *attr)
-{
- int ret;
- struct ltt_ust_session *usess = session->ust_session;
- struct lttng_ht *chan_ht;
-
- DBG("Enabling channel %s for session %s", attr->name, session->name);
-
- switch (domain) {
- 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:
- {
- struct ltt_ust_channel *uchan;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
- if (uchan == NULL) {
- ret = channel_ust_create(usess, domain, attr);
- } else {
- ret = channel_ust_enable(usess, domain, uchan);
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
-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;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- DBG3("Disable UST event %s in channel %s completed", event_name,
- channel_name);
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- 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;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
- struct ltt_kernel_channel *kchan;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_all(ksess, kchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
- struct ltt_ust_channel *uchan;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
- if (ret != 0) {
- goto error;
- }
-
- DBG3("Disable all UST events in channel %s completed", channel_name);
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-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;
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess = session->ust_session;
-
- ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- 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 lttng_channel *attr;
- struct ltt_ust_session *usess = session->ust_session;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
-
- /* This call will notify the kernel thread */
- ret = channel_kernel_create(session->kernel_session,
- attr, kernel_poll_pipe[1]);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
- }
-
- /* 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;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
- ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
- */
-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;
- }
-
- /* 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;
- }
-
- }
-
- switch (event_type) {
- case LTTNG_EVENT_SYSCALL:
- ret = event_kernel_enable_all_syscalls(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- case LTTNG_EVENT_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_EVENT_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;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess = session->ust_session;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- /* Use the internal command enable channel */
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
-
- switch (event_type) {
- case LTTNG_EVENT_ALL:
- case LTTNG_EVENT_TRACEPOINT:
- ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-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;
- case LTTNG_DOMAIN_UST:
- nb_events = ust_app_list_events(events);
- if (nb_events < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- return nb_events;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_START_TRACE processed by the client thread.
- */
-static int cmd_start_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- /* Short cut */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (session->enabled) {
- /* Already started. */
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- session->enabled = 1;
-
- /* Kernel tracing */
- if (ksession != NULL) {
- struct ltt_kernel_channel *kchan;
-
- /* 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;
- }
+ } else if (string_match(optname, "apps-sock") || opt == 'a') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- /* 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;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-a, --apps-sock");
+ } else {
+ config_string_set(&config.apps_unix_sock_path,
+ strdup(arg));
+ if (!config.apps_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
}
}
-
- /* 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;
+ } else if (string_match(optname, "daemonize") || opt == 'd') {
+ config.daemonize = true;
+ } else if (string_match(optname, "background") || opt == 'b') {
+ config.background = true;
+ } else if (string_match(optname, "group") || opt == 'g') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-g, --group");
+ } else {
+ config_string_set(&config.tracing_group_name,
+ strdup(arg));
+ if (!config.tracing_group_name.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
}
}
-
- /* 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);
- }
-
- /* Flag session that trace should start automatically */
- if (usess) {
- usess->start_trace = 1;
-
- ret = ust_app_start_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_START_FAIL;
- goto error;
+ } else if (string_match(optname, "help") || opt == 'h') {
+ ret = utils_show_help(8, "lttng-sessiond", help_msg);
+ if (ret) {
+ ERR("Cannot show --help for `lttng-sessiond`");
+ perror("exec");
+ }
+ exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
+ } else if (string_match(optname, "version") || opt == 'V') {
+ opt_print_version = 1;
+ } else if (string_match(optname, "sig-parent") || opt == 'S') {
+ config.sig_parent = true;
+ } else if (string_match(optname, "kconsumerd-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--kconsumerd-err-sock");
+ } else {
+ config_string_set(&config.kconsumerd_err_unix_sock_path,
+ strdup(arg));
+ if (!config.kconsumerd_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_STOP_TRACE processed by the client thread.
- */
-static int cmd_stop_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- /* Short cut */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (!session->enabled) {
- ret = LTTCOMM_TRACE_ALREADY_STOPPED;
- goto error;
- }
-
- session->enabled = 0;
-
- /* 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");
+ } else if (string_match(optname, "kconsumerd-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- ret = kernel_flush_buffer(kchan);
- if (ret < 0) {
- ERR("Kernel flush buffer error");
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--kconsumerd-cmd-sock");
+ } else {
+ config_string_set(&config.kconsumerd_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.kconsumerd_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
}
}
-
- ret = kernel_stop_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- if (usess) {
- usess->start_trace = 0;
-
- ret = ust_app_stop_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_STOP_FAIL;
- goto error;
+ } else if (string_match(optname, "ustconsumerd64-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_CREATE_SESSION processed by the client thread.
- */
-static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
-{
- int ret;
-
- ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
- LTTNG_SOCK_GET_GID_CRED(creds));
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DESTROY_SESSION processed by the client thread.
- */
-static int cmd_destroy_session(struct ltt_session *session, char *name)
-{
- int ret;
-
- /* Clean kernel session teardown */
- teardown_kernel_session(session);
- /* UST session teardown */
- teardown_ust_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");
- }
-
- ret = session_destroy(session);
-
- return ret;
-}
-
-/*
- * Command LTTNG_CALIBRATE processed by the client thread.
- */
-static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
-{
- int ret;
-
- 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;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--ustconsumerd64-err-sock");
+ } else {
+ config_string_set(&config.consumerd64_err_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd64_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ust_calibrate ucalibrate;
-
- ucalibrate.type = calibrate->type;
- ret = ust_app_calibrate_glb(&ucalibrate);
- if (ret < 0) {
- ret = LTTCOMM_UST_CALIBRATE_FAIL;
- goto error;
+ } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- break;
- }
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- 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_fds_sent != 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--ustconsumerd64-cmd-sock");
+ } else {
+ config_string_set(&config.consumerd64_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd64_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
-
- sock = lttcomm_connect_unix_sock(sock_path);
- if (sock < 0) {
- ret = LTTCOMM_CONNECT_FAIL;
- goto error;
+ } else if (string_match(optname, "ustconsumerd32-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- session->kernel_session->consumer_fd = sock;
- break;
- default:
- /* TODO: Userspace tracing */
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * 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, index = 0;
- ssize_t nb_dom = 0;
-
- if (session->kernel_session != NULL) {
- DBG3("Listing domains found kernel domain");
- nb_dom++;
- }
-
- if (session->ust_session != NULL) {
- DBG3("Listing domains found UST global domain");
- nb_dom++;
- }
-
- *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
- if (*domains == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- if (session->kernel_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
- index++;
- }
-
- if (session->ust_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_UST;
- index++;
- }
-
- return nb_dom;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_CHANNELS processed by the client thread.
- */
-static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
- struct lttng_channel **channels)
-{
- int ret;
- ssize_t nb_chan = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_chan = session->kernel_session->channel_count;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--ustconsumerd32-err-sock");
+ } else {
+ config_string_set(&config.consumerd32_err_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd32_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
- DBG3("Number of kernel channels %zd", nb_chan);
- break;
- case LTTNG_DOMAIN_UST:
- if (session->ust_session != NULL) {
- nb_chan = lttng_ht_get_count(
- session->ust_session->domain_global.channels);
+ } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- DBG3("Number of UST global channels %zd", nb_chan);
- break;
- default:
- *channels = NULL;
- ret = -LTTCOMM_UND;
- goto error;
- }
-
- if (nb_chan > 0) {
- *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
- if (*channels == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--ustconsumerd32-cmd-sock");
+ } else {
+ config_string_set(&config.consumerd32_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd32_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
-
- list_lttng_channels(domain, session, *channels);
- } else {
- *channels = NULL;
- }
-
- return nb_chan;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_EVENTS processed by the client thread.
- */
-static ssize_t cmd_list_events(int domain, struct ltt_session *session,
- char *channel_name, struct lttng_event **events)
-{
- int ret = 0;
- ssize_t nb_event = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_event = list_lttng_kernel_events(channel_name,
- session->kernel_session, events);
+ } else if (string_match(optname, "no-kernel")) {
+ config.no_kernel = true;
+ } else if (string_match(optname, "quiet") || opt == 'q') {
+ config.quiet = true;
+ } else if (string_match(optname, "verbose") || opt == 'v') {
+ /* Verbose level can increase using multiple -v */
+ if (arg) {
+ /* Value obtained from config file */
+ config.verbose = config_parse_value(arg);
+ } else {
+ /* -v used on command line */
+ config.verbose++;
+ }
+ /* Clamp value to [0, 3] */
+ config.verbose = config.verbose < 0 ? 0 :
+ (config.verbose <= 3 ? config.verbose : 3);
+ } else if (string_match(optname, "verbose-consumer")) {
+ if (arg) {
+ config.verbose_consumer = config_parse_value(arg);
+ } else {
+ config.verbose_consumer++;
}
- break;
- case LTTNG_DOMAIN_UST:
- {
- if (session->ust_session != NULL) {
- nb_event = list_lttng_ust_global_events(channel_name,
- &session->ust_session->domain_global, events);
+ } else if (string_match(optname, "consumerd32-path")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- break;
- }
- default:
- ret = -LTTCOMM_UND;
- goto error;
- }
-
- ret = nb_event;
-
-error:
- return ret;
-}
-
-/*
- * 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.
- */
-static int process_client_msg(struct command_ctx *cmd_ctx)
-{
- int ret = LTTCOMM_OK;
- int need_tracing_session = 1;
- int need_domain;
-
- DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
-
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_DESTROY_SESSION:
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_DOMAINS:
- case LTTNG_START_TRACE:
- case LTTNG_STOP_TRACE:
- need_domain = 0;
- break;
- default:
- need_domain = 1;
- }
-
- if (opt_no_kernel && need_domain
- && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
- if (!is_root) {
- ret = LTTCOMM_NEED_ROOT_SESSIOND;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--consumerd32-path");
} else {
- ret = LTTCOMM_KERN_NA;
+ config_string_set(&config.consumerd32_bin_path,
+ strdup(arg));
+ if (!config.consumerd32_bin_path.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
}
- goto error;
- }
-
- /*
- * 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;
+ } else if (string_match(optname, "consumerd32-libdir")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- }
-
- /* Commands that DO NOT need a session. */
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_CALIBRATE:
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_TRACEPOINTS:
- need_tracing_session = 0;
- break;
- default:
- DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
- /*
- * We keep the session list lock across _all_ commands
- * for now, because the per-session lock does not
- * handle teardown properly.
- */
- session_lock_list();
- cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
- if (cmd_ctx->session == NULL) {
- if (cmd_ctx->lsm->session.name != NULL) {
- ret = LTTCOMM_SESS_NOT_FOUND;
- } else {
- /* If no session name specified */
- ret = LTTCOMM_SELECT_SESS;
- }
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--consumerd32-libdir");
} else {
- /* Acquire lock for the session */
- session_lock(cmd_ctx->session);
+ config_string_set(&config.consumerd32_lib_dir,
+ strdup(arg));
+ if (!config.consumerd32_lib_dir.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
}
- break;
- }
-
- if (!need_domain) {
- goto skip_domain;
- }
- /*
- * Check domain type for specific "pre-action".
- */
- switch (cmd_ctx->lsm->domain.type) {
- case LTTNG_DOMAIN_KERNEL:
- if (!is_root) {
- ret = LTTCOMM_NEED_ROOT_SESSIOND;
- goto error;
+ } else if (string_match(optname, "consumerd64-path")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- /* Kernel tracer check */
- if (kernel_tracer_fd == -1) {
- /* Basically, load kernel tracer modules */
- ret = init_kernel_tracer();
- if (ret != 0) {
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--consumerd64-path");
+ } else {
+ config_string_set(&config.consumerd64_bin_path,
+ strdup(arg));
+ if (!config.consumerd64_bin_path.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
}
}
-
- /* Need a session for kernel command */
- 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 */
- pthread_mutex_lock(&kconsumer_data.pid_mutex);
- if (kconsumer_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&kconsumer_data.pid_mutex);
- ret = start_consumerd(&kconsumer_data);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
- } else {
- pthread_mutex_unlock(&kconsumer_data.pid_mutex);
- }
+ } else if (string_match(optname, "consumerd64-libdir")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- break;
- case LTTNG_DOMAIN_UST:
- {
- if (need_tracing_session) {
- if (cmd_ctx->session->ust_session == NULL) {
- ret = create_ust_session(cmd_ctx->session,
- &cmd_ctx->lsm->domain);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- }
- /* Start the UST consumer daemons */
- /* 64-bit */
- pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
- if (consumerd64_bin[0] != '\0' &&
- ustconsumer64_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
- ret = start_consumerd(&ustconsumer64_data);
- if (ret < 0) {
- ret = LTTCOMM_UST_CONSUMER64_FAIL;
- ust_consumerd64_fd = -EINVAL;
- goto error;
- }
-
- ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
- } else {
- pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
- }
- /* 32-bit */
- if (consumerd32_bin[0] != '\0' &&
- ustconsumer32_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
- ret = start_consumerd(&ustconsumer32_data);
- if (ret < 0) {
- ret = LTTCOMM_UST_CONSUMER32_FAIL;
- ust_consumerd32_fd = -EINVAL;
- goto error;
- }
- ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
- } else {
- pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--consumerd64-libdir");
+ } else {
+ config_string_set(&config.consumerd64_lib_dir,
+ strdup(arg));
+ if (!config.consumerd64_lib_dir.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
}
}
- break;
- }
- default:
- break;
- }
-skip_domain:
-
- /*
- * Check that the UID or GID match that of the tracing session.
- * The root user can interact with all sessions.
- */
- if (need_tracing_session) {
- if (!session_access_ok(cmd_ctx->session,
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
- ret = LTTCOMM_EPERM;
- goto error;
+ } else if (string_match(optname, "pidfile") || opt == 'p') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
- }
-
- /* 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_DISABLE_CHANNEL:
- {
- ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.disable.channel_name);
- break;
- }
- case LTTNG_DISABLE_EVENT:
- {
- 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);
- break;
- }
- case LTTNG_DISABLE_ALL_EVENT:
- {
- DBG("Disabling all events");
-
- ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.disable.channel_name);
- break;
- }
- case LTTNG_ENABLE_CHANNEL:
- {
- ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- &cmd_ctx->lsm->u.channel.chan);
- break;
- }
- case LTTNG_ENABLE_EVENT:
- {
- 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_ENABLE_ALL_EVENT:
- {
- DBG("Enabling all events");
-
- 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_TRACEPOINTS:
- {
- struct lttng_event *events;
- ssize_t nb_events;
-
- nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
- if (nb_events < 0) {
- ret = -nb_events;
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-p, --pidfile");
+ } else {
+ config_string_set(&config.pid_file_path, strdup(arg));
+ if (!config.pid_file_path.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
}
-
- /*
- * 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;
+ } else if (string_match(optname, "agent-tcp-port")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--agent-tcp-port");
+ } else {
+ unsigned long v;
- /* 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 LTTNG_START_TRACE:
- {
- 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, &cmd_ctx->creds);
- break;
- }
- case LTTNG_DESTROY_SESSION:
- {
- ret = cmd_destroy_session(cmd_ctx->session,
- cmd_ctx->lsm->session.name);
- /*
- * Set session to NULL so we do not unlock it after
- * free.
- */
- cmd_ctx->session = NULL;
- break;
- }
- case LTTNG_LIST_DOMAINS:
- {
- ssize_t nb_dom;
- struct lttng_domain *domains;
-
- nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
- if (nb_dom < 0) {
- ret = -nb_dom;
- goto error;
+ errno = 0;
+ v = strtoul(arg, NULL, 0);
+ if (errno != 0 || !isdigit(arg[0])) {
+ ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
+ return -1;
+ }
+ if (v == 0 || v >= 65535) {
+ ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
+ return -1;
+ }
+ config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v;
+ DBG3("Agent TCP port set to non default: %i", (int) v);
}
-
- ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
- if (ret < 0) {
- goto setup_error;
+ } else if (string_match(optname, "load") || opt == 'l') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- /* 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 LTTNG_LIST_CHANNELS:
- {
- size_t nb_chan;
- struct lttng_channel *channels;
-
- nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
- cmd_ctx->session, &channels);
- if (nb_chan < 0) {
- ret = -nb_chan;
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-l, --load");
+ } else {
+ config_string_set(&config.load_session_path, strdup(arg));
+ if (!config.load_session_path.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
}
-
- ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
- if (ret < 0) {
- goto setup_error;
+ } else if (string_match(optname, "kmod-probes")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- /* 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 LTTNG_LIST_EVENTS:
- {
- ssize_t nb_event;
- struct lttng_event *events = NULL;
-
- nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
- cmd_ctx->lsm->u.list.channel_name, &events);
- if (nb_event < 0) {
- ret = -nb_event;
- goto error;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--kmod-probes");
+ } else {
+ config_string_set(&config.kmod_probes_list, strdup(arg));
+ if (!config.kmod_probes_list.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
}
-
- ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
- if (ret < 0) {
- goto setup_error;
+ } else if (string_match(optname, "extra-kmod-probes")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
}
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, events,
- nb_event * sizeof(struct lttng_event));
-
- free(events);
-
- ret = LTTCOMM_OK;
- break;
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "--extra-kmod-probes");
+ } else {
+ config_string_set(&config.kmod_extra_probes_list,
+ strdup(arg));
+ if (!config.kmod_extra_probes_list.value) {
+ PERROR("strdup");
+ ret = -ENOMEM;
+ }
+ }
+ } else if (string_match(optname, "config") || opt == 'f') {
+ /* This is handled in set_options() thus silent skip. */
+ goto end;
+ } else {
+ /* Unknown option or other error.
+ * Error is printed by getopt, just return */
+ ret = -1;
}
- case LTTNG_LIST_SESSIONS:
- {
- unsigned int nr_sessions;
-
- session_lock_list();
- nr_sessions = lttng_sessions_count(
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
- ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
- if (ret < 0) {
- session_unlock_list();
- goto setup_error;
+end:
+ if (ret == -EINVAL) {
+ const char *opt_name = "unknown";
+ int i;
+
+ for (i = 0; i < sizeof(long_options) / sizeof(struct option);
+ i++) {
+ if (opt == long_options[i].val) {
+ opt_name = long_options[i].name;
+ break;
+ }
}
- /* Filled the session array */
- list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
-
- 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:
- ret = LTTCOMM_UND;
- break;
+ WARN("Invalid argument provided for option \"%s\", using default value.",
+ opt_name);
}
-error:
- if (cmd_ctx->llm == NULL) {
- DBG("Missing llm structure. Allocating one.");
- if (setup_lttng_msg(cmd_ctx, 0) < 0) {
- goto setup_error;
- }
- }
- /* Set return code */
- cmd_ctx->llm->ret_code = ret;
-setup_error:
- if (cmd_ctx->session) {
- session_unlock(cmd_ctx->session);
- }
- if (need_tracing_session) {
- session_unlock_list();
- }
-init_setup_error:
return ret;
}
/*
- * This thread manage all clients request using the unix client socket for
- * communication.
+ * config_entry_handler_cb used to handle options read from a config file.
+ * See config_entry_handler_cb comment in common/config/session-config.h for the
+ * return value conventions.
*/
-static void *thread_manage_clients(void *data)
+static int config_entry_handler(const struct config_entry *entry, void *unused)
{
- int sock = -1, ret, i, pollfd;
- uint32_t revents, nb_fd;
- struct command_ctx *cmd_ctx = NULL;
- struct lttng_poll_event events;
-
- DBG("[thread] Manage client started");
+ int ret = 0, i;
- rcu_register_thread();
-
- ret = lttcomm_listen_unix_sock(client_sock);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * 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;
+ if (!entry || !entry->name || !entry->value) {
+ ret = -EINVAL;
+ goto end;
}
- /*
- * Notify parent pid that we are ready to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGUSR1);
+ /* Check if the option is to be ignored */
+ for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
+ if (!strcmp(entry->name, config_ignore_options[i])) {
+ goto end;
+ }
}
- while (1) {
- DBG("Accepting client command ...");
-
- nb_fd = LTTNG_POLL_GETNB(&events);
+ for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
+ i++) {
- /* Inifinite blocking call, waiting for transmission */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
+ /* Ignore if not fully matched. */
+ if (strcmp(entry->name, long_options[i].name)) {
+ 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;
- }
-
- /* Event on the registration socket */
- if (pollfd == client_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Client socket poll error");
- goto error;
+ /*
+ * If the option takes no argument on the command line, we have to
+ * check if the value is "true". We support non-zero numeric values,
+ * true, on and yes.
+ */
+ if (!long_options[i].has_arg) {
+ ret = config_parse_value(entry->value);
+ if (ret <= 0) {
+ if (ret) {
+ WARN("Invalid configuration value \"%s\" for option %s",
+ entry->value, entry->name);
}
+ /* False, skip boolean config option. */
+ goto end;
}
}
- DBG("Wait for client response");
-
- sock = lttcomm_accept_unix_sock(client_sock);
- if (sock < 0) {
- goto error;
- }
-
- /* Set socket option for credentials retrieval */
- ret = lttcomm_setsockopt_creds_unix_sock(sock);
- if (ret < 0) {
- goto error;
- }
+ ret = set_option(long_options[i].val, entry->value, entry->name);
+ goto end;
+ }
- /* Allocate context command to process the client request */
- cmd_ctx = zmalloc(sizeof(struct command_ctx));
- if (cmd_ctx == NULL) {
- PERROR("zmalloc cmd_ctx");
- goto error;
- }
+ WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
- /* Allocate data buffer for reception */
- cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
- if (cmd_ctx->lsm == NULL) {
- PERROR("zmalloc cmd_ctx->lsm");
- goto error;
- }
+end:
+ return ret;
+}
- cmd_ctx->llm = NULL;
- cmd_ctx->session = NULL;
+static void print_version(void) {
+ fprintf(stdout, "%s\n", VERSION);
+}
- /*
- * Data is received from the lttng client. The struct
- * lttcomm_session_msg (lsm) contains the command and data request of
- * the client.
- */
- DBG("Receiving data from client ...");
- ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
- sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
- if (ret <= 0) {
- DBG("Nothing recv() from client... continuing");
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- sock = -1;
- clean_command_ctx(&cmd_ctx);
- continue;
- }
+/*
+ * daemon configuration loading and argument parsing
+ */
+static int set_options(int argc, char **argv)
+{
+ int ret = 0, c = 0, option_index = 0;
+ int orig_optopt = optopt, orig_optind = optind;
+ char *optstring;
+ const char *config_path = NULL;
- // TODO: Validate cmd_ctx including sanity check for
- // security purpose.
+ optstring = utils_generate_optstring(long_options,
+ sizeof(long_options) / sizeof(struct option));
+ if (!optstring) {
+ ret = -ENOMEM;
+ goto end;
+ }
- rcu_thread_online();
- /*
- * This function dispatch the work to the kernel or userspace tracer
- * libs and fill the lttcomm_lttng_msg data structure of all the needed
- * informations for the client. The command context struct contains
- * everything this function may needs.
- */
- ret = process_client_msg(cmd_ctx);
- rcu_thread_offline();
- if (ret < 0) {
- /*
- * TODO: Inform client somehow of the fatal error. At
- * this point, ret < 0 means that a zmalloc failed
- * (ENOMEM). Error detected but still accept command.
- */
- clean_command_ctx(&cmd_ctx);
+ /* Check for the --config option */
+ while ((c = getopt_long(argc, argv, optstring, long_options,
+ &option_index)) != -1) {
+ if (c == '?') {
+ ret = -EINVAL;
+ goto end;
+ } else if (c != 'f') {
+ /* if not equal to --config option. */
continue;
}
- DBG("Sending response (size: %d, retcode: %s)",
- cmd_ctx->lttng_msg_size,
- lttng_strerror(-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");
- }
-
- /* End of transmission */
- ret = close(sock);
- if (ret) {
- PERROR("close");
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-f, --config");
+ } else {
+ config_path = utils_expand_path(optarg);
+ if (!config_path) {
+ ERR("Failed to resolve path: %s", optarg);
+ }
}
- sock = -1;
-
- clean_command_ctx(&cmd_ctx);
}
-error:
- DBG("Client thread dying");
- unlink(client_unix_sock_path);
- if (client_sock >= 0) {
- ret = close(client_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
+ ret = config_get_section_entries(config_path, config_section_name,
+ config_entry_handler, NULL);
+ if (ret) {
+ if (ret > 0) {
+ ERR("Invalid configuration option at line %i", ret);
+ ret = -1;
}
+ goto end;
}
- lttng_poll_clean(&events);
- clean_command_ctx(&cmd_ctx);
-
- rcu_unregister_thread();
- return NULL;
-}
-
-
-/*
- * usage function on stderr
- */
-static void usage(void)
-{
- fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
- fprintf(stderr, " -h, --help Display this usage.\n");
- fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
- fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
- fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
- fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
- fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
- fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
- fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
- fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
- fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
- fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
- fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
- fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
- fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
- fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
- fprintf(stderr, " -V, --version Show version number.\n");
- 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-consumer Verbose mode for consumer. Activate DBG() macro.\n");
- fprintf(stderr, " --no-kernel Disable kernel tracer\n");
-}
-
-/*
- * daemon argument parsing
- */
-static int parse_args(int argc, char **argv)
-{
- int c;
-
- static struct option long_options[] = {
- { "client-sock", 1, 0, 'c' },
- { "apps-sock", 1, 0, 'a' },
- { "kconsumerd-cmd-sock", 1, 0, 'C' },
- { "kconsumerd-err-sock", 1, 0, 'E' },
- { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
- { "ustconsumerd32-err-sock", 1, 0, 'H' },
- { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
- { "ustconsumerd64-err-sock", 1, 0, 'F' },
- { "consumerd32-path", 1, 0, 'u' },
- { "consumerd32-libdir", 1, 0, 'U' },
- { "consumerd64-path", 1, 0, 't' },
- { "consumerd64-libdir", 1, 0, 'T' },
- { "daemonize", 0, 0, 'd' },
- { "sig-parent", 0, 0, 'S' },
- { "help", 0, 0, 'h' },
- { "group", 1, 0, 'g' },
- { "version", 0, 0, 'V' },
- { "quiet", 0, 0, 'q' },
- { "verbose", 0, 0, 'v' },
- { "verbose-consumer", 0, 0, 'Z' },
- { "no-kernel", 0, 0, 'N' },
- { NULL, 0, 0, 0 }
- };
-
+ /* Reset getopt's global state */
+ optopt = orig_optopt;
+ optind = orig_optind;
while (1) {
- int option_index = 0;
- c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
- long_options, &option_index);
+ option_index = -1;
+ /*
+ * getopt_long() will not set option_index if it encounters a
+ * short option.
+ */
+ c = getopt_long(argc, argv, optstring, long_options,
+ &option_index);
if (c == -1) {
break;
}
- switch (c) {
- case 0:
- fprintf(stderr, "option %s", long_options[option_index].name);
- if (optarg) {
- fprintf(stderr, " with arg %s\n", optarg);
- }
- break;
- case 'c':
- snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'a':
- snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'd':
- opt_daemon = 1;
- break;
- case 'g':
- opt_tracing_group = optarg;
- break;
- case 'h':
- usage();
- exit(EXIT_FAILURE);
- case 'V':
- fprintf(stdout, "%s\n", VERSION);
- exit(EXIT_SUCCESS);
- case 'S':
- opt_sig_parent = 1;
- break;
- case 'E':
- snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'C':
- snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'F':
- snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'D':
- snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'H':
- snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'G':
- snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'N':
- opt_no_kernel = 1;
- break;
- case 'q':
- lttng_opt_quiet = 1;
- break;
- case 'v':
- /* Verbose level can increase using multiple -v */
- lttng_opt_verbose += 1;
- break;
- case 'Z':
- opt_verbose_consumer += 1;
- break;
- case 'u':
- consumerd32_bin= optarg;
- break;
- case 'U':
- consumerd32_libdir = optarg;
- break;
- case 't':
- consumerd64_bin = optarg;
- break;
- case 'T':
- consumerd64_libdir = optarg;
+ /*
+ * Pass NULL as the long option name if popt left the index
+ * unset.
+ */
+ ret = set_option(c, optarg,
+ option_index < 0 ? NULL :
+ long_options[option_index].name);
+ if (ret < 0) {
break;
- default:
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- return -1;
}
}
- return 0;
+end:
+ free(optstring);
+ return ret;
}
/*
- * 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).
+ * Create lockfile using the rundir and return its fd.
*/
-static int init_daemon_socket(void)
+static int create_lockfile(void)
{
- int ret = 0;
- mode_t old_umask;
-
- old_umask = umask(0);
-
- /* Create client tool unix socket */
- client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
- if (client_sock < 0) {
- ERR("Create unix sock failed: %s", client_unix_sock_path);
- ret = -1;
- goto end;
- }
+ return utils_create_lock_file(config.lock_file_path.value);
+}
- /* File permission MUST be 660 */
- ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", client_unix_sock_path);
- PERROR("chmod");
- goto end;
- }
+/*
+ * Check if the global socket is available, and if a daemon is answering at the
+ * other side. If yes, error is returned.
+ *
+ * Also attempts to create and hold the lock file.
+ */
+static int check_existing_daemon(void)
+{
+ int ret = 0;
- /* Create the application unix socket */
- apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
- if (apps_sock < 0) {
- ERR("Create unix sock failed: %s", apps_unix_sock_path);
- ret = -1;
+ /* Is there anybody out there ? */
+ if (lttng_session_daemon_alive()) {
+ ret = -EEXIST;
goto end;
}
- /* File permission MUST be 666 */
- 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");
+ lockfile_fd = create_lockfile();
+ if (lockfile_fd < 0) {
+ ret = -EEXIST;
goto end;
}
-
end:
- umask(old_umask);
return ret;
}
-/*
- * 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(void)
+static void sessiond_cleanup_lock_file(void)
{
- /* Is there anybody out there ? */
- if (lttng_session_daemon_alive()) {
- return -EEXIST;
- }
+ int ret;
- return 0;
+ /*
+ * Cleanup lock file by deleting it and finaly closing it which will
+ * release the file system lock.
+ */
+ if (lockfile_fd >= 0) {
+ ret = remove(config.lock_file_path.value);
+ if (ret < 0) {
+ PERROR("remove lock file");
+ }
+ ret = close(lockfile_fd);
+ if (ret < 0) {
+ PERROR("close lock file");
+ }
+ }
}
/*
int ret;
gid_t gid;
- gid = allowed_group();
- if (gid < 0) {
- WARN("No tracing group detected");
- ret = 0;
- goto end;
+ ret = utils_get_group_id(config.tracing_group_name.value, true, &gid);
+ if (ret) {
+ /* Default to root group. */
+ gid = 0;
}
/* Set lttng run dir */
PERROR("chown");
}
- /* Ensure tracing group can search the run dir */
- ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
+ /*
+ * Ensure all applications and tracing group can search the run
+ * dir. Allow everyone to read the directory, since it does not
+ * buy us anything to hide its content.
+ */
+ ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
if (ret < 0) {
ERR("Unable to set permissions on %s", rundir);
PERROR("chmod");
}
/* lttng client socket path */
- ret = chown(client_unix_sock_path, 0, gid);
+ ret = chown(config.client_unix_sock_path.value, 0, gid);
if (ret < 0) {
- ERR("Unable to set group on %s", client_unix_sock_path);
+ ERR("Unable to set group on %s", config.client_unix_sock_path.value);
PERROR("chown");
}
/* kconsumer error socket path */
- ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
+ ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
if (ret < 0) {
ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
PERROR("chown");
}
/* 64-bit ustconsumer error socket path */
- ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
+ ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
if (ret < 0) {
ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
PERROR("chown");
}
/* 32-bit ustconsumer compat32 error socket path */
- ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
+ ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
if (ret < 0) {
ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
PERROR("chown");
DBG("All permissions are set");
-end:
- return ret;
-}
-
-/*
- * Create the pipe used to wake up the kernel thread.
- * Closed in cleanup().
- */
-static int create_kernel_poll_pipe(void)
-{
- int ret, i;
-
- ret = pipe(kernel_poll_pipe);
- if (ret < 0) {
- PERROR("kernel poll pipe");
- goto error;
- }
-
- for (i = 0; i < 2; i++) {
- ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl kernel_poll_pipe");
- goto error;
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Create the application command pipe to wake thread_manage_apps.
- * Closed in cleanup().
- */
-static int create_apps_cmd_pipe(void)
-{
- int ret, i;
-
- ret = pipe(apps_cmd_pipe);
- if (ret < 0) {
- PERROR("apps cmd pipe");
- goto error;
- }
-
- for (i = 0; i < 2; i++) {
- ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl apps_cmd_pipe");
- goto error;
- }
- }
-
-error:
return ret;
}
/*
* Create the lttng run directory needed for all global sockets and pipe.
*/
-static int create_lttng_rundir(const char *rundir)
+static int create_lttng_rundir(void)
{
int ret;
- DBG3("Creating LTTng run directory: %s", rundir);
+ DBG3("Creating LTTng run directory: %s", config.rundir.value);
- ret = mkdir(rundir, S_IRWXU);
+ ret = mkdir(config.rundir.value, S_IRWXU);
if (ret < 0) {
if (errno != EEXIST) {
- ERR("Unable to create %s", rundir);
+ ERR("Unable to create %s", config.rundir.value);
goto error;
} else {
ret = 0;
}
/*
- * Setup sockets and directory needed by the kconsumerd communication with the
+ * Setup sockets and directory needed by the consumerds' communication with the
* session daemon.
*/
-static int set_consumer_sockets(struct consumer_data *consumer_data,
- const char *rundir)
+static int set_consumer_sockets(struct consumer_data *consumer_data)
{
int ret;
- char path[PATH_MAX];
+ char *path = NULL;
- switch (consumer_data->type) {
+ switch (consumer_data->type) {
case LTTNG_CONSUMER_KERNEL:
- snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
+ path = config.kconsumerd_path.value;
break;
case LTTNG_CONSUMER64_UST:
- snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
+ path = config.consumerd64_path.value;
break;
case LTTNG_CONSUMER32_UST:
- snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
+ path = config.consumerd32_path.value;
break;
default:
ERR("Consumer type unknown");
ret = -EINVAL;
goto error;
}
+ assert(path);
DBG2("Creating consumer directory: %s", path);
- ret = mkdir(path, S_IRWXU);
- if (ret < 0) {
- if (errno != EEXIST) {
- PERROR("mkdir");
- ERR("Failed to create %s", path);
+ ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
+ if (ret < 0 && errno != EEXIST) {
+ PERROR("mkdir");
+ ERR("Failed to create %s", path);
+ goto error;
+ }
+ if (is_root) {
+ gid_t gid;
+
+ ret = utils_get_group_id(config.tracing_group_name.value, true,
+ &gid);
+ if (ret) {
+ /* Default to root group. */
+ gid = 0;
+ }
+
+ ret = chown(path, 0, gid);
+ if (ret < 0) {
+ ERR("Unable to set group on %s", path);
+ PERROR("chown");
goto error;
}
- ret = -1;
}
- /* Create the kconsumerd error unix socket */
+ /* Create the consumerd error unix socket */
consumer_data->err_sock =
lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
if (consumer_data->err_sock < 0) {
goto error;
}
+ /*
+ * Set the CLOEXEC flag. Return code is useless because either way, the
+ * show must go on.
+ */
+ ret = utils_set_fd_cloexec(consumer_data->err_sock);
+ if (ret < 0) {
+ PERROR("utils_set_fd_cloexec");
+ /* continue anyway */
+ }
+
/* File permission MUST be 660 */
ret = chmod(consumer_data->err_unix_sock_path,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
static void sighandler(int sig)
{
switch (sig) {
- case SIGPIPE:
- DBG("SIGPIPE caught");
- return;
case SIGINT:
DBG("SIGINT caught");
stop_threads();
DBG("SIGTERM caught");
stop_threads();
break;
+ case SIGUSR1:
+ CMM_STORE_SHARED(recv_child_signal, 1);
+ break;
default:
break;
}
return ret;
}
- sa.sa_handler = sighandler;
sa.sa_mask = sigset;
sa.sa_flags = 0;
+
+ sa.sa_handler = sighandler;
if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
PERROR("sigaction");
return ret;
return ret;
}
+ if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
+ PERROR("sigaction");
+ return ret;
+ }
+
+ sa.sa_handler = SIG_IGN;
if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
PERROR("sigaction");
return ret;
}
- DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
+ DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
return ret;
}
/*
* Set open files limit to unlimited. This daemon can open a large number of
- * file descriptors in order to consumer multiple kernel traces.
+ * file descriptors in order to consume multiple kernel traces.
*/
static void set_ulimit(void)
{
int ret;
struct rlimit lim;
- /* The kernel does not allowed an infinite limit for open files */
+ /* The kernel does not allow an infinite limit for open files */
lim.rlim_cur = 65535;
lim.rlim_max = 65535;
}
}
+static int write_pidfile(void)
+{
+ return utils_create_pid_file(getpid(), config.pid_file_path.value);
+}
+
+static int set_clock_plugin_env(void)
+{
+ int ret = 0;
+ char *env_value = NULL;
+
+ if (!config.lttng_ust_clock_plugin.value) {
+ goto end;
+ }
+
+ ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
+ config.lttng_ust_clock_plugin.value);
+ if (ret < 0) {
+ PERROR("asprintf");
+ goto end;
+ }
+
+ ret = putenv(env_value);
+ if (ret) {
+ free(env_value);
+ PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
+ goto end;
+ }
+
+ DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
+ config.lttng_ust_clock_plugin.value);
+end:
+ return ret;
+}
+
+static void destroy_all_sessions_and_wait(void)
+{
+ struct ltt_session *session, *tmp;
+ struct ltt_session_list *session_list;
+
+ session_list = session_get_list();
+ DBG("Initiating destruction of all sessions");
+
+ if (!session_list) {
+ return;
+ }
+
+ session_lock_list();
+ /* Initiate the destruction of all sessions. */
+ cds_list_for_each_entry_safe(session, tmp,
+ &session_list->head, list) {
+ if (!session_get(session)) {
+ continue;
+ }
+
+ session_lock(session);
+ if (session->destroyed) {
+ goto unlock_session;
+ }
+ (void) cmd_stop_trace(session);
+ (void) cmd_destroy_session(session, notification_thread_handle,
+ NULL);
+ unlock_session:
+ session_unlock(session);
+ session_put(session);
+ }
+ session_unlock_list();
+
+ /* Wait for the destruction of all sessions to complete. */
+ DBG("Waiting for the destruction of all sessions to complete");
+ session_list_wait_empty();
+ DBG("Destruction of all sessions completed");
+}
+
+static int run_as_worker_post_fork_cleanup(void *data)
+{
+ struct sessiond_config *sessiond_config = data;
+
+ sessiond_config_fini(sessiond_config);
+ return 0;
+}
+
+static int launch_run_as_worker(const char *procname)
+{
+ /*
+ * Clean-up before forking the run-as worker. Any dynamically
+ * allocated memory of which the worker is not aware will
+ * be leaked as the process forks a run-as worker (and performs
+ * no exec*()). The same would apply to any opened fd.
+ */
+ return run_as_create_worker(procname, run_as_worker_post_fork_cleanup,
+ &config);
+}
+
+static void sessiond_uuid_log(void)
+{
+ char uuid_str[LTTNG_UUID_STR_LEN];
+
+ lttng_uuid_to_str(sessiond_uuid, uuid_str);
+ DBG("Starting lttng-sessiond {%s}", uuid_str);
+}
+
/*
* main
*/
int main(int argc, char **argv)
{
- int ret = 0;
- void *status;
- const char *home_path;
+ int ret = 0, retval = 0;
+ const char *env_app_timeout;
+ struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
+ *ust64_channel_monitor_pipe = NULL,
+ *kernel_channel_monitor_pipe = NULL;
+ struct lttng_thread *ht_cleanup_thread = NULL;
+ struct timer_thread_parameters timer_thread_parameters;
+ /* Rotation thread handle. */
+ struct rotation_thread_handle *rotation_thread_handle = NULL;
+ /* Queue of rotation jobs populated by the sessiond-timer. */
+ struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
+ struct lttng_thread *client_thread = NULL;
+ struct lttng_thread *notification_thread = NULL;
+ struct lttng_thread *register_apps_thread = NULL;
init_kernel_workarounds();
rcu_register_thread();
- /* Create thread quit pipe */
- if ((ret = init_thread_quit_pipe()) < 0) {
- goto error;
+ if (set_signal_handler()) {
+ retval = -1;
+ goto exit_set_signal_handler;
}
- setup_consumerd_path();
+ if (timer_signal_init()) {
+ retval = -1;
+ goto exit_set_signal_handler;
+ }
- /* Parse arguments */
- progname = argv[0];
- if ((ret = parse_args(argc, argv) < 0)) {
- goto error;
+ page_size = sysconf(_SC_PAGESIZE);
+ if (page_size < 0) {
+ PERROR("sysconf _SC_PAGESIZE");
+ page_size = LONG_MAX;
+ WARN("Fallback page size to %ld", page_size);
}
- /* Daemonize */
- if (opt_daemon) {
- ret = daemon(0, 0);
- if (ret < 0) {
- PERROR("daemon");
- goto error;
- }
+ ret = sessiond_config_init(&config);
+ if (ret) {
+ retval = -1;
+ goto exit_set_signal_handler;
}
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
+ /*
+ * Init config from environment variables.
+ * Command line option override env configuration per-doc. Do env first.
+ */
+ sessiond_config_apply_env_config(&config);
- if (is_root) {
- rundir = strdup(DEFAULT_LTTNG_RUNDIR);
+ /*
+ * Parse arguments and load the daemon configuration file.
+ *
+ * We have an exit_options exit path to free memory reserved by
+ * set_options. This is needed because the rest of sessiond_cleanup()
+ * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
+ * depends on set_options.
+ */
+ progname = argv[0];
+ if (set_options(argc, argv)) {
+ retval = -1;
+ goto exit_options;
+ }
- /* Create global run dir with root access */
- ret = create_lttng_rundir(rundir);
- if (ret < 0) {
- goto error;
- }
+ /*
+ * Resolve all paths received as arguments, configuration option, or
+ * through environment variable as absolute paths. This is necessary
+ * since daemonizing causes the sessiond's current working directory
+ * to '/'.
+ */
+ ret = sessiond_config_resolve_paths(&config);
+ if (ret) {
+ goto exit_options;
+ }
- if (strlen(apps_unix_sock_path) == 0) {
- snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_UNIX_SOCK);
- }
+ /* Apply config. */
+ lttng_opt_verbose = config.verbose;
+ lttng_opt_quiet = config.quiet;
+ kconsumer_data.err_unix_sock_path =
+ config.kconsumerd_err_unix_sock_path.value;
+ kconsumer_data.cmd_unix_sock_path =
+ config.kconsumerd_cmd_unix_sock_path.value;
+ ustconsumer32_data.err_unix_sock_path =
+ config.consumerd32_err_unix_sock_path.value;
+ ustconsumer32_data.cmd_unix_sock_path =
+ config.consumerd32_cmd_unix_sock_path.value;
+ ustconsumer64_data.err_unix_sock_path =
+ config.consumerd64_err_unix_sock_path.value;
+ ustconsumer64_data.cmd_unix_sock_path =
+ config.consumerd64_cmd_unix_sock_path.value;
+ set_clock_plugin_env();
- if (strlen(client_unix_sock_path) == 0) {
- snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
- }
+ sessiond_config_log(&config);
+ sessiond_uuid_log();
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
- }
+ if (opt_print_version) {
+ print_version();
+ retval = 0;
+ goto exit_options;
+ }
+
+ if (create_lttng_rundir()) {
+ retval = -1;
+ goto exit_options;
+ }
- /* Setup kernel consumerd path */
- snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
- snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
+ /* Abort launch if a session daemon is already running. */
+ if (check_existing_daemon()) {
+ ERR("A session daemon is already running.");
+ retval = -1;
+ goto exit_options;
+ }
- DBG2("Kernel consumer err path: %s",
- kconsumer_data.err_unix_sock_path);
- DBG2("Kernel consumer cmd path: %s",
- kconsumer_data.cmd_unix_sock_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;
+ /* Daemonize */
+ if (config.daemonize || config.background) {
+ int i;
+
+ ret = lttng_daemonize(&child_ppid, &recv_child_signal,
+ !config.background);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_options;
}
/*
- * Create rundir from home path. This will create something like
- * $HOME/.lttng
+ * We are in the child. Make sure all other file descriptors are
+ * closed, in case we are called with more opened file
+ * descriptors than the standard ones and the lock file.
*/
- ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
- if (ret < 0) {
- ret = -ENOMEM;
- goto error;
+ for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
+ if (i == lockfile_fd) {
+ continue;
+ }
+ (void) close(i);
}
+ }
- ret = create_lttng_rundir(rundir);
- if (ret < 0) {
- goto error;
- }
+ if (launch_run_as_worker(argv[0]) < 0) {
+ goto exit_create_run_as_worker_cleanup;
+ }
- if (strlen(apps_unix_sock_path) == 0) {
- snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
- }
+ /*
+ * Starting from here, we can create threads. This needs to be after
+ * lttng_daemonize due to RCU.
+ */
- /* 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, home_path);
- }
+ /*
+ * Initialize the health check subsystem. This call should set the
+ * appropriate time values.
+ */
+ health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
+ if (!health_sessiond) {
+ PERROR("health_app_create error");
+ retval = -1;
+ goto stop_threads;
+ }
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
- }
+ /* Create thread to clean up RCU hash tables */
+ ht_cleanup_thread = launch_ht_cleanup_thread();
+ if (!ht_cleanup_thread) {
+ retval = -1;
+ goto stop_threads;
}
- DBG("Client socket path %s", client_unix_sock_path);
- DBG("Application socket path %s", apps_unix_sock_path);
- DBG("LTTng run directory path: %s", rundir);
+ /* Create thread quit pipe */
+ if (sessiond_init_thread_quit_pipe()) {
+ retval = -1;
+ goto stop_threads;
+ }
- /* 32 bits consumerd path setup */
- snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
- snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
+ /* Check if daemon is UID = 0 */
+ is_root = !getuid();
+ if (is_root) {
+ /* Create global run dir with root access */
- DBG2("UST consumer 32 bits err path: %s",
- ustconsumer32_data.err_unix_sock_path);
- DBG2("UST consumer 32 bits cmd path: %s",
- ustconsumer32_data.cmd_unix_sock_path);
+ kernel_channel_monitor_pipe = lttng_pipe_open(0);
+ if (!kernel_channel_monitor_pipe) {
+ ERR("Failed to create kernel consumer channel monitor pipe");
+ retval = -1;
+ goto stop_threads;
+ }
+ kconsumer_data.channel_monitor_pipe =
+ lttng_pipe_release_writefd(
+ kernel_channel_monitor_pipe);
+ if (kconsumer_data.channel_monitor_pipe < 0) {
+ retval = -1;
+ goto stop_threads;
+ }
+ }
- /* 64 bits consumerd path setup */
- snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
- snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
+ /* Set consumer initial state */
+ kernel_consumerd_state = CONSUMER_STOPPED;
+ ust_consumerd_state = CONSUMER_STOPPED;
- DBG2("UST consumer 64 bits err path: %s",
- ustconsumer64_data.err_unix_sock_path);
- DBG2("UST consumer 64 bits cmd path: %s",
- ustconsumer64_data.cmd_unix_sock_path);
+ ust32_channel_monitor_pipe = lttng_pipe_open(0);
+ if (!ust32_channel_monitor_pipe) {
+ ERR("Failed to create 32-bit user space consumer channel monitor pipe");
+ retval = -1;
+ goto stop_threads;
+ }
+ ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd(
+ ust32_channel_monitor_pipe);
+ if (ustconsumer32_data.channel_monitor_pipe < 0) {
+ retval = -1;
+ goto stop_threads;
+ }
/*
- * See if daemon already exist.
+ * The rotation_thread_timer_queue structure is shared between the
+ * sessiond timer thread and the rotation thread. The main thread keeps
+ * its ownership and destroys it when both threads have been joined.
*/
- if ((ret = check_existing_daemon()) < 0) {
- ERR("Already running daemon.\n");
- /*
- * We do not goto exit because we must not cleanup()
- * because a daemon is already running.
- */
- goto error;
+ rotation_timer_queue = rotation_thread_timer_queue_create();
+ if (!rotation_timer_queue) {
+ retval = -1;
+ goto stop_threads;
+ }
+ timer_thread_parameters.rotation_thread_job_queue =
+ rotation_timer_queue;
+
+ ust64_channel_monitor_pipe = lttng_pipe_open(0);
+ if (!ust64_channel_monitor_pipe) {
+ ERR("Failed to create 64-bit user space consumer channel monitor pipe");
+ retval = -1;
+ goto stop_threads;
+ }
+ ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd(
+ ust64_channel_monitor_pipe);
+ if (ustconsumer64_data.channel_monitor_pipe < 0) {
+ retval = -1;
+ goto stop_threads;
}
/*
* Init UST app hash table. Alloc hash table before this point since
* cleanup() can get called after that point.
*/
- ust_app_ht_alloc();
+ if (ust_app_ht_alloc()) {
+ ERR("Failed to allocate UST app hash table");
+ retval = -1;
+ goto stop_threads;
+ }
- /* After this point, we can safely call cleanup() with "goto exit" */
+ /*
+ * Initialize agent app hash table. We allocate the hash table here
+ * since cleanup() can get called after this point.
+ */
+ if (agent_app_ht_alloc()) {
+ ERR("Failed to allocate Agent app hash table");
+ retval = -1;
+ goto stop_threads;
+ }
/*
* These actions must be executed as root. We do that *after* setting up
* kernel tracer.
*/
if (is_root) {
- ret = set_consumer_sockets(&kconsumer_data, rundir);
- if (ret < 0) {
- goto exit;
+ if (set_consumer_sockets(&kconsumer_data)) {
+ retval = -1;
+ goto stop_threads;
}
/* Setup kernel tracer */
- if (!opt_no_kernel) {
+ if (!config.no_kernel) {
init_kernel_tracer();
}
/* Set ulimit for open files */
set_ulimit();
}
+ /* init lttng_fd tracking must be done after set_ulimit. */
+ lttng_fd_init();
- ret = set_consumer_sockets(&ustconsumer64_data, rundir);
- if (ret < 0) {
- goto exit;
- }
-
- ret = set_consumer_sockets(&ustconsumer32_data, rundir);
- if (ret < 0) {
- goto exit;
- }
-
- if ((ret = set_signal_handler()) < 0) {
- goto exit;
+ if (set_consumer_sockets(&ustconsumer64_data)) {
+ retval = -1;
+ goto stop_threads;
}
- /* Setup the needed unix socket */
- if ((ret = init_daemon_socket()) < 0) {
- goto exit;
- }
-
- /* Set credentials to socket */
- if (is_root && ((ret = set_permissions(rundir)) < 0)) {
- goto exit;
+ if (set_consumer_sockets(&ustconsumer32_data)) {
+ retval = -1;
+ goto stop_threads;
}
/* Get parent pid if -S, --sig-parent is specified. */
- if (opt_sig_parent) {
+ if (config.sig_parent) {
ppid = getppid();
}
/* Setup the kernel pipe for waking up the kernel thread */
- if ((ret = create_kernel_poll_pipe()) < 0) {
- goto exit;
+ if (is_root && !config.no_kernel) {
+ if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
+ retval = -1;
+ goto stop_threads;
+ }
}
/* Setup the thread apps communication pipe. */
- if ((ret = create_apps_cmd_pipe()) < 0) {
- goto exit;
+ if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
+ retval = -1;
+ goto stop_threads;
+ }
+
+ /* Setup the thread apps notify communication pipe. */
+ if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
+ retval = -1;
+ goto stop_threads;
}
+ /* Initialize global buffer per UID and PID registry. */
+ buffer_reg_init_uid_registry();
+ buffer_reg_init_pid_registry();
+
/* Init UST command queue. */
- cds_wfq_init(&ust_cmd_queue.queue);
+ cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
- /*
- * Get session list pointer. This pointer MUST NOT be free(). This list is
- * statically declared in session.c
- */
- session_list_ptr = session_get_list();
+ cmd_init();
+
+ /* Check for the application socket timeout env variable. */
+ env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
+ if (env_app_timeout) {
+ config.app_socket_timeout = atoi(env_app_timeout);
+ } else {
+ config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
+ }
+
+ ret = write_pidfile();
+ if (ret) {
+ ERR("Error in write_pidfile");
+ retval = -1;
+ goto stop_threads;
+ }
+
+ /* Initialize communication library */
+ lttcomm_init();
+ /* Initialize TCP timeout values */
+ lttcomm_inet_init();
+
+ /* Create health-check thread. */
+ if (!launch_health_management_thread()) {
+ retval = -1;
+ goto stop_threads;
+ }
+
+ /* notification_thread_data acquires the pipes' read side. */
+ notification_thread_handle = notification_thread_handle_create(
+ ust32_channel_monitor_pipe,
+ ust64_channel_monitor_pipe,
+ kernel_channel_monitor_pipe);
+ if (!notification_thread_handle) {
+ retval = -1;
+ ERR("Failed to create notification thread shared data");
+ goto stop_threads;
+ }
+
+ /* Create notification thread. */
+ notification_thread = launch_notification_thread(
+ notification_thread_handle);
+ if (!notification_thread) {
+ retval = -1;
+ goto stop_threads;
+ }
+
+ /* Create timer thread. */
+ if (!launch_timer_thread(&timer_thread_parameters)) {
+ retval = -1;
+ goto stop_threads;
+ }
+
+ /* rotation_thread_data acquires the pipes' read side. */
+ rotation_thread_handle = rotation_thread_handle_create(
+ rotation_timer_queue,
+ notification_thread_handle);
+ if (!rotation_thread_handle) {
+ retval = -1;
+ ERR("Failed to create rotation thread shared data");
+ stop_threads();
+ goto stop_threads;
+ }
- /* Set up max poll set size */
- lttng_poll_set_max_size();
+ /* Create rotation thread. */
+ if (!launch_rotation_thread(rotation_thread_handle)) {
+ retval = -1;
+ goto stop_threads;
+ }
/* 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;
+ client_thread = launch_client_thread();
+ if (!client_thread) {
+ retval = -1;
+ goto stop_threads;
}
- /* 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;
+ /* Set credentials of the client socket and rundir */
+ if (is_root && set_permissions(config.rundir.value)) {
+ retval = -1;
+ goto stop_threads;
+ }
+
+ if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1],
+ apps_cmd_notify_pipe[1])) {
+ retval = -1;
+ goto stop_threads;
}
/* 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;
+ register_apps_thread = launch_application_registration_thread(
+ &ust_cmd_queue);
+ if (!register_apps_thread) {
+ retval = -1;
+ goto stop_threads;
}
/* 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;
+ if (!launch_application_management_thread(apps_cmd_pipe[0])) {
+ retval = -1;
+ goto stop_threads;
}
- /* 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;
+ /* Create thread to manage application notify socket */
+ if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) {
+ retval = -1;
+ goto stop_threads;
}
- ret = pthread_join(kernel_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join");
- goto error; /* join error, exit without cleanup */
+ /* Create agent management thread. */
+ if (!launch_agent_management_thread()) {
+ retval = -1;
+ goto stop_threads;
}
-exit_kernel:
- ret = pthread_join(apps_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join");
- goto error; /* join error, exit without cleanup */
+ /* Don't start this thread if kernel tracing is not requested nor root */
+ if (is_root && !config.no_kernel) {
+ /* Create kernel thread to manage kernel event */
+ if (!launch_kernel_management_thread(kernel_poll_pipe[0])) {
+ retval = -1;
+ goto stop_threads;
+ }
}
-exit_apps:
- ret = pthread_join(reg_apps_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join");
- goto error; /* join error, exit without cleanup */
+ /* Load sessions. */
+ ret = config_load_session(config.load_session_path.value,
+ NULL, 1, 1, NULL);
+ if (ret) {
+ ERR("Session load failed: %s", error_get_str(ret));
+ retval = -1;
+ goto stop_threads;
}
-exit_reg_apps:
- ret = pthread_join(dispatch_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
+ /* Initialization completed. */
+ sessiond_signal_parents();
+
+ /*
+ * This is where we start awaiting program completion (e.g. through
+ * signal that asks threads to teardown).
+ */
-exit_dispatch:
- ret = pthread_join(client_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join");
- goto error; /* join error, exit without cleanup */
+ /* Initiate teardown once activity occurs on the quit pipe. */
+ sessiond_wait_for_quit_pipe(-1);
+
+stop_threads:
+ /*
+ * Ensure that the client thread is no longer accepting new commands,
+ * which could cause new sessions to be created.
+ */
+ if (client_thread) {
+ lttng_thread_shutdown(client_thread);
+ lttng_thread_put(client_thread);
}
- ret = join_consumer_thread(&kconsumer_data);
- if (ret != 0) {
- PERROR("join_consumer");
- goto error; /* join error, exit without cleanup */
+ destroy_all_sessions_and_wait();
+
+ if (register_apps_thread) {
+ lttng_thread_shutdown(register_apps_thread);
+ lttng_thread_put(register_apps_thread);
}
+ lttng_thread_list_shutdown_orphans();
-exit_client:
-exit:
/*
- * cleanup() is called when no other thread is running.
+ * Wait for all pending call_rcu work to complete before tearing
+ * down data structures. call_rcu worker may be trying to
+ * perform lookups in those structures.
+ */
+ rcu_barrier();
+ /*
+ * sessiond_cleanup() is called when no other thread is running, except
+ * the ht_cleanup thread, which is needed to destroy the hash tables.
*/
rcu_thread_online();
- cleanup();
+ sessiond_cleanup();
+
+ if (notification_thread) {
+ lttng_thread_shutdown(notification_thread);
+ lttng_thread_put(notification_thread);
+ }
+
+ /*
+ * Ensure all prior call_rcu are done. call_rcu callbacks may push
+ * hash tables to the ht_cleanup thread. Therefore, we ensure that
+ * the queue is empty before shutting down the clean-up thread.
+ */
+ rcu_barrier();
+
+ if (ht_cleanup_thread) {
+ lttng_thread_shutdown(ht_cleanup_thread);
+ lttng_thread_put(ht_cleanup_thread);
+ }
+
rcu_thread_offline();
rcu_unregister_thread();
- if (!ret) {
+
+ if (rotation_thread_handle) {
+ rotation_thread_handle_destroy(rotation_thread_handle);
+ }
+
+ /*
+ * After the rotation and timer thread have quit, we can safely destroy
+ * the rotation_timer_queue.
+ */
+ rotation_thread_timer_queue_destroy(rotation_timer_queue);
+ /*
+ * The teardown of the notification system is performed after the
+ * session daemon's teardown in order to allow it to be notified
+ * of the active session and channels at the moment of the teardown.
+ */
+ if (notification_thread_handle) {
+ notification_thread_handle_destroy(notification_thread_handle);
+ }
+ lttng_pipe_destroy(ust32_channel_monitor_pipe);
+ lttng_pipe_destroy(ust64_channel_monitor_pipe);
+ lttng_pipe_destroy(kernel_channel_monitor_pipe);
+
+ if (health_sessiond) {
+ health_app_destroy(health_sessiond);
+ }
+exit_create_run_as_worker_cleanup:
+exit_options:
+ sessiond_cleanup_lock_file();
+ sessiond_cleanup_options();
+
+exit_set_signal_handler:
+ if (!retval) {
exit(EXIT_SUCCESS);
+ } else {
+ exit(EXIT_FAILURE);
}
-error:
- exit(EXIT_FAILURE);
}
projects / lttng-tools.git / blobdiff