+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_SOURCE
-#include <fcntl.h>
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <pthread.h>
-#include <semaphore.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <urcu/futex.h>
-#include <unistd.h>
-#include <config.h>
-
-#include <lttng-consumerd.h>
-#include <lttng-ht.h>
-#include <lttng-sessiond-comm.h>
-#include <lttng/lttng-consumer.h>
-
-#include <lttngerr.h>
-#include "common/runas.h"
-
-#include "channel.h"
-#include "compat/poll.h"
-#include "context.h"
-#include "event.h"
-#include "futex.h"
-#include "kernel.h"
-#include "lttng-sessiond.h"
-#include "shm.h"
-#include "ust-app.h"
-#include "ust-ctl.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[] = LTTNG_DEFAULT_TRACING_GROUP;
-const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
-const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
-
-/* Variables */
-int opt_verbose; /* Not static for lttngerr.h */
-int opt_verbose_consumer; /* Not static for lttngerr.h */
-int opt_quiet; /* Not static for lttngerr.h */
-
-const char *progname;
-const char *opt_tracing_group;
-static int opt_sig_parent;
-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 = KCONSUMERD_ERR_SOCK_PATH,
- .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
-};
-static struct consumer_data ustconsumer64_data = {
- .type = LTTNG_CONSUMER64_UST,
- .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
- .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
-};
-static struct consumer_data ustconsumer32_data = {
- .type = LTTNG_CONSUMER32_UST,
- .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
- .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
-};
-
-static int dispatch_thread_exit;
-
-/* Global application Unix socket path */
-static char apps_unix_sock_path[PATH_MAX];
-/* Global client Unix socket path */
-static char client_unix_sock_path[PATH_MAX];
-/* global wait shm path for UST */
-static char wait_shm_path[PATH_MAX];
-
-/* Sockets and FDs */
-static int client_sock;
-static int apps_sock;
-static int kernel_tracer_fd;
-static int kernel_poll_pipe[2];
-
-/*
- * Quit pipe for all threads. This permits a single cancellation point
- * for all threads when receiving an event on the pipe.
- */
-static int thread_quit_pipe[2];
-
-/*
- * This pipe is used to inform the thread managing application communication
- * that a command is queued and ready to be processed.
- */
-static int apps_cmd_pipe[2];
-
-/* Pthread, Mutexes and Semaphores */
-static pthread_t apps_thread;
-static pthread_t reg_apps_thread;
-static pthread_t client_thread;
-static pthread_t kernel_thread;
-static pthread_t dispatch_thread;
-
-
-/*
- * UST registration command queue. This queue is tied with a futex and uses a N
- * wakers / 1 waiter implemented and detailed in futex.c/.h
- *
- * The thread_manage_apps and thread_dispatch_ust_registration interact with
- * this queue and the wait/wake scheme.
- */
-static struct ust_cmd_queue ust_cmd_queue;
-
-/*
- * Pointer initialized before thread creation.
- *
- * This points to the tracing session list containing the session count and a
- * mutex lock. The lock MUST be taken if you iterate over the list. The lock
- * MUST NOT be taken if you call a public function in session.c.
- *
- * The lock is nested inside the structure: session_list_ptr->lock. Please use
- * session_lock_list and session_unlock_list for lock acquisition.
- */
-static struct ltt_session_list *session_list_ptr;
-
-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_TOOLS_CONSUMERD32_LIBDIR");
- if (libdir) {
- consumerd32_libdir = libdir;
- }
- libdir = getenv("LTTNG_TOOLS_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;
-}
-
-/*
- * Remove modules in reverse load order.
- */
-static int modprobe_remove_kernel_modules(void)
-{
- int ret = 0, i;
- char modprobe[256];
-
- for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
- ret = snprintf(modprobe, sizeof(modprobe),
- "/sbin/modprobe -r -q %s",
- kernel_modules_list[i].name);
- if (ret < 0) {
- perror("snprintf modprobe -r");
- goto error;
- }
- modprobe[sizeof(modprobe) - 1] = '\0';
- ret = system(modprobe);
- if (ret == -1) {
- ERR("Unable to launch modprobe -r for module %s",
- kernel_modules_list[i].name);
- } else if (kernel_modules_list[i].required
- && WEXITSTATUS(ret) != 0) {
- ERR("Unable to remove module %s",
- kernel_modules_list[i].name);
- } else {
- DBG("Modprobe removal successful %s",
- kernel_modules_list[i].name);
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Return group ID of the tracing group or -1 if not found.
- */
-static gid_t allowed_group(void)
-{
- struct group *grp;
-
- if (opt_tracing_group) {
- grp = getgrnam(opt_tracing_group);
- } else {
- grp = getgrnam(default_tracing_group);
- }
- if (!grp) {
- return -1;
- } else {
- return grp->gr_gid;
- }
-}
-
-/*
- * Init thread quit pipe.
- *
- * Return -1 on error or 0 if all pipes are created.
- */
-static int init_thread_quit_pipe(void)
-{
- int ret;
-
- ret = pipe2(thread_quit_pipe, O_CLOEXEC);
- if (ret < 0) {
- perror("thread quit pipe");
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Complete teardown of a kernel session. This free all data structure related
- * to a kernel session and update counter.
- */
-static void teardown_kernel_session(struct ltt_session *session)
-{
- if (!session->kernel_session) {
- DBG3("No kernel session when tearingdown 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 (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 :)
- */
-static void teardown_ust_session(struct ltt_session *session)
-{
- int ret;
-
- if (!session->ust_session) {
- DBG3("No UST session when tearingdown 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");
- }
-
- trace_ust_destroy_session(session->ust_session);
-}
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static void stop_threads(void)
-{
- int ret;
-
- /* Stopping all threads */
- DBG("Terminating all threads");
- ret = notify_thread_pipe(thread_quit_pipe[1]);
- if (ret < 0) {
- ERR("write error on thread quit pipe");
- }
-
- /* Dispatch thread */
- dispatch_thread_exit = 1;
- futex_nto1_wake(&ust_cmd_queue.futex);
-}
-
-/*
- * Cleanup the daemon
- */
-static void cleanup(void)
-{
- int ret;
- char *cmd;
- struct ltt_session *sess, *stmp;
-
- DBG("Cleaning up");
-
- DBG("Removing %s directory", rundir);
- ret = asprintf(&cmd, "rm -rf %s", rundir);
- if (ret < 0) {
- ERR("asprintf failed. Something is really wrong!");
- }
-
- /* Remove lttng run directory */
- ret = system(cmd);
- if (ret < 0) {
- ERR("Unable to clean %s", rundir);
- }
- free(cmd);
-
- DBG("Cleaning up all session");
-
- /* 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);
- }
- }
-
- 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");
- close(kernel_tracer_fd);
- DBG("Unloading kernel modules");
- modprobe_remove_kernel_modules();
- }
-
- close(thread_quit_pipe[0]);
- close(thread_quit_pipe[1]);
-
- /* <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.
- *
- * Return lttcomm error code.
- */
-static int send_unix_sock(int sock, void *buf, size_t len)
-{
- /* Check valid length */
- if (len <= 0) {
- return -1;
- }
-
- return lttcomm_send_unix_sock(sock, buf, len);
-}
-
-/*
- * 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;
- }
-}
-
-/*
- * Send all stream fds of kernel channel to the consumer.
- */
-static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
- int sock, struct ltt_kernel_channel *channel,
- uid_t uid, gid_t gid)
-{
- 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;
- }
- }
-
- DBG("consumer channel streams sent");
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * 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("Sending metadata stream fd");
-
- /* Extra protection. It's NOT supposed to be set to 0 at this point */
- if (session->consumer_fd == 0) {
- session->consumer_fd = consumer_data->cmd_sock;
- }
-
- 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.stream.stream_key);
- ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
- if (ret < 0) {
- perror("send consumer channel");
- goto error;
- }
-
- /* 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;
- }
- }
-
- 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;
- }
- }
-
- DBG("consumer fds (metadata and channel streams) sent");
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Notify UST applications using the shm mmap futex.
- */
-static int notify_ust_apps(int active)
-{
- char *wait_shm_mmap;
-
- DBG("Notifying applications of session daemon state: %d", active);
-
- /* 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;
- }
-
- /* Wake waiting process */
- futex_wait_update((int32_t *) wait_shm_mmap, active);
-
- /* Apps notified successfully */
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * 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.
- */
-static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
-{
- 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;
-
- cmd_ctx->llm->data_size = size;
- cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
-
- return buf_size;
-
-error:
- return ret;
-}
-
-/*
- * Update the kernel poll set of all channel fd available over all tracing
- * session. Add the wakeup pipe at the end of the set.
- */
-static int update_kernel_poll(struct lttng_poll_event *events)
-{
- int ret;
- struct ltt_session *session;
- struct ltt_kernel_channel *channel;
-
- DBG("Updating kernel poll set");
-
- 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;
- }
-
- cds_list_for_each_entry(channel,
- &session->kernel_session->channel_list.head, list) {
- /* Add channel fd to the kernel poll set */
- ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
- if (ret < 0) {
- session_unlock(session);
- goto error;
- }
- DBG("Channel fd %d added to kernel set", channel->fd);
- }
- session_unlock(session);
- }
- session_unlock_list();
-
- 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 0 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;
-
- /* For all tracing session(s) */
- cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
- if (sess->ust_session) {
- ust_app_global_update(sess->ust_session, app_sock);
- }
- }
-}
-
-/*
- * This thread manage event coming from the kernel.
- *
- * Features supported in this thread:
- * -) CPU Hotplug
- */
-static void *thread_manage_kernel(void *data)
-{
- int ret, i, pollfd, update_poll_flag = 1;
- uint32_t revents, nb_fd;
- char tmp;
- struct lttng_poll_event events;
-
- DBG("Thread manage kernel started");
-
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
- if (ret < 0) {
- goto error;
- }
-
- while (1) {
- if (update_poll_flag == 1) {
- /*
- * Reset number of fd in the poll set. Always 2 since there is the thread
- * quit pipe and the kernel pipe.
- */
- events.nb_fd = 2;
-
- ret = update_kernel_poll(&events);
- if (ret < 0) {
- goto error;
- }
- update_poll_flag = 0;
- }
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- DBG("Thread kernel polling on %d fds", nb_fd);
-
- /* Zeroed the poll events */
- lttng_poll_reset(&events);
-
- /* Poll infinite value of time */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- } else if (ret == 0) {
- /* Should not happen since timeout is infinite */
- ERR("Return value of poll is 0 with an infinite timeout.\n"
- "This should not have happened! Continuing...");
- continue;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Check for data on kernel pipe */
- if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
- ret = read(kernel_poll_pipe[0], &tmp, 1);
- update_poll_flag = 1;
- continue;
- } else {
- /*
- * New CPU detected by the kernel. Adding kernel stream to
- * kernel session and updating the kernel consumer
- */
- if (revents & LPOLLIN) {
- ret = update_kernel_stream(&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:
- DBG("Kernel thread dying");
- close(kernel_poll_pipe[0]);
- close(kernel_poll_pipe[1]);
-
- lttng_poll_clean(&events);
-
- return NULL;
-}
-
-/*
- * This thread manage the consumer error sent back to the session daemon.
- */
-static void *thread_manage_consumer(void *data)
-{
- int sock = 0, 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;
- }
-
- /*
- * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
- * Nothing more will be added to this poll set.
- */
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the registration socket */
- if (pollfd == 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 */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the kconsumerd socket */
- if (pollfd == sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("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:
- DBG("consumer thread dying");
- close(consumer_data->err_sock);
- close(consumer_data->cmd_sock);
- close(sock);
-
- unlink(consumer_data->err_unix_sock_path);
- unlink(consumer_data->cmd_unix_sock_path);
- consumer_data->pid = 0;
-
- lttng_poll_clean(&events);
-
- return NULL;
-}
-
-/*
- * This thread manage application communication.
- */
-static void *thread_manage_apps(void *data)
-{
- int i, ret, pollfd;
- uint32_t revents, nb_fd;
- struct ust_command ust_cmd;
- struct lttng_poll_event events;
-
- DBG("[thread] Manage application started");
-
- rcu_register_thread();
- rcu_thread_online();
-
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- while (1) {
- /* Zeroed the events structure */
- lttng_poll_reset(&events);
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- DBG("Apps thread polling on %d fds", nb_fd);
-
- /* Inifinite blocking call, waiting for transmission */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Inspect the apps cmd pipe */
- if (pollfd == apps_cmd_pipe[0]) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Apps command pipe error");
- goto error;
- } else if (revents & LPOLLIN) {
- /* Empty pipe */
- ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
- if (ret < 0 || ret < sizeof(ust_cmd)) {
- perror("read apps cmd pipe");
- goto error;
- }
-
- /* Register applicaton to the session daemon */
- ret = ust_app_register(&ust_cmd.reg_msg,
- ust_cmd.sock);
- if (ret == -ENOMEM) {
- goto error;
- } else if (ret < 0) {
- break;
- }
-
- /*
- * 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.
- */
- ret = lttng_poll_add(&events, ust_cmd.sock, 0);
- if (ret < 0) {
- goto error;
- }
-
- DBG("Apps with sock %d added to poll set",
- ust_cmd.sock);
- }
-
- break;
- }
- } else {
- /*
- * At this point, we know that a registered application made
- * the event at poll_wait.
- */
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- /* Removing from the poll set */
- ret = lttng_poll_del(&events, pollfd);
- if (ret < 0) {
- goto error;
- }
-
- /* Socket closed on remote end. */
- ust_app_unregister(pollfd);
- break;
- }
- }
- }
- }
-
-error:
- DBG("Application communication apps dying");
- close(apps_cmd_pipe[0]);
- close(apps_cmd_pipe[1]);
-
- lttng_poll_clean(&events);
-
- 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 = 0, i, ret, pollfd;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- /*
- * Get allocated in this thread, enqueued to a global queue, dequeued and
- * freed in the manage apps thread.
- */
- struct ust_command *ust_cmd = NULL;
-
- DBG("[thread] Manage application registration started");
-
- ret = lttcomm_listen_unix_sock(apps_sock);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
- * more will be added to this poll set.
- */
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- /* Notify all applications to register */
- ret = notify_ust_apps(1);
- if (ret < 0) {
- ERR("Failed to notify applications or create the wait shared memory.\n"
- "Execution continues but there might be problem for already\n"
- "running applications that wishes to register.");
- }
-
- while (1) {
- DBG("Accepting application registration");
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the registration socket */
- if (pollfd == apps_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Register apps socket poll error");
- goto error;
- } else if (revents & LPOLLIN) {
- sock = lttcomm_accept_unix_sock(apps_sock);
- if (sock < 0) {
- goto error;
- }
-
- /* Create UST registration command for enqueuing */
- ust_cmd = 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);
- close(sock);
- continue;
- }
-
- ust_cmd->sock = sock;
-
- DBG("UST registration received with pid:%d ppid:%d uid:%d"
- " gid:%d sock:%d name:%s (version %d.%d)",
- ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
- ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
- ust_cmd->sock, ust_cmd->reg_msg.name,
- ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
-
- /*
- * Lock free enqueue the registration request. The red pill
- * has been taken! This apps will be part of the *system*.
- */
- cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
-
- /*
- * Wake the registration queue futex. Implicit memory
- * barrier with the exchange in cds_wfq_enqueue.
- */
- futex_nto1_wake(&ust_cmd_queue.futex);
- }
- }
- }
- }
-
-error:
- DBG("UST Registration thread dying");
-
- /* Notify that the registration thread is gone */
- notify_ust_apps(0);
-
- close(apps_sock);
- close(sock);
- unlink(apps_unix_sock_path);
-
- lttng_poll_clean(&events);
-
- return NULL;
-}
-
-/*
- * Start the thread_manage_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;
-}
-
-/*
- * modprobe_kernel_modules
- */
-static int modprobe_kernel_modules(void)
-{
- int ret = 0, i;
- char modprobe[256];
-
- for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
- ret = snprintf(modprobe, sizeof(modprobe),
- "/sbin/modprobe %s%s",
- kernel_modules_list[i].required ? "" : "-q ",
- kernel_modules_list[i].name);
- if (ret < 0) {
- perror("snprintf modprobe");
- goto error;
- }
- modprobe[sizeof(modprobe) - 1] = '\0';
- ret = system(modprobe);
- if (ret == -1) {
- ERR("Unable to launch modprobe for module %s",
- kernel_modules_list[i].name);
- } else if (kernel_modules_list[i].required
- && WEXITSTATUS(ret) != 0) {
- ERR("Unable to load module %s",
- kernel_modules_list[i].name);
- } else {
- DBG("Modprobe successfully %s",
- kernel_modules_list[i].name);
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * mount_debugfs
- */
-static int mount_debugfs(char *path)
-{
- int ret;
- char *type = "debugfs";
-
- ret = run_as_mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
- if (ret < 0) {
- PERROR("Cannot create debugfs path");
- goto error;
- }
-
- ret = mount(type, path, type, 0, NULL);
- if (ret < 0) {
- PERROR("Cannot mount debugfs");
- goto error;
- }
-
- DBG("Mounted debugfs successfully at %s", path);
-
-error:
- return ret;
-}
-
-/*
- * Setup necessary data for kernel tracer action.
- */
-static void init_kernel_tracer(void)
-{
- int ret;
- char *proc_mounts = "/proc/mounts";
- char line[256];
- char *debugfs_path = NULL, *lttng_path = NULL;
- FILE *fp;
-
- /* Detect debugfs */
- fp = fopen(proc_mounts, "r");
- if (fp == NULL) {
- ERR("Unable to probe %s", proc_mounts);
- goto error;
- }
-
- while (fgets(line, sizeof(line), fp) != NULL) {
- if (strstr(line, "debugfs") != NULL) {
- /* Remove first string */
- strtok(line, " ");
- /* Dup string here so we can reuse line later on */
- debugfs_path = strdup(strtok(NULL, " "));
- DBG("Got debugfs path : %s", debugfs_path);
- break;
- }
- }
-
- fclose(fp);
-
- /* Mount debugfs if needded */
- if (debugfs_path == NULL) {
- ret = asprintf(&debugfs_path, "/mnt/debugfs");
- if (ret < 0) {
- perror("asprintf debugfs path");
- goto error;
- }
- ret = mount_debugfs(debugfs_path);
- if (ret < 0) {
- perror("Cannot mount debugfs");
- goto error;
- }
- }
-
- /* Modprobe lttng kernel modules */
- ret = modprobe_kernel_modules();
- if (ret < 0) {
- goto error;
- }
-
- /* Setup lttng kernel path */
- ret = asprintf(<tng_path, "%s/lttng", debugfs_path);
- if (ret < 0) {
- perror("asprintf lttng path");
- goto error;
- }
-
- /* Open debugfs lttng */
- kernel_tracer_fd = open(lttng_path, O_RDWR);
- if (kernel_tracer_fd < 0) {
- DBG("Failed to open %s", lttng_path);
- goto error;
- }
-
- free(lttng_path);
- free(debugfs_path);
- DBG("Kernel tracer fd %d", kernel_tracer_fd);
- return;
-
-error:
- if (lttng_path) {
- free(lttng_path);
- }
- if (debugfs_path) {
- free(debugfs_path);
- }
- WARN("No kernel tracer available");
- kernel_tracer_fd = 0;
- return;
-}
-
-/*
- * Init tracing by creating trace directory and sending fds kernel consumer.
- */
-static int init_kernel_tracing(struct ltt_kernel_session *session)
-{
- int ret = 0;
-
- if (session->consumer_fds_sent == 0) {
- /*
- * Assign default kernel consumer socket if no consumer assigned to the
- * kernel session. At this point, it's NOT suppose to be 0 but this is
- * an extra security check.
- */
- if (session->consumer_fd == 0) {
- session->consumer_fd = 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) {
- 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;
- case LTTNG_UST_TRACEPOINT_LOGLEVEL:
- tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
- 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;
- }
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- 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;
- }
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- 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;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
- */
-static int cmd_disable_event_all(struct ltt_session *session, int domain,
- char *channel_name)
-{
- int ret;
-
- 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;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- 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;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_EVENT processed by the client thread.
- *
- * TODO: currently, both events and loglevels are kept within the same
- * namespace for UST global registry/app registery, so if an event
- * happen to have the same name as the loglevel (very unlikely though),
- * and an attempt is made to enable/disable both in the same session,
- * the first to be created will be the only one allowed to exist.
- */
-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;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- 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;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- 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_NOT_IMPLEMENTED;
- 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) {
- ret = LTTCOMM_UST_START_FAIL;
- 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;
- }
- }
-
- /* Open kernel metadata stream */
- if (ksession->metadata_stream_fd == 0) {
- ret = kernel_open_metadata_stream(ksession);
- if (ret < 0) {
- ERR("Kernel create metadata stream failed");
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- }
-
- /* For each channel */
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- if (kchan->stream_count == 0) {
- ret = kernel_open_channel_stream(kchan);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- /* Update the stream global counter */
- ksession->stream_count_global += ret;
- }
- }
-
- /* Setup kernel consumer socket and send fds to it */
- ret = init_kernel_tracing(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* This start the kernel tracing */
- ret = kernel_start_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* Quiescent wait after starting trace */
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- /* 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;
- }
- }
-
- 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_UST_STOP_FAIL;
- 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");
- }
-
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- ret = kernel_flush_buffer(kchan);
- if (ret < 0) {
- ERR("Kernel flush buffer error");
- }
- }
-
- ret = kernel_stop_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- if (usess) {
- usess->start_trace = 0;
-
- ret = ust_app_stop_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_STOP_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_CREATE_SESSION processed by the client thread.
- */
-static int cmd_create_session(char *name, char *path, struct ucred *creds)
-{
- int ret;
-
- ret = session_create(name, path, creds->uid, creds->gid);
- 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;
- }
- break;
- }
- default:
- /* TODO: Userspace tracing */
- ret = LTTCOMM_NOT_IMPLEMENTED;
- 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;
- }
-
- sock = lttcomm_connect_unix_sock(sock_path);
- if (sock < 0) {
- ret = LTTCOMM_CONNECT_FAIL;
- goto error;
- }
-
- session->kernel_session->consumer_fd = sock;
- break;
- default:
- /* TODO: Userspace tracing */
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * 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;
- }
- 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);
- }
- DBG3("Number of UST global channels %zd", nb_chan);
- break;
- default:
- *channels = NULL;
- ret = -LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- if (nb_chan > 0) {
- *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
- if (*channels == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- 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);
- }
- 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);
- }
- break;
- }
- default:
- ret = -LTTCOMM_NOT_IMPLEMENTED;
- 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;
-
- DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
-
- if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
- ret = LTTCOMM_KERN_NA;
- 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;
- }
- }
-
- /* Commands that DO NOT need a session. */
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CALIBRATE:
- case LTTNG_CREATE_SESSION:
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_TRACEPOINTS:
- need_tracing_session = 0;
- break;
- default:
- DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
- session_lock_list();
- cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
- session_unlock_list();
- 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;
- } else {
- /* Acquire lock for the session */
- session_lock(cmd_ctx->session);
- }
- break;
- }
-
- /*
- * Check domain type for specific "pre-action".
- */
- switch (cmd_ctx->lsm->domain.type) {
- case LTTNG_DOMAIN_KERNEL:
- if (!is_root) {
- ret = LTTCOMM_KERN_NA;
- goto error;
- }
-
- /* Kernel tracer check */
- if (kernel_tracer_fd == 0) {
- /* Basically, load kernel tracer modules */
- init_kernel_tracer();
- if (kernel_tracer_fd == 0) {
- ret = LTTCOMM_KERN_NA;
- goto error;
- }
- }
-
- /* 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);
- }
- }
- 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);
- }
- }
- break;
- }
- default:
- break;
- }
-
- /*
- * 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,
- cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
- ret = LTTCOMM_EPERM;
- goto error;
- }
- }
-
- /* 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);
- ret = LTTCOMM_OK;
- 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;
- }
-
- /*
- * 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;
- }
-
- /* 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);
- 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;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* 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;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, channels,
- nb_chan * sizeof(struct lttng_channel));
-
- free(channels);
-
- ret = LTTCOMM_OK;
- break;
- }
- case 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;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, events,
- nb_event * sizeof(struct lttng_event));
-
- free(events);
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_LIST_SESSIONS:
- {
- unsigned int nr_sessions;
-
- session_lock_list();
- nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
- if (nr_sessions == 0) {
- ret = LTTCOMM_NO_SESSION;
- session_unlock_list();
- goto error;
- }
- ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
- if (ret < 0) {
- session_unlock_list();
- goto setup_error;
- }
-
- /* Filled the session array */
- list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
- cmd_ctx->creds.uid, cmd_ctx->creds.gid);
-
- 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;
- }
-
-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);
- }
-init_setup_error:
- return ret;
-}
-
-/*
- * This thread manage all clients request using the unix client socket for
- * communication.
- */
-static void *thread_manage_clients(void *data)
-{
- int sock = 0, ret, i, pollfd;
- uint32_t revents, nb_fd;
- struct command_ctx *cmd_ctx = NULL;
- struct lttng_poll_event events;
-
- DBG("[thread] Manage client started");
-
- 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;
- }
-
- /*
- * Notify parent pid that we are ready to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGCHLD);
- }
-
- while (1) {
- DBG("Accepting client command ...");
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the registration socket */
- if (pollfd == client_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Client socket poll error");
- goto error;
- }
- }
- }
-
- DBG("Wait for client response");
-
- sock = lttcomm_accept_unix_sock(client_sock);
- if (sock < 0) {
- goto error;
- }
-
- /* Set socket option for credentials retrieval */
- ret = lttcomm_setsockopt_creds_unix_sock(sock);
- if (ret < 0) {
- goto error;
- }
-
- /* 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;
- }
-
- /* 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;
- }
-
- cmd_ctx->llm = NULL;
- cmd_ctx->session = NULL;
-
- /*
- * 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");
- close(sock);
- free(cmd_ctx);
- continue;
- }
-
- // TODO: Validate cmd_ctx including sanity check for
- // security purpose.
-
- 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);
- 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 */
- close(sock);
-
- clean_command_ctx(&cmd_ctx);
- }
-
-error:
- DBG("Client thread dying");
- unlink(client_unix_sock_path);
- close(client_sock);
- close(sock);
-
- 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 }
- };
-
- 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);
- 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':
- opt_quiet = 1;
- break;
- case 'v':
- /* Verbose level can increase using multiple -v */
- 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;
- break;
- default:
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- return -1;
- }
- }
-
- return 0;
-}
-
-/*
- * Creates the two needed socket by the daemon.
- * apps_sock - The communication socket for all UST apps.
- * client_sock - The communication of the cli tool (lttng).
- */
-static int init_daemon_socket(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;
- }
-
- /* 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;
- }
-
- /* 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;
- 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");
- 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)
-{
- if (access(client_unix_sock_path, F_OK) < 0 &&
- access(apps_unix_sock_path, F_OK) < 0) {
- return 0;
- }
-
- /* Is there anybody out there ? */
- if (lttng_session_daemon_alive()) {
- return -EEXIST;
- } else {
- return 0;
- }
-}
-
-/*
- * Set the tracing group gid onto the client socket.
- *
- * Race window between mkdir and chown is OK because we are going from more
- * permissive (root.root) to les permissive (root.tracing).
- */
-static int set_permissions(char *rundir)
-{
- int ret;
- gid_t gid;
-
- gid = allowed_group();
- if (gid < 0) {
- WARN("No tracing group detected");
- ret = 0;
- goto end;
- }
-
- /* Set lttng run dir */
- ret = chown(rundir, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", rundir);
- perror("chown");
- }
-
- /* lttng client socket path */
- ret = chown(client_unix_sock_path, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", client_unix_sock_path);
- perror("chown");
- }
-
- /* kconsumer error socket path */
- ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
- 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);
- 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);
- 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.
- */
-static int create_kernel_poll_pipe(void)
-{
- return pipe2(kernel_poll_pipe, O_CLOEXEC);
-}
-
-/*
- * Create the application command pipe to wake thread_manage_apps.
- */
-static int create_apps_cmd_pipe(void)
-{
- return pipe2(apps_cmd_pipe, O_CLOEXEC);
-}
-
-/*
- * Create the lttng run directory needed for all global sockets and pipe.
- */
-static int create_lttng_rundir(const char *rundir)
-{
- int ret;
-
- DBG3("Creating LTTng run directory: %s", rundir);
-
- ret = mkdir(rundir, S_IRWXU | S_IRWXG );
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Unable to create %s", rundir);
- goto error;
- } else {
- ret = 0;
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Setup sockets and directory needed by the kconsumerd communication with the
- * session daemon.
- */
-static int set_consumer_sockets(struct consumer_data *consumer_data,
- const char *rundir)
-{
- int ret;
- char path[PATH_MAX];
-
- switch (consumer_data->type) {
- case LTTNG_CONSUMER_KERNEL:
- snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
- break;
- case LTTNG_CONSUMER64_UST:
- snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
- break;
- case LTTNG_CONSUMER32_UST:
- snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
- break;
- default:
- ERR("Consumer type unknown");
- ret = -EINVAL;
- goto error;
- }
-
- DBG2("Creating consumer directory: %s", path);
-
- ret = mkdir(path, S_IRWXU | S_IRWXG);
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Failed to create %s", path);
- goto error;
- }
- ret = 0;
- }
-
- /* Create the kconsumerd error unix socket */
- consumer_data->err_sock =
- lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
- if (consumer_data->err_sock < 0) {
- ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
- ret = -1;
- goto error;
- }
-
- /* File permission MUST be 660 */
- ret = chmod(consumer_data->err_unix_sock_path,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
- PERROR("chmod");
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Signal handler for the daemon
- *
- * Simply stop all worker threads, leaving main() return gracefully after
- * joining all threads and calling cleanup().
- */
-static void sighandler(int sig)
-{
- switch (sig) {
- case SIGPIPE:
- DBG("SIGPIPE catched");
- return;
- case SIGINT:
- DBG("SIGINT catched");
- stop_threads();
- break;
- case SIGTERM:
- DBG("SIGTERM catched");
- stop_threads();
- break;
- default:
- break;
- }
-}
-
-/*
- * Setup signal handler for :
- * SIGINT, SIGTERM, SIGPIPE
- */
-static int set_signal_handler(void)
-{
- int ret = 0;
- struct sigaction sa;
- sigset_t sigset;
-
- if ((ret = sigemptyset(&sigset)) < 0) {
- perror("sigemptyset");
- return ret;
- }
-
- sa.sa_handler = sighandler;
- sa.sa_mask = sigset;
- sa.sa_flags = 0;
- if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- perror("sigaction");
- return ret;
- }
-
- DBG("Signal handler set for SIGTERM, 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.
- */
-static void set_ulimit(void)
-{
- int ret;
- struct rlimit lim;
-
- /* The kernel does not allowed an infinite limit for open files */
- lim.rlim_cur = 65535;
- lim.rlim_max = 65535;
-
- ret = setrlimit(RLIMIT_NOFILE, &lim);
- if (ret < 0) {
- perror("failed to set open files limit");
- }
-}
-
-/*
- * main
- */
-int main(int argc, char **argv)
-{
- int ret = 0;
- void *status;
- const char *home_path;
-
- rcu_register_thread();
-
- /* Create thread quit pipe */
- if ((ret = init_thread_quit_pipe()) < 0) {
- goto error;
- }
-
- setup_consumerd_path();
-
- /* Parse arguments */
- progname = argv[0];
- if ((ret = parse_args(argc, argv) < 0)) {
- goto error;
- }
-
- /* Daemonize */
- if (opt_daemon) {
- ret = daemon(0, 0);
- if (ret < 0) {
- perror("daemon");
- goto error;
- }
- }
-
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
-
- if (is_root) {
- rundir = strdup(LTTNG_RUNDIR);
-
- /* Create global run dir with root access */
- ret = create_lttng_rundir(rundir);
- if (ret < 0) {
- goto error;
- }
-
- if (strlen(apps_unix_sock_path) == 0) {
- snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_UNIX_SOCK);
- }
-
- if (strlen(client_unix_sock_path) == 0) {
- snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
- }
-
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
- }
-
- /* Setup kernel consumerd path */
- snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
- KCONSUMERD_ERR_SOCK_PATH, rundir);
- snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
- KCONSUMERD_CMD_SOCK_PATH, rundir);
-
- 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;
- }
-
- /*
- * Create rundir from home path. This will create something like
- * $HOME/.lttng
- */
- ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
- if (ret < 0) {
- ret = -ENOMEM;
- goto error;
- }
-
- ret = create_lttng_rundir(rundir);
- if (ret < 0) {
- goto error;
- }
-
- if (strlen(apps_unix_sock_path) == 0) {
- snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
- }
-
- /* Set the cli tool unix socket path */
- if (strlen(client_unix_sock_path) == 0) {
- snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
- }
-
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
- }
- }
-
- DBG("Client socket path %s", client_unix_sock_path);
- DBG("Application socket path %s", apps_unix_sock_path);
- DBG("LTTng run directory path: %s", rundir);
-
- /* 32 bits consumerd path setup */
- snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
- USTCONSUMERD32_ERR_SOCK_PATH, rundir);
- snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
- USTCONSUMERD32_CMD_SOCK_PATH, rundir);
-
- 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);
-
- /* 64 bits consumerd path setup */
- snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
- USTCONSUMERD64_ERR_SOCK_PATH, rundir);
- snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
- USTCONSUMERD64_CMD_SOCK_PATH, rundir);
-
- 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);
-
- /*
- * See if daemon already exist.
- */
- 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;
- }
-
- /* After this point, we can safely call cleanup() with "goto exit" */
-
- /*
- * These actions must be executed as root. We do that *after* setting up
- * the sockets path because we MUST make the check for another daemon using
- * those paths *before* trying to set the kernel consumer sockets and init
- * kernel tracer.
- */
- if (is_root) {
- ret = set_consumer_sockets(&kconsumer_data, rundir);
- if (ret < 0) {
- goto exit;
- }
-
- /* Setup kernel tracer */
- if (!opt_no_kernel) {
- init_kernel_tracer();
- }
-
- /* Set ulimit for open files */
- set_ulimit();
- }
-
- 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;
- }
-
- /* 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;
- }
-
- /* Get parent pid if -S, --sig-parent is specified. */
- if (opt_sig_parent) {
- ppid = getppid();
- }
-
- /* Setup the kernel pipe for waking up the kernel thread */
- if ((ret = create_kernel_poll_pipe()) < 0) {
- goto exit;
- }
-
- /* Setup the thread apps communication pipe. */
- if ((ret = create_apps_cmd_pipe()) < 0) {
- goto exit;
- }
-
- /* Init UST command queue. */
- cds_wfq_init(&ust_cmd_queue.queue);
-
- /* Init UST app hash table */
- ust_app_ht_alloc();
-
- /*
- * Get session list pointer. This pointer MUST NOT be free(). This list is
- * statically declared in session.c
- */
- session_list_ptr = session_get_list();
-
- /* Set up max poll set size */
- lttng_poll_set_max_size();
-
- /* Create thread to manage the client socket */
- ret = pthread_create(&client_thread, NULL,
- thread_manage_clients, (void *) NULL);
- if (ret != 0) {
- perror("pthread_create clients");
- goto exit_client;
- }
-
- /* 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;
- }
-
- /* Create thread to manage application registration. */
- ret = pthread_create(®_apps_thread, NULL,
- thread_registration_apps, (void *) NULL);
- if (ret != 0) {
- perror("pthread_create registration");
- goto exit_reg_apps;
- }
-
- /* Create thread to manage application socket */
- ret = pthread_create(&apps_thread, NULL,
- thread_manage_apps, (void *) NULL);
- if (ret != 0) {
- perror("pthread_create apps");
- goto exit_apps;
- }
-
- /* Create kernel thread to manage kernel event */
- ret = pthread_create(&kernel_thread, NULL,
- thread_manage_kernel, (void *) NULL);
- if (ret != 0) {
- perror("pthread_create kernel");
- goto exit_kernel;
- }
-
- ret = pthread_join(kernel_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_kernel:
- ret = pthread_join(apps_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_apps:
- ret = pthread_join(reg_apps_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_reg_apps:
- ret = pthread_join(dispatch_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_dispatch:
- ret = pthread_join(client_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error; /* join error, exit without cleanup */
- }
-
- ret = join_consumer_thread(&kconsumer_data);
- if (ret != 0) {
- perror("join_consumer");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_client:
-exit:
- /*
- * cleanup() is called when no other thread is running.
- */
- rcu_thread_online();
- cleanup();
- rcu_thread_offline();
- rcu_unregister_thread();
- if (!ret) {
- exit(EXIT_SUCCESS);
- }
-error:
- exit(EXIT_FAILURE);
-}
projects / lttng-tools.git / blobdiff