#include <common/utils.h>
#include <common/daemonize.h>
#include <common/config/session-config.h>
+#include <common/dynamic-buffer.h>
+#include <lttng/userspace-probe-internal.h>
+#include <lttng/event-internal.h>
#include "lttng-sessiond.h"
#include "buffer-registry.h"
#include "load-session-thread.h"
#include "notification-thread.h"
#include "notification-thread-commands.h"
-#include "syscall.h"
+#include "rotation-thread.h"
+#include "lttng-syscall.h"
#include "agent.h"
#include "ht-cleanup.h"
-
-#define CONSUMERD_FILE "lttng-consumerd"
+#include "sessiond-config.h"
+#include "sessiond-timer.h"
static const char *help_msg =
#ifdef LTTNG_EMBED_HELP
;
const char *progname;
-const char *tracing_group_name = DEFAULT_TRACING_GROUP;
-static int tracing_group_name_override;
-static char *opt_pidfile;
-static int opt_sig_parent;
-static int opt_verbose_consumer;
-static int opt_daemon, opt_background;
-static int opt_no_kernel;
-static char *opt_load_session_path;
static pid_t ppid; /* Parent PID for --sig-parent option */
static pid_t child_ppid; /* Internal parent PID use with daemonize. */
-static char *rundir;
static int lockfile_fd = -1;
/* Set to 1 when a SIGUSR1 signal is received. */
static int recv_child_signal;
+static struct lttng_kernel_tracer_version kernel_tracer_version;
+static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version;
+
/*
* Consumer daemon specific control data. Every value not initialized here is
* set to 0 by the static definition.
*/
static struct consumer_data kconsumer_data = {
.type = LTTNG_CONSUMER_KERNEL,
- .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
.err_sock = -1,
.cmd_sock = -1,
.channel_monitor_pipe = -1,
+ .channel_rotate_pipe = -1,
.pid_mutex = PTHREAD_MUTEX_INITIALIZER,
.lock = PTHREAD_MUTEX_INITIALIZER,
.cond = PTHREAD_COND_INITIALIZER,
};
static struct consumer_data ustconsumer64_data = {
.type = LTTNG_CONSUMER64_UST,
- .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
.err_sock = -1,
.cmd_sock = -1,
.channel_monitor_pipe = -1,
+ .channel_rotate_pipe = -1,
.pid_mutex = PTHREAD_MUTEX_INITIALIZER,
.lock = PTHREAD_MUTEX_INITIALIZER,
.cond = PTHREAD_COND_INITIALIZER,
};
static struct consumer_data ustconsumer32_data = {
.type = LTTNG_CONSUMER32_UST,
- .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
- .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
.err_sock = -1,
.cmd_sock = -1,
.channel_monitor_pipe = -1,
+ .channel_rotate_pipe = -1,
.pid_mutex = PTHREAD_MUTEX_INITIALIZER,
.lock = PTHREAD_MUTEX_INITIALIZER,
.cond = PTHREAD_COND_INITIALIZER,
{ NULL, 0, 0, 0 }
};
+struct sessiond_config config;
+
/* Command line options to ignore from configuration file */
static const char *config_ignore_options[] = { "help", "version", "config" };
/* Shared between threads */
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];
-/* Global health check unix path */
-static char health_unix_sock_path[PATH_MAX];
-
/* Sockets and FDs */
static int client_sock = -1;
static int apps_sock = -1;
static pthread_t agent_reg_thread;
static pthread_t load_session_thread;
static pthread_t notification_thread;
+static pthread_t rotation_thread;
+static pthread_t timer_thread;
/*
* UST registration command queue. This queue is tied with a futex and uses a N
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 int consumerd32_bin_override;
-static int consumerd64_bin_override;
-static int consumerd32_libdir_override;
-static int consumerd64_libdir_override;
-
static const char *module_proc_lttng = "/proc/lttng";
/*
static enum consumerd_state ust_consumerd_state;
static enum consumerd_state kernel_consumerd_state;
-/*
- * Socket timeout for receiving and sending in seconds.
- */
-static int app_socket_timeout;
-
/* Set in main() with the current page size. */
long page_size;
/* Application health monitoring */
struct health_app *health_sessiond;
-/* Agent TCP port for registration. Used by the agent thread. */
-unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT;
-
/* Am I root or not. */
int is_root; /* Set to 1 if the daemon is running as root */
/* Notification thread handle. */
struct notification_thread_handle *notification_thread_handle;
+/* Rotation thread handle. */
+struct rotation_thread_handle *rotation_thread_handle;
+
/* Global hash tables */
struct lttng_ht *agent_apps_ht_by_sock = NULL;
/*
- * Whether sessiond is ready for commands/notification channel/health check
+ * The initialization of the session daemon is done in multiple phases.
+ *
+ * While all threads are launched near-simultaneously, only some of them
+ * are needed to ensure the session daemon can start to respond to client
* requests.
- * NR_LTTNG_SESSIOND_READY must match the number of calls to
- * sessiond_notify_ready().
+ *
+ * There are two important guarantees that we wish to offer with respect
+ * to the initialisation of the session daemon:
+ * - When the daemonize/background launcher process exits, the sessiond
+ * is fully able to respond to client requests,
+ * - Auto-loaded sessions are visible to clients.
+ *
+ * In order to achieve this, a number of support threads have to be launched
+ * to allow the "client" thread to function properly. Moreover, since the
+ * "load session" thread needs the client thread, we must provide a way
+ * for the "load session" thread to know that the "client" thread is up
+ * and running.
+ *
+ * Hence, the support threads decrement the lttng_sessiond_ready counter
+ * while the "client" threads waits for it to reach 0. Once the "client" thread
+ * unblocks, it posts the message_thread_ready semaphore which allows the
+ * "load session" thread to progress.
+ *
+ * This implies that the "load session" thread is the last to be initialized
+ * and will explicitly call sessiond_signal_parents(), which signals the parents
+ * that the session daemon is fully initialized.
+ *
+ * The four (4) support threads are:
+ * - agent_thread
+ * - notification_thread
+ * - rotation_thread
+ * - health_thread
*/
-#define NR_LTTNG_SESSIOND_READY 4
-int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
+#define NR_LTTNG_SESSIOND_SUPPORT_THREADS 4
+int lttng_sessiond_ready = NR_LTTNG_SESSIOND_SUPPORT_THREADS;
int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
{
/* Notify parents that we are ready for cmd and health check */
LTTNG_HIDDEN
-void sessiond_notify_ready(void)
+void sessiond_signal_parents(void)
{
- if (uatomic_sub_return(<tng_sessiond_ready, 1) == 0) {
- /*
- * Notify parent pid that we are ready to accept command
- * for client side. This ppid is the one from the
- * external process that spawned us.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGUSR1);
- }
-
- /*
- * Notify the parent of the fork() process that we are
- * ready.
- */
- if (opt_daemon || opt_background) {
- kill(child_ppid, SIGUSR1);
- }
+ /*
+ * Notify parent pid that we are ready to accept command
+ * for client side. This ppid is the one from the
+ * external process that spawned us.
+ */
+ if (config.sig_parent) {
+ kill(ppid, SIGUSR1);
}
-}
-
-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.
+ * Notify the parent of the fork() process that we are
+ * ready.
*/
-#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 (config.daemonize || config.background) {
+ kill(child_ppid, SIGUSR1);
}
- if (!consumerd64_libdir[0]) {
- consumerd64_libdir = INSTALL_LIB_PATH;
- }
-#else
-#error "Unknown bitness"
-#endif
+}
+LTTNG_HIDDEN
+void sessiond_notify_ready(void)
+{
/*
- * runtime env. var. overrides the build default.
+ * This memory barrier is paired with the one performed by
+ * the client thread after it has seen that 'lttng_sessiond_ready' is 0.
+ *
+ * The purpose of these memory barriers is to ensure that all
+ * initialization operations of the various threads that call this
+ * function to signal that they are ready are commited/published
+ * before the client thread can see the 'lttng_sessiond_ready' counter
+ * reach 0.
+ *
+ * Note that this could be a 'write' memory barrier, but a full barrier
+ * is used in case the code using this utility changes. The performance
+ * implications of this choice are minimal since this is a slow path.
*/
- bin = lttng_secure_getenv("LTTNG_CONSUMERD32_BIN");
- if (bin) {
- consumerd32_bin = bin;
- }
- bin = lttng_secure_getenv("LTTNG_CONSUMERD64_BIN");
- if (bin) {
- consumerd64_bin = bin;
- }
- libdir = lttng_secure_getenv("LTTNG_CONSUMERD32_LIBDIR");
- if (libdir) {
- consumerd32_libdir = libdir;
- }
- libdir = lttng_secure_getenv("LTTNG_CONSUMERD64_LIBDIR");
- if (libdir) {
- consumerd64_libdir = libdir;
- }
+ cmm_smp_mb();
+ uatomic_sub(<tng_sessiond_ready, 1);
}
static
PERROR("UST consumerd64 channel monitor pipe close");
}
}
-}
-
-/*
- * Generate the full lock file path using the rundir.
- *
- * Return the snprintf() return value thus a negative value is an error.
- */
-static int generate_lock_file_path(char *path, size_t len)
-{
- int ret;
-
- assert(path);
- assert(rundir);
-
- /* Build lockfile path from rundir. */
- ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir);
- if (ret < 0) {
- PERROR("snprintf lockfile path");
+ if (kconsumer_data.channel_rotate_pipe >= 0) {
+ ret = close(kconsumer_data.channel_rotate_pipe);
+ if (ret < 0) {
+ PERROR("kernel consumer channel rotate pipe close");
+ }
+ }
+ if (ustconsumer32_data.channel_rotate_pipe >= 0) {
+ ret = close(ustconsumer32_data.channel_rotate_pipe);
+ if (ret < 0) {
+ PERROR("UST consumerd32 channel rotate pipe close");
+ }
+ }
+ if (ustconsumer64_data.channel_rotate_pipe >= 0) {
+ ret = close(ustconsumer64_data.channel_rotate_pipe);
+ if (ret < 0) {
+ PERROR("UST consumerd64 channel rotate pipe close");
+ }
}
-
- return ret;
}
/*
{
int ret;
struct ltt_session *sess, *stmp;
- char path[PATH_MAX];
DBG("Cleanup sessiond");
*/
utils_close_pipe(thread_quit_pipe);
- /*
- * If opt_pidfile is undefined, the default file will be wiped when
- * removing the rundir.
- */
- if (opt_pidfile) {
- ret = remove(opt_pidfile);
- if (ret < 0) {
- PERROR("remove pidfile %s", opt_pidfile);
- }
+ ret = remove(config.pid_file_path.value);
+ if (ret < 0) {
+ PERROR("remove pidfile %s", config.pid_file_path.value);
}
- DBG("Removing sessiond and consumerd content of directory %s", rundir);
+ DBG("Removing sessiond and consumerd content of directory %s",
+ config.rundir.value);
/* sessiond */
- snprintf(path, PATH_MAX,
- "%s/%s",
- rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
- DBG("Removing %s", path);
- (void) unlink(path);
+ DBG("Removing %s", config.pid_file_path.value);
+ (void) unlink(config.pid_file_path.value);
- snprintf(path, PATH_MAX, "%s/%s", rundir,
- DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE);
- DBG("Removing %s", path);
- (void) unlink(path);
+ DBG("Removing %s", config.agent_port_file_path.value);
+ (void) unlink(config.agent_port_file_path.value);
/* kconsumerd */
- snprintf(path, PATH_MAX,
- DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
- rundir);
- DBG("Removing %s", path);
- (void) unlink(path);
-
- snprintf(path, PATH_MAX,
- DEFAULT_KCONSUMERD_PATH,
- rundir);
- DBG("Removing directory %s", path);
- (void) rmdir(path);
+ DBG("Removing %s", kconsumer_data.err_unix_sock_path);
+ (void) unlink(kconsumer_data.err_unix_sock_path);
+
+ DBG("Removing directory %s", config.kconsumerd_path.value);
+ (void) rmdir(config.kconsumerd_path.value);
/* ust consumerd 32 */
- snprintf(path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
- rundir);
- DBG("Removing %s", path);
- (void) unlink(path);
-
- snprintf(path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_PATH,
- rundir);
- DBG("Removing directory %s", path);
- (void) rmdir(path);
+ DBG("Removing %s", config.consumerd32_err_unix_sock_path.value);
+ (void) unlink(config.consumerd32_err_unix_sock_path.value);
+
+ DBG("Removing directory %s", config.consumerd32_path.value);
+ (void) rmdir(config.consumerd32_path.value);
/* ust consumerd 64 */
- snprintf(path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
- rundir);
- DBG("Removing %s", path);
- (void) unlink(path);
-
- snprintf(path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_PATH,
- rundir);
- DBG("Removing directory %s", path);
- (void) rmdir(path);
+ DBG("Removing %s", config.consumerd64_err_unix_sock_path.value);
+ (void) unlink(config.consumerd64_err_unix_sock_path.value);
+
+ DBG("Removing directory %s", config.consumerd64_path.value);
+ (void) rmdir(config.consumerd64_path.value);
DBG("Cleaning up all sessions");
/* Cleanup ALL session */
cds_list_for_each_entry_safe(sess, stmp,
&session_list_ptr->head, list) {
- cmd_destroy_session(sess, kernel_poll_pipe[1]);
+ cmd_destroy_session(sess, kernel_poll_pipe[1],
+ notification_thread_handle);
}
}
ust_app_clean_list();
buffer_reg_destroy_registries();
- if (is_root && !opt_no_kernel) {
+ if (is_root && !config.no_kernel) {
DBG2("Closing kernel fd");
if (kernel_tracer_fd >= 0) {
ret = close(kernel_tracer_fd);
free(load_info);
}
- /*
- * Cleanup lock file by deleting it and finaly closing it which will
- * release the file system lock.
- */
- if (lockfile_fd >= 0) {
- char lockfile_path[PATH_MAX];
-
- ret = generate_lock_file_path(lockfile_path,
- sizeof(lockfile_path));
- if (ret > 0) {
- ret = remove(lockfile_path);
- if (ret < 0) {
- PERROR("remove lock file");
- }
- ret = close(lockfile_fd);
- if (ret < 0) {
- PERROR("close lock file");
- }
- }
- }
-
/*
* We do NOT rmdir rundir because there are other processes
* using it, for instance lttng-relayd, which can start in
* parallel with this teardown.
*/
-
- free(rundir);
}
/*
{
DBG("Cleaning up options");
- /*
- * If the override option is set, the pointer points to a *non* const
- * thus freeing it even though the variable type is set to const.
- */
- if (tracing_group_name_override) {
- free((void *) tracing_group_name);
- }
- if (consumerd32_bin_override) {
- free((void *) consumerd32_bin);
- }
- if (consumerd64_bin_override) {
- free((void *) consumerd64_bin);
- }
- if (consumerd32_libdir_override) {
- free((void *) consumerd32_libdir);
- }
- if (consumerd64_libdir_override) {
- free((void *) consumerd64_libdir);
- }
-
- free(opt_pidfile);
- free(opt_load_session_path);
- free(kmod_probes_list);
- free(kmod_extra_probes_list);
+ sessiond_config_fini(&config);
run_as_destroy_worker();
}
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);
+ wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root);
if (wait_shm_mmap == NULL) {
goto error;
}
*
* Useful for CPU hotplug feature.
*/
-static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
+static int update_kernel_stream(int fd)
{
int ret = 0;
struct ltt_session *session;
cds_lfht_for_each_entry(ksess->consumer->socks->ht,
&iter.iter, socket, node.node) {
pthread_mutex_lock(socket->lock);
- ret = kernel_consumer_send_channel_stream(socket,
+ ret = kernel_consumer_send_channel_streams(socket,
channel, ksess,
session->output_traces ? 1 : 0);
pthread_mutex_unlock(socket->lock);
* New CPU detected by the kernel. Adding kernel stream to
* kernel session and updating the kernel consumer
*/
- ret = update_kernel_stream(&kconsumer_data, pollfd);
+ ret = update_kernel_stream(pollfd);
if (ret < 0) {
continue;
}
health_code_update();
/*
- * Transfer the write-end of the channel monitoring pipe to the
- * by issuing a SET_CHANNEL_MONITOR_PIPE command.
+ * Transfer the write-end of the channel monitoring and rotate pipe
+ * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE and
+ * SET_CHANNEL_ROTATE_PIPE commands.
*/
cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock);
if (!cmd_socket_wrapper) {
goto error;
}
+ cmd_socket_wrapper->lock = &consumer_data->lock;
ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper,
consumer_data->channel_monitor_pipe);
if (ret) {
goto error;
}
+
+ ret = consumer_send_channel_rotate_pipe(cmd_socket_wrapper,
+ consumer_data->channel_rotate_pipe);
+ if (ret) {
+ goto error;
+ }
+
/* Discard the socket wrapper as it is no longer needed. */
consumer_destroy_socket(cmd_socket_wrapper);
cmd_socket_wrapper = NULL;
}
/*
- * This thread manage application communication.
+ * This thread receives application command sockets (FDs) on the
+ * apps_cmd_pipe and waits (polls) on them until they are closed
+ * or an error occurs.
+ *
+ * At that point, it flushes the data (tracing and metadata) associated
+ * with this application and tears down ust app sessions and other
+ * associated data structures through ust_app_unregister().
+ *
+ * Note that this thread never sends commands to the applications
+ * through the command sockets; it merely listens for hang-ups
+ * and errors on those sockets and cleans-up as they occur.
*/
static void *thread_manage_apps(void *data)
{
* lttcomm_setsockopt_snd_timeout expect msec as
* parameter.
*/
- if (app_socket_timeout >= 0) {
+ if (config.app_socket_timeout >= 0) {
(void) lttcomm_setsockopt_rcv_timeout(sock,
- app_socket_timeout * 1000);
+ config.app_socket_timeout * 1000);
(void) lttcomm_setsockopt_snd_timeout(sock,
- app_socket_timeout * 1000);
+ config.app_socket_timeout * 1000);
}
/*
}
lttng_fd_put(LTTNG_FD_APPS, 1);
}
- unlink(apps_unix_sock_path);
+ unlink(config.apps_unix_sock_path.value);
error_poll_add:
lttng_poll_clean(&events);
/*
* Exec consumerd.
*/
- if (opt_verbose_consumer) {
+ if (config.verbose_consumer) {
verbosity = "--verbose";
} else if (lttng_opt_quiet) {
verbosity = "--quiet";
* 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(" 1) %s", config.consumerd64_bin_path.value ? : "NULL");
+ DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE);
+ DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL");
+ if (stat(config.consumerd64_bin_path.value, &st) == 0) {
DBG3("Found location #1");
- consumer_to_use = consumerd64_bin;
- } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
+ consumer_to_use = config.consumerd64_bin_path.value;
+ } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
DBG3("Found location #2");
- consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
- } else if (stat(consumerd32_bin, &st) == 0) {
+ consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
+ } else if (config.consumerd32_bin_path.value &&
+ stat(config.consumerd32_bin_path.value, &st) == 0) {
DBG3("Found location #3");
- consumer_to_use = consumerd32_bin;
+ consumer_to_use = config.consumerd32_bin_path.value;
} else {
DBG("Could not find any valid consumerd executable");
ret = -EINVAL;
- break;
+ goto error;
}
DBG("Using kernel consumer at: %s", consumer_to_use);
- ret = execl(consumer_to_use,
+ (void) 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,
- "--group", tracing_group_name,
+ "--group", config.tracing_group_name.value,
NULL);
break;
case LTTNG_CONSUMER64_UST:
{
- char *tmpnew = NULL;
-
- if (consumerd64_libdir[0] != '\0') {
+ if (config.consumerd64_lib_dir.value) {
char *tmp;
size_t tmplen;
+ char *tmpnew;
tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
if (!tmp) {
tmp = "";
}
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
+ tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
tmpnew = zmalloc(tmplen + 1 /* \0 */);
if (!tmpnew) {
ret = -ENOMEM;
goto error;
}
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd64_libdir);
+ strcat(tmpnew, config.consumerd64_lib_dir.value);
if (tmp[0] != '\0') {
strcat(tmpnew, ":");
strcat(tmpnew, tmp);
}
- ret = putenv(tmpnew);
+ ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
+ free(tmpnew);
if (ret) {
ret = -errno;
- free(tmpnew);
goto error;
}
}
- DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
- ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
+ DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value);
+ (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u",
"--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
"--consumerd-err-sock", consumer_data->err_unix_sock_path,
- "--group", tracing_group_name,
+ "--group", config.tracing_group_name.value,
NULL);
- if (consumerd64_libdir[0] != '\0') {
- free(tmpnew);
- }
break;
}
case LTTNG_CONSUMER32_UST:
{
- char *tmpnew = NULL;
-
- if (consumerd32_libdir[0] != '\0') {
+ if (config.consumerd32_lib_dir.value) {
char *tmp;
size_t tmplen;
+ char *tmpnew;
tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
if (!tmp) {
tmp = "";
}
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
+ tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
tmpnew = zmalloc(tmplen + 1 /* \0 */);
if (!tmpnew) {
ret = -ENOMEM;
goto error;
}
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd32_libdir);
+ strcat(tmpnew, config.consumerd32_lib_dir.value);
if (tmp[0] != '\0') {
strcat(tmpnew, ":");
strcat(tmpnew, tmp);
}
- ret = putenv(tmpnew);
+ ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
+ free(tmpnew);
if (ret) {
ret = -errno;
- free(tmpnew);
goto error;
}
}
- DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
- ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
+ DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value);
+ (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u",
"--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
"--consumerd-err-sock", consumer_data->err_unix_sock_path,
- "--group", tracing_group_name,
+ "--group", config.tracing_group_name.value,
NULL);
- if (consumerd32_libdir[0] != '\0') {
- free(tmpnew);
- }
break;
}
default:
- PERROR("unknown consumer type");
- exit(EXIT_FAILURE);
+ ERR("unknown consumer type");
+ errno = 0;
}
if (errno != 0) {
PERROR("Consumer execl()");
kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
if (kernel_tracer_fd < 0) {
DBG("Failed to open %s", module_proc_lttng);
- ret = -1;
goto error_open;
}
/* Validate kernel version */
- ret = kernel_validate_version(kernel_tracer_fd);
+ ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version,
+ &kernel_tracer_abi_version);
if (ret < 0) {
goto error_version;
}
goto error;
}
- /* Create directory(ies) on local filesystem. */
- if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
- strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
- ret = run_as_mkdir_recursive(
- session->kernel_session->consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Trace directory creation error");
- goto error;
- }
- }
- }
-
session->kernel_session->uid = session->uid;
session->kernel_session->gid = session->gid;
session->kernel_session->output_traces = session->output_traces;
return i;
}
+static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock,
+ int *sock_error, struct lttng_event *event)
+{
+ int fd, ret;
+ struct lttng_userspace_probe_location *probe_location;
+ const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
+ struct lttng_dynamic_buffer probe_location_buffer;
+ struct lttng_buffer_view buffer_view;
+
+ /*
+ * Create a buffer to store the serialized version of the probe
+ * location.
+ */
+ lttng_dynamic_buffer_init(&probe_location_buffer);
+ ret = lttng_dynamic_buffer_set_size(&probe_location_buffer,
+ cmd_ctx->lsm->u.enable.userspace_probe_location_len);
+ if (ret) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ /*
+ * Receive the probe location.
+ */
+ ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data,
+ probe_location_buffer.size);
+ if (ret <= 0) {
+ DBG("Nothing recv() from client var len data... continuing");
+ *sock_error = 1;
+ lttng_dynamic_buffer_reset(&probe_location_buffer);
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ buffer_view = lttng_buffer_view_from_dynamic_buffer(
+ &probe_location_buffer, 0, probe_location_buffer.size);
+
+ /*
+ * Extract the probe location from the serialized version.
+ */
+ ret = lttng_userspace_probe_location_create_from_buffer(
+ &buffer_view, &probe_location);
+ if (ret < 0) {
+ WARN("Failed to create a userspace probe location from the received buffer");
+ lttng_dynamic_buffer_reset( &probe_location_buffer);
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ /*
+ * Receive the file descriptor to the target binary from the client.
+ */
+ DBG("Receiving userspace probe target FD from client ...");
+ ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
+ if (ret <= 0) {
+ DBG("Nothing recv() from client userspace probe fd... continuing");
+ *sock_error = 1;
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ /*
+ * Set the file descriptor received from the client through the unix
+ * socket in the probe location.
+ */
+ lookup = lttng_userspace_probe_location_get_lookup_method(probe_location);
+ if (!lookup) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ /*
+ * From the kernel tracer's perspective, all userspace probe event types
+ * are all the same: a file and an offset.
+ */
+ switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ ret = lttng_userspace_probe_location_function_set_binary_fd(
+ probe_location, fd);
+ break;
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
+ ret = lttng_userspace_probe_location_tracepoint_set_binary_fd(
+ probe_location, fd);
+ break;
+ default:
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ if (ret) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ /* Attach the probe location to the event. */
+ ret = lttng_event_set_userspace_probe_location(event, probe_location);
+ if (ret) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ lttng_dynamic_buffer_reset(&probe_location_buffer);
+error:
+ return ret;
+}
+
+/*
+ * Check if the current kernel tracer supports the session rotation feature.
+ * Return 1 if it does, 0 otherwise.
+ */
+static int check_rotate_compatible(void)
+{
+ int ret = 1;
+
+ if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) {
+ DBG("Kernel tracer version is not compatible with the rotation feature");
+ ret = 0;
+ }
+
+ return ret;
+}
+
/*
* Process the command requested by the lttng client within the command
* context structure. This function make sure that the return structure (llm)
case LTTNG_REGENERATE_STATEDUMP:
case LTTNG_REGISTER_TRIGGER:
case LTTNG_UNREGISTER_TRIGGER:
+ case LTTNG_ROTATE_SESSION:
+ case LTTNG_ROTATION_GET_INFO:
+ case LTTNG_ROTATION_SET_SCHEDULE:
+ case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
need_domain = 0;
break;
default:
need_domain = 1;
}
- if (opt_no_kernel && need_domain
+ if (config.no_kernel && need_domain
&& cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
if (!is_root) {
ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
case LTTNG_LIST_SYSCALLS:
case LTTNG_LIST_TRACKER_PIDS:
case LTTNG_DATA_PENDING:
+ case LTTNG_ROTATE_SESSION:
+ case LTTNG_ROTATION_GET_INFO:
+ case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
break;
default:
/* Setup lttng message with no payload */
/* Start the UST consumer daemons */
/* 64-bit */
pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
- if (consumerd64_bin[0] != '\0' &&
+ if (config.consumerd64_bin_path.value &&
ustconsumer64_data.pid == 0 &&
cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
/* 32-bit */
pthread_mutex_lock(&ustconsumer32_data.pid_mutex);
- if (consumerd32_bin[0] != '\0' &&
+ if (config.consumerd32_bin_path.value &&
ustconsumer32_data.pid == 0 &&
cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
}
case LTTNG_ENABLE_EVENT:
{
+ struct lttng_event *ev = NULL;
struct lttng_event_exclusion *exclusion = NULL;
struct lttng_filter_bytecode *bytecode = NULL;
char *filter_expression = NULL;
ret = lttcomm_recv_unix_sock(sock, filter_expression,
expression_len);
if (ret <= 0) {
- DBG("Nothing recv() from client car len data... continuing");
+ DBG("Nothing recv() from client var len data... continuing");
*sock_error = 1;
free(filter_expression);
free(exclusion);
DBG("Receiving var len filter's bytecode from client ...");
ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
if (ret <= 0) {
- DBG("Nothing recv() from client car len data... continuing");
+ DBG("Nothing recv() from client var len data... continuing");
*sock_error = 1;
free(filter_expression);
free(bytecode);
}
}
+ ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event);
+ if (!ev) {
+ DBG("Failed to copy event: %s",
+ cmd_ctx->lsm->u.enable.event.name);
+ free(filter_expression);
+ free(bytecode);
+ free(exclusion);
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+
+ if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) {
+ /* Expect a userspace probe description. */
+ ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev);
+ if (ret) {
+ free(filter_expression);
+ free(bytecode);
+ free(exclusion);
+ lttng_event_destroy(ev);
+ goto error;
+ }
+ }
+
ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
cmd_ctx->lsm->u.enable.channel_name,
- &cmd_ctx->lsm->u.enable.event,
+ ev,
filter_expression, bytecode, exclusion,
kernel_poll_pipe[1]);
+ lttng_event_destroy(ev);
break;
}
case LTTNG_LIST_TRACEPOINTS:
}
case LTTNG_START_TRACE:
{
+ /*
+ * On the first start, if we have a kernel session and we have
+ * enabled time or size-based rotations, we have to make sure
+ * the kernel tracer supports it.
+ */
+ if (!cmd_ctx->session->has_been_started && \
+ cmd_ctx->session->kernel_session && \
+ (cmd_ctx->session->rotate_timer_period || \
+ cmd_ctx->session->rotate_size) && \
+ !check_rotate_compatible()) {
+ DBG("Kernel tracer version is not compatible with the rotation feature");
+ ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+ goto error;
+ }
ret = cmd_start_trace(cmd_ctx->session);
break;
}
}
case LTTNG_DESTROY_SESSION:
{
- ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
+ ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1],
+ notification_thread_handle);
/* Set session to NULL so we do not unlock it after free. */
cmd_ctx->session = NULL;
notification_thread_handle);
break;
}
+ case LTTNG_ROTATE_SESSION:
+ {
+ struct lttng_rotate_session_return rotate_return;
+
+ DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
+
+ memset(&rotate_return, 0, sizeof(rotate_return));
+ if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
+ DBG("Kernel tracer version is not compatible with the rotation feature");
+ ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+ goto error;
+ }
+
+ ret = cmd_rotate_session(cmd_ctx->session, &rotate_return);
+ if (ret < 0) {
+ ret = -ret;
+ goto error;
+ }
+
+ ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
+ sizeof(rotate_return));
+ if (ret < 0) {
+ ret = -ret;
+ goto error;
+ }
+
+ ret = LTTNG_OK;
+ break;
+ }
+ case LTTNG_ROTATION_GET_INFO:
+ {
+ struct lttng_rotation_get_info_return get_info_return;
+
+ memset(&get_info_return, 0, sizeof(get_info_return));
+ ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
+ cmd_ctx->lsm->u.get_rotation_info.rotation_id);
+ if (ret < 0) {
+ ret = -ret;
+ goto error;
+ }
+
+ ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
+ sizeof(get_info_return));
+ if (ret < 0) {
+ ret = -ret;
+ goto error;
+ }
+
+ ret = LTTNG_OK;
+ break;
+ }
+ case LTTNG_ROTATION_SET_SCHEDULE:
+ {
+ bool set_schedule;
+ enum lttng_rotation_schedule_type schedule_type;
+ uint64_t value;
+
+ if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
+ DBG("Kernel tracer version does not support session rotations");
+ ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+ goto error;
+ }
+
+ set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1;
+ schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type;
+ value = cmd_ctx->lsm->u.rotation_set_schedule.value;
+
+ ret = cmd_rotation_set_schedule(cmd_ctx->session,
+ set_schedule,
+ schedule_type,
+ value,
+ notification_thread_handle);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+
+ break;
+ }
+ case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
+ {
+ struct lttng_session_list_schedules_return schedules = {
+ .periodic.set = !!cmd_ctx->session->rotate_timer_period,
+ .periodic.value = cmd_ctx->session->rotate_timer_period,
+ .size.set = !!cmd_ctx->session->rotate_size,
+ .size.value = cmd_ctx->session->rotate_size,
+ };
+
+ ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
+ sizeof(schedules));
+ if (ret < 0) {
+ ret = -ret;
+ goto error;
+ }
+
+ ret = LTTNG_OK;
+ break;
+ }
default:
ret = LTTNG_ERR_UND;
break;
lttng_poll_init(&events);
/* Create unix socket */
- sock = lttcomm_create_unix_sock(health_unix_sock_path);
+ sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value);
if (sock < 0) {
ERR("Unable to create health check Unix socket");
goto error;
if (is_root) {
/* lttng health client socket path permissions */
- ret = chown(health_unix_sock_path, 0,
- utils_get_group_id(tracing_group_name));
+ ret = chown(config.health_unix_sock_path.value, 0,
+ utils_get_group_id(config.tracing_group_name.value));
if (ret < 0) {
- ERR("Unable to set group on %s", health_unix_sock_path);
+ ERR("Unable to set group on %s", config.health_unix_sock_path.value);
PERROR("chown");
goto error;
}
- ret = chmod(health_unix_sock_path,
+ ret = chmod(config.health_unix_sock_path.value,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (ret < 0) {
- ERR("Unable to set permissions on %s", health_unix_sock_path);
+ ERR("Unable to set permissions on %s", config.health_unix_sock_path.value);
PERROR("chmod");
goto error;
}
ERR("Health error occurred in %s", __func__);
}
DBG("Health check thread dying");
- unlink(health_unix_sock_path);
+ unlink(config.health_unix_sock_path.value);
if (sock >= 0) {
ret = close(sock);
if (ret) {
goto error;
}
- sessiond_notify_ready();
ret = sem_post(&load_info->message_thread_ready);
if (ret) {
PERROR("sem_post message_thread_ready");
goto error;
}
- /* This testpoint is after we signal readiness to the parent. */
+ /*
+ * Wait until all support threads are initialized before accepting
+ * commands.
+ */
+ while (uatomic_read(<tng_sessiond_ready) != 0) {
+ fd_set read_fds;
+ struct timeval timeout;
+
+ FD_ZERO(&read_fds);
+ FD_SET(thread_quit_pipe[0], &read_fds);
+ memset(&timeout, 0, sizeof(timeout));
+ timeout.tv_usec = 1000;
+
+ /*
+ * If a support thread failed to launch, it may signal that
+ * we must exit and the sessiond would never be marked as
+ * "ready".
+ *
+ * The timeout is set to 1ms, which serves as a way to
+ * pace down this check.
+ */
+ ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL,
+ &timeout);
+ if (ret > 0 || (ret < 0 && errno != EINTR)) {
+ goto exit;
+ }
+ }
+ /*
+ * This barrier is paired with the one in sessiond_notify_ready() to
+ * ensure that loads accessing data initialized by the other threads,
+ * on which this thread was waiting, are not performed before this point.
+ *
+ * Note that this could be a 'read' memory barrier, but a full barrier
+ * is used in case the code changes. The performance implications of
+ * this choice are minimal since this is a slow path.
+ */
+ cmm_smp_mb();
+
+ /* This testpoint is after we signal readiness to the parent. */
if (testpoint(sessiond_thread_manage_clients)) {
goto error;
}
health_code_update();
while (1) {
+ const struct cmd_completion_handler *cmd_completion_handler;
+
DBG("Accepting client command ...");
/* Inifinite blocking call, waiting for transmission */
continue;
}
+ cmd_completion_handler = cmd_pop_completion_handler();
+ if (cmd_completion_handler) {
+ enum lttng_error_code completion_code;
+
+ completion_code = cmd_completion_handler->run(
+ cmd_completion_handler->data);
+ if (completion_code != LTTNG_OK) {
+ clean_command_ctx(&cmd_ctx);
+ continue;
+ }
+ }
+
health_code_update();
DBG("Sending response (size: %d, retcode: %s (%d))",
error_listen:
error_create_poll:
- unlink(client_unix_sock_path);
+ unlink(config.client_unix_sock_path.value);
if (client_sock >= 0) {
ret = close(client_sock);
if (ret) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-c, --client-sock");
} else {
- snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.client_unix_sock_path,
+ strdup(arg));
+ if (!config.client_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "apps-sock") || opt == 'a') {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-a, --apps-sock");
} else {
- snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.apps_unix_sock_path,
+ strdup(arg));
+ if (!config.apps_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "daemonize") || opt == 'd') {
- opt_daemon = 1;
+ config.daemonize = true;
} else if (string_match(optname, "background") || opt == 'b') {
- opt_background = 1;
+ config.background = true;
} else if (string_match(optname, "group") || opt == 'g') {
if (!arg || *arg == '\0') {
ret = -EINVAL;
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-g, --group");
} else {
- /*
- * If the override option is set, the pointer points to a
- * *non* const thus freeing it even though the variable type is
- * set to const.
- */
- if (tracing_group_name_override) {
- free((void *) tracing_group_name);
- }
- tracing_group_name = strdup(arg);
- if (!tracing_group_name) {
- PERROR("strdup");
+ config_string_set(&config.tracing_group_name,
+ strdup(arg));
+ if (!config.tracing_group_name.value) {
ret = -ENOMEM;
+ PERROR("strdup");
}
- tracing_group_name_override = 1;
}
} else if (string_match(optname, "help") || opt == 'h') {
ret = utils_show_help(8, "lttng-sessiond", help_msg);
fprintf(stdout, "%s\n", VERSION);
exit(EXIT_SUCCESS);
} else if (string_match(optname, "sig-parent") || opt == 'S') {
- opt_sig_parent = 1;
+ config.sig_parent = true;
} else if (string_match(optname, "kconsumerd-err-sock")) {
if (!arg || *arg == '\0') {
ret = -EINVAL;
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kconsumerd-err-sock");
} else {
- snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.kconsumerd_err_unix_sock_path,
+ strdup(arg));
+ if (!config.kconsumerd_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "kconsumerd-cmd-sock")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kconsumerd-cmd-sock");
} else {
- snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.kconsumerd_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.kconsumerd_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "ustconsumerd64-err-sock")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd64-err-sock");
} else {
- snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.consumerd64_err_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd64_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd64-cmd-sock");
} else {
- snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.consumerd64_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd64_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "ustconsumerd32-err-sock")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd32-err-sock");
} else {
- snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.consumerd32_err_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd32_err_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd32-cmd-sock");
} else {
- snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
+ config_string_set(&config.consumerd32_cmd_unix_sock_path,
+ strdup(arg));
+ if (!config.consumerd32_cmd_unix_sock_path.value) {
+ ret = -ENOMEM;
+ PERROR("strdup");
+ }
}
} else if (string_match(optname, "no-kernel")) {
- opt_no_kernel = 1;
+ config.no_kernel = true;
} else if (string_match(optname, "quiet") || opt == 'q') {
- lttng_opt_quiet = 1;
+ config.quiet = true;
} else if (string_match(optname, "verbose") || opt == 'v') {
/* Verbose level can increase using multiple -v */
if (arg) {
/* Value obtained from config file */
- lttng_opt_verbose = config_parse_value(arg);
+ config.verbose = config_parse_value(arg);
} else {
/* -v used on command line */
- lttng_opt_verbose++;
+ config.verbose++;
}
/* Clamp value to [0, 3] */
- lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 :
- (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3);
+ config.verbose = config.verbose < 0 ? 0 :
+ (config.verbose <= 3 ? config.verbose : 3);
} else if (string_match(optname, "verbose-consumer")) {
if (arg) {
- opt_verbose_consumer = config_parse_value(arg);
+ config.verbose_consumer = config_parse_value(arg);
} else {
- opt_verbose_consumer++;
+ config.verbose_consumer++;
}
} else if (string_match(optname, "consumerd32-path")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd32-path");
} else {
- if (consumerd32_bin_override) {
- free((void *) consumerd32_bin);
- }
- consumerd32_bin = strdup(arg);
- if (!consumerd32_bin) {
+ config_string_set(&config.consumerd32_bin_path,
+ strdup(arg));
+ if (!config.consumerd32_bin_path.value) {
PERROR("strdup");
ret = -ENOMEM;
}
- consumerd32_bin_override = 1;
}
} else if (string_match(optname, "consumerd32-libdir")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd32-libdir");
} else {
- if (consumerd32_libdir_override) {
- free((void *) consumerd32_libdir);
- }
- consumerd32_libdir = strdup(arg);
- if (!consumerd32_libdir) {
+ config_string_set(&config.consumerd32_lib_dir,
+ strdup(arg));
+ if (!config.consumerd32_lib_dir.value) {
PERROR("strdup");
ret = -ENOMEM;
}
- consumerd32_libdir_override = 1;
}
} else if (string_match(optname, "consumerd64-path")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd64-path");
} else {
- if (consumerd64_bin_override) {
- free((void *) consumerd64_bin);
- }
- consumerd64_bin = strdup(arg);
- if (!consumerd64_bin) {
+ config_string_set(&config.consumerd64_bin_path,
+ strdup(arg));
+ if (!config.consumerd64_bin_path.value) {
PERROR("strdup");
ret = -ENOMEM;
}
- consumerd64_bin_override = 1;
}
} else if (string_match(optname, "consumerd64-libdir")) {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd64-libdir");
} else {
- if (consumerd64_libdir_override) {
- free((void *) consumerd64_libdir);
- }
- consumerd64_libdir = strdup(arg);
- if (!consumerd64_libdir) {
+ config_string_set(&config.consumerd64_lib_dir,
+ strdup(arg));
+ if (!config.consumerd64_lib_dir.value) {
PERROR("strdup");
ret = -ENOMEM;
}
- consumerd64_libdir_override = 1;
}
} else if (string_match(optname, "pidfile") || opt == 'p') {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-p, --pidfile");
} else {
- free(opt_pidfile);
- opt_pidfile = strdup(arg);
- if (!opt_pidfile) {
+ config_string_set(&config.pid_file_path, strdup(arg));
+ if (!config.pid_file_path.value) {
PERROR("strdup");
ret = -ENOMEM;
}
ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
return -1;
}
- agent_tcp_port = (uint32_t) v;
- DBG3("Agent TCP port set to non default: %u", agent_tcp_port);
+ config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v;
+ DBG3("Agent TCP port set to non default: %i", (int) v);
}
} else if (string_match(optname, "load") || opt == 'l') {
if (!arg || *arg == '\0') {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-l, --load");
} else {
- free(opt_load_session_path);
- opt_load_session_path = strdup(arg);
- if (!opt_load_session_path) {
+ config_string_set(&config.load_session_path, strdup(arg));
+ if (!config.load_session_path.value) {
PERROR("strdup");
ret = -ENOMEM;
}
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kmod-probes");
} else {
- free(kmod_probes_list);
- kmod_probes_list = strdup(arg);
- if (!kmod_probes_list) {
+ config_string_set(&config.kmod_probes_list, strdup(arg));
+ if (!config.kmod_probes_list.value) {
PERROR("strdup");
ret = -ENOMEM;
}
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--extra-kmod-probes");
} else {
- free(kmod_extra_probes_list);
- kmod_extra_probes_list = strdup(arg);
- if (!kmod_extra_probes_list) {
+ config_string_set(&config.kmod_extra_probes_list,
+ strdup(arg));
+ if (!config.kmod_extra_probes_list.value) {
PERROR("strdup");
ret = -ENOMEM;
}
old_umask = umask(0);
/* Create client tool unix socket */
- client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
+ client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value);
if (client_sock < 0) {
- ERR("Create unix sock failed: %s", client_unix_sock_path);
+ ERR("Create unix sock failed: %s", config.client_unix_sock_path.value);
ret = -1;
goto end;
}
}
/* File permission MUST be 660 */
- ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (ret < 0) {
- ERR("Set file permissions failed: %s", client_unix_sock_path);
+ ERR("Set file permissions failed: %s", config.client_unix_sock_path.value);
PERROR("chmod");
goto end;
}
/* Create the application unix socket */
- apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
+ apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value);
if (apps_sock < 0) {
- ERR("Create unix sock failed: %s", apps_unix_sock_path);
+ ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value);
ret = -1;
goto end;
}
}
/* File permission MUST be 666 */
- ret = chmod(apps_unix_sock_path,
+ ret = chmod(config.apps_unix_sock_path.value,
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);
+ ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value);
PERROR("chmod");
goto end;
}
return ret;
}
+/*
+ * Create lockfile using the rundir and return its fd.
+ */
+static int create_lockfile(void)
+{
+ return utils_create_lock_file(config.lock_file_path.value);
+}
+
/*
* Check if the global socket is available, and if a daemon is answering at the
* other side. If yes, error is returned.
+ *
+ * Also attempts to create and hold the lock file.
*/
static int check_existing_daemon(void)
{
+ int ret = 0;
+
/* Is there anybody out there ? */
if (lttng_session_daemon_alive()) {
- return -EEXIST;
+ ret = -EEXIST;
+ goto end;
}
- return 0;
+ lockfile_fd = create_lockfile();
+ if (lockfile_fd < 0) {
+ ret = -EEXIST;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static void sessiond_cleanup_lock_file(void)
+{
+ int ret;
+
+ /*
+ * Cleanup lock file by deleting it and finaly closing it which will
+ * release the file system lock.
+ */
+ if (lockfile_fd >= 0) {
+ ret = remove(config.lock_file_path.value);
+ if (ret < 0) {
+ PERROR("remove lock file");
+ }
+ ret = close(lockfile_fd);
+ if (ret < 0) {
+ PERROR("close lock file");
+ }
+ }
}
/*
int ret;
gid_t gid;
- gid = utils_get_group_id(tracing_group_name);
+ gid = utils_get_group_id(config.tracing_group_name.value);
/* Set lttng run dir */
ret = chown(rundir, 0, gid);
}
/* lttng client socket path */
- ret = chown(client_unix_sock_path, 0, gid);
+ ret = chown(config.client_unix_sock_path.value, 0, gid);
if (ret < 0) {
- ERR("Unable to set group on %s", client_unix_sock_path);
+ ERR("Unable to set group on %s", config.client_unix_sock_path.value);
PERROR("chown");
}
/*
* Create the lttng run directory needed for all global sockets and pipe.
*/
-static int create_lttng_rundir(const char *rundir)
+static int create_lttng_rundir(void)
{
int ret;
- DBG3("Creating LTTng run directory: %s", rundir);
+ DBG3("Creating LTTng run directory: %s", config.rundir.value);
- ret = mkdir(rundir, S_IRWXU);
+ ret = mkdir(config.rundir.value, S_IRWXU);
if (ret < 0) {
if (errno != EEXIST) {
- ERR("Unable to create %s", rundir);
+ ERR("Unable to create %s", config.rundir.value);
goto error;
} else {
ret = 0;
}
/*
- * Setup sockets and directory needed by the kconsumerd communication with the
+ * Setup sockets and directory needed by the consumerds' communication with the
* session daemon.
*/
-static int set_consumer_sockets(struct consumer_data *consumer_data,
- const char *rundir)
+static int set_consumer_sockets(struct consumer_data *consumer_data)
{
int ret;
- char path[PATH_MAX];
+ char *path = NULL;
switch (consumer_data->type) {
case LTTNG_CONSUMER_KERNEL:
- snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
+ path = config.kconsumerd_path.value;
break;
case LTTNG_CONSUMER64_UST:
- snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
+ path = config.consumerd64_path.value;
break;
case LTTNG_CONSUMER32_UST:
- snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
+ path = config.consumerd32_path.value;
break;
default:
ERR("Consumer type unknown");
ret = -EINVAL;
goto error;
}
+ assert(path);
DBG2("Creating consumer directory: %s", path);
ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
- if (ret < 0) {
- if (errno != EEXIST) {
- PERROR("mkdir");
- ERR("Failed to create %s", path);
- goto error;
- }
- ret = -1;
+ if (ret < 0 && errno != EEXIST) {
+ PERROR("mkdir");
+ ERR("Failed to create %s", path);
+ goto error;
}
if (is_root) {
- ret = chown(path, 0, utils_get_group_id(tracing_group_name));
+ ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value));
if (ret < 0) {
ERR("Unable to set group on %s", path);
PERROR("chown");
}
}
- /* Create the kconsumerd error unix socket */
+ /* Create the consumerd error unix socket */
consumer_data->err_sock =
lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
if (consumer_data->err_sock < 0) {
}
}
-/*
- * Write pidfile using the rundir and opt_pidfile.
- */
static int write_pidfile(void)
{
- int ret;
- char pidfile_path[PATH_MAX];
+ return utils_create_pid_file(getpid(), config.pid_file_path.value);
+}
+
+static int set_clock_plugin_env(void)
+{
+ int ret = 0;
+ char *env_value = NULL;
- assert(rundir);
+ if (!config.lttng_ust_clock_plugin.value) {
+ goto end;
+ }
- if (opt_pidfile) {
- if (lttng_strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path))) {
- ret = -1;
- goto error;
- }
- } else {
- /* Build pidfile path from rundir and opt_pidfile. */
- ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
- DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
- if (ret < 0) {
- PERROR("snprintf pidfile path");
- goto error;
- }
+ ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
+ config.lttng_ust_clock_plugin.value);
+ if (ret < 0) {
+ PERROR("asprintf");
+ goto end;
}
- /*
- * Create pid file in rundir.
- */
- ret = utils_create_pid_file(getpid(), pidfile_path);
-error:
+ ret = putenv(env_value);
+ if (ret) {
+ free(env_value);
+ PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
+ goto end;
+ }
+
+ DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
+ config.lttng_ust_clock_plugin.value);
+end:
return ret;
}
-/*
- * Create lockfile using the rundir and return its fd.
- */
-static int create_lockfile(void)
+static
+struct rotation_thread_timer_queue *create_rotate_timer_queue(void)
{
- int ret;
- char lockfile_path[PATH_MAX];
+ struct rotation_thread_timer_queue *queue = NULL;
- ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
- if (ret < 0) {
- goto error;
+ queue = zmalloc(sizeof(struct rotation_thread_timer_queue));
+ if (!queue) {
+ PERROR("Failed to allocate timer rotate queue");
+ goto end;
}
- ret = utils_create_lock_file(lockfile_path);
-error:
- return ret;
+ queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
+ CDS_INIT_LIST_HEAD(&queue->list);
+ pthread_mutex_init(&queue->lock, NULL);
+
+end:
+ return queue;
}
-/*
- * Write agent TCP port using the rundir.
- */
-static int write_agent_port(void)
+static
+void destroy_rotate_timer_queue(struct rotation_thread_timer_queue *queue)
{
- int ret;
- char path[PATH_MAX];
+ struct sessiond_rotation_timer *node, *tmp_node;
- assert(rundir);
-
- ret = snprintf(path, sizeof(path), "%s/"
- DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir);
- if (ret < 0) {
- PERROR("snprintf agent port path");
- goto error;
+ if (!queue) {
+ return;
}
- /*
- * Create TCP agent port file in rundir.
- */
- ret = utils_create_pid_file(agent_tcp_port, path);
+ lttng_pipe_destroy(queue->event_pipe);
-error:
- return ret;
+ pthread_mutex_lock(&queue->lock);
+ /* Empty wait queue. */
+ cds_list_for_each_entry_safe(node, tmp_node, &queue->list, head) {
+ cds_list_del(&node->head);
+ free(node);
+ }
+ pthread_mutex_unlock(&queue->lock);
+
+ pthread_mutex_destroy(&queue->lock);
+ free(queue);
}
/*
{
int ret = 0, retval = 0;
void *status;
- const char *home_path, *env_app_timeout;
+ const char *env_app_timeout;
struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
*ust64_channel_monitor_pipe = NULL,
*kernel_channel_monitor_pipe = NULL;
- bool notification_thread_running = false;
+ bool notification_thread_launched = false;
+ bool rotation_thread_launched = false;
+ bool timer_thread_launched = false;
+ struct lttng_pipe *ust32_channel_rotate_pipe = NULL,
+ *ust64_channel_rotate_pipe = NULL,
+ *kernel_channel_rotate_pipe = NULL;
+ struct timer_thread_parameters timer_thread_ctx;
+ /* Queue of rotation jobs populated by the sessiond-timer. */
+ struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
+ sem_t notification_thread_ready;
init_kernel_workarounds();
goto exit_set_signal_handler;
}
- setup_consumerd_path();
+ if (sessiond_timer_signal_init()) {
+ retval = -1;
+ goto exit_set_signal_handler;
+ }
page_size = sysconf(_SC_PAGESIZE);
if (page_size < 0) {
WARN("Fallback page size to %ld", page_size);
}
+ ret = sessiond_config_init(&config);
+ if (ret) {
+ retval = -1;
+ goto exit_set_signal_handler;
+ }
+
+ /*
+ * Init config from environment variables.
+ * Command line option override env configuration per-doc. Do env first.
+ */
+ sessiond_config_apply_env_config(&config);
+
/*
* Parse arguments and load the daemon configuration file.
*
goto exit_options;
}
+ /*
+ * Resolve all paths received as arguments, configuration option, or
+ * through environment variable as absolute paths. This is necessary
+ * since daemonizing causes the sessiond's current working directory
+ * to '/'.
+ */
+ ret = sessiond_config_resolve_paths(&config);
+ if (ret) {
+ goto exit_options;
+ }
+
+ /* Apply config. */
+ lttng_opt_verbose = config.verbose;
+ lttng_opt_quiet = config.quiet;
+ kconsumer_data.err_unix_sock_path =
+ config.kconsumerd_err_unix_sock_path.value;
+ kconsumer_data.cmd_unix_sock_path =
+ config.kconsumerd_cmd_unix_sock_path.value;
+ ustconsumer32_data.err_unix_sock_path =
+ config.consumerd32_err_unix_sock_path.value;
+ ustconsumer32_data.cmd_unix_sock_path =
+ config.consumerd32_cmd_unix_sock_path.value;
+ ustconsumer64_data.err_unix_sock_path =
+ config.consumerd64_err_unix_sock_path.value;
+ ustconsumer64_data.cmd_unix_sock_path =
+ config.consumerd64_cmd_unix_sock_path.value;
+ set_clock_plugin_env();
+
+ sessiond_config_log(&config);
+
+ if (create_lttng_rundir()) {
+ retval = -1;
+ goto exit_options;
+ }
+
+ /* Abort launch if a session daemon is already running. */
+ if (check_existing_daemon()) {
+ ERR("A session daemon is already running.");
+ retval = -1;
+ goto exit_options;
+ }
+
/* Daemonize */
- if (opt_daemon || opt_background) {
+ if (config.daemonize || config.background) {
int i;
ret = lttng_daemonize(&child_ppid, &recv_child_signal,
- !opt_background);
+ !config.background);
if (ret < 0) {
retval = -1;
goto exit_options;
/*
* We are in the child. Make sure all other file descriptors are
* closed, in case we are called with more opened file
- * descriptors than the standard ones.
+ * descriptors than the standard ones and the lock file.
*/
for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
+ if (i == lockfile_fd) {
+ continue;
+ }
(void) close(i);
}
}
/* Check if daemon is UID = 0 */
is_root = !getuid();
-
if (is_root) {
- rundir = strdup(DEFAULT_LTTNG_RUNDIR);
- if (!rundir) {
- retval = -1;
- goto exit_init_data;
- }
-
/* Create global run dir with root access */
- if (create_lttng_rundir(rundir)) {
- retval = -1;
- goto exit_init_data;
- }
-
- if (strlen(apps_unix_sock_path) == 0) {
- ret = snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_UNIX_SOCK);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- if (strlen(client_unix_sock_path) == 0) {
- ret = snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- ret = snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
- if (strlen(health_unix_sock_path) == 0) {
- ret = snprintf(health_unix_sock_path,
- sizeof(health_unix_sock_path),
- DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Setup kernel consumerd path */
- ret = snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- ret = snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
-
- DBG2("Kernel consumer err path: %s",
- kconsumer_data.err_unix_sock_path);
- DBG2("Kernel consumer cmd path: %s",
- kconsumer_data.cmd_unix_sock_path);
kernel_channel_monitor_pipe = lttng_pipe_open(0);
if (!kernel_channel_monitor_pipe) {
ERR("Failed to create kernel consumer channel monitor pipe");
retval = -1;
goto exit_init_data;
}
- } else {
- home_path = utils_get_home_dir();
- if (home_path == NULL) {
- /* TODO: Add --socket PATH option */
- ERR("Can't get HOME directory for sockets creation.");
+ kernel_channel_rotate_pipe = lttng_pipe_open(0);
+ if (!kernel_channel_rotate_pipe) {
+ ERR("Failed to create kernel consumer channel rotate pipe");
retval = -1;
goto exit_init_data;
}
-
- /*
- * Create rundir from home path. This will create something like
- * $HOME/.lttng
- */
- ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
-
- if (create_lttng_rundir(rundir)) {
+ kconsumer_data.channel_rotate_pipe =
+ lttng_pipe_release_writefd(
+ kernel_channel_rotate_pipe);
+ if (kconsumer_data.channel_rotate_pipe < 0) {
retval = -1;
goto exit_init_data;
}
-
- if (strlen(apps_unix_sock_path) == 0) {
- ret = snprintf(apps_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_APPS_UNIX_SOCK,
- home_path);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Set the cli tool unix socket path */
- if (strlen(client_unix_sock_path) == 0) {
- ret = snprintf(client_unix_sock_path, PATH_MAX,
- DEFAULT_HOME_CLIENT_UNIX_SOCK,
- home_path);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Set global SHM for ust */
- if (strlen(wait_shm_path) == 0) {
- ret = snprintf(wait_shm_path, PATH_MAX,
- DEFAULT_HOME_APPS_WAIT_SHM_PATH,
- getuid());
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Set health check Unix path */
- if (strlen(health_unix_sock_path) == 0) {
- ret = snprintf(health_unix_sock_path,
- sizeof(health_unix_sock_path),
- DEFAULT_HOME_HEALTH_UNIX_SOCK,
- home_path);
- if (ret < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
- }
-
- lockfile_fd = create_lockfile();
- if (lockfile_fd < 0) {
- retval = -1;
- goto exit_init_data;
}
/* Set consumer initial state */
kernel_consumerd_state = CONSUMER_STOPPED;
ust_consumerd_state = CONSUMER_STOPPED;
- DBG("Client socket path %s", client_unix_sock_path);
- DBG("Application socket path %s", apps_unix_sock_path);
- DBG("Application wait path %s", wait_shm_path);
- DBG("LTTng run directory path: %s", rundir);
-
- /* 32 bits consumerd path setup */
- ret = snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
- if (ret < 0) {
- PERROR("snprintf 32-bit consumer error socket path");
- retval = -1;
- goto exit_init_data;
- }
- ret = snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
- if (ret < 0) {
- PERROR("snprintf 32-bit consumer command socket path");
- retval = -1;
- goto exit_init_data;
- }
-
- 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);
ust32_channel_monitor_pipe = lttng_pipe_open(0);
if (!ust32_channel_monitor_pipe) {
ERR("Failed to create 32-bit user space consumer channel monitor pipe");
retval = -1;
goto exit_init_data;
}
-
- /* 64 bits consumerd path setup */
- ret = snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
- if (ret < 0) {
- PERROR("snprintf 64-bit consumer error socket path");
+ ust32_channel_rotate_pipe = lttng_pipe_open(0);
+ if (!ust32_channel_rotate_pipe) {
+ ERR("Failed to create 32-bit user space consumer channel rotate pipe");
retval = -1;
goto exit_init_data;
}
- ret = snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
- if (ret < 0) {
- PERROR("snprintf 64-bit consumer command socket path");
+ ustconsumer32_data.channel_rotate_pipe = lttng_pipe_release_writefd(
+ ust32_channel_rotate_pipe);
+ if (ustconsumer32_data.channel_rotate_pipe < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
+
+ /*
+ * The rotation_timer_queue structure is shared between the sessiond timer
+ * thread and the rotation thread. The main() keeps the ownership and
+ * destroys it when both threads have quit.
+ */
+ rotation_timer_queue = create_rotate_timer_queue();
+ if (!rotation_timer_queue) {
retval = -1;
goto exit_init_data;
}
+ timer_thread_ctx.rotation_timer_queue = rotation_timer_queue;
- 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);
ust64_channel_monitor_pipe = lttng_pipe_open(0);
if (!ust64_channel_monitor_pipe) {
ERR("Failed to create 64-bit user space consumer channel monitor pipe");
retval = -1;
goto exit_init_data;
}
-
- /*
- * See if daemon already exist.
- */
- if (check_existing_daemon()) {
- ERR("Already running daemon.\n");
- /*
- * We do not goto exit because we must not cleanup()
- * because a daemon is already running.
- */
+ ust64_channel_rotate_pipe = lttng_pipe_open(0);
+ if (!ust64_channel_rotate_pipe) {
+ ERR("Failed to create 64-bit user space consumer channel rotate pipe");
+ retval = -1;
+ goto exit_init_data;
+ }
+ ustconsumer64_data.channel_rotate_pipe = lttng_pipe_release_writefd(
+ ust64_channel_rotate_pipe);
+ if (ustconsumer64_data.channel_rotate_pipe < 0) {
retval = -1;
goto exit_init_data;
}
* kernel tracer.
*/
if (is_root) {
- if (set_consumer_sockets(&kconsumer_data, rundir)) {
+ if (set_consumer_sockets(&kconsumer_data)) {
retval = -1;
goto exit_init_data;
}
/* Setup kernel tracer */
- if (!opt_no_kernel) {
+ if (!config.no_kernel) {
init_kernel_tracer();
if (kernel_tracer_fd >= 0) {
ret = syscall_init_table();
/* init lttng_fd tracking must be done after set_ulimit. */
lttng_fd_init();
- if (set_consumer_sockets(&ustconsumer64_data, rundir)) {
+ if (set_consumer_sockets(&ustconsumer64_data)) {
retval = -1;
goto exit_init_data;
}
- if (set_consumer_sockets(&ustconsumer32_data, rundir)) {
+ if (set_consumer_sockets(&ustconsumer32_data)) {
retval = -1;
goto exit_init_data;
}
}
/* Set credentials to socket */
- if (is_root && set_permissions(rundir)) {
+ if (is_root && set_permissions(config.rundir.value)) {
retval = -1;
goto exit_init_data;
}
/* Get parent pid if -S, --sig-parent is specified. */
- if (opt_sig_parent) {
+ if (config.sig_parent) {
ppid = getppid();
}
/* Setup the kernel pipe for waking up the kernel thread */
- if (is_root && !opt_no_kernel) {
+ if (is_root && !config.no_kernel) {
if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
retval = -1;
goto exit_init_data;
/* Check for the application socket timeout env variable. */
env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
if (env_app_timeout) {
- app_socket_timeout = atoi(env_app_timeout);
+ config.app_socket_timeout = atoi(env_app_timeout);
} else {
- app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
+ config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
}
ret = write_pidfile();
retval = -1;
goto exit_init_data;
}
- ret = write_agent_port();
- if (ret) {
- ERR("Error in write_agent_port");
- retval = -1;
- goto exit_init_data;
- }
/* Initialize communication library */
lttcomm_init();
retval = -1;
goto exit_init_data;
}
- load_info->path = opt_load_session_path;
+ load_info->path = config.load_session_path.value;
/* Create health-check thread. */
ret = pthread_create(&health_thread, default_pthread_attr(),
goto exit_health;
}
+ /*
+ * The rotation thread needs the notification thread to be ready before
+ * creating the rotate_notification_channel, so we use this semaphore as
+ * a rendez-vous point.
+ */
+ sem_init(¬ification_thread_ready, 0, 0);
+
/* notification_thread_data acquires the pipes' read side. */
notification_thread_handle = notification_thread_handle_create(
ust32_channel_monitor_pipe,
ust64_channel_monitor_pipe,
- kernel_channel_monitor_pipe);
+ kernel_channel_monitor_pipe,
+ ¬ification_thread_ready);
if (!notification_thread_handle) {
retval = -1;
ERR("Failed to create notification thread shared data");
stop_threads();
goto exit_notification;
}
- notification_thread_running = true;
+ notification_thread_launched = true;
+
+ /* Create timer thread. */
+ ret = pthread_create(&timer_thread, default_pthread_attr(),
+ sessiond_timer_thread, &timer_thread_ctx);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create timer");
+ retval = -1;
+ stop_threads();
+ goto exit_notification;
+ }
+ timer_thread_launched = true;
+
+ /* rotation_thread_data acquires the pipes' read side. */
+ rotation_thread_handle = rotation_thread_handle_create(
+ ust32_channel_rotate_pipe,
+ ust64_channel_rotate_pipe,
+ kernel_channel_rotate_pipe,
+ thread_quit_pipe[0],
+ rotation_timer_queue,
+ notification_thread_handle,
+ ¬ification_thread_ready);
+ if (!rotation_thread_handle) {
+ retval = -1;
+ ERR("Failed to create rotation thread shared data");
+ stop_threads();
+ goto exit_rotation;
+ }
+
+ /* Create rotation thread. */
+ ret = pthread_create(&rotation_thread, default_pthread_attr(),
+ thread_rotation, rotation_thread_handle);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create rotation");
+ retval = -1;
+ stop_threads();
+ goto exit_rotation;
+ }
+ rotation_thread_launched = true;
/* Create thread to manage the client socket */
ret = pthread_create(&client_thread, default_pthread_attr(),
}
/* Don't start this thread if kernel tracing is not requested nor root */
- if (is_root && !opt_no_kernel) {
+ if (is_root && !config.no_kernel) {
/* Create kernel thread to manage kernel event */
ret = pthread_create(&kernel_thread, default_pthread_attr(),
thread_manage_kernel, (void *) NULL);
}
exit_load_session:
- if (is_root && !opt_no_kernel) {
+ if (is_root && !config.no_kernel) {
ret = pthread_join(kernel_thread, &status);
if (ret) {
errno = ret;
}
exit_client:
+exit_rotation:
exit_notification:
+ sem_destroy(¬ification_thread_ready);
ret = pthread_join(health_thread, &status);
if (ret) {
errno = ret;
* of the active session and channels at the moment of the teardown.
*/
if (notification_thread_handle) {
- if (notification_thread_running) {
+ if (notification_thread_launched) {
notification_thread_command_quit(
notification_thread_handle);
ret = pthread_join(notification_thread, &status);
notification_thread_handle_destroy(notification_thread_handle);
}
+ if (rotation_thread_handle) {
+ if (rotation_thread_launched) {
+ ret = pthread_join(rotation_thread, &status);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join rotation thread");
+ retval = -1;
+ }
+ }
+ rotation_thread_handle_destroy(rotation_thread_handle);
+ }
+
+ if (timer_thread_launched) {
+ kill(getpid(), LTTNG_SESSIOND_SIG_EXIT);
+ ret = pthread_join(timer_thread, &status);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join timer thread");
+ retval = -1;
+ }
+ }
+
+ /*
+ * After the rotation and timer thread have quit, we can safely destroy
+ * the rotation_timer_queue.
+ */
+ destroy_rotate_timer_queue(rotation_timer_queue);
+
rcu_thread_offline();
rcu_unregister_thread();
lttng_pipe_destroy(ust32_channel_monitor_pipe);
lttng_pipe_destroy(ust64_channel_monitor_pipe);
lttng_pipe_destroy(kernel_channel_monitor_pipe);
+ lttng_pipe_destroy(ust32_channel_rotate_pipe);
+ lttng_pipe_destroy(ust64_channel_rotate_pipe);
+ lttng_pipe_destroy(kernel_channel_rotate_pipe);
exit_ht_cleanup:
health_app_destroy(health_sessiond);
exit_create_run_as_worker_cleanup:
exit_options:
+ sessiond_cleanup_lock_file();
sessiond_cleanup_options();
exit_set_signal_handler:
projects / lttng-tools.git / blobdiff