#include <sys/wait.h>
#include <urcu/uatomic.h>
#include <unistd.h>
+#include <ctype.h>
#include <common/common.h>
#include <common/compat/socket.h>
#include "load-session-thread.h"
#include "syscall.h"
#include "agent.h"
+#include "ht-cleanup.h"
#define CONSUMERD_FILE "lttng-consumerd"
static pid_t child_ppid; /* Internal parent PID use with daemonize. */
static char *rundir;
static int lockfile_fd = -1;
+static int opt_print_version;
/* Set to 1 when a SIGUSR1 signal is received. */
static int recv_child_signal;
* for all threads when receiving an event on the pipe.
*/
static int thread_quit_pipe[2] = { -1, -1 };
-static int ht_cleanup_quit_pipe[2] = { -1, -1 };
/*
* This pipe is used to inform the thread managing application communication
struct lttng_ht *agent_apps_ht_by_sock = NULL;
/*
- * Whether sessiond is ready for commands/health check requests.
- * NR_LTTNG_SESSIOND_READY must match the number of calls to
- * sessiond_notify_ready().
+ * 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.
+ *
+ * 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 two (2) support threads are:
+ * - agent_thread
+ * - health_thread
*/
-#define NR_LTTNG_SESSIOND_READY 3
-int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
+int lttng_sessiond_ready = 2;
+
+int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
+{
+ return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0;
+}
/* 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 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 the parent of the fork() process that we are
+ * ready.
+ */
+ if (opt_daemon || opt_background) {
+ kill(child_ppid, SIGUSR1);
}
}
+LTTNG_HIDDEN
+void sessiond_notify_ready(void)
+{
+ /*
+ * The _return variant is used since the implied memory barriers are
+ * required.
+ */
+ (void) uatomic_sub_return(<tng_sessiond_ready, 1);
+}
+
static
void setup_consumerd_path(void)
{
return __sessiond_set_thread_pollset(events, size, thread_quit_pipe);
}
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-int sessiond_set_ht_cleanup_thread_pollset(struct lttng_poll_event *events,
- size_t size)
-{
- return __sessiond_set_thread_pollset(events, size,
- ht_cleanup_quit_pipe);
-}
-
-static
-int __sessiond_check_thread_quit_pipe(int fd, uint32_t events, int a_pipe)
-{
- if (fd == a_pipe && (events & LPOLLIN)) {
- return 1;
- }
- return 0;
-}
-
-/*
- * Check if the thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
-{
- return __sessiond_check_thread_quit_pipe(fd, events,
- thread_quit_pipe[0]);
-}
-
-/*
- * Check if the ht_cleanup thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-int sessiond_check_ht_cleanup_quit(int fd, uint32_t events)
-{
- return __sessiond_check_thread_quit_pipe(fd, events,
- ht_cleanup_quit_pipe[0]);
-}
-
/*
* Init thread quit pipe.
*
return __init_thread_quit_pipe(thread_quit_pipe);
}
-static int init_ht_cleanup_quit_pipe(void)
-{
- return __init_thread_quit_pipe(ht_cleanup_quit_pipe);
-}
-
/*
* Stop all threads by closing the thread quit pipe.
*/
ret = waitpid(consumer_data->pid, &status, 0);
if (ret == -1) {
PERROR("consumerd waitpid pid: %d", consumer_data->pid)
- }
- if (!WIFEXITED(status)) {
+ } else if (!WIFEXITED(status)) {
ERR("consumerd termination with error: %d",
WEXITSTATUS(ret));
}
free(kmod_extra_probes_list);
run_as_destroy_worker();
-
- /* <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> */
}
/*
consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
if (consumer_data->metadata_sock.lock == NULL) {
PERROR("zmalloc pthread mutex");
- ret = -1;
goto error;
}
pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
.count = 0,
};
+ rcu_register_thread();
+
health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
if (testpoint(sessiond_thread_app_reg_dispatch)) {
DBG("[thread] Dispatch UST command started");
- while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
+ for (;;) {
health_code_update();
/* Atomically prepare the queue futex */
futex_nto1_prepare(&ust_cmd_queue.futex);
+ if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
+ break;
+ }
+
do {
struct ust_app *app = NULL;
ust_cmd = NULL;
ERR("Health error occurred in %s", __func__);
}
health_unregister(health_sessiond);
+ rcu_unregister_thread();
return NULL;
}
* lttcomm_setsockopt_snd_timeout expect msec as
* parameter.
*/
- (void) lttcomm_setsockopt_rcv_timeout(sock,
- app_socket_timeout * 1000);
- (void) lttcomm_setsockopt_snd_timeout(sock,
- app_socket_timeout * 1000);
+ if (app_socket_timeout >= 0) {
+ (void) lttcomm_setsockopt_rcv_timeout(sock,
+ app_socket_timeout * 1000);
+ (void) lttcomm_setsockopt_snd_timeout(sock,
+ app_socket_timeout * 1000);
+ }
/*
* Set the CLOEXEC flag. Return code is useless because
int ret, clock_ret;
struct timespec timeout;
- /* Make sure we set the readiness flag to 0 because we are NOT ready */
+ /*
+ * Make sure we set the readiness flag to 0 because we are NOT ready.
+ * This access to consumer_thread_is_ready does not need to be
+ * protected by consumer_data.cond_mutex (yet) since the consumer
+ * management thread has not been started at this point.
+ */
consumer_data->consumer_thread_is_ready = 0;
/* Setup pthread condition */
goto error;
}
- ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
- consumer_data);
+ ret = pthread_create(&consumer_data->thread, default_pthread_attr(),
+ thread_manage_consumer, consumer_data);
if (ret) {
errno = ret;
PERROR("pthread_create consumer");
pthread_mutex_lock(&consumer_data->cond_mutex);
/* Get time for sem_timedwait absolute timeout */
- clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
+ clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout);
/*
* Set the timeout for the condition timed wait even if the clock gettime
* call fails since we might loop on that call and we want to avoid to
} 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,
break;
}
default:
- PERROR("unknown consumer type");
+ ERR("unknown consumer type");
exit(EXIT_FAILURE);
}
if (errno != 0) {
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;
}
case LTTNG_SNAPSHOT_RECORD:
case LTTNG_SAVE_SESSION:
case LTTNG_SET_SESSION_SHM_PATH:
+ case LTTNG_REGENERATE_METADATA:
+ case LTTNG_REGENERATE_STATEDUMP:
need_domain = 0;
break;
default:
case LTTNG_LIST_EVENTS:
case LTTNG_LIST_SYSCALLS:
case LTTNG_LIST_TRACKER_PIDS:
+ case LTTNG_DATA_PENDING:
break;
default:
/* Setup lttng message with no payload */
case LTTNG_CREATE_SESSION:
case LTTNG_CREATE_SESSION_SNAPSHOT:
case LTTNG_CREATE_SESSION_LIVE:
- case LTTNG_CALIBRATE:
case LTTNG_LIST_SESSIONS:
case LTTNG_LIST_TRACEPOINTS:
case LTTNG_LIST_SYSCALLS:
if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
switch (cmd_ctx->lsm->domain.type) {
+ case LTTNG_DOMAIN_NONE:
+ break;
case LTTNG_DOMAIN_JUL:
case LTTNG_DOMAIN_LOG4J:
case LTTNG_DOMAIN_PYTHON:
goto error;
}
break;
+ default:
+ ret = LTTNG_ERR_UNKNOWN_DOMAIN;
+ goto error;
}
}
ret = LTTNG_OK;
break;
}
- case LTTNG_CALIBRATE:
- {
- ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
- &cmd_ctx->lsm->u.calibrate);
- break;
- }
case LTTNG_REGISTER_CONSUMER:
{
struct consumer_data *cdata;
cmd_ctx->lsm->u.set_shm_path.shm_path);
break;
}
+ case LTTNG_REGENERATE_METADATA:
+ {
+ ret = cmd_regenerate_metadata(cmd_ctx->session);
+ break;
+ }
+ case LTTNG_REGENERATE_STATEDUMP:
+ {
+ ret = cmd_regenerate_statedump(cmd_ctx->session);
+ break;
+ }
default:
ret = LTTNG_ERR_UND;
break;
sock = lttcomm_create_unix_sock(health_unix_sock_path);
if (sock < 0) {
ERR("Unable to create health check Unix socket");
- ret = -1;
goto error;
}
if (ret < 0) {
ERR("Unable to set group on %s", health_unix_sock_path);
PERROR("chown");
- ret = -1;
goto error;
}
if (ret < 0) {
ERR("Unable to set permissions on %s", health_unix_sock_path);
PERROR("chmod");
- ret = -1;
goto error;
}
}
if (ret) {
PERROR("close");
}
- new_sock = -1;
continue;
}
if (ret) {
PERROR("close");
}
- new_sock = -1;
}
exit:
}
lttng_poll_clean(&events);
-
+ stop_threads();
rcu_unregister_thread();
return NULL;
}
goto error;
}
- sessiond_notify_ready();
ret = sem_post(&load_info->message_thread_ready);
if (ret) {
PERROR("sem_post message_thread_ready");
goto error;
}
+ /*
+ * 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;
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, " -b, --background Start as a daemon, keeping console open.\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 SIGUSR1 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, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
- fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
- fprintf(stderr, " --no-kernel Disable kernel tracer\n");
- fprintf(stderr, " --agent-tcp-port Agent registration TCP port\n");
- fprintf(stderr, " -f --config PATH Load daemon configuration file\n");
- fprintf(stderr, " -l --load PATH Load session configuration\n");
- fprintf(stderr, " --kmod-probes Specify kernel module probes to load\n");
- fprintf(stderr, " --extra-kmod-probes Specify extra kernel module probes to load\n");
-}
-
static int string_match(const char *str1, const char *str2)
{
return (str1 && str2) && !strcmp(str1, str2);
{
int ret = 0;
- if (arg && arg[0] == '\0') {
- /*
- * This only happens if the value is read from daemon config
- * file. This means the option requires an argument and the
- * configuration file contains a line such as:
- * my_option =
- */
- ret = -EINVAL;
- goto end;
- }
-
if (string_match(optname, "client-sock") || opt == 'c') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-c, --client-sock");
snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "apps-sock") || opt == 'a') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-a, --apps-sock");
} else if (string_match(optname, "background") || opt == 'b') {
opt_background = 1;
} else if (string_match(optname, "group") || opt == 'g') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-g, --group");
tracing_group_name_override = 1;
}
} else if (string_match(optname, "help") || opt == 'h') {
- usage();
- exit(EXIT_SUCCESS);
+ ret = utils_show_man_page(8, "lttng-sessiond");
+ if (ret) {
+ ERR("Cannot view man page lttng-sessiond(8)");
+ perror("exec");
+ }
+ exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
} else if (string_match(optname, "version") || opt == 'V') {
- fprintf(stdout, "%s\n", VERSION);
- exit(EXIT_SUCCESS);
+ opt_print_version = 1;
} else if (string_match(optname, "sig-parent") || opt == 'S') {
opt_sig_parent = 1;
} else if (string_match(optname, "kconsumerd-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kconsumerd-err-sock");
snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "kconsumerd-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kconsumerd-cmd-sock");
snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "ustconsumerd64-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd64-err-sock");
snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd64-cmd-sock");
snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "ustconsumerd32-err-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd32-err-sock");
snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
}
} else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--ustconsumerd32-cmd-sock");
if (arg) {
opt_verbose_consumer = config_parse_value(arg);
} else {
- opt_verbose_consumer += 1;
+ opt_verbose_consumer++;
}
} else if (string_match(optname, "consumerd32-path")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd32-path");
consumerd32_bin_override = 1;
}
} else if (string_match(optname, "consumerd32-libdir")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd32-libdir");
consumerd32_libdir_override = 1;
}
} else if (string_match(optname, "consumerd64-path")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd64-path");
consumerd64_bin_override = 1;
}
} else if (string_match(optname, "consumerd64-libdir")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--consumerd64-libdir");
consumerd64_libdir_override = 1;
}
} else if (string_match(optname, "pidfile") || opt == 'p') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-p, --pidfile");
}
}
} else if (string_match(optname, "agent-tcp-port")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--agent-tcp-port");
} else {
unsigned long v;
- if (!arg) {
- ret = -EINVAL;
- goto end;
- }
errno = 0;
v = strtoul(arg, NULL, 0);
if (errno != 0 || !isdigit(arg[0])) {
DBG3("Agent TCP port set to non default: %u", agent_tcp_port);
}
} else if (string_match(optname, "load") || opt == 'l') {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"-l, --load");
}
}
} else if (string_match(optname, "kmod-probes")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--kmod-probes");
}
}
} else if (string_match(optname, "extra-kmod-probes")) {
+ if (!arg || *arg == '\0') {
+ ret = -EINVAL;
+ goto end;
+ }
if (lttng_is_setuid_setgid()) {
WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
"--extra-kmod-probes");
return ret;
}
+static void sessiond_config_log(void)
+{
+ DBG("LTTng-sessiond " VERSION " - " VERSION_NAME "%s%s",
+ GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION,
+ EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME);
+ if (EXTRA_VERSION_DESCRIPTION[0] != '\0') {
+ DBG("LTTng-sessiond extra version description:\n\t" EXTRA_VERSION_DESCRIPTION "\n");
+ }
+ if (EXTRA_VERSION_PATCHES[0] != '\0') {
+ DBG("LTTng-sessiond extra patches:\n\t" EXTRA_VERSION_PATCHES "\n");
+ }
+}
+
+static void print_version(void) {
+ fprintf(stdout, "%s\n", VERSION);
+}
+
/*
* daemon configuration loading and argument parsing
*/
static void sighandler(int sig)
{
switch (sig) {
- case SIGPIPE:
- DBG("SIGPIPE caught");
- return;
case SIGINT:
DBG("SIGINT caught");
stop_threads();
return ret;
}
- sa.sa_handler = sighandler;
sa.sa_mask = sigset;
sa.sa_flags = 0;
+
+ sa.sa_handler = sighandler;
if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
PERROR("sigaction");
return ret;
return ret;
}
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
+ if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
PERROR("sigaction");
return ret;
}
- if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
+ sa.sa_handler = SIG_IGN;
+ if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
PERROR("sigaction");
return ret;
}
/*
* Set open files limit to unlimited. This daemon can open a large number of
- * file descriptors in order to consumer multiple kernel traces.
+ * file descriptors in order to consume multiple kernel traces.
*/
static void set_ulimit(void)
{
int ret;
struct rlimit lim;
- /* The kernel does not allowed an infinite limit for open files */
+ /* The kernel does not allow an infinite limit for open files */
lim.rlim_cur = 65535;
lim.rlim_max = 65535;
assert(rundir);
if (opt_pidfile) {
- strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
+ 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/"
return ret;
}
+static int set_clock_plugin_env(void)
+{
+ int ret = 0;
+ const char *original_env_value;
+ char *full_path = NULL;
+ char *new_env_value = NULL;
+
+ original_env_value = getenv("LTTNG_UST_CLOCK_PLUGIN");
+ if (!original_env_value) {
+ goto end;
+ }
+
+ full_path = utils_expand_path(original_env_value);
+ if (!full_path) {
+ ERR("Failed to expand LTTNG_UST_CLOCK_PLUGIN path \"%s\"",
+ original_env_value);
+ ret = -1;
+ goto end;
+ }
+ ret = asprintf(&new_env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
+ full_path);
+ free(full_path);
+ if (ret < 0) {
+ PERROR("asprintf");
+ goto end;
+ }
+
+ DBG("Updating environment: %s", new_env_value);
+ ret = putenv(new_env_value);
+ if (ret) {
+ free(new_env_value);
+ PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
+ goto end;
+ }
+end:
+ return ret;
+}
+
/*
* main
*/
goto exit_options;
}
+ sessiond_config_log();
+
+ if (opt_print_version) {
+ print_version();
+ retval = 0;
+ goto exit_options;
+ }
+
+ ret = set_clock_plugin_env();
+ if (ret) {
+ retval = -1;
+ goto exit_options;
+ }
+
/* Daemonize */
if (opt_daemon || opt_background) {
int i;
goto exit_health_sessiond_cleanup;
}
- if (init_ht_cleanup_quit_pipe()) {
- retval = -1;
- goto exit_ht_cleanup_quit_pipe;
- }
-
- /* Setup the thread ht_cleanup communication pipe. */
- if (utils_create_pipe_cloexec(ht_cleanup_pipe)) {
- retval = -1;
- goto exit_ht_cleanup_pipe;
- }
-
- /* Set up max poll set size */
- if (lttng_poll_set_max_size()) {
- retval = -1;
- goto exit_set_max_size;
- }
-
/* Create thread to clean up RCU hash tables */
- ret = pthread_create(&ht_cleanup_thread, NULL,
- thread_ht_cleanup, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create ht_cleanup");
+ if (init_ht_cleanup_thread(&ht_cleanup_thread)) {
retval = -1;
goto exit_ht_cleanup;
}
load_info->path = opt_load_session_path;
/* Create health-check thread */
- ret = pthread_create(&health_thread, NULL,
+ ret = pthread_create(&health_thread, default_pthread_attr(),
thread_manage_health, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create thread to manage the client socket */
- ret = pthread_create(&client_thread, NULL,
+ ret = pthread_create(&client_thread, default_pthread_attr(),
thread_manage_clients, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create thread to dispatch registration */
- ret = pthread_create(&dispatch_thread, NULL,
+ ret = pthread_create(&dispatch_thread, default_pthread_attr(),
thread_dispatch_ust_registration, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create thread to manage application registration. */
- ret = pthread_create(®_apps_thread, NULL,
+ ret = pthread_create(®_apps_thread, default_pthread_attr(),
thread_registration_apps, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create thread to manage application socket */
- ret = pthread_create(&apps_thread, NULL,
+ ret = pthread_create(&apps_thread, default_pthread_attr(),
thread_manage_apps, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create thread to manage application notify socket */
- ret = pthread_create(&apps_notify_thread, NULL,
+ ret = pthread_create(&apps_notify_thread, default_pthread_attr(),
ust_thread_manage_notify, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create agent registration thread. */
- ret = pthread_create(&agent_reg_thread, NULL,
+ ret = pthread_create(&agent_reg_thread, default_pthread_attr(),
agent_thread_manage_registration, (void *) NULL);
if (ret) {
errno = ret;
/* Don't start this thread if kernel tracing is not requested nor root */
if (is_root && !opt_no_kernel) {
/* Create kernel thread to manage kernel event */
- ret = pthread_create(&kernel_thread, NULL,
+ ret = pthread_create(&kernel_thread, default_pthread_attr(),
thread_manage_kernel, (void *) NULL);
if (ret) {
errno = ret;
}
/* Create session loading thread. */
- ret = pthread_create(&load_session_thread, NULL, thread_load_session,
- load_info);
+ ret = pthread_create(&load_session_thread, default_pthread_attr(),
+ thread_load_session, load_info);
if (ret) {
errno = ret;
PERROR("pthread_create load_session_thread");
exit_health:
exit_init_data:
+ /*
+ * Wait for all pending call_rcu work to complete before tearing
+ * down data structures. call_rcu worker may be trying to
+ * perform lookups in those structures.
+ */
+ rcu_barrier();
/*
* sessiond_cleanup() is called when no other thread is running, except
* the ht_cleanup thread, which is needed to destroy the hash tables.
rcu_thread_offline();
rcu_unregister_thread();
- ret = notify_thread_pipe(ht_cleanup_quit_pipe[1]);
- if (ret < 0) {
- ERR("write error on ht_cleanup quit pipe");
- retval = -1;
- }
+ /*
+ * Ensure all prior call_rcu are done. call_rcu callbacks may push
+ * hash tables to the ht_cleanup thread. Therefore, we ensure that
+ * the queue is empty before shutting down the clean-up thread.
+ */
+ rcu_barrier();
- ret = pthread_join(ht_cleanup_thread, &status);
+ ret = fini_ht_cleanup_thread(&ht_cleanup_thread);
if (ret) {
- errno = ret;
- PERROR("pthread_join ht cleanup thread");
retval = -1;
}
exit_ht_cleanup:
-exit_set_max_size:
-
- utils_close_pipe(ht_cleanup_pipe);
-exit_ht_cleanup_pipe:
-
- /*
- * Close the ht_cleanup quit pipe.
- */
- utils_close_pipe(ht_cleanup_quit_pipe);
-exit_ht_cleanup_quit_pipe:
health_app_destroy(health_sessiond);
exit_health_sessiond_cleanup:
exit_create_run_as_worker_cleanup:
exit_options:
- /* Ensure all prior call_rcu are done. */
- rcu_barrier();
-
sessiond_cleanup_options();
exit_set_signal_handler:
projects / lttng-tools.git / blobdiff