* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <unistd.h>
#include <sys/mman.h>
#include <assert.h>
-#include <config.h>
#include <urcu/compiler.h>
#include <ulimit.h>
#include <common/defaults.h>
#include <common/common.h>
-#include <common/consumer.h>
-#include <common/consumer-timer.h>
+#include <common/consumer/consumer.h>
+#include <common/consumer/consumer-timer.h>
#include <common/compat/poll.h>
+#include <common/compat/getenv.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/utils.h>
#include "lttng-consumerd.h"
-
-/* TODO : support UST (all direct kernel-ctl accesses). */
+#include "health-consumerd.h"
/* threads (channel handling, poll, metadata, sessiond) */
-static pthread_t channel_thread, data_thread, metadata_thread, sessiond_thread;
-static pthread_t metadata_timer_thread;
+static pthread_t channel_thread, data_thread, metadata_thread,
+ sessiond_thread, metadata_timer_thread, health_thread;
+static bool metadata_timer_thread_online;
/* to count the number of times the user pressed ctrl+c */
static int sigintcount = 0;
/* Argument variables */
int lttng_opt_quiet; /* not static in error.h */
int lttng_opt_verbose; /* not static in error.h */
+int lttng_opt_mi; /* not static in error.h */
+
static int opt_daemon;
static const char *progname;
static char command_sock_path[PATH_MAX]; /* Global command socket path */
/* the liblttngconsumerd context */
static struct lttng_consumer_local_data *ctx;
+/* Consumerd health monitoring */
+struct health_app *health_consumerd;
+
+const char *tracing_group_name = DEFAULT_TRACING_GROUP;
+
+int lttng_consumer_ready = NR_LTTNG_CONSUMER_READY;
+
+enum lttng_consumer_type lttng_consumer_get_type(void)
+{
+ if (!ctx) {
+ return LTTNG_CONSUMER_UNKNOWN;
+ }
+ return ctx->type;
+}
+
/*
* Signal handler for the daemon
*/
return;
}
- /*
- * Ignore SIGPIPE because it should not stop the consumer whenever a
- * SIGPIPE is catched through a FD operation.
- */
- if (sig == SIGPIPE) {
- return;
+ if (ctx) {
+ lttng_consumer_should_exit(ctx);
}
-
- lttng_consumer_should_exit(ctx);
}
/*
sigset_t sigset;
if ((ret = sigemptyset(&sigset)) < 0) {
- perror("sigemptyset");
+ PERROR("sigemptyset");
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");
+ PERROR("sigaction");
return ret;
}
if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
- perror("sigaction");
+ PERROR("sigaction");
return ret;
}
+ sa.sa_handler = SIG_IGN;
if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- perror("sigaction");
+ PERROR("sigaction");
return ret;
}
fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
fprintf(fp, " -h, --help "
"Display this usage.\n");
- fprintf(fp, " -c, --consumerd-cmd-sock PATH "
+ fprintf(fp, " -c, --consumerd-cmd-sock PATH "
"Specify path for the command socket\n");
- fprintf(fp, " -e, --consumerd-err-sock PATH "
+ fprintf(fp, " -e, --consumerd-err-sock PATH "
"Specify path for the error socket\n");
fprintf(fp, " -d, --daemonize "
"Start as a daemon.\n");
"Verbose mode. Activate DBG() macro.\n");
fprintf(fp, " -V, --version "
"Show version number.\n");
+ fprintf(fp, " -g, --group NAME "
+ "Specify the tracing group name. (default: tracing)\n");
fprintf(fp, " -k, --kernel "
"Consumer kernel buffers (default).\n");
fprintf(fp, " -u, --ust "
/*
* daemon argument parsing
*/
-static void parse_args(int argc, char **argv)
+static int parse_args(int argc, char **argv)
{
- int c;
+ int c, ret = 0;
static struct option long_options[] = {
{ "consumerd-cmd-sock", 1, 0, 'c' },
{ "consumerd-err-sock", 1, 0, 'e' },
{ "daemonize", 0, 0, 'd' },
+ { "group", 1, 0, 'g' },
{ "help", 0, 0, 'h' },
{ "quiet", 0, 0, 'q' },
{ "verbose", 0, 0, 'v' },
while (1) {
int option_index = 0;
- c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
+ c = getopt_long(argc, argv, "dhqvVku" "c:e:g:",
+ long_options, &option_index);
if (c == -1) {
break;
}
switch (c) {
case 0:
- fprintf(stderr, "option %s", long_options[option_index].name);
+ fprintf(stderr, "option %s",
+ long_options[option_index].name);
if (optarg) {
fprintf(stderr, " with arg %s\n", optarg);
+ ret = -1;
+ goto end;
}
break;
case 'c':
- snprintf(command_sock_path, PATH_MAX, "%s", optarg);
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-c, --consumerd-cmd-sock");
+ } else {
+ snprintf(command_sock_path, PATH_MAX, "%s", optarg);
+ }
break;
case 'e':
- snprintf(error_sock_path, PATH_MAX, "%s", optarg);
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-e, --consumerd-err-sock");
+ } else {
+ snprintf(error_sock_path, PATH_MAX, "%s", optarg);
+ }
break;
case 'd':
opt_daemon = 1;
break;
+ case 'g':
+ if (lttng_is_setuid_setgid()) {
+ WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
+ "-g, --group");
+ } else {
+ tracing_group_name = optarg;
+ }
+ break;
case 'h':
usage(stdout);
exit(EXIT_SUCCESS);
lttng_opt_quiet = 1;
break;
case 'v':
- lttng_opt_verbose = 1;
+ lttng_opt_verbose = 3;
break;
case 'V':
fprintf(stdout, "%s\n", VERSION);
#endif
default:
usage(stderr);
- exit(EXIT_FAILURE);
+ ret = -1;
+ goto end;
}
}
+end:
+ return ret;
}
/*
*/
int main(int argc, char **argv)
{
- int ret = 0;
+ int ret = 0, retval = 0;
void *status;
+ struct lttng_consumer_local_data *tmp_ctx;
+
+ rcu_register_thread();
+
+ if (set_signal_handler()) {
+ retval = -1;
+ goto exit_set_signal_handler;
+ }
/* Parse arguments */
progname = argv[0];
- parse_args(argc, argv);
+ if (parse_args(argc, argv)) {
+ retval = -1;
+ goto exit_options;
+ }
/* Daemonize */
if (opt_daemon) {
ret = daemon(0, 0);
if (ret < 0) {
PERROR("daemon");
- goto error;
+ retval = -1;
+ goto exit_options;
}
/*
* We are in the child. Make sure all other file
}
}
- /* Set up max poll set size */
- lttng_poll_set_max_size();
+ /*
+ * Starting from here, we can create threads. This needs to be after
+ * lttng_daemonize due to RCU.
+ */
+
+ health_consumerd = health_app_create(NR_HEALTH_CONSUMERD_TYPES);
+ if (!health_consumerd) {
+ retval = -1;
+ goto exit_health_consumerd_cleanup;
+ }
if (*command_sock_path == '\0') {
switch (opt_type) {
case LTTNG_CONSUMER_KERNEL:
- snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
+ ret = snprintf(command_sock_path, PATH_MAX,
+ DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
case LTTNG_CONSUMER64_UST:
- snprintf(command_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
+ ret = snprintf(command_sock_path, PATH_MAX,
+ DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
+ DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
case LTTNG_CONSUMER32_UST:
- snprintf(command_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
+ ret = snprintf(command_sock_path, PATH_MAX,
+ DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
+ DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
default:
- WARN("Unknown consumerd type");
- goto error;
+ ERR("Unknown consumerd type");
+ retval = -1;
+ goto exit_init_data;
}
}
/* Init */
- lttng_consumer_init();
+ if (lttng_consumer_init()) {
+ retval = -1;
+ goto exit_init_data;
+ }
+
+ /* Initialize communication library */
+ lttcomm_init();
+ /* Initialize TCP timeout values */
+ lttcomm_inet_init();
if (!getuid()) {
/* Set limit for open files */
set_ulimit();
}
+ if (run_as_create_worker(argv[0], NULL, NULL) < 0) {
+ goto exit_init_data;
+ }
+
/* create the consumer instance with and assign the callbacks */
ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
NULL, lttng_consumer_on_recv_stream, NULL);
- if (ctx == NULL) {
- goto error;
+ if (!ctx) {
+ retval = -1;
+ goto exit_init_data;
}
lttng_consumer_set_command_sock_path(ctx, command_sock_path);
if (*error_sock_path == '\0') {
switch (opt_type) {
case LTTNG_CONSUMER_KERNEL:
- snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
+ ret = snprintf(error_sock_path, PATH_MAX,
+ DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
case LTTNG_CONSUMER64_UST:
- snprintf(error_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
+ ret = snprintf(error_sock_path, PATH_MAX,
+ DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
+ DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
case LTTNG_CONSUMER32_UST:
- snprintf(error_sock_path, PATH_MAX,
- DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
+ ret = snprintf(error_sock_path, PATH_MAX,
+ DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
+ DEFAULT_LTTNG_RUNDIR);
+ if (ret < 0) {
+ retval = -1;
+ goto exit_init_data;
+ }
break;
default:
- WARN("Unknown consumerd type");
- goto error;
+ ERR("Unknown consumerd type");
+ retval = -1;
+ goto exit_init_data;
}
}
- if (set_signal_handler() < 0) {
- goto error;
- }
-
/* Connect to the socket created by lttng-sessiond to report errors */
DBG("Connecting to error socket %s", error_sock_path);
ret = lttcomm_connect_unix_sock(error_sock_path);
- /* not a fatal error, but all communication with lttng-sessiond will fail */
+ /*
+ * Not a fatal error, but all communication with lttng-sessiond will
+ * fail.
+ */
if (ret < 0) {
WARN("Cannot connect to error socket (is lttng-sessiond started?)");
}
lttng_consumer_set_error_sock(ctx, ret);
/*
- * For UST consumer, we block RT signals used for periodical metadata flush
- * in main and create a dedicated thread to handle these signals.
+ * Block RT signals used for UST periodical metadata flush and the live
+ * timer in main, and create a dedicated thread to handle these signals.
*/
- switch (opt_type) {
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- consumer_signal_init();
- break;
- default:
- break;
+ if (consumer_signal_init()) {
+ retval = -1;
+ goto exit_init_data;
}
+
ctx->type = opt_type;
+ if (utils_create_pipe(health_quit_pipe)) {
+ retval = -1;
+ goto exit_health_pipe;
+ }
+
+ /* Create thread to manage the client socket */
+ ret = pthread_create(&health_thread, default_pthread_attr(),
+ thread_manage_health, (void *) NULL);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create health");
+ retval = -1;
+ goto exit_health_thread;
+ }
+
+ /*
+ * Wait for health thread to be initialized before letting the
+ * sessiond thread reply to the sessiond that we are ready.
+ */
+ while (uatomic_read(<tng_consumer_ready)) {
+ usleep(100000);
+ }
+ cmm_smp_mb(); /* Read ready before following operations */
+
+ /*
+ * Create the thread to manage the UST metadata periodic timer and
+ * live timer.
+ */
+ ret = pthread_create(&metadata_timer_thread, NULL,
+ consumer_timer_thread, (void *) ctx);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create");
+ retval = -1;
+ goto exit_metadata_timer_thread;
+ }
+ metadata_timer_thread_online = true;
+
/* Create thread to manage channels */
- ret = pthread_create(&channel_thread, NULL, consumer_thread_channel_poll,
+ ret = pthread_create(&channel_thread, default_pthread_attr(),
+ consumer_thread_channel_poll,
(void *) ctx);
- if (ret != 0) {
- perror("pthread_create");
- goto error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create");
+ retval = -1;
+ goto exit_channel_thread;
}
/* Create thread to manage the polling/writing of trace metadata */
- ret = pthread_create(&metadata_thread, NULL, consumer_thread_metadata_poll,
+ ret = pthread_create(&metadata_thread, default_pthread_attr(),
+ consumer_thread_metadata_poll,
(void *) ctx);
- if (ret != 0) {
- perror("pthread_create");
- goto metadata_error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create");
+ retval = -1;
+ goto exit_metadata_thread;
}
/* Create thread to manage the polling/writing of trace data */
- ret = pthread_create(&data_thread, NULL, consumer_thread_data_poll,
- (void *) ctx);
- if (ret != 0) {
- perror("pthread_create");
- goto data_error;
+ ret = pthread_create(&data_thread, default_pthread_attr(),
+ consumer_thread_data_poll, (void *) ctx);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create");
+ retval = -1;
+ goto exit_data_thread;
}
- /* Create the thread to manage the receive of fd */
- ret = pthread_create(&sessiond_thread, NULL, consumer_thread_sessiond_poll,
+ /* Create the thread to manage the reception of fds */
+ ret = pthread_create(&sessiond_thread, default_pthread_attr(),
+ consumer_thread_sessiond_poll,
(void *) ctx);
- if (ret != 0) {
- perror("pthread_create");
- goto sessiond_error;
- }
-
- switch (opt_type) {
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- /* Create the thread to manage the metadata periodic timers */
- ret = pthread_create(&metadata_timer_thread, NULL,
- consumer_timer_metadata_thread, (void *) ctx);
- if (ret != 0) {
- perror("pthread_create");
- goto metadata_timer_error;
- }
-
- ret = pthread_detach(metadata_timer_thread);
- if (ret) {
- errno = ret;
- perror("pthread_detach");
- }
- break;
- default:
- break;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create");
+ retval = -1;
+ goto exit_sessiond_thread;
}
-metadata_timer_error:
+
+ /*
+ * This is where we start awaiting program completion (e.g. through
+ * signal that asks threads to teardown.
+ */
+
ret = pthread_join(sessiond_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join sessiond_thread");
+ retval = -1;
}
+exit_sessiond_thread:
-sessiond_error:
ret = pthread_join(data_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join data_thread");
+ retval = -1;
}
+exit_data_thread:
-data_error:
ret = pthread_join(metadata_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join metadata_thread");
+ retval = -1;
}
+exit_metadata_thread:
-metadata_error:
ret = pthread_join(channel_thread, &status);
- if (ret != 0) {
- perror("pthread_join");
- goto error;
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join channel_thread");
+ retval = -1;
}
+exit_channel_thread:
- if (!ret) {
- ret = EXIT_SUCCESS;
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_SUCCESS);
- goto end;
- }
+exit_metadata_timer_thread:
-error:
- ret = EXIT_FAILURE;
- if (ctx) {
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_EXIT_FAILURE);
+ ret = pthread_join(health_thread, &status);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join health_thread");
+ retval = -1;
}
+exit_health_thread:
-end:
- lttng_consumer_destroy(ctx);
+ utils_close_pipe(health_quit_pipe);
+exit_health_pipe:
+
+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();
lttng_consumer_cleanup();
+ /*
+ * Tearing down the metadata timer thread in a
+ * non-fully-symmetric fashion compared to its creation in case
+ * lttng_consumer_cleanup() ends up tearing down timers (which
+ * requires the timer thread to be alive).
+ */
+ if (metadata_timer_thread_online) {
+ /*
+ * Ensure the metadata timer thread exits only after all other
+ * threads are gone, because it is required to perform timer
+ * teardown synchronization.
+ */
+ kill(getpid(), LTTNG_CONSUMER_SIG_EXIT);
+ ret = pthread_join(metadata_timer_thread, &status);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join metadata_timer_thread");
+ retval = -1;
+ }
+ ret = consumer_timer_thread_get_channel_monitor_pipe();
+ if (ret >= 0) {
+ ret = close(ret);
+ if (ret) {
+ PERROR("close channel monitor pipe");
+ }
+ }
+ metadata_timer_thread_online = false;
+ }
+ tmp_ctx = ctx;
+ ctx = NULL;
+ cmm_barrier(); /* Clear ctx for signal handler. */
+ lttng_consumer_destroy(tmp_ctx);
- return ret;
+ if (health_consumerd) {
+ health_app_destroy(health_consumerd);
+ }
+ /* Ensure all prior call_rcu are done. */
+ rcu_barrier();
+
+ run_as_destroy_worker();
+
+exit_health_consumerd_cleanup:
+exit_options:
+exit_set_signal_handler:
+
+ rcu_unregister_thread();
+
+ if (!retval) {
+ exit(EXIT_SUCCESS);
+ } else {
+ exit(EXIT_FAILURE);
+ }
}
projects / lttng-tools.git / blobdiff