Gen-ust-events: use options instead of arguments

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index ec907628dd5628f0bf77752fc0a5752f2c9911dc..670ebc747c74249ced48f060433365b767329942 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -77,6 +77,7 @@
 #include "agent.h"
 #include "ht-cleanup.h"
 #include "sessiond-config.h"
+#include "clear.h"
 
 static const char *help_msg =
 #ifdef LTTNG_EMBED_HELP
@@ -547,15 +548,9 @@ static void sessiond_cleanup(void)
         */
        utils_close_pipe(thread_quit_pipe);
 
-       /*
-        * If config.pid_file_path.value is undefined, the default file will be
-        * wiped when removing the rundir.
-        */
-       if (config.pid_file_path.value) {
-               ret = remove(config.pid_file_path.value);
-               if (ret < 0) {
-                       PERROR("remove pidfile %s", config.pid_file_path.value);
-               }
+       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",
@@ -2442,7 +2437,8 @@ static pid_t spawn_consumerd(struct consumer_data *consumer_data)
                        } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
                                DBG3("Found location #2");
                                consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
-                       } else if (stat(config.consumerd32_bin_path.value, &st) == 0) {
+                       } else if (config.consumerd32_bin_path.value &&
+                                       stat(config.consumerd32_bin_path.value, &st) == 0) {
                                DBG3("Found location #3");
                                consumer_to_use = config.consumerd32_bin_path.value;
                        } else {
@@ -2934,6 +2930,7 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
        case LTTNG_REGENERATE_STATEDUMP:
        case LTTNG_REGISTER_TRIGGER:
        case LTTNG_UNREGISTER_TRIGGER:
+       case LTTNG_CLEAR_SESSION:
                need_domain = 0;
                break;
        default:
@@ -4064,6 +4061,14 @@ error_add_context:
                                notification_thread_handle);
                break;
        }
+       case LTTNG_CLEAR_SESSION:
+       {
+               ret = cmd_clear_session(cmd_ctx->session);
+               if (ret != LTTNG_OK) {
+                       goto error;
+               }
+               break;
+       }
        default:
                ret = LTTNG_ERR_UND;
                break;
@@ -4352,8 +4357,17 @@ static void *thread_manage_clients(void *data)
                if (ret > 0 || (ret < 0 && errno != EINTR)) {
                        goto exit;
                }
-               cmm_smp_rmb();
        }
+       /*
+        * 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)) {
@@ -5543,6 +5557,12 @@ int main(int argc, char **argv)
                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.
         *
@@ -5557,9 +5577,6 @@ int main(int argc, char **argv)
                goto exit_options;
        }
 
-       /* Init config from environment variables. */
-       sessiond_config_apply_env_config(&config);
-
        /*
         * Resolve all paths received as arguments, configuration option, or
         * through environment variable as absolute paths. This is necessary