X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fmain.c;h=a6c45c2ed90942e03ba45a36f79a9ca6af538112;hb=00fb02ace5151a6546f4e97e5439512913a50e68;hp=10802aa7b2cc66d87d0946ee53623b05b47a1c0f;hpb=e6142f2e647e83238b1e399b1264e8adb05409f9;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 10802aa7b..a6c45c2ed 100644
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -94,6 +94,9 @@ 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.
@@ -1270,6 +1273,7 @@ restart:
 	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);
@@ -1445,7 +1449,17 @@ error_poll:
 }
 
 /*
- * 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)
 {
@@ -2413,9 +2427,9 @@ static pid_t spawn_consumerd(struct consumer_data *consumer_data)
 			 * fallback on the 32-bit one,
 			 */
 			DBG3("Looking for a kernel consumer at these locations:");
-			DBG3("	1) %s", config.consumerd64_bin_path.value);
+			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);
+			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 = config.consumerd64_bin_path.value;
@@ -2440,33 +2454,30 @@ static pid_t spawn_consumerd(struct consumer_data *consumer_data)
 			break;
 		case LTTNG_CONSUMER64_UST:
 		{
-			char *tmpnew = NULL;
-
-			if (config.consumerd64_lib_dir.value[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(config.consumerd64_lib_dir.value) + 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, 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;
 				}
 			}
@@ -2476,40 +2487,34 @@ static pid_t spawn_consumerd(struct consumer_data *consumer_data)
 					"--consumerd-err-sock", consumer_data->err_unix_sock_path,
 					"--group", config.tracing_group_name.value,
 					NULL);
-			if (config.consumerd64_lib_dir.value[0] != '\0') {
-				free(tmpnew);
-			}
 			break;
 		}
 		case LTTNG_CONSUMER32_UST:
 		{
-			char *tmpnew = NULL;
-
-			if (config.consumerd32_lib_dir.value[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(config.consumerd32_lib_dir.value) + 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, 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;
 				}
 			}
@@ -2519,14 +2524,11 @@ static pid_t spawn_consumerd(struct consumer_data *consumer_data)
 					"--consumerd-err-sock", consumer_data->err_unix_sock_path,
 					"--group", config.tracing_group_name.value,
 					NULL);
-			if (config.consumerd32_lib_dir.value[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()");
@@ -2622,7 +2624,8 @@ static int init_kernel_tracer(void)
 	}
 
 	/* 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;
 	}
@@ -2829,20 +2832,6 @@ static int create_kernel_session(struct ltt_session *session)
 		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;
@@ -5584,12 +5573,13 @@ int main(int argc, char **argv)
 	/* Check if daemon is UID = 0 */
 	is_root = !getuid();
 
+	if (create_lttng_rundir()) {
+		retval = -1;
+		goto exit_init_data;
+	}
+
 	if (is_root) {
 		/* Create global run dir with root access */
-		if (create_lttng_rundir()) {
-			retval = -1;
-			goto exit_init_data;
-		}
 
 		kernel_channel_monitor_pipe = lttng_pipe_open(0);
 		if (!kernel_channel_monitor_pipe) {