/*
* destroy_session
*
* Unregister the provided session to the session daemon. On success, removes
* the default configuration.
*/
static int destroy_session(struct lttng_session *session)
{
int ret;
ret = lttng_destroy_session(session->name);
if (ret < 0) {
switch (-ret) {
case LTTNG_ERR_SESS_NOT_FOUND:
WARN("Session name %s not found", session->name);
break;
default:
ERR("%s", lttng_strerror(ret));
break;
}
goto error;
}
MSG("Session %s destroyed", session->name);
config_destroy_default();
if (lttng_opt_mi) {
ret = mi_lttng_session(writer, session, 0);
if (ret) {
ret = CMD_ERROR;
goto error;
}
}
ret = CMD_SUCCESS;
error:
return ret;
}
static
int cleanup_session(const char *session_name)
{
int ret;
printf("Stopping session %s", session_name);
ret = lttng_stop_tracing_no_wait(session_name);
if (ret) {
fprintf(stderr, "Failed to stop tracing\n");
goto end;
}
fflush(stdout);
do {
ret = lttng_data_pending(session_name);
if (ret < 0) {
/* Return the data available call error. */
goto end;
}
/*
* Data sleep time before retrying (in usec). Don't sleep if the call
* returned value indicates availability.
*/
if (ret) {
usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
printf(".");
fflush(stdout);
}
} while (ret != 0);
printf("\n");
printf("Destroying session %s\n", session_name);
ret = lttng_destroy_session(session_name);
if (ret) {
fprintf(stderr, "Failed to destroy the session\n");
goto end;
}
ret = 0;
end:
return ret;
}
/*
* Create a tracing session.
* If no name is specified, a default name is generated.
*
* Returns one of the CMD_* result constants.
*/
static int create_session(void)
{
int ret, i;
char shm_path[LTTNG_PATH_MAX] = {};
struct lttng_session_descriptor *session_descriptor = NULL;
enum lttng_session_descriptor_status descriptor_status;
enum lttng_error_code ret_code;
struct lttng_session *sessions = NULL;
const struct lttng_session *created_session = NULL;
const char *created_session_name;
/* Validate options. */
if (opt_session_name) {
if (strlen(opt_session_name) > NAME_MAX) {
ERR("Session name too long. Length must be lower or equal to %d",
NAME_MAX);
ret = CMD_ERROR;
goto error;
}
/*
* Check if the session name begins with "auto-" or is exactly "auto".
* Both are reserved for the default session name. See bug #449 to
* understand why we need to check both here.
*/
if ((strncmp(opt_session_name, DEFAULT_SESSION_NAME "-",
strlen(DEFAULT_SESSION_NAME) + 1) == 0) ||
(strncmp(opt_session_name, DEFAULT_SESSION_NAME,
strlen(DEFAULT_SESSION_NAME)) == 0 &&
strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME))) {
ERR("%s is a reserved keyword for default session(s)",
DEFAULT_SESSION_NAME);
ret = CMD_ERROR;
goto error;
}
}
if (opt_snapshot && opt_live_timer) {
ERR("Snapshot and live modes are mutually exclusive.");
ret = CMD_ERROR;
goto error;
}
if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
ERR("Both control and data URLs must be specified.");
ret = CMD_ERROR;
goto error;
}
session_descriptor = create_session_descriptor();
if (!session_descriptor) {
ret = CMD_ERROR;
goto error;
}
ret_code = lttng_create_session_ext(session_descriptor);
if (ret_code != LTTNG_OK) {
ERR("%s", lttng_strerror(-ret_code));
ret = CMD_ERROR;
goto error;
}
descriptor_status = lttng_session_descriptor_get_session_name(
session_descriptor, &created_session_name);
if (descriptor_status != LTTNG_SESSION_DESCRIPTOR_STATUS_OK) {
ERR("Failed to obtain created session name");
ret = CMD_ERROR;
goto error;
}
ret = lttng_list_sessions(&sessions);
if (ret < 0) {
ERR("Failed to fetch properties of created session: %s",
lttng_strerror(ret));
ret = CMD_ERROR;
goto error;
}
for (i = 0; i < ret; i++) {
if (!strcmp(created_session_name, sessions[i].name)) {
created_session = &sessions[i];
break;
}
}
if (!created_session) {
ERR("Failed to fetch properties of created session");
ret = CMD_ERROR;
goto error;
}
if (opt_shm_path) {
char datetime_suffix[17] = {};
/*
* An auto-generated session name already includes the creation
* timestamp.
*/
if (opt_session_name) {
uint64_t creation_time;
struct tm *timeinfo;
time_t creation_time_t;
size_t strftime_ret;
ret_code = lttng_session_get_creation_time(
created_session,
&creation_time);
if (ret_code != LTTNG_OK) {
ERR("%s", lttng_strerror(-ret_code));
ret = CMD_ERROR;
goto error;
}
creation_time_t = (time_t) creation_time;
timeinfo = localtime(&creation_time_t);
if (!timeinfo) {
PERROR("Failed to interpret session creation time");
ret = CMD_ERROR;
goto error;
}
strftime_ret = strftime(datetime_suffix,
sizeof(datetime_suffix),
"-%Y%m%d-%H%M%S", timeinfo);
if (strftime_ret == 0) {
ERR("Failed to format session creation time.");
ret = CMD_ERROR;
goto error;
}
}
ret = snprintf(shm_path, sizeof(shm_path),
"%s/%s%s", opt_shm_path, created_session_name,
datetime_suffix);
if (ret < 0 || ret >= sizeof(shm_path)) {
ERR("Failed to format the shared memory path.");
ret = CMD_ERROR;
goto error;
}
ret = lttng_set_session_shm_path(created_session_name,
shm_path);
if (ret < 0) {
lttng_destroy_session(created_session_name);
ret = CMD_ERROR;
goto error;
}
}
if (opt_snapshot) {
MSG("Snapshot session %s created.", created_session_name);
} else if (opt_live_timer) {
MSG("Live session %s created.", created_session_name);
} else {
MSG("Session %s created.", created_session_name);
}
if (*created_session->path && !opt_snapshot) {
MSG("Traces will be output to %s", created_session->path);
if (opt_live_timer) {
MSG("Live timer interval set to %u %s", opt_live_timer,
USEC_UNIT);
}
} else if (opt_snapshot) {
struct lttng_snapshot_output_list *list;
struct lttng_snapshot_output *iter;
char snapshot_url[LTTNG_PATH_MAX] = {};
ret = lttng_snapshot_list_output(created_session_name, &list);
if (ret < 0) {
ERR("Failed to list snapshot outputs.");
ret = CMD_ERROR;
goto error;
}
while ((iter = lttng_snapshot_output_list_get_next(list))) {
const char *url = NULL;
url = lttng_snapshot_output_get_ctrl_url(
iter);
ret = lttng_strncpy(snapshot_url, url,
sizeof(snapshot_url));
if (ret) {
snapshot_url[0] = '\0';
ERR("Failed to retrieve snapshot output destination");
}
break;
}
lttng_snapshot_output_list_destroy(list);
if (*snapshot_url) {
MSG("Default snapshot output set to %s",
snapshot_url);
}
MSG("Every channel enabled for this session will be set to mmap output and default to overwrite mode.");
}
if (opt_shm_path) {
MSG("Shared memory path set to %s", shm_path);
}
/* Mi output */
if (lttng_opt_mi) {
ret = mi_created_session(created_session_name);
if (ret) {
ret = CMD_ERROR;
goto error;
}
}
/* Init lttng session config */
ret = config_init(created_session_name);
if (ret < 0) {
ret = CMD_ERROR;
goto error;
}
ret = CMD_SUCCESS;
error:
lttng_session_descriptor_destroy(session_descriptor);
free(sessions);
return ret;
}
static void handle_textdump_sigterm(int signal)
{
quit = 1;
lttng_destroy_session("test");
}
