/*
* Machine interface
* List all availables session
*/
static int mi_list_sessions(struct lttng_session *sessions, int count)
{
int ret, i;
/* Opening sessions element */
ret = mi_lttng_sessions_open(writer);
if (ret) {
goto end;
}
/* Listing sessions */
for (i = 0; i < count; i++) {
ret = mi_lttng_session(writer, &sessions[i], 0);
if (ret) {
goto end;
}
}
/* Closing sessions element */
ret = mi_lttng_writer_close_element(writer);
if (ret) {
goto end;
}
end:
return ret;
}
/*
* Machine interface
* Find the session with session_name as name
* and print his informations.
*/
static int mi_list_session(const char *session_name,
struct lttng_session *sessions, int count)
{
int ret, i;
unsigned int session_found = 0;
if (session_name == NULL) {
ret = -LTTNG_ERR_SESS_NOT_FOUND;
goto end;
}
for (i = 0; i < count; i++) {
if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
/* We need to leave it open to append other informations
* like domain, channel, events etc.*/
session_found = 1;
ret = mi_lttng_session(writer, &sessions[i], 1);
if (ret) {
goto end;
}
break;
}
}
if (!session_found) {
ERR("Session '%s' not found", session_name);
ret = -LTTNG_ERR_SESS_NOT_FOUND;
goto end;
}
end:
return ret;
}
/*
* 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;
}
/*
* Retrieve the created session and mi output it based on provided argument
* This is currently a summary of what was pretty printed and is subject to
* enhancements.
*/
static int mi_created_session(const char *session_name)
{
int ret, i, count, found;
struct lttng_session *sessions;
/* session_name should not be null */
assert(session_name);
assert(writer);
count = lttng_list_sessions(&sessions);
if (count < 0) {
ret = count;
ERR("%s", lttng_strerror(ret));
goto error;
}
if (count == 0) {
ERR("Error session creation failed: session %s not found", session_name);
ret = -LTTNG_ERR_SESS_NOT_FOUND;
goto end;
}
found = 0;
for (i = 0; i < count; i++) {
if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
found = 1;
ret = mi_lttng_session(writer, &sessions[i], 0);
if (ret) {
goto error;
}
break;
}
}
if (!found) {
ret = -LTTNG_ERR_SESS_NOT_FOUND;
} else {
ret = CMD_SUCCESS;
}
error:
free(sessions);
end:
return ret;
}
/*
* 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;
char *session_name = NULL;
bool session_was_stopped;
ret = lttng_stop_tracing_no_wait(session->name);
if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
ERR("%s", lttng_strerror(ret));
}
session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
if (!opt_no_wait) {
bool printed_wait_msg = false;
do {
ret = lttng_data_pending(session->name);
if (ret < 0) {
/* Return the data available call error. */
goto error;
}
/*
* Data sleep time before retrying (in usec). Don't sleep if the call
* returned value indicates availability.
*/
if (ret) {
if (!printed_wait_msg) {
_MSG("Waiting for data availability");
fflush(stdout);
}
printed_wait_msg = true;
usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
_MSG(".");
fflush(stdout);
}
} while (ret != 0);
if (printed_wait_msg) {
MSG("");
}
}
if (!session_was_stopped) {
/*
* Don't print the event and packet loss warnings since the user
* already saw them when stopping the trace.
*/
print_session_stats(session->name);
}
ret = lttng_destroy_session_no_wait(session->name);
if (ret < 0) {
goto error;
}
MSG("Session %s destroyed", session->name);
session_name = get_session_name_quiet();
if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
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:
free(session_name);
return ret;
}