* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <popt.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
+#include <stdbool.h>
+#include <lttng/lttng.h>
#include "../command.h"
+#include <common/mi-lttng.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/utils.h>
+static char *opt_session_name;
static int opt_destroy_all;
+static int opt_no_wait;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-destroy.1.h>
+;
+#endif
+
+/* Mi writer */
+static struct mi_writer *writer;
enum {
OPT_HELP = 1,
{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
{"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+ {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
{0, 0, 0, 0, 0, 0, 0}
};
-/*
- * usage
- */
-static void usage(FILE *ofp)
-{
- fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
- fprintf(ofp, "get it from the configuration directory (.lttng).\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " -h, --help Show this help\n");
- fprintf(ofp, " -a, --all Destroy all sessions\n");
- fprintf(ofp, " --list-options Simple listing of options\n");
- fprintf(ofp, "\n");
-}
-
/*
* destroy_session
*
* Unregister the provided session to the session daemon. On success, removes
* the default configuration.
*/
-static int destroy_session(const char *session_name)
+static int destroy_session(struct lttng_session *session)
{
int ret;
+ char *session_name = NULL;
+ bool session_was_stopped;
+ enum lttng_error_code ret_code;
+ struct lttng_destruction_handle *handle = NULL;
+ enum lttng_destruction_handle_status status;
+ bool printed_wait_msg = false;
+ enum lttng_rotation_state rotation_state;
+
+ 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) {
+ 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 destruction of session \"%s\"",
+ session->name);
+ printed_wait_msg = true;
+ fflush(stdout);
+ }
- ret = lttng_destroy_session(session_name);
- if (ret < 0) {
- switch (-ret) {
- case LTTCOMM_SESS_NOT_FOUND:
- WARN("Session name %s not found", session_name);
+ usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
+ _MSG(".");
+ fflush(stdout);
+ }
+ } while (ret != 0);
+ }
+ 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_code = lttng_destroy_session_ext(session->name, &handle);
+ if (ret_code != LTTNG_OK) {
+ ret = -ret_code;
+ goto error;
+ }
+
+ if (opt_no_wait) {
+ goto skip_wait_rotation;
+ }
+
+ do {
+ status = lttng_destruction_handle_wait_for_completion(handle,
+ DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / USEC_PER_MSEC);
+ switch (status) {
+ case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
+ if (!printed_wait_msg) {
+ _MSG("Waiting for destruction of session \"%s\"",
+ session->name);
+ printed_wait_msg = true;
+ }
+ _MSG(".");
+ fflush(stdout);
break;
- default:
+ case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
break;
+ default:
+ ERR("Failed to wait for the completion of the destruction of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
}
+ } while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
+
+ status = lttng_destruction_handle_get_result(handle, &ret_code);
+ if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+ ERR("Failed to get the result of session destruction");
+ ret = -1;
goto error;
}
+ if (ret_code != LTTNG_OK) {
+ ret = -LTTNG_OK;
+ goto error;
+ }
+
+ status = lttng_destruction_handle_get_rotation_state(handle,
+ &rotation_state);
+ if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+ ERR("Failed to get rotation state from destruction handle");
+ goto skip_wait_rotation;
+ }
+ switch (rotation_state) {
+ case LTTNG_ROTATION_STATE_NO_ROTATION:
+ break;
+ case LTTNG_ROTATION_STATE_COMPLETED:
+ {
+ const struct lttng_trace_archive_location *location;
+
+ status = lttng_destruction_handle_get_archive_location(handle,
+ &location);
+ if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
+ if (printed_wait_msg) {
+ MSG("");
+ printed_wait_msg = false;
+ }
+ ret = print_trace_archive_location(location,
+ session->name);
+ if (ret) {
+ ERR("Failed to print the location of trace archive");
+ goto skip_wait_rotation;
+ }
+ break;
+ }
+ /* fall-through. */
+ }
+ default:
+ ERR("Failed to get the location of the rotation performed during the session's destruction");
+ goto skip_wait_rotation;
+ }
+skip_wait_rotation:
+ MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
+ session->name);
+ printed_wait_msg = false;
+
+ 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;
+ }
+ }
- MSG("Session %s destroyed", session_name);
- config_destroy_default();
ret = CMD_SUCCESS;
error:
+ if (printed_wait_msg) {
+ MSG("");
+ }
+ lttng_destruction_handle_destroy(handle);
+ free(session_name);
return ret;
}
*
* Call destroy_sessions for each registered sessions
*/
-static int destroy_all_sessions()
+static int destroy_all_sessions(struct lttng_session *sessions, int count)
{
- int count, i, ret = CMD_SUCCESS;
- struct lttng_session *sessions;
+ int i, ret = CMD_SUCCESS;
- count = lttng_list_sessions(&sessions);
if (count == 0) {
MSG("No session found, nothing to do.");
+ } else if (count < 0) {
+ ERR("%s", lttng_strerror(ret));
+ goto error;
}
+
for (i = 0; i < count; i++) {
- ret = destroy_session(sessions[i].name);
+ ret = destroy_session(&sessions[i]);
if (ret < 0) {
goto error;
}
return ret;
}
-/*
- * get_default_session_name
- *
- * Returns the default sessions name, if any
- */
-static int get_default_session_name(char **name)
-{
- char *session_name = get_session_name();
- if (session_name == NULL) {
- return CMD_ERROR;
- }
- *name = session_name;
- return CMD_SUCCESS;
-}
-
/*
* The 'destroy <options>' first level command
*/
int cmd_destroy(int argc, const char **argv)
{
int opt;
- int ret = CMD_SUCCESS;
+ int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
static poptContext pc;
char *session_name = NULL;
+ const char *leftover = NULL;
+
+ struct lttng_session *sessions;
+ int count;
+ int found;
pc = poptGetContext(NULL, argc, argv, long_options, 0);
poptReadDefaultConfig(pc, 0);
while ((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
case OPT_HELP:
- usage(stdout);
+ SHOW_HELP();
break;
case OPT_LIST_OPTIONS:
list_cmd_options(stdout, long_options);
break;
default:
- usage(stderr);
ret = CMD_UNDEFINED;
break;
}
goto end;
}
- session_name = (char *) poptGetArg(pc);
+ /* Mi preparation */
+ if (lttng_opt_mi) {
+ writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+ if (!writer) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ /* Open command element */
+ ret = mi_lttng_writer_command_open(writer,
+ mi_lttng_element_command_destroy);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
- /*
- * ignore session name in case all
- * sessions are to be destroyed
- */
+ /* Open output element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_command_output);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* For validation and semantic purpose we open a sessions element */
+ ret = mi_lttng_sessions_open(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+ /* Recuperate all sessions for further operation */
+ count = lttng_list_sessions(&sessions);
+ if (count < 0) {
+ ERR("%s", lttng_strerror(count));
+ command_ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+
+ /* Ignore session name in case all sessions are to be destroyed */
if (opt_destroy_all) {
- ret = destroy_all_sessions();
- goto end;
+ command_ret = destroy_all_sessions(sessions, count);
+ if (command_ret) {
+ success = 0;
+ }
+ } else {
+ opt_session_name = (char *) poptGetArg(pc);
+
+ if (!opt_session_name) {
+ /* No session name specified, lookup default */
+ session_name = get_session_name();
+ if (session_name == NULL) {
+ command_ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+ } else {
+ session_name = opt_session_name;
+ }
+
+ /* Find the corresponding lttng_session struct */
+ found = 0;
+ for (i = 0; i < count; i++) {
+ if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
+ found = 1;
+ command_ret = destroy_session(&sessions[i]);
+ if (command_ret) {
+ success = 0;
+ }
+
+ }
+ }
+
+ if (!found) {
+ ERR("Session name %s not found", session_name);
+ command_ret = LTTNG_ERR_SESS_NOT_FOUND;
+ success = 0;
+ goto mi_closing;
+ }
}
- if (session_name == NULL) {
- ret = get_default_session_name(&session_name);
- if (ret < 0 || session_name == NULL) {
+
+ leftover = poptGetArg(pc);
+ if (leftover) {
+ ERR("Unknown argument: %s", leftover);
+ ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+
+mi_closing:
+ /* Mi closing */
+ if (lttng_opt_mi) {
+ /* Close sessions and output element element */
+ ret = mi_lttng_close_multi_element(writer, 2);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_command_success, success);
+ if (ret) {
+ ret = CMD_ERROR;
goto end;
}
- }
- ret = destroy_session(session_name);
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
end:
- poptFreeContext(pc);
- if (session_name != NULL) {
+ /* Mi clean-up */
+ if (writer && mi_lttng_writer_destroy(writer)) {
+ /* Preserve original error code */
+ ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+ }
+
+ if (opt_session_name == NULL) {
free(session_name);
}
+
+ /* Overwrite ret if an error occurred during destroy_session/all */
+ ret = command_ret ? command_ret : ret;
+
+ poptFreeContext(pc);
return ret;
}
projects / lttng-tools.git / blobdiff