+/*
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/mi-lttng.h>
+
+#include "../command.h"
+
+
+static char *opt_session_name;
+static struct mi_writer *writer;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-start.1.h>
+;
+#endif
+
+enum {
+ OPT_HELP = 1,
+ OPT_LIST_OPTIONS,
+};
+
+static struct poptOption long_options[] = {
+ /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+ {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+ {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+
+static int mi_print_session(char *session_name, int enabled)
+{
+ int ret;
+
+ /* Open session element */
+ ret = mi_lttng_writer_open_element(writer, config_element_session);
+ if (ret) {
+ goto end;
+ }
+
+ /* Print session name element */
+ ret = mi_lttng_writer_write_element_string(writer, config_element_name,
+ session_name);
+ if (ret) {
+ goto end;
+ }
+
+ ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled,
+ enabled);
+ if (ret) {
+ goto end;
+ }
+
+ /* Close session element */
+ ret = mi_lttng_writer_close_element(writer);
+
+end:
+ return ret;
+}
+
+/*
+ * start_tracing
+ *
+ * Start tracing for all trace of the session.
+ */
+static int start_tracing(void)
+{
+ int ret;
+ char *session_name;
+
+ if (opt_session_name == NULL) {
+ session_name = get_session_name();
+ if (session_name == NULL) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ } else {
+ session_name = opt_session_name;
+ }
+
+ DBG("Starting tracing for session %s", session_name);
+
+ ret = lttng_start_tracing(session_name);
+ if (ret < 0) {
+ switch (-ret) {
+ case LTTNG_ERR_TRACE_ALREADY_STARTED:
+ WARN("Tracing already started for session %s", session_name);
+ break;
+ default:
+ ERR("%s", lttng_strerror(ret));
+ break;
+ }
+ goto free_name;
+ }
+
+ ret = CMD_SUCCESS;
+
+ MSG("Tracing started for session %s", session_name);
+ if (lttng_opt_mi) {
+ ret = mi_print_session(session_name, 1);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto free_name;
+ }
+ }
+
+free_name:
+ if (opt_session_name == NULL) {
+ free(session_name);
+ }
+error:
+ return ret;
+}
+
+/*
+ * cmd_start
+ *
+ * The 'start <options>' first level command
+ */
+int cmd_start(int argc, const char **argv)
+{
+ int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
+ static poptContext pc;
+ const char *leftover = NULL;
+
+ pc = poptGetContext(NULL, argc, argv, long_options, 0);
+ poptReadDefaultConfig(pc, 0);
+
+ while ((opt = poptGetNextOpt(pc)) != -1) {
+ switch (opt) {
+ case OPT_HELP:
+ SHOW_HELP();
+ goto end;
+ case OPT_LIST_OPTIONS:
+ list_cmd_options(stdout, long_options);
+ goto end;
+ default:
+ ret = CMD_UNDEFINED;
+ goto end;
+ }
+ }
+
+ opt_session_name = (char*) poptGetArg(pc);
+
+ leftover = poptGetArg(pc);
+ if (leftover) {
+ ERR("Unknown argument: %s", leftover);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Mi check */
+ 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_start);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Open output element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_command_output);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /*
+ * Open sessions element
+ * For validation purpose
+ */
+ ret = mi_lttng_writer_open_element(writer,
+ config_element_sessions);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+ command_ret = start_tracing();
+ if (command_ret) {
+ success = 0;
+ }
+
+ /* Mi closing */
+ if (lttng_opt_mi) {
+ /* Close sessions and output 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;
+ }
+
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+end:
+ /* Mi clean-up */
+ if (writer && mi_lttng_writer_destroy(writer)) {
+ /* Preserve original error code */
+ ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+ }
+
+ /* Overwrite ret if an error occurred with start_tracing */
+ ret = command_ret ? command_ret : ret;
+ poptFreeContext(pc);
+ return ret;
+}
projects / lttng-tools.git / blobdiff