+static
+int mi_open(void)
+{
+ int ret;
+
+ /* MI check */
+ if (!lttng_opt_mi) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = fileno(stdout);
+ if (ret < 0) {
+ PERROR("Unable to retrieve fileno of stdout");
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ writer = mi_lttng_writer_create(ret, lttng_opt_mi);
+ if (!writer) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Open command element */
+ ret = mi_lttng_writer_command_open(writer,
+ mi_lttng_element_command_add_context);
+ 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;
+ }
+end:
+ return ret;
+}
+
+static
+int mi_close(enum cmd_error_code success)
+{
+ int ret;
+
+ /* MI closing */
+ if (!lttng_opt_mi) {
+ ret = 0;
+ goto end;
+ }
+ /* Close output element */
+ ret = mi_lttng_writer_close_element(writer);
+ 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:
+ return ret;
+}
+
+static
+void populate_context(struct lttng_event_context *context,
+ const struct ctx_opts *opt)
+{
+ char *ptr;
+
+ context->ctx = (enum lttng_event_context_type) opt->ctx_type;
+ switch (context->ctx) {
+ case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
+ case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
+ context->u.perf_counter.type = opt->u.perf.type;
+ context->u.perf_counter.config = opt->u.perf.config;
+ strncpy(context->u.perf_counter.name, opt->symbol,
+ LTTNG_SYMBOL_NAME_LEN);
+ context->u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
+ /* Replace : and - by _ */
+ while ((ptr = strchr(context->u.perf_counter.name, '-')) != NULL) {
+ *ptr = '_';
+ }
+ while ((ptr = strchr(context->u.perf_counter.name, ':')) != NULL) {
+ *ptr = '_';
+ }
+ break;
+ case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
+ context->u.app_ctx.provider_name =
+ opt->u.app_ctx.provider_name;
+ context->u.app_ctx.ctx_name =
+ opt->u.app_ctx.ctx_name;
+ break;
+ default:
+ break;
+ }
+}
+
+/*
+ * Pretty print context type.
+ */
+static
+int print_ctx_type(void)
+{
+
+ FILE *ofp = stdout;
+ int i = 0;
+ int ret;
+ struct lttng_event_context context;
+
+ memset(&context, 0, sizeof(context));
+
+ ret = mi_open();
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (lttng_opt_mi) {
+ /* Open a contexts element */
+ ret = mi_lttng_writer_open_element(writer, config_element_contexts);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+ while (ctx_opts[i].symbol != NULL) {
+ if (!ctx_opts[i].hide_help) {
+ if (lttng_opt_mi) {
+ populate_context(&context, &ctx_opts[i]);
+ ret = mi_lttng_context(writer, &context, 1);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ ret = mi_lttng_writer_write_element_string(
+ writer,
+ mi_lttng_element_context_symbol,
+ ctx_opts[i].symbol);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ } else {
+ fprintf(ofp, "%s\n", ctx_opts[i].symbol);
+ }
+ }
+ i++;
+ }
+
+ if (lttng_opt_mi) {
+ /* Close contexts element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto end;
+ }
+ }
+
+end:
+ ret = mi_close(ret);
+ if (ret) {
+ ret = CMD_ERROR;
+ }
+ return ret;
+}
+