X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fstart.cpp;fp=src%2Fbin%2Flttng%2Fcommands%2Fstart.cpp;h=7082e097dfa5a3dcc9f9f7b384d7bfbbd90b2ea2;hp=0000000000000000000000000000000000000000;hb=48a4000561343808724f7cb5fa8c131877489ccd;hpb=81663f073dbfb4b61c06a0ceb8ca33c4fc41b1c5

diff --git a/src/bin/lttng/commands/start.cpp b/src/bin/lttng/commands/start.cpp
new file mode 100644
index 000000000..7082e097d
--- /dev/null
+++ b/src/bin/lttng/commands/start.cpp
@@ -0,0 +1,242 @@
+/*
+ * 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;
+}