X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fset_session.cpp;fp=src%2Fbin%2Flttng%2Fcommands%2Fset_session.cpp;h=fb42d14d5d5e5b931485383c71c291c52e30821e;hp=0000000000000000000000000000000000000000;hb=48a4000561343808724f7cb5fa8c131877489ccd;hpb=81663f073dbfb4b61c06a0ceb8ca33c4fc41b1c5

diff --git a/src/bin/lttng/commands/set_session.cpp b/src/bin/lttng/commands/set_session.cpp
new file mode 100644
index 000000000..fb42d14d5
--- /dev/null
+++ b/src/bin/lttng/commands/set_session.cpp
@@ -0,0 +1,244 @@
+/*
+ * 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/mi-lttng.h>
+
+#include "../command.h"
+
+static char *opt_session_name;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-set-session.1.h>
+;
+#endif
+
+enum {
+	OPT_HELP = 1,
+	OPT_LIST_OPTIONS,
+};
+
+static struct mi_writer *writer;
+
+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}
+};
+
+/*
+ * Print the necessary mi for a session and name.
+ */
+static int mi_print(char *session_name)
+{
+	int ret;
+
+	LTTNG_ASSERT(writer);
+	LTTNG_ASSERT(session_name);
+
+	/*
+	 * Open a sessions element
+	 * This is purely for validation purpose
+	 */
+	ret = mi_lttng_sessions_open(writer);
+	if (ret) {
+		goto end;
+	}
+
+	/* Open a session element */
+	ret = mi_lttng_writer_open_element(writer, config_element_session);
+	if (ret) {
+		goto end;
+	}
+
+	/* Session name */
+	ret = mi_lttng_writer_write_element_string(writer , config_element_name,
+			session_name);
+	if (ret) {
+		goto end;
+	}
+
+	/* Close session and sessions element */
+	ret = mi_lttng_close_multi_element(writer, 2);
+	if (ret) {
+		goto end;
+	}
+end:
+	return ret;
+}
+
+/*
+ *  set_session
+ */
+static int set_session(void)
+{
+	int ret = CMD_SUCCESS;
+	int count, i;
+	unsigned int session_found = 0;
+	struct lttng_session *sessions;
+
+	if (opt_session_name && strlen(opt_session_name) > NAME_MAX) {
+		ERR("Session name too long. Length must be lower or equal to %d",
+			NAME_MAX);
+		ret = CMD_ERROR;
+		goto end;
+	}
+
+	count = lttng_list_sessions(&sessions);
+	if (count < 0) {
+		ret = CMD_ERROR;
+		ERR("%s", lttng_strerror(count));
+		goto end;
+	}
+
+	for (i = 0; i < count; i++) {
+		if (strncmp(sessions[i].name, opt_session_name, NAME_MAX) == 0) {
+			session_found = 1;
+			break;
+		}
+	}
+
+	if (!session_found) {
+		ERR("Session '%s' not found", opt_session_name);
+		ret = CMD_ERROR;
+		goto error;
+	}
+
+	ret = config_init(opt_session_name);
+	if (ret < 0) {
+		ERR("Unable to set session name");
+		ret = CMD_ERROR;
+		goto error;
+	}
+
+	MSG("Session set to %s", opt_session_name);
+	if (lttng_opt_mi) {
+		ret = mi_print(opt_session_name);
+		if (ret) {
+			ret = CMD_ERROR;
+			goto error;
+		}
+	}
+
+	ret = CMD_SUCCESS;
+
+error:
+	free(sessions);
+end:
+	return ret;
+}
+
+/*
+ *  cmd_set_session
+ */
+int cmd_set_session(int argc, const char **argv)
+{
+	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
+	static poptContext pc;
+
+	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);
+	if (opt_session_name == NULL) {
+		ERR("Missing session name");
+		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_set_session);
+		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;
+		}
+	}
+
+	command_ret = set_session();
+	if (command_ret) {
+		success = 0;
+	}
+
+	/* Mi closing */
+	if (lttng_opt_mi) {
+		/* 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:
+	/* 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 during set_session() */
+	ret = command_ret ? command_ret : ret;
+
+	poptFreeContext(pc);
+	return ret;
+}