bin: compile lttng as C++

[lttng-tools.git] / src / bin / lttng / commands / set_session.cpp

diff --git a/src/bin/lttng/commands/set_session.cpp b/src/bin/lttng/commands/set_session.cpp
new file mode 100644 (file)
index 0000000..fb42d14
--- /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;
+}