lttng/utils.c

   1 /*
   2  * Copyright (c)  2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdlib.h>
  20
  21 #include <lttng/lttng.h>
  22
  23 #include "conf.h"
  24
  25 /*
  26  *  get_config_file_path
  27  *
  28  *  Return absolute path to the configuration file.
  29  */
  30 char *get_config_file_path(void)
  31 {
  32         char *alloc_path, *path = NULL;
  33
  34         /* Get path to config directory */
  35         alloc_path = config_get_default_path();
  36         if (alloc_path == NULL) {
  37                 goto error;
  38         }
  39
  40         /* Get path to config file */
  41         path = config_generate_dir_path(alloc_path);
  42         if (path == NULL) {
  43                 goto free_alloc_path;
  44         }
  45
  46 free_alloc_path:
  47         free(alloc_path);
  48 error:
  49         return path;
  50 }
  51
  52 /*
  53  *  get_session_name
  54  *
  55  *  Return allocated string with the session name found in the config
  56  *  directory.
  57  */
  58 char *get_session_name(void)
  59 {
  60         char *path, *session_name = NULL;
  61
  62         /* Get path to config file */
  63         path = get_config_file_path();
  64         if (path == NULL) {
  65                 goto error;
  66         }
  67
  68         /* Get session name from config */
  69         session_name = config_read_session_name(path);
  70         if (session_name == NULL) {
  71                 goto free_path;
  72         }
  73
  74 free_path:
  75         free(path);
  76 error:
  77         return session_name;
  78 }
  79
  80 /*
  81  *  set_session_name
  82  *
  83  *  Get session name and set it for the lttng control lib.
  84  */
  85 int set_session_name(void)
  86 {
  87         int ret;
  88         char *session_name;
  89
  90         session_name = get_session_name();
  91         if (session_name == NULL) {
  92                 ret = -1;
  93                 goto error;
  94         }
  95
  96         lttng_set_session_name(session_name);
  97         free(session_name);
  98
  99         ret = 0;
 100
 101 error:
 102         return ret;
 103 }