src/bin/lttng-sessiond/load-session-thread.c

   1 /*
   2  * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <common/error.h>
  20 #include <common/config/session-config.h>
  21
  22 #include "load-session-thread.h"
  23 #include "lttng-sessiond.h"
  24
  25 /*
  26  * Destroy the thread data previously created with the init function.
  27  */
  28 void load_session_destroy_data(struct load_session_thread_data *data)
  29 {
  30         if (!data) {
  31                 return;
  32         }
  33 }
  34
  35 /*
  36  * Initialize the thread data. This MUST be called before the thread load
  37  * session is created.
  38  *
  39  * Return 0 on success else a negative value. Note that the destroy function
  40  * can be called with no or partially initialized data.
  41  */
  42 int load_session_init_data(struct load_session_thread_data **data)
  43 {
  44         struct load_session_thread_data *_data = NULL;
  45
  46         assert(data);
  47
  48         /*
  49          * Allocate memory here since this function is called from the main thread
  50          * can die *before* the end of the load session thread.
  51          */
  52         _data = zmalloc(sizeof(*_data));
  53         if (!_data) {
  54                 PERROR("zmalloc load session info");
  55                 goto error;
  56         }
  57
  58         *data = _data;
  59         return 0;
  60
  61 error:
  62         free(_data);
  63         return -1;
  64 }
  65
  66 /*
  67  * This thread loads session configurations once the session daemon is
  68  * ready to process client messages.
  69  */
  70 void *thread_load_session(void *data)
  71 {
  72         int ret;
  73         struct load_session_thread_data *info = data;
  74
  75         DBG("[load-session-thread] Load session");
  76
  77         /* Override existing session and autoload also. */
  78         ret = config_load_session(info->path, NULL, 1, 1, NULL);
  79         if (ret) {
  80                 ERR("Session load failed: %s", error_get_str(ret));
  81         }
  82
  83         sessiond_signal_parents();
  84         return NULL;
  85 }