src/monitor/MarshalWrapper.cpp

   1 /** Aesalon, a tool to visualize program behaviour in real time.
   2         Copyright (C) 2009-2011, Aesalon development team.
   3
   4         Aesalon is distributed under the terms of the GNU GPLv3. See
   5         the included file LICENSE for more information.
   6
   7         @file src/monitor/MarshalWrapper.cpp
   8 */
   9
  10 #include <dlfcn.h>
  11
  12 #include "monitor/MarshalWrapper.h"
  13 #include "config/GlobalVault.h"
  14 #include "util/MessageSystem.h"
  15
  16 namespace Monitor {
  17
  18 MarshalWrapper::MarshalWrapper(const std::string &moduleName) : m_interface(NULL), m_handle(NULL) {
  19         load(moduleName);
  20 }
  21
  22 MarshalWrapper::MarshalWrapper(Marshal::Interface *interface) : m_interface(interface) {
  23
  24 }
  25
  26 MarshalWrapper::~MarshalWrapper() {
  27
  28 }
  29
  30 void MarshalWrapper::load(const std::string &moduleName) {
  31         std::string moduleRoot = Config::GlobalVault::instance()->get(moduleName + ":root");
  32         std::string marshalPath = Config::GlobalVault::instance()->get(moduleName + ":marshalPath");
  33
  34         /* Use RTLD_NOW so if there are any undefined symbols, they are caught now instead of later. */
  35         m_handle = dlopen((moduleRoot + marshalPath).c_str(), RTLD_NOW | RTLD_LOCAL);
  36         if(m_handle == NULL) {
  37                 Message(Warning, "Could not open marshal library for module \"" << moduleName << "\":" << dlerror());
  38                 return;
  39         }
  40         Marshal::Interface *(*instantiate)();
  41
  42         *(void **) (&instantiate) = dlsym(m_handle, "AM_Instantiate");
  43
  44         if(instantiate == NULL) {
  45                 Message(Warning, "Could not find AM_Instantiate in " << moduleName << "'s marshal.");
  46                 return;
  47         }
  48
  49         m_interface = instantiate();
  50 }
  51
  52 } // namespace Monitor