src/LoadableModule.h

   1 /*
   2  * Copyright (C) 1996-2019 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_LOADABLE_MODULE_H
  10 #define SQUID_LOADABLE_MODULE_H
  11
  12 #include "SquidString.h"
  13
  14 // wrapper for dlopen(3), libltdl, and friends
  15 class LoadableModule
  16 {
  17 public:
  18     enum LoadMode { lmNow, lmLazy };
  19
  20 public:
  21     LoadableModule(const String &aName);
  22     ~LoadableModule();           // unloads if loaded
  23
  24     bool loaded() const;
  25     const String &name() const { return theName; }
  26     const String &error() const { return theError; }
  27
  28     void load(int mode = lmNow); // throws Texc
  29     void unload(); // throws Texc
  30
  31 protected:
  32     String theName;
  33     String theError;
  34     void *theHandle;
  35
  36 private:
  37     void *openModule(int mode);
  38     bool closeModule();
  39     const char *errorMsg();
  40 };
  41
  42 #endif
  43