src/LoadableModule.h

   1 /*
   2  * Copyright (C) 1996-2023 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     LoadableModule(const String &aName);
  19     ~LoadableModule();           // unloads if loaded
  20
  21     bool loaded() const;
  22     const String &name() const { return theName; }
  23     const String &error() const { return theError; }
  24
  25     void load(); // throws Texc
  26     void unload(); // throws Texc
  27
  28 protected:
  29     String theName;
  30     String theError;
  31     void *theHandle;
  32
  33 private:
  34     void *openModule();
  35     bool closeModule();
  36     const char *errorMsg();
  37 };
  38
  39 #endif
  40