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Library.cpp

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#include "OSDependent/Library.h"
#include "OSDependent/OS.h"

#define DLL_PREFIX "lib"
#define DLL_SUFFIX ".so"

Library::Library() :
_handle(NULL)
{
}

Library::~Library()
{
  unload();
}

/*
 * Load a library.
 *
 * Return -1 on failure, 0 on success.
 */
int 
Library::load(const char *libName, int mode)
{
  _handle = ::dlopen(libName, mode);

  char fullName[MAXNAMELEN];
  
  if (_handle == NULL){
    // Try once more adding the standard DLL prefix and suffix for this platform.
    getNativeLibName(libName, fullName);
    
    _handle = ::dlopen (fullName, mode);
    if (_handle == NULL)
      return -1;
  }
  return 0;
}

/*
 * Unload the previously loaded library.
 *
 * Return -1 on failure, 0 on success.
 */
int 
Library::unload()
{
  if (_handle == NULL)
    return -1;
  if (::dlclose(_handle) == 0) {
    _handle = NULL;
    return 0;
  }
  return -1;
}

/*
 * Get a pointer to a function from this library.
 *
 * Returns function address on success (caller must
 * cast to correct function signature), NULL on failure.
 */
void *
Library::getFuncPtr(const char *funcName) const
{
  if (_handle == NULL)
    return NULL;
  return ::dlsym(_handle, funcName);
}

/*
 * Add the standard dynamic library prefix and suffix for this platform.
 * Returns the string containing the native library name.
 */
void
Library::getNativeLibName (const char *genericName, char *nativeName)
{
  char temp [MAXNAMELEN];
  
  strcpy(temp, genericName);
  // strrchr returns a pointer to the last occurrence of a char in a string.
  char *filename = strrchr(temp, OS::DirectorySeparator);
  if (filename != NULL) {
    // It's a compound pathname
    *filename = '\0';
    filename++;
    sprintf (nativeName, "%s%c%s%s%s", temp, OS::DirectorySeparator, DLL_PREFIX,
             filename, DLL_SUFFIX);
    // Note that the method we use inside this if statement does not look into
    // the LD_LIBRARY_PATH, it only looks at the current directory.
    // To do that, we'd need somthing like the complicated ACE::ldfind() in ace/ACE.cpp.
  } else {
    // It's not compound pathname, simply add prefix and suffix.
    sprintf (nativeName, "%s%s%s", DLL_PREFIX, genericName, DLL_SUFFIX);
  }
}

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